v3.0.0-rc1

.clang-format

@@ -0,0 +1,94 @@
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+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+#AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: false
+BinPackParameters: false
+BraceWrapping:   
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+  AfterControlStatement: true
+  AfterEnum:       true
+  AfterFunction:   true
+  AfterNamespace:  true
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+  AfterUnion:      true
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+  BeforeElse:      true
+  IndentBraces:    false
+#  SplitEmptyFunction: true
+#  SplitEmptyRecord: true
+#  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+#BreakConstructorInitializers: AfterColon
+BreakConstructorInitializersBeforeComma: false
+BreakStringLiterals: true
+ColumnLimit:     100
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+ForEachMacros:   [ foreach ]
+IncludeCategories: 
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+  - Regex:           '^(<|"(gtest|isl|json)/)'
+    Priority:        3
+  - Regex:           '.*'
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+IncludeIsMainRegex: '$'
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+IndentWidth:     4
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+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Right
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+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: Always
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
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+Standard:        Cpp11
+TabWidth:        4
+UseTab:          ForIndentation
+...
+

.gitignore

@@ -9,5 +9,9 @@
 *.nso
 *.pfs0
 *.smdh
+.gdb_history
 build.*/
 ftpd
+romfs.3ds/*.t3x
+romfs.switch/*.zst
+romfs.switch/shaders/*.dksh

LICENSE

@@ -1,25 +1,674 @@
-This is free and unencumbered software released into the public domain.
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Anyone is free to copy, modify, publish, use, compile, sell, or
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+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -1,42 +1,79 @@
-.PHONY: all nro 3dsx cia clean linux
+.PHONY: all nro 3dsx cia clean linux 3dslink nxlink format release release-3dsx release-cia release-3ds release-nro
+
+TARGET := $(notdir $(CURDIR))
 
 export GITREV  := $(shell git rev-parse HEAD 2>/dev/null | cut -c1-8)
-export VERSION_MAJOR := 2
+export VERSION_MAJOR := 3
-export VERSION_MINOR := 3
+export VERSION_MINOR := 0
-export VERSION_MICRO := 1
+export VERSION_MICRO := 0
-export VERSION := $(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_MICRO)
+export VERSION := $(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_MICRO)-rc1
 
 ifneq ($(strip $(GITREV)),)
 export VERSION := $(VERSION)-$(GITREV)
 endif
 
-all:
+all: 3dsx nro linux
-	@echo please choose 3dsx, cia, linux, or nro
 
-release:
+nxlink:
-	# can't let these three run in parallel with each other due to using same
+	@$(MAKE) -f Makefile.switch nxlink
-	# ftpd.elf file name
+
-	@$(MAKE) -f Makefile.switch all
+3dslink: 3dsx
-	@$(MAKE) -f Makefile.3ds 3dsx
+	@/opt/devkitpro/tools/bin/3dslink $(TARGET)-3ds.3dsx
-	@$(MAKE) -f Makefile.3ds cia
+
-	@xz -c <ftpd.3dsx >ftpd.3dsx.xz
+format:
-	@xz -c <ftpd.cia >ftpd.cia.xz
+	@clang-format -style=file -i $(filter-out \
-	@xz -c <ftpd.nro >ftpd.nro.xz
+		include/imgui.h \
+		source/pc/imgui_impl_glfw.cpp \
+		source/pc/imgui_impl_glfw.h \
+		source/pc/imgui_impl_opengl3.cpp \
+		source/pc/imgui_impl_opengl3.h \
+		source/pc/KHR/khrplatform.h \
+		source/pc/glad.c \
+		source/pc/glad/glad.h \
+		source/imgui/imgui.cpp \
+		source/imgui/imgui_demo.cpp \
+		source/imgui/imgui_draw.cpp \
+		source/imgui/imgui_widgets.cpp \
+		source/imgui/imstb_rectpack.h \
+		source/imgui/imstb_textedit.h \
+		source/imgui/imstb_truetype.h \
+		source/imgui/imgui_internal.h, \
+		$(shell find source include -type f -name \*.c -o -name \*.cpp -o -name \*.h))
+
+release: release-3ds release-nro
+	@xz -c <$(TARGET)-3ds.3dsx >ftpd.3dsx.xz
+	@echo xz -c <$(TARGET)-3ds.cia >ftpd.cia.xz
+	@echo xz -c <$(TARGET)-nx.nro >ftpd.nro.xz
 
 nro:
 	@$(MAKE) -f Makefile.switch all
 
+release-nro:
+	@$(MAKE) DEFINES=-DNDEBUG -f Makefile.switch all
+
 3dsx:
 	@$(MAKE) -f Makefile.3ds 3dsx
 
-cia:
+release-3dsx:
+	@$(MAKE) DEFINES=-DNDEBUG -f Makefile.3ds 3dsx
+
+cia: 3dsx
 	@$(MAKE) -f Makefile.3ds cia
 
+release-cia: release-3dsx
+	@$(MAKE) DEFINES=-NDEBUG -f Makefile.3ds cia
+
+release-3ds:
+	# can't let these three run in parallel with each other due to using same
+	# .elf file name
+	@$(MAKE) DEFINES=-DNDEBUG -f Makefile.3ds 3dsx
+	@$(MAKE) DEFINES=-DNDEBUG -f Makefile.3ds cia
+
 linux:
 	@$(MAKE) -f Makefile.linux
 
 clean:
-	@$(MAKE) -f Makefile.switch   clean
+	@$(MAKE) -f Makefile.switch clean
-	@$(MAKE) -f Makefile.3ds   clean
+	@$(MAKE) -f Makefile.3ds clean
 	@$(MAKE) -f Makefile.linux clean
 	@$(RM) ftpd.3dsx.xz	ftpd.cia.xz	ftpd.nro.xz

Makefile.3ds

@@ -15,6 +15,10 @@ include $(DEVKITARM)/3ds_rules
 # SOURCES is a list of directories containing source code
 # DATA is a list of directories containing data files
 # INCLUDES is a list of directories containing header files
+# GRAPHICS is a list of directories containing graphics files
+# GFXBUILD is the directory where converted graphics files will be placed
+#   If set to $(BUILD), it will statically link in the converted
+#   files as if they were data files.
 #
 # NO_SMDH: if set to anything, no SMDH file is generated.
 # ROMFS is the directory which contains the RomFS, relative to the Makefile (Optional)
@@ -27,14 +31,16 @@ include $(DEVKITARM)/3ds_rules
 #     - icon.png
 #     - <libctru folder>/default_icon.png
 #---------------------------------------------------------------------------------
-TARGET   := ftpd
+TARGET   := $(notdir $(CURDIR))-3ds
 BUILD    := build.3ds
-SOURCES  := source
+SOURCES  := source source/3ds source/imgui
 DATA     := data
 INCLUDES := include
-ROMFS    :=
+GRAPHICS := gfx.3ds
+ROMFS    := romfs.3ds
+GFXBUILD := $(ROMFS)
 
-APP_TITLE       := ftpd snap!
+APP_TITLE       := ftpd
 APP_DESCRIPTION := v$(VERSION)
 APP_AUTHOR      := mtheall
 
@@ -46,21 +52,23 @@ RSF_FILE        := meta/ftpd-cia.rsf
 #---------------------------------------------------------------------------------
 # options for code generation
 #---------------------------------------------------------------------------------
+OPTIMIZE := -O2
 ARCH     := -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft
 
-CFLAGS   := -g -Wall -O3 -mword-relocations \
+CFLAGS   := -g -Wall $(OPTIMIZE) -mword-relocations \
-            -fomit-frame-pointer -ffunction-sections \
+            -fomit-frame-pointer -ffunction-sections -fdata-sections \
-            $(ARCH) \
+            $(ARCH) $(DEFINES)
-            -DSTATUS_STRING="\"ftpd v$(VERSION)\""
 
-CFLAGS   +=  $(INCLUDE) -DARM11 -D_3DS
+CFLAGS   +=  $(INCLUDE) -DARM11 -D_3DS \
+            -DSTATUS_STRING="\"ftpd v$(VERSION)\"" \
+            -DIMGUI_DISABLE_INCLUDE_IMCONFIG_H=1
 
-CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
+CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++17
 
 ASFLAGS  := -g $(ARCH)
-LDFLAGS   = -specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(TARGET).map
+LDFLAGS   = -specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(TARGET).map $(OPTIMIZE)
 
-LIBS     := -lctru -lm
+LIBS     := -lcitro3d -lctru -lm
 
 #---------------------------------------------------------------------------------
 # list of directories containing libraries, this must be the top level containing
@@ -80,14 +88,18 @@ export OUTPUT  :=  $(CURDIR)/$(TARGET)
 export TOPDIR  :=  $(CURDIR)
 
 export VPATH   :=  $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+                   $(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir)) \
                    $(foreach dir,$(DATA),$(CURDIR)/$(dir))
 
 export DEPSDIR :=  $(CURDIR)/$(BUILD)
 
-CFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CFILES      := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
-CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+CPPFILES    := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
-SFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+SFILES      := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
-BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+PICAFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.v.pica)))
+SHLISTFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.shlist)))
+GFXFILES    := $(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.t3s)))
+BINFILES    := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
 
 #---------------------------------------------------------------------------------
 # use CXX for linking C++ projects, CC for standard C
@@ -99,16 +111,38 @@ else
 endif
 #---------------------------------------------------------------------------------
 
-export OFILES   := $(addsuffix .o,$(BINFILES)) \
+#---------------------------------------------------------------------------------
-                   $(CPPFILES:.cpp=.o) \
+ifeq ($(GFXBUILD),$(BUILD))
-                   $(CFILES:.c=.o) \
+#---------------------------------------------------------------------------------
-                   $(SFILES:.s=.o)
+export T3XFILES :=  $(GFXFILES:.t3s=.t3x)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+export ROMFS_T3XFILES := $(patsubst %.t3s,$(GFXBUILD)/%.t3x,$(GFXFILES))
+export T3XHFILES      := $(patsubst %.t3s,$(BUILD)/%.h,$(GFXFILES))
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
 
-export INCLUDE  := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
-                   $(foreach dir,$(LIBDIRS),-I$(dir)/include) \
-                   -I$(CURDIR)/$(BUILD)
 
-export LIBPATHS :=  $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+export OFILES_BIN     := $(addsuffix .o,$(BINFILES)) \
+                         $(PICAFILES:.v.pica=.shbin.o) $(SHLISTFILES:.shlist=.shbin.o) \
+                         $(addsuffix .o,$(T3XFILES))
+
+export OFILES    := $(OFILES_BIN) $(OFILES_SOURCES)
+
+export HFILES    := $(PICAFILES:.v.pica=_shbin.h) $(SHLISTFILES:.shlist=_shbin.h) \
+                    $(addsuffix .h,$(subst .,_,$(BINFILES))) \
+                    $(GFXFILES:.t3s=.h)
+
+export INCLUDE   := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+                    $(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+                    -I$(CURDIR)/$(BUILD)
+
+export LIBPATHS  :=  $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+export _3DSXDEPS := $(if $(NO_SMDH),,$(OUTPUT).smdh)
 
 ifeq ($(strip $(ICON)),)
   icons := $(wildcard *.png)
@@ -131,36 +165,54 @@ ifneq ($(ROMFS),)
   export _3DSXFLAGS += --romfs=$(CURDIR)/$(ROMFS)
 endif
 
-.PHONY: $(BUILD) clean all
+.PHONY: $(BUILD) clean all 3dsx cia
 
 #---------------------------------------------------------------------------------
-all: $(BUILD)
+all: $(BUILD) $(GFXBUILD) $(DEPSDIR) $(ROMFS_T3XFILES) $(T3XHFILES)
 	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.3ds
 
-3dsx: $(BUILD)
+$(BUILD):
+	@mkdir -p $@
+
+ifneq ($(GFXBUILD),$(BUILD))
+$(GFXBUILD):
+	@mkdir -p $@
+endif
+
+ifneq ($(DEPSDIR),$(BUILD))
+$(DEPSDIR):
+	mkdir -p $@
+endif
+
+#---------------------------------------------------------------------------------
+$(GFXBUILD)/%.t3x $(BUILD)/%.h: %.t3s
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	tex3ds -i $< -H $(BUILD)/$*.h -d $(DEPSDIR)/$*.d -o $(GFXBUILD)/$*.t3x
+
+3dsx: $(BUILD) $(GFXBUILD) $(DEPSDIR) $(ROMFS_T3XFILES) $(T3XHFILES)
 	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.3ds 3dsx
 
-cia: $(BUILD)
+cia: $(BUILD) $(GFXBUILD) $(DEPSDIR) $(ROMFS_T3XFILES) $(T3XHFILES)
 	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.3ds cia
 
-$(BUILD):
-	@[ -d $@ ] || mkdir -p $@
-
 #---------------------------------------------------------------------------------
 clean:
 	@echo clean ...
-	@$(RM) -r $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf $(TARGET).cia output/
+	@$(RM) -r $(BUILD) \
-
+		$(TARGET).3dsx \
+		$(OUTPUT).smdh \
+		$(TARGET).elf \
+		$(TARGET).cia \
+		$(ROMFS_T3XFILES) \
+		output/ 
 
 #---------------------------------------------------------------------------------
 else
-
-DEPENDS := $(OFILES:.o=.d)
-
 #---------------------------------------------------------------------------------
 # main targets
 #---------------------------------------------------------------------------------
-#all: $(OUTPUT).cia $(OUTPUT).3dsx
+all: $(OUTPUT).cia $(OUTPUT).3dsx
 
 3dsx: $(OUTPUT).3dsx
 
@@ -173,11 +225,56 @@ $(OUTPUT).smdh: $(TOPDIR)/Makefile $(TOPDIR)/Makefile.3ds
 $(OUTPUT).3dsx: $(OUTPUT).smdh
 endif
 
-$(OUTPUT).3dsx: $(OUTPUT).elf
+$(OUTPUT).3dsx: $(OUTPUT).elf $(_3DSXDEPS)
+
+$(OFILES_SOURCES): $(HFILES)
+
 $(OUTPUT).elf:  $(OFILES)
 
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o %_bin.h: %.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
 $(OFILES): $(TOPDIR)/Makefile $(TOPDIR)/Makefile.3ds
 
+#---------------------------------------------------------------------------------
+.PRECIOUS: %.t3x
+#---------------------------------------------------------------------------------
+%.t3x.o %_t3x.h: %.t3x
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+#---------------------------------------------------------------------------------
+# rules for assembling GPU shaders
+#---------------------------------------------------------------------------------
+define shader-as
+	$(eval CURBIN := $*.shbin)
+	$(eval DEPSFILE := $(DEPSDIR)/$*.shbin.d)
+	echo "$(CURBIN).o: $< $1" > $(DEPSFILE)
+	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(CURBIN) | tr . _)`.h
+	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(CURBIN) | tr . _)`.h
+	echo "extern const u32" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(CURBIN) | tr . _)`.h
+	picasso -o $(CURBIN) $1
+	bin2s $(CURBIN) | $(AS) -o $*.shbin.o
+endef
+
+%.shbin.o %_shbin.h : %.v.pica %.g.pica
+	@echo $(notdir $^)
+	@$(call shader-as,$^)
+
+%.shbin.o %_shbin.h : %.v.pica
+	@echo $(notdir $<)
+	@$(call shader-as,$<)
+
+%.shbin.o %_shbin.h : %.shlist
+	@echo $(notdir $<)
+	@$(call shader-as,$(foreach file,$(shell cat $<),$(dir $<)$(file)))
+
 $(OUTPUT).cia:  $(OUTPUT).elf $(OUTPUT).smdh $(TARGET).bnr $(TOPDIR)/$(RSF_FILE)
 	@makerom -f cia -target t -exefslogo -o $@ \
 	  -elf $(OUTPUT).elf -rsf $(TOPDIR)/$(RSF_FILE) \
@@ -190,15 +287,8 @@ $(TARGET).bnr:  $(TOPDIR)/$(BNR_IMAGE) $(TOPDIR)/$(BNR_AUDIO)
 	@bannertool makebanner -o $@ -i $(TOPDIR)/$(BNR_IMAGE) -a $(TOPDIR)/$(BNR_AUDIO)
 	@echo "built ... $@"
 
-#---------------------------------------------------------------------------------
-# you need a rule like this for each extension you use as binary data
-#---------------------------------------------------------------------------------
-%.bin.o: %.bin
-#---------------------------------------------------------------------------------
-	@echo $(notdir $<)
-	@$(bin2o)
 
--include $(DEPENDS)
+-include $(DEPSDIR)/*.d
 
 #---------------------------------------------------------------------------------------
 endif

Makefile.linux

@@ -1,23 +1,36 @@
 TARGET  := ftpd
+BUILD   := build.linux
 
-CFILES  := $(wildcard source/*.c)
+CFILES    := $(wildcard source/pc/*.c)
-OFILES  := $(patsubst source/%,build.linux/%,$(CFILES:.c=.o))
+OFILES    := $(patsubst source/%,$(BUILD)/%,$(CFILES:.c=.c.o))
+CXXFILES  := $(wildcard source/*.cpp source/imgui/*.cpp source/pc/*.cpp)
+OXXFILES  := $(patsubst source/%,$(BUILD)/%,$(CXXFILES:.cpp=.cpp.o))
 
-CFLAGS  := -g -Wall -Iinclude -DSTATUS_STRING="\"ftpd v$(VERSION)\""
+CPPFLAGS  := -g -Wall -pthread -Iinclude -Isource/pc \
-LDFLAGS :=
+             `pkg-config --cflags gl glfw3` \
+             -DSTATUS_STRING="\"ftpd v$(VERSION)\"" \
+             -DIMGUI_DISABLE_INCLUDE_IMCONFIG_H=1 \
+             -DIMGUI_IMPL_OPENGL_LOADER_GLAD=1
+CFLAGS    := $(CPPFLAGS)
+CXXFLAGS  := $(CPPFLAGS) -std=gnu++17
+LDFLAGS   := -pthread `pkg-config --libs gl glfw3` -ldl
 
 .PHONY: all clean
 
-all: build.linux $(TARGET)
+all: $(TARGET)
 
-build.linux:
+$(TARGET): $(OFILES) $(OXXFILES)
-	@mkdir build.linux/
+	$(CXX) -o $@ $^ $(LDFLAGS)
 
-$(TARGET): $(OFILES)
+$(OFILES): $(BUILD)/%.c.o : source/%.c
-	@$(CC) -o $@ $^ $(LDFLAGS)
+	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
+	$(CC) -MMD -MP -MF $(BUILD)/$*.c.d $(CFLAGS) -c $< -o $@
 
-$(OFILES): build.linux/%.o : source/%.c
+$(OXXFILES): $(BUILD)/%.cpp.o : source/%.cpp
-	@$(CC) -o $@ -c $< $(CFLAGS)
+	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
+	$(CXX) -MMD -MP -MF $(BUILD)/$*.c.d $(CXXFLAGS) -c $< -o $@
 
 clean:
-	@$(RM) -r build.linux/ $(TARGET)
+	@$(RM) -r $(BUILD) $(TARGET)
+
+-include $(shell find $(BUILD) -name \*.d 2>/dev/null)

Makefile.switch

@@ -15,7 +15,7 @@ include $(DEVKITPRO)/libnx/switch_rules
 # SOURCES is a list of directories containing source code
 # DATA is a list of directories containing data files
 # INCLUDES is a list of directories containing header files
-# EXEFS_SRC is the optional input directory containing data copied into exefs, if anything this normally should only contain "main.npdm".
+# ROMFS is the directory containing data to be added to RomFS, relative to the Makefile (Optional)
 #
 # NO_ICON: if set to anything, do not use icon.
 # NO_NACP: if set to anything, no .nacp file is generated.
@@ -28,36 +28,51 @@ include $(DEVKITPRO)/libnx/switch_rules
 #     - <Project name>.jpg
 #     - icon.jpg
 #     - <libnx folder>/default_icon.jpg
+#
+# CONFIG_JSON is the filename of the NPDM config file (.json), relative to the project folder.
+#   If not set, it attempts to use one of the following (in this order):
+#     - <Project name>.json
+#     - config.json
+#   If a JSON file is provided or autodetected, an ExeFS PFS0 (.nsp) is built instead
+#   of a homebrew executable (.nro). This is intended to be used for sysmodules.
+#   NACP building is skipped as well.
 #---------------------------------------------------------------------------------
 APP_TITLE	:=	ftpd snap! $(VERSION)
 APP_AUTHOR	:=	mtheall, TuxSH, WinterMute
-ICON 	:= meta/ftpd.jpg
+ICON		:=	meta/ftpd.jpg
 APP_VERSION	:=	$(VERSION)
-#---------------------------------------------------------------------------------
+
-TARGET		:=	ftpd
+TARGET		:=	$(notdir $(CURDIR))-nx
 BUILD		:=	build.switch
-SOURCES		:=	source
+SOURCES		:=	source source/imgui source/nx
 DATA		:=	data
 INCLUDES	:=	include
-EXEFS_SRC	:=	exefs_src
+GRAPHICS	:=	gfx.switch
+ROMFS		:=	romfs.switch
+
+# Output folders for autogenerated files in romfs
+OUT_SHADERS	:=	shaders
 
 #---------------------------------------------------------------------------------
 # options for code generation
 #---------------------------------------------------------------------------------
-ARCH	:=	-march=armv8-a -mtp=soft -fPIE
+ARCH	:=	-march=armv8-a+crc+crypto -mtune=cortex-a57 -mtp=soft -fPIE
 
-CFLAGS	:=	-g -Wall -O2 \
+CFLAGS	:=	-g -Wall -Wno-narrowing -Os -ffunction-sections -fdata-sections -save-temps \
-			-ffast-math \
 			$(ARCH) $(DEFINES)
 
-CFLAGS	+=	$(INCLUDE) -D__SWITCH__  -DSTATUS_STRING="\"ftpd v$(VERSION)\""
+CFLAGS	+=	$(INCLUDE) -D__SWITCH__ \
+			-DSTATUS_STRING="\"ftpd v$(VERSION)\"" \
+			-DIMGUI_DISABLE_INCLUDE_IMCONFIG_H=1 \
+			`$(PREFIX)pkg-config --cflags libzstd`
 
-CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
+CXXFLAGS	:= $(CFLAGS) -std=gnu++17 -fno-exceptions -fno-rtti
 
 ASFLAGS	:=	-g $(ARCH)
-LDFLAGS	=	-specs=$(DEVKITPRO)/libnx/switch.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+LDFLAGS	=	-specs=$(DEVKITPRO)/libnx/switch.specs -g $(ARCH) \
+			-Wl,-Map,$(notdir $*.map) -Wl,--gc-sections
 
-LIBS	:= -lnx
+LIBS	:= `$(PREFIX)pkg-config --libs libzstd` -ldeko3dd -lnx
 
 #---------------------------------------------------------------------------------
 # list of directories containing libraries, this must be the top level containing
@@ -84,6 +99,8 @@ export DEPSDIR	:=	$(CURDIR)/$(BUILD)
 CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
 CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
 SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+GLSLFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.glsl)))
+GFXFILES	:=	$(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.png)))
 BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
 
 #---------------------------------------------------------------------------------
@@ -91,17 +108,35 @@ BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
 #---------------------------------------------------------------------------------
 ifeq ($(strip $(CPPFILES)),)
 #---------------------------------------------------------------------------------
-	export LD	:=	$(CC)
+export LD	:=	$(CC)
 #---------------------------------------------------------------------------------
 else
 #---------------------------------------------------------------------------------
-	export LD	:=	$(CXX)
+export LD	:=	$(CXX)
 #---------------------------------------------------------------------------------
 endif
 #---------------------------------------------------------------------------------
 
-export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
+export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES))
-			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+export OFILES_SRC	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+export OFILES 	:=	$(OFILES_BIN) $(OFILES_SRC)
+export HFILES_BIN	:=	$(addsuffix .h,$(subst .,_,$(BINFILES)))
+
+ifneq ($(strip $(ROMFS)),)
+	ROMFS_TARGETS :=
+	ROMFS_FOLDERS :=
+	ifneq ($(strip $(OUT_SHADERS)),)
+		ROMFS_SHADERS := $(ROMFS)/$(OUT_SHADERS)
+		ROMFS_TARGETS += $(patsubst %.glsl, $(ROMFS_SHADERS)/%.dksh, $(GLSLFILES))
+		ROMFS_FOLDERS += $(ROMFS_SHADERS)
+	endif
+
+	ROMFS_GFX     := $(addprefix $(ROMFS)/,$(GFXFILES:.png=.rgba.zst))
+	ROMFS_TARGETS += $(ROMFS_GFX)
+	ROMFS_FOLDERS += $(ROMFS)
+
+	export ROMFS_DEPS := $(foreach file,$(ROMFS_TARGETS),$(CURDIR)/$(file))
+endif
 
 export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
 			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
@@ -109,7 +144,18 @@ export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
 
 export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
 
-export BUILD_EXEFS_SRC := $(TOPDIR)/$(EXEFS_SRC)
+ifeq ($(strip $(CONFIG_JSON)),)
+	jsons := $(wildcard *.json)
+	ifneq (,$(findstring $(TARGET).json,$(jsons)))
+		export APP_JSON := $(TOPDIR)/$(TARGET).json
+	else
+		ifneq (,$(findstring config.json,$(jsons)))
+			export APP_JSON := $(TOPDIR)/config.json
+		endif
+	endif
+else
+	export APP_JSON := $(TOPDIR)/$(CONFIG_JSON)
+endif
 
 ifeq ($(strip $(ICON)),)
 	icons := $(wildcard *.jpg)
@@ -136,19 +182,69 @@ ifneq ($(APP_TITLEID),)
 	export NACPFLAGS += --titleid=$(APP_TITLEID)
 endif
 
-.PHONY: $(BUILD) clean all
+ifneq ($(ROMFS),)
+	export NROFLAGS += --romfsdir=$(CURDIR)/$(ROMFS)
+endif
+
+.PHONY: all clean
 
 #---------------------------------------------------------------------------------
-all: $(BUILD)
+all: $(ROMFS_TARGETS) | $(BUILD)
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.switch
+
+nxlink: all
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.switch nxlink
 
 $(BUILD):
-	@[ -d $@ ] || mkdir -p $@
+	@mkdir -p $@
-	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.switch
+
+ifneq ($(strip $(ROMFS_TARGETS)),)
+
+$(ROMFS_TARGETS): | $(ROMFS_FOLDERS)
+
+$(ROMFS_FOLDERS):
+	@mkdir -p $@
+
+$(BUILD)/%.rgba: $(GRAPHICS)/%.png | $(BUILD)
+	@convert $< $@
+	
+$(ROMFS_GFX): $(ROMFS)/%.rgba.zst: $(BUILD)/%.rgba
+	@zstd $< -o $@ --ultra -22
+
+$(ROMFS_SHADERS)/%_vsh.dksh: %_vsh.glsl
+	@echo {vert} $(notdir $<)
+	@uam -s vert -o $@ $<
+
+$(ROMFS_SHADERS)/%_tcsh.dksh: %_tcsh.glsl
+	@echo {tess_ctrl} $(notdir $<)
+	@uam -s tess_ctrl -o $@ $<
+
+$(ROMFS_SHADERS)/%_tesh.dksh: %_tesh.glsl
+	@echo {tess_eval} $(notdir $<)
+	@uam -s tess_eval -o $@ $<
+
+$(ROMFS_SHADERS)/%_gsh.dksh: %_gsh.glsl
+	@echo {geom} $(notdir $<)
+	@uam -s geom -o $@ $<
+
+$(ROMFS_SHADERS)/%_fsh.dksh: %_fsh.glsl
+	@echo {frag} $(notdir $<)
+	@uam -s frag -o $@ $<
+
+$(ROMFS_SHADERS)/%.dksh: %.glsl
+	@echo {comp} $(notdir $<)
+	@uam -s comp -o $@ $<
+
+endif
 
 #---------------------------------------------------------------------------------
 clean:
 	@echo clean ...
-	@rm -fr $(BUILD) $(TARGET).pfs0 $(TARGET).nso $(TARGET).nro $(TARGET).nacp $(TARGET).elf
+ifeq ($(strip $(APP_JSON)),)
+	@$(RM) -r $(BUILD) $(ROMFS)/*.zst $(ROMFS_FOLDERS) $(TARGET).nro $(TARGET).nacp $(TARGET).elf
+else
+	@$(RM) -r $(BUILD) $(ROMFS_FOLDERS) $(TARGET).nsp $(TARGET).nso $(TARGET).npdm $(TARGET).elf
+endif
 
 
 #---------------------------------------------------------------------------------
@@ -160,24 +256,37 @@ DEPENDS	:=	$(OFILES:.o=.d)
 #---------------------------------------------------------------------------------
 # main targets
 #---------------------------------------------------------------------------------
-all	:	$(OUTPUT).pfs0 $(OUTPUT).nro
+ifeq ($(strip $(APP_JSON)),)
 
-$(OUTPUT).pfs0	:	$(OUTPUT).nso
+all	:	$(OUTPUT).nro
+
+nxlink: $(OUTPUT).nro
+	@nxlink -s $(OUTPUT).nro
+
+ifeq ($(strip $(NO_NACP)),)
+$(OUTPUT).nro	:	$(OUTPUT).elf $(OUTPUT).nacp $(ROMFS_DEPS)
+else
+$(OUTPUT).nro	:	$(OUTPUT).elf $(ROMFS_DEPS)
+endif
+
+else
+
+all	:	$(OUTPUT).nsp
+
+$(OUTPUT).nsp	:	$(OUTPUT).nso $(OUTPUT).npdm
 
 $(OUTPUT).nso	:	$(OUTPUT).elf
 
-ifeq ($(strip $(NO_NACP)),)
-$(OUTPUT).nro	:	$(OUTPUT).elf $(OUTPUT).nacp
-else
-$(OUTPUT).nro	:	$(OUTPUT).elf
 endif
 
 $(OUTPUT).elf	:	$(OFILES)
 
+$(OFILES_SRC)	: $(HFILES_BIN)
+
 #---------------------------------------------------------------------------------
 # you need a rule like this for each extension you use as binary data
 #---------------------------------------------------------------------------------
-%.bin.o	:	%.bin
+%.bin.o	%_bin.h :	%.bin
 #---------------------------------------------------------------------------------
 	@echo $(notdir $<)
 	@$(bin2o)

README.md

@@ -10,15 +10,15 @@ FTP Server for 3DS/Switch/Linux.
 
 ## Latest Builds
 
-CIA: https://mtheall.com/~mtheall/ftpd.cia
+CIA: https://mtheall.com/~mtheall/ftpd-3ds.cia
 
-3DSX: https://mtheall.com/~mtheall/ftpd.3dsx
+3DSX: https://mtheall.com/~mtheall/ftpd-3ds.3dsx
 
-NRO: https://mtheall.com/~mtheall/ftpd.nro
+NRO: https://mtheall.com/~mtheall/ftpd-nx.nro
 
 CIA QR Code
 
-![ftpd.cia](https://github.com/mtheall/ftpd/raw/master/ftpd_qr.png)
+![ftpd-3ds.cia](https://github.com/mtheall/ftpd/raw/master/ftpd_qr.png)
 
 ## Build and install
 
@@ -26,7 +26,7 @@ You must set up the [development environment](https://devkitpro.org/wiki/Getting
 
 ### 3DSX
 
-The following pacman packages are required to build `ftpd.3dsx`:
+The following pacman packages are required to build `ftpd-3ds.3dsx`:
 
     3dstools
     devkitARM
@@ -34,13 +34,13 @@ The following pacman packages are required to build `ftpd.3dsx`:
 
 They are available as part of the `3ds-dev` meta-package.
 
-Build `ftpd.3dsx`:
+Build `ftpd-3ds.3dsx`:
 
     make 3dsx
 
 ### NRO
 
-The following pacman packages are required to build `ftpd.nro`:
+The following pacman packages are required to build `ftpd-nx.nro`:
 
     devkitA64
     libnx
@@ -48,7 +48,7 @@ The following pacman packages are required to build `ftpd.nro`:
 
 They are available as part of the `switch-dev` meta-package.
 
-Build `ftpd.nro`:
+Build `ftpd-nx.nro`:
 
     make nro
 

delog.py

@@ -1,9 +0,0 @@
-#!/usr/bin/env python
-
-import sys
-import re
-
-if __name__ == '__main__':
-  regex = re.compile('\x1b\[[0-9]*;[0-9]*H')
-  for line in sys.stdin:
-    print(regex.sub('', line).strip())

gfx.3ds/gfx.t3s

@@ -0,0 +1,12 @@
+-f rgba -z auto --atlas
+battery0.png
+battery1.png
+battery2.png
+battery3.png
+battery4.png
+batteryCharge.png
+c3dlogo.png
+wifiNull.png
+wifi1.png
+wifi2.png
+wifi3.png

include/console.h

@@ -1,44 +0,0 @@
-#pragma once
-
-#ifdef _3DS
-#include <3ds.h>
-#elif defined(__SWITCH__)
-#include <switch.h>
-#endif
-
-#if defined(_3DS) || defined(__SWITCH__)
-#define ESC(x) "\x1b[" #x
-#define RESET   ESC(0m)
-#define BLACK   ESC(30m)
-#define RED     ESC(31;1m)
-#define GREEN   ESC(32;1m)
-#define YELLOW  ESC(33;1m)
-#define BLUE    ESC(34;1m)
-#define MAGENTA ESC(35;1m)
-#define CYAN    ESC(36;1m)
-#define WHITE   ESC(37;1m)
-#else
-#define ESC(x)
-#define RESET
-#define BLACK
-#define RED
-#define GREEN
-#define YELLOW
-#define BLUE
-#define MAGENTA
-#define CYAN
-#define WHITE
-#endif
-
-void console_init(void);
-
-__attribute__((format(printf,1,2)))
-void console_set_status(const char *fmt, ...);
-
-__attribute__((format(printf,1,2)))
-void console_print(const char *fmt, ...);
-
-__attribute__((format(printf,1,2)))
-void debug_print(const char *fmt, ...);
-
-void console_render(void);

include/fs.h

@@ -0,0 +1,113 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <dirent.h>
+
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <memory>
+
+namespace fs
+{
+std::string printSize (std::uint64_t size_);
+
+class File
+{
+public:
+	~File ();
+
+	File ();
+
+	File (File const &that_) = delete;
+
+	File (File &&that_);
+
+	File &operator= (File const &that_) = delete;
+
+	File &operator= (File &&that_);
+
+	operator bool () const;
+	operator FILE * () const;
+
+	void setBufferSize (std::size_t size_);
+
+	bool open (char const *path_, char const *mode_ = "rb");
+	void close ();
+
+	ssize_t seek (std::size_t pos_, int origin_);
+
+	ssize_t read (void *data_, std::size_t size_);
+	bool readAll (void *data_, std::size_t size_);
+
+	ssize_t write (void const *data_, std::size_t size_);
+	bool writeAll (void const *data_, std::size_t size_);
+
+	template <typename T>
+	T read ()
+	{
+		T data;
+		if (read (&data, sizeof (data)) != sizeof (data))
+			std::abort ();
+
+		return data;
+	}
+
+	template <typename T>
+	void write (T const &data_)
+	{
+		if (write (&data_, sizeof (data_)) != sizeof (data_))
+			std::abort ();
+	}
+
+private:
+	std::unique_ptr<std::FILE, int (*) (std::FILE *)> m_fp{nullptr, nullptr};
+	std::unique_ptr<char[]> m_buffer;
+	std::size_t m_bufferSize = 0;
+};
+
+class Dir
+{
+public:
+	~Dir ();
+
+	Dir ();
+
+	Dir (Dir const &that_) = delete;
+
+	Dir (Dir &&that_);
+
+	Dir &operator= (Dir const &that_) = delete;
+
+	Dir &operator= (Dir &&that_);
+
+	operator bool () const;
+	operator DIR * () const;
+
+	bool open (char const *const path_);
+	void close ();
+	struct dirent *read ();
+
+private:
+	std::unique_ptr<DIR, int (*) (DIR *)> m_dp{nullptr, nullptr};
+};
+}

include/ftp.h

@@ -1,13 +0,0 @@
-#pragma once
-
-/*! Loop status */
-typedef enum
-{
-  LOOP_CONTINUE, /*!< Continue looping */
-  LOOP_RESTART,  /*!< Reinitialize */
-  LOOP_EXIT,     /*!< Terminate looping */
-} loop_status_t;
-
-int           ftp_init(void);
-loop_status_t ftp_loop(void);
-void          ftp_exit(void);

include/ftpServer.h

@@ -0,0 +1,73 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include "ftpSession.h"
+#include "log.h"
+#include "platform.h"
+#include "socket.h"
+
+#include <atomic>
+#include <chrono>
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+class FtpServer;
+using UniqueFtpServer = std::unique_ptr<FtpServer>;
+
+class FtpServer
+{
+public:
+	~FtpServer ();
+
+	void draw ();
+
+	static UniqueFtpServer create (std::uint16_t port_);
+
+	static void updateFreeSpace ();
+
+	static std::time_t startTime ();
+
+private:
+	FtpServer (std::uint16_t port_);
+
+	void handleStartButton ();
+	void handleStopButton ();
+
+	void loop ();
+	void threadFunc ();
+
+	platform::Thread m_thread;
+	platform::Mutex m_lock;
+
+	UniqueSocket m_socket;
+
+	std::string m_name;
+
+	SharedLog m_log;
+
+	std::vector<UniqueFtpSession> m_sessions;
+
+	std::uint16_t m_port;
+
+	std::atomic<bool> m_quit;
+};

include/ftpSession.h

@@ -0,0 +1,205 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include "fs.h"
+#include "ioBuffer.h"
+#include "platform.h"
+#include "socket.h"
+
+#include <chrono>
+#include <memory>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+class FtpSession;
+using UniqueFtpSession = std::unique_ptr<FtpSession>;
+
+class FtpSession
+{
+public:
+	~FtpSession ();
+
+	bool dead ();
+
+	void draw ();
+
+	static UniqueFtpSession create (UniqueSocket commandSocket_);
+
+	static void poll (std::vector<UniqueFtpSession> const &sessions_);
+
+private:
+	constexpr static auto COMMAND_BUFFERSIZE  = 4096;
+	constexpr static auto RESPONSE_BUFFERSIZE = 32768;
+	constexpr static auto XFER_BUFFERSIZE     = 65536;
+	constexpr static auto FILE_BUFFERSIZE     = 4 * XFER_BUFFERSIZE;
+
+#ifdef _3DS
+	constexpr static auto SOCK_BUFFERSIZE  = 32768;
+	constexpr static auto POSITION_HISTORY = 100;
+#else
+	constexpr static auto SOCK_BUFFERSIZE  = XFER_BUFFERSIZE;
+	constexpr static auto POSITION_HISTORY = 300;
+#endif
+
+	enum class State
+	{
+		COMMAND,
+		DATA_CONNECT,
+		DATA_TRANSFER,
+	};
+
+	enum class XferFileMode
+	{
+		RETR,
+		STOR,
+		APPE,
+	};
+
+	enum class XferDirMode
+	{
+		LIST,
+		MLSD,
+		MLST,
+		NLST,
+		STAT,
+	};
+
+	FtpSession (UniqueSocket commandSocket_);
+
+	void setState (State state_, bool closePasv_, bool closeData_);
+
+	void closeData ();
+
+	bool changeDir (char const *args_);
+
+	bool dataAccept ();
+	bool dataConnect ();
+
+	void updateFreeSpace ();
+
+	int fillDirent (struct stat const &st_, std::string_view path_, char const *type_ = nullptr);
+	int fillDirent (std::string const &path_, char const *type_ = nullptr);
+	void xferFile (char const *args_, XferFileMode mode_);
+	void xferDir (char const *args_, XferDirMode mode_, bool workaround_);
+
+	void readCommand (int events_);
+	void writeResponse ();
+
+	__attribute__ ((format (printf, 2, 3))) void sendResponse (char const *fmt_, ...);
+	void sendResponse (std::string_view response_);
+
+	bool (FtpSession::*m_transfer) () = nullptr;
+
+	bool listTransfer ();
+	bool retrieveTransfer ();
+	bool storeTransfer ();
+
+	platform::Mutex m_lock;
+
+	SharedSocket m_commandSocket;
+	UniqueSocket m_pasvSocket;
+	SharedSocket m_dataSocket;
+	std::vector<SharedSocket> m_pendingCloseSocket;
+
+	IOBuffer m_commandBuffer;
+	IOBuffer m_responseBuffer;
+	IOBuffer m_xferBuffer;
+
+	SockAddr m_pasvAddr;
+	SockAddr m_portAddr;
+
+	std::string m_cwd = "/";
+	std::string m_lwd;
+	std::string m_rename;
+	std::string m_workItem;
+
+	std::string m_windowName;
+	std::string m_plotName;
+
+	std::uint64_t m_restartPosition = 0;
+	std::uint64_t m_filePosition    = 0;
+	std::uint64_t m_fileSize        = 0;
+
+	platform::steady_clock::time_point m_filePositionTime;
+	std::uint64_t m_filePositionHistory[POSITION_HISTORY];
+	float m_filePositionDeltas[POSITION_HISTORY];
+	float m_xferRate;
+
+	State m_state = State::COMMAND;
+
+	fs::File m_file;
+	fs::Dir m_dir;
+
+	XferDirMode m_xferDirMode;
+
+	bool m_pasv : 1;
+	bool m_port : 1;
+	bool m_recv : 1;
+	bool m_send : 1;
+	bool m_urgent : 1;
+
+	bool m_mlstType : 1;
+	bool m_mlstSize : 1;
+	bool m_mlstModify : 1;
+	bool m_mlstPerm : 1;
+	bool m_mlstUnixMode : 1;
+
+	void ABOR (char const *args_);
+	void ALLO (char const *args_);
+	void APPE (char const *args_);
+	void CDUP (char const *args_);
+	void CWD (char const *args_);
+	void DELE (char const *args_);
+	void FEAT (char const *args_);
+	void HELP (char const *args_);
+	void LIST (char const *args_);
+	void MDTM (char const *args_);
+	void MKD (char const *args_);
+	void MLSD (char const *args_);
+	void MLST (char const *args_);
+	void MODE (char const *args_);
+	void NLST (char const *args_);
+	void NOOP (char const *args_);
+	void OPTS (char const *args_);
+	void PASS (char const *args_);
+	void PASV (char const *args_);
+	void PORT (char const *args_);
+	void PWD (char const *args_);
+	void QUIT (char const *args_);
+	void REST (char const *args_);
+	void RETR (char const *args_);
+	void RMD (char const *args_);
+	void RNFR (char const *args_);
+	void RNTO (char const *args_);
+	void SIZE (char const *args_);
+	void STAT (char const *args_);
+	void STOR (char const *args_);
+	void STOU (char const *args_);
+	void STRU (char const *args_);
+	void SYST (char const *args_);
+	void TYPE (char const *args_);
+	void USER (char const *args_);
+
+	static std::vector<std::pair<std::string_view, void (FtpSession::*) (char const *)>> const
+	    handlers;
+};

include/imgui.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

include/ioBuffer.h

@@ -0,0 +1,51 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <cstddef>
+#include <memory>
+
+class IOBuffer
+{
+public:
+	~IOBuffer ();
+
+	IOBuffer (std::size_t size_);
+
+	char *freeArea () const;
+	std::size_t freeSize () const;
+	void markFree (std::size_t size_);
+
+	char *usedArea () const;
+	std::size_t usedSize () const;
+	void markUsed (std::size_t size_);
+
+	bool empty () const;
+	std::size_t capacity () const;
+	void clear ();
+	void coalesce ();
+
+private:
+	std::unique_ptr<char[]> m_buffer;
+	std::size_t const m_size;
+	std::size_t m_start = 0;
+	std::size_t m_end   = 0;
+};

include/log.h

@@ -0,0 +1,81 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include "platform.h"
+
+#include <cstdarg>
+#include <memory>
+#include <string>
+#include <string_view>
+#include <vector>
+
+class Log;
+using SharedLog = std::shared_ptr<Log>;
+using WeakLog   = std::weak_ptr<Log>;
+
+class Log
+{
+public:
+	enum Level
+	{
+		DEBUG,
+		INFO,
+		ERROR,
+		COMMAND,
+		RESPONSE,
+	};
+
+	~Log ();
+
+	void draw ();
+
+	static SharedLog create ();
+	static void bind (SharedLog log_);
+
+	__attribute__ ((format (printf, 1, 2))) static void debug (char const *fmt_, ...);
+	__attribute__ ((format (printf, 1, 2))) static void info (char const *fmt_, ...);
+	__attribute__ ((format (printf, 1, 2))) static void error (char const *fmt_, ...);
+	__attribute__ ((format (printf, 1, 2))) static void command (char const *fmt_, ...);
+	__attribute__ ((format (printf, 1, 2))) static void response (char const *fmt_, ...);
+
+	static void log (Level level_, char const *fmt_, va_list ap_);
+	static void log (Level level_, std::string_view message_);
+
+private:
+	Log ();
+
+	void _log (Level level_, char const *fmt_, va_list ap_);
+
+	struct Message
+	{
+		Message (Level const level_, std::string message_)
+		    : level (level_), message (std::move (message_))
+		{
+		}
+
+		Level level;
+		std::string message;
+	};
+
+	std::vector<Message> m_messages;
+	platform::Mutex m_lock;
+};

include/platform.h

@@ -0,0 +1,95 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#ifdef _3DS
+#include <3ds.h>
+#endif
+
+#include <chrono>
+#include <cstdint>
+#include <functional>
+#include <memory>
+
+namespace platform
+{
+bool init ();
+bool loop ();
+void render ();
+void exit ();
+
+#ifdef _3DS
+struct steady_clock
+{
+	using rep        = std::uint64_t;
+	using period     = std::ratio<1, SYSCLOCK_ARM11>;
+	using duration   = std::chrono::duration<rep, period>;
+	using time_point = std::chrono::time_point<steady_clock>;
+
+	constexpr static bool is_steady = true;
+	static time_point now () noexcept
+	{
+		return time_point (duration (svcGetSystemTick ()));
+	}
+};
+#else
+using steady_clock = std::chrono::steady_clock;
+#endif
+
+class Thread
+{
+public:
+	~Thread ();
+	Thread ();
+
+	Thread (std::function<void ()> func_);
+
+	Thread (Thread const &that_) = delete;
+
+	Thread (Thread &&that_);
+
+	Thread &operator= (Thread const &that_) = delete;
+
+	Thread &operator= (Thread &&that_);
+
+	void join ();
+
+	static void sleep (std::chrono::milliseconds timeout_);
+
+private:
+	class privateData_t;
+	std::unique_ptr<privateData_t> m_d;
+};
+
+class Mutex
+{
+public:
+	~Mutex ();
+	Mutex ();
+
+	void lock ();
+	void unlock ();
+
+private:
+	class privateData_t;
+	std::unique_ptr<privateData_t> m_d;
+};
+}

include/sockAddr.h

@@ -0,0 +1,70 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+#include <cstdint>
+
+class SockAddr
+{
+public:
+	~SockAddr ();
+
+	SockAddr ();
+
+	SockAddr (SockAddr const &that_);
+
+	SockAddr (SockAddr &&that_);
+
+	SockAddr &operator= (SockAddr const &that_);
+
+	SockAddr &operator= (SockAddr &&that_);
+
+	SockAddr (struct sockaddr const &addr_);
+
+	SockAddr (struct sockaddr_in const &addr_);
+
+#ifndef _3DS
+	SockAddr (struct sockaddr_in6 const &addr_);
+#endif
+
+	SockAddr (struct sockaddr_storage const &addr_);
+
+	operator struct sockaddr_in const & () const;
+
+#ifndef _3DS
+	operator struct sockaddr_in6 const & () const;
+#endif
+
+	operator struct sockaddr_storage const & () const;
+
+	operator struct sockaddr * ();
+	operator struct sockaddr const * () const;
+
+	std::uint16_t port () const;
+	char const *name (char *buffer_, std::size_t size_) const;
+	char const *name () const;
+
+private:
+	struct sockaddr_storage m_addr = {};
+};

include/socket.h

@@ -0,0 +1,97 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include "ioBuffer.h"
+#include "sockAddr.h"
+
+#include <chrono>
+#include <memory>
+
+class Socket;
+using UniqueSocket = std::unique_ptr<Socket>;
+using SharedSocket = std::shared_ptr<Socket>;
+
+class Socket
+{
+public:
+	struct PollInfo
+	{
+		std::reference_wrapper<Socket> socket;
+		int events;
+		int revents;
+	};
+
+	~Socket ();
+
+	UniqueSocket accept ();
+	int atMark ();
+	bool bind (SockAddr const &addr_);
+	bool connect (SockAddr const &addr_);
+	bool listen (int backlog_);
+	bool shutdown (int how_);
+
+	bool setLinger (bool enable_, std::chrono::seconds time_);
+	bool setNonBlocking (bool nonBlocking_ = true);
+	bool setReuseAddress (bool reuse_ = true);
+	bool setRecvBufferSize (std::size_t size_);
+	bool setSendBufferSize (std::size_t size_);
+
+	ssize_t read (void *buffer_, std::size_t size_, bool oob_ = false);
+	ssize_t read (IOBuffer &buffer_, bool oob_ = false);
+	ssize_t write (void const *buffer_, std::size_t size_);
+	ssize_t write (IOBuffer &buffer_);
+
+	SockAddr const &sockName () const;
+	SockAddr const &peerName () const;
+
+	static UniqueSocket create ();
+
+	static int poll (PollInfo *info_, std::size_t count_, std::chrono::milliseconds timeout_);
+
+	int fd () const
+	{
+		return m_fd;
+	}
+
+private:
+	Socket () = delete;
+
+	Socket (int fd_);
+
+	Socket (int fd_, SockAddr const &sockName_, SockAddr const &peerName_);
+
+	Socket (Socket const &that_) = delete;
+
+	Socket (Socket &&that_) = delete;
+
+	Socket &operator= (Socket const &that_) = delete;
+
+	Socket &operator= (Socket &&that_) = delete;
+
+	SockAddr m_sockName;
+	SockAddr m_peerName;
+
+	int const m_fd;
+
+	bool m_listening : 1;
+	bool m_connected : 1;
+};

source/3ds/imgui_citro3d.cpp

@@ -0,0 +1,623 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "imgui_citro3d.h"
+
+#include <citro3d.h>
+
+#include "vshader_shbin.h"
+
+#include "imgui.h"
+
+#include <algorithm>
+#include <cstdlib>
+#include <cstring>
+#include <vector>
+
+namespace
+{
+std::vector<ImWchar> s_fontRanges;
+
+constexpr auto CLEAR_COLOR = 0x204B7AFF;
+
+constexpr auto DISPLAY_TRANSFER_FLAGS =
+    GX_TRANSFER_FLIP_VERT (0) | GX_TRANSFER_OUT_TILED (0) | GX_TRANSFER_RAW_COPY (0) |
+    GX_TRANSFER_IN_FORMAT (GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT (GX_TRANSFER_FMT_RGB8) |
+    GX_TRANSFER_SCALING (GX_TRANSFER_SCALE_NO);
+
+C3D_RenderTarget *s_top    = nullptr;
+C3D_RenderTarget *s_bottom = nullptr;
+
+DVLB_s *s_vsh = nullptr;
+shaderProgram_s s_program;
+
+int s_projLocation;
+C3D_Mtx s_projTop;
+C3D_Mtx s_projBottom;
+
+std::vector<C3D_Tex> s_fontTextures;
+float s_textScale;
+
+std::uint32_t s_boundScissor[4];
+ImDrawVert *s_boundVtxData;
+C3D_Tex *s_boundTexture;
+
+ImDrawVert *s_vtxData = nullptr;
+std::size_t s_vtxSize = 0;
+ImDrawIdx *s_idxData  = nullptr;
+std::size_t s_idxSize = 0;
+
+std::uint32_t fontCodePointFromGlyphIndex (CFNT_s *const font_, int const glyphIndex_)
+{
+	for (auto cmap = fontGetInfo (font_)->cmap; cmap; cmap = cmap->next)
+	{
+		switch (cmap->mappingMethod)
+		{
+		case CMAP_TYPE_DIRECT:
+			assert (cmap->codeEnd >= cmap->codeBegin);
+			if (glyphIndex_ >= cmap->indexOffset &&
+			    glyphIndex_ <= cmap->codeEnd - cmap->codeBegin + cmap->indexOffset)
+				return glyphIndex_ - cmap->indexOffset + cmap->codeBegin;
+			break;
+
+		case CMAP_TYPE_TABLE:
+			for (int i = 0; i <= cmap->codeEnd - cmap->codeBegin; ++i)
+			{
+				if (cmap->indexTable[i] == glyphIndex_)
+					return cmap->codeBegin + i;
+			}
+			break;
+
+		case CMAP_TYPE_SCAN:
+			for (unsigned i = 0; i < cmap->nScanEntries; ++i)
+			{
+				assert (cmap->scanEntries[i].code >= cmap->codeBegin);
+				assert (cmap->scanEntries[i].code <= cmap->codeEnd);
+				if (glyphIndex_ == cmap->scanEntries[i].glyphIndex)
+					return cmap->scanEntries[i].code;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+void setupRenderState (gfxScreen_t const screen_)
+{
+	C3D_CullFace (GPU_CULL_NONE);
+
+	// configure attributes for user with vertex shader
+	auto const attrInfo = C3D_GetAttrInfo ();
+	AttrInfo_Init (attrInfo);
+	AttrInfo_AddLoader (attrInfo, 0, GPU_FLOAT, 2);         // v0 = inPos
+	AttrInfo_AddLoader (attrInfo, 1, GPU_FLOAT, 2);         // v1 = inUv
+	AttrInfo_AddLoader (attrInfo, 2, GPU_UNSIGNED_BYTE, 4); // v2 = inColor
+
+	std::memset (s_boundScissor, 0xFF, sizeof (s_boundScissor));
+	s_boundVtxData = nullptr;
+	s_boundTexture = nullptr;
+
+	C3D_BindProgram (&s_program);
+
+	C3D_DepthTest (true, GPU_GREATER, GPU_WRITE_COLOR);
+
+	C3D_AlphaBlend (GPU_BLEND_ADD,
+	    GPU_BLEND_ADD,
+	    GPU_SRC_ALPHA,
+	    GPU_ONE_MINUS_SRC_ALPHA,
+	    GPU_SRC_ALPHA,
+	    GPU_ONE_MINUS_SRC_ALPHA);
+
+	if (screen_ == GFX_TOP)
+		C3D_FVUnifMtx4x4 (GPU_VERTEX_SHADER, s_projLocation, &s_projTop);
+	else
+		C3D_FVUnifMtx4x4 (GPU_VERTEX_SHADER, s_projLocation, &s_projBottom);
+}
+}
+
+void imgui::citro3d::init ()
+{
+	// Setup back-end capabilities flags
+	ImGuiIO &io = ImGui::GetIO ();
+
+	io.BackendRendererName = "citro3d";
+	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
+
+	C3D_Init (C3D_DEFAULT_CMDBUF_SIZE);
+
+	s_top = C3D_RenderTargetCreate (240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetOutput (s_top, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
+
+	s_bottom = C3D_RenderTargetCreate (240, 320, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetOutput (s_bottom, GFX_BOTTOM, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
+
+	s_vsh = DVLB_ParseFile (
+	    const_cast<std::uint32_t *> (reinterpret_cast<std::uint32_t const *> (vshader_shbin)),
+	    vshader_shbin_size);
+	shaderProgramInit (&s_program);
+	shaderProgramSetVsh (&s_program, &s_vsh->DVLE[0]);
+
+	s_projLocation = shaderInstanceGetUniformLocation (s_program.vertexShader, "proj");
+
+	Mtx_OrthoTilt (&s_projTop, 0.0f, 800.0f, 480.0f, 0.0f, -1.0f, 1.0f, false);
+	Mtx_OrthoTilt (&s_projBottom, 80.0f, 720.0f, 960.0f, 480.0f, -1.0f, 1.0f, false);
+
+	s_vtxSize = 65536;
+	s_vtxData = reinterpret_cast<ImDrawVert *> (linearAlloc (sizeof (ImDrawVert) * s_vtxSize));
+	if (!s_vtxData)
+		svcBreak (USERBREAK_PANIC);
+
+	s_idxSize = 65536;
+	s_idxData = reinterpret_cast<ImDrawIdx *> (linearAlloc (sizeof (ImDrawIdx) * s_idxSize));
+	if (!s_idxData)
+		svcBreak (USERBREAK_PANIC);
+
+	// ensure the shared system font is mapped
+	if (R_FAILED (fontEnsureMapped ()))
+		svcBreak (USERBREAK_PANIC);
+
+	// load the glyph texture sheets
+	auto const font      = fontGetSystemFont ();
+	auto const fontInfo  = fontGetInfo (font);
+	auto const glyphInfo = fontGetGlyphInfo (font);
+	assert (s_fontTextures.empty ());
+	s_fontTextures.resize (glyphInfo->nSheets + 1);
+	std::memset (s_fontTextures.data (), 0x00, s_fontTextures.size () * sizeof (s_fontTextures[0]));
+
+	s_textScale = 30.0f / glyphInfo->cellHeight;
+
+	for (unsigned i = 0; i < glyphInfo->nSheets; ++i)
+	{
+		auto &tex = s_fontTextures[i];
+		tex.data  = fontGetGlyphSheetTex (font, i);
+		if (!tex.data)
+			svcBreak (USERBREAK_PANIC);
+		tex.fmt    = static_cast<GPU_TEXCOLOR> (glyphInfo->sheetFmt);
+		tex.size   = glyphInfo->sheetSize;
+		tex.width  = glyphInfo->sheetWidth;
+		tex.height = glyphInfo->sheetHeight;
+		tex.param  = GPU_TEXTURE_MAG_FILTER (GPU_LINEAR) | GPU_TEXTURE_MIN_FILTER (GPU_LINEAR) |
+		            GPU_TEXTURE_WRAP_S (GPU_REPEAT) | GPU_TEXTURE_WRAP_T (GPU_REPEAT);
+		tex.border   = 0xFFFFFFFF;
+		tex.lodParam = 0;
+	}
+
+	{
+		auto &tex = s_fontTextures[glyphInfo->nSheets];
+		C3D_TexInit (&tex, 8, 8, GPU_A4);
+
+		std::uint32_t size;
+		auto data = C3D_Tex2DGetImagePtr (&tex, 0, &size);
+		if (!data || !size)
+			svcBreak (USERBREAK_PANIC);
+		std::memset (data, 0xFF, size);
+	}
+
+	ImWchar alterChar = fontCodePointFromGlyphIndex (font, fontInfo->alterCharIndex);
+	if (!alterChar)
+		alterChar = '?';
+
+	std::vector<ImWchar> charSet;
+	for (auto cmap = fontInfo->cmap; cmap; cmap = cmap->next)
+	{
+		switch (cmap->mappingMethod)
+		{
+		case CMAP_TYPE_DIRECT:
+		case CMAP_TYPE_TABLE:
+			assert (cmap->codeEnd >= cmap->codeBegin);
+			charSet.reserve (charSet.size () + cmap->codeEnd - cmap->codeBegin + 1);
+			for (auto i = cmap->codeBegin; i <= cmap->codeEnd; ++i)
+				charSet.emplace_back (i);
+			break;
+		case CMAP_TYPE_SCAN:
+			charSet.reserve (charSet.size () + cmap->nScanEntries);
+			for (unsigned i = 0; i < cmap->nScanEntries; ++i)
+			{
+				assert (cmap->scanEntries[i].code >= cmap->codeBegin);
+				assert (cmap->scanEntries[i].code <= cmap->codeEnd);
+				charSet.emplace_back (cmap->scanEntries[i].code);
+			}
+			break;
+		}
+	}
+
+	if (charSet.empty ())
+		svcBreak (USERBREAK_PANIC);
+
+	std::sort (std::begin (charSet), std::end (charSet));
+	charSet.erase (std::unique (std::begin (charSet), std::end (charSet)), std::end (charSet));
+
+	auto it       = std::begin (charSet);
+	ImWchar start = *it++;
+	ImWchar prev  = start;
+	while (it != std::end (charSet))
+	{
+		if (*it != prev + 1)
+		{
+			s_fontRanges.emplace_back (start);
+			s_fontRanges.emplace_back (prev);
+
+			start = *it;
+		}
+
+		prev = *it++;
+	}
+	s_fontRanges.emplace_back (start);
+	s_fontRanges.emplace_back (prev);
+	s_fontRanges.emplace_back (0);
+
+	auto const atlas = ImGui::GetIO ().Fonts;
+	atlas->Clear ();
+	atlas->TexWidth        = glyphInfo->sheetWidth;
+	atlas->TexHeight       = glyphInfo->sheetHeight * glyphInfo->nSheets;
+	atlas->TexUvScale      = ImVec2 (1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
+	atlas->TexUvWhitePixel = ImVec2 (0.5f / 8.0f, glyphInfo->nSheets + 0.5f / 8.0f);
+	atlas->TexPixelsAlpha8 = static_cast<unsigned char *> (IM_ALLOC (1)); // dummy allocation
+
+	ImFontConfig config;
+	config.FontData             = nullptr;
+	config.FontDataSize         = 0;
+	config.FontDataOwnedByAtlas = true;
+	config.FontNo               = 0;
+	config.SizePixels           = 14.0f;
+	config.OversampleH          = 3;
+	config.OversampleV          = 1;
+	config.PixelSnapH           = false;
+	config.GlyphExtraSpacing    = ImVec2 (0.0f, 0.0f);
+	config.GlyphOffset          = ImVec2 (0.0f, 0.0f);
+	config.GlyphRanges          = s_fontRanges.data ();
+	config.GlyphMinAdvanceX     = 0.0f;
+	config.GlyphMaxAdvanceX     = std::numeric_limits<float>::max ();
+	config.MergeMode            = false;
+	config.RasterizerFlags      = 0;
+	config.RasterizerMultiply   = 1.0f;
+	config.EllipsisChar         = 0x2026;
+	std::memset (config.Name, 0, sizeof (config.Name));
+
+	auto const imFont = IM_NEW (ImFont);
+	config.DstFont    = imFont;
+
+	atlas->ConfigData.push_back (config);
+	atlas->Fonts.push_back (imFont);
+	// atlas->CustomRectIds[0] = atlas->AddCustomRectRegular (0x80000000, 108 * 2 + 1, 27);
+	// atlas->CustomRects[0].X = 0;
+	// atlas->CustomRects[0].Y = 0;
+	atlas->SetTexID (s_fontTextures.data ());
+
+	imFont->FallbackAdvanceX = fontInfo->defaultWidth.charWidth;
+	imFont->FontSize         = fontInfo->lineFeed;
+
+	fontGlyphPos_s glyphPos;
+	for (auto const &code : charSet)
+	{
+		auto const glyphIndex = fontGlyphIndexFromCodePoint (font, code);
+		if (glyphIndex < 0)
+			svcBreak (USERBREAK_PANIC);
+
+		fontCalcGlyphPos (&glyphPos,
+		    font,
+		    glyphIndex,
+		    GLYPH_POS_CALC_VTXCOORD | GLYPH_POS_AT_BASELINE,
+		    1.0f,
+		    1.0f);
+
+		ImFontGlyph glyph;
+
+		glyph.Codepoint = code;
+		glyph.AdvanceX  = glyphPos.xAdvance;
+		glyph.X0        = glyphPos.vtxcoord.left;
+		glyph.Y0        = glyphPos.vtxcoord.top;
+		glyph.X1        = glyphPos.vtxcoord.right;
+		glyph.Y1        = glyphPos.vtxcoord.bottom;
+		glyph.U0        = glyphPos.texcoord.left;
+		glyph.V0        = glyphPos.sheetIndex + glyphPos.texcoord.top;
+		glyph.U1        = glyphPos.texcoord.right;
+		glyph.V1        = glyphPos.sheetIndex + glyphPos.texcoord.bottom;
+
+		imFont->Glyphs.push_back (glyph);
+		imFont->MetricsTotalSurface +=
+		    static_cast<int> ((glyph.U1 - glyph.U0) * atlas->TexWidth + 1.99f) *
+		    static_cast<int> ((glyph.V1 - glyph.V0) * atlas->TexHeight + 1.99f);
+	}
+
+	imFont->BuildLookupTable ();
+
+	imFont->DisplayOffset.x = 0.0f;
+	imFont->DisplayOffset.y = fontInfo->ascent;
+
+	imFont->ContainerAtlas  = atlas;
+	imFont->ConfigData      = &atlas->ConfigData[0];
+	imFont->ConfigDataCount = 1;
+	imFont->FallbackChar    = alterChar;
+	imFont->EllipsisChar    = config.EllipsisChar;
+	imFont->Scale           = 1.0f;
+	imFont->Ascent          = fontInfo->ascent;
+	imFont->Descent         = 0.0f;
+}
+
+void imgui::citro3d::exit ()
+{
+	linearFree (s_idxData);
+	linearFree (s_vtxData);
+
+	assert (!s_fontTextures.empty ());
+	C3D_TexDelete (&s_fontTextures.back ());
+
+	shaderProgramFree (&s_program);
+	DVLB_Free (s_vsh);
+
+	C3D_RenderTargetDelete (s_bottom);
+	C3D_RenderTargetDelete (s_top);
+
+	C3D_Fini ();
+}
+
+void imgui::citro3d::newFrame ()
+{
+}
+
+void imgui::citro3d::render ()
+{
+	C3D_FrameBegin (C3D_FRAME_SYNCDRAW);
+	C3D_RenderTargetClear (s_top, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
+	C3D_RenderTargetClear (s_bottom, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
+
+	auto const drawData = ImGui::GetDrawData ();
+	if (drawData->CmdListsCount <= 0)
+	{
+		C3D_FrameEnd (0);
+		return;
+	}
+
+	unsigned width  = drawData->DisplaySize.x * drawData->FramebufferScale.x;
+	unsigned height = drawData->DisplaySize.y * drawData->FramebufferScale.y;
+	if (width <= 0 || height <= 0)
+	{
+		C3D_FrameEnd (0);
+		return;
+	}
+
+	if (s_vtxSize < static_cast<std::size_t> (drawData->TotalVtxCount))
+	{
+		linearFree (s_vtxData);
+
+		// add 10% to avoid growing many frames in a row
+		s_vtxSize = drawData->TotalVtxCount * 1.1f;
+		s_vtxData = reinterpret_cast<ImDrawVert *> (linearAlloc (sizeof (ImDrawVert) * s_vtxSize));
+		if (!s_vtxData)
+			svcBreak (USERBREAK_PANIC);
+	}
+
+	if (s_idxSize < static_cast<std::size_t> (drawData->TotalIdxCount))
+	{
+		// add 10% to avoid growing many frames in a row
+		s_idxSize = drawData->TotalIdxCount * 1.1f;
+		s_idxData = reinterpret_cast<ImDrawIdx *> (linearAlloc (sizeof (ImDrawIdx) * s_idxSize));
+		if (!s_vtxData)
+			svcBreak (USERBREAK_PANIC);
+	}
+
+	// Will project scissor/clipping rectangles into framebuffer space
+	// (0,0) unless using multi-viewports
+	auto const clipOff = drawData->DisplayPos;
+	// (1,1) unless using retina display which are often (2,2)
+	auto const clipScale = drawData->FramebufferScale;
+
+	// copy data into vertex/index buffers
+	std::size_t offsetVtx = 0;
+	std::size_t offsetIdx = 0;
+	for (int i = 0; i < drawData->CmdListsCount; ++i)
+	{
+		auto const &cmdList = *drawData->CmdLists[i];
+		if (s_vtxSize - offsetVtx < static_cast<std::size_t> (cmdList.VtxBuffer.Size))
+			svcBreak (USERBREAK_PANIC);
+		if (s_idxSize - offsetIdx < static_cast<std::size_t> (cmdList.IdxBuffer.Size))
+			svcBreak (USERBREAK_PANIC);
+
+		std::memcpy (&s_vtxData[offsetVtx],
+		    cmdList.VtxBuffer.Data,
+		    sizeof (ImDrawVert) * cmdList.VtxBuffer.Size);
+		std::memcpy (&s_idxData[offsetIdx],
+		    cmdList.IdxBuffer.Data,
+		    sizeof (ImDrawIdx) * cmdList.IdxBuffer.Size);
+
+		offsetVtx += cmdList.VtxBuffer.Size;
+		offsetIdx += cmdList.IdxBuffer.Size;
+	}
+
+	for (auto const &screen : {GFX_TOP, GFX_BOTTOM})
+	{
+		if (screen == GFX_TOP)
+			C3D_FrameDrawOn (s_top);
+		else
+			C3D_FrameDrawOn (s_bottom);
+
+		setupRenderState (screen);
+
+		offsetVtx = 0;
+		offsetIdx = 0;
+
+		// Render command lists
+		for (int i = 0; i < drawData->CmdListsCount; ++i)
+		{
+			auto const &cmdList = *drawData->CmdLists[i];
+			for (auto const &cmd : cmdList.CmdBuffer)
+			{
+				if (cmd.UserCallback)
+				{
+					// User callback, registered via ImDrawList::AddCallback()
+					// (ImDrawCallback_ResetRenderState is a special callback value used by the user
+					// to request the renderer to reset render state.)
+					if (cmd.UserCallback == ImDrawCallback_ResetRenderState)
+						setupRenderState (screen);
+					else
+						cmd.UserCallback (&cmdList, &cmd);
+				}
+				else
+				{
+					// Project scissor/clipping rectangles into framebuffer space
+					ImVec4 clip;
+					clip.x = (cmd.ClipRect.x - clipOff.x) * clipScale.x;
+					clip.y = (cmd.ClipRect.y - clipOff.y) * clipScale.y;
+					clip.z = (cmd.ClipRect.z - clipOff.x) * clipScale.x;
+					clip.w = (cmd.ClipRect.w - clipOff.y) * clipScale.y;
+
+					if (clip.x >= width || clip.y >= height || clip.z < 0.0f || clip.w < 0.0f)
+						continue;
+					if (clip.x < 0.0f)
+						clip.x = 0.0f;
+					if (clip.y < 0.0f)
+						clip.y = 0.0f;
+
+					if (screen == GFX_TOP)
+					{
+						// check if clip starts on bottom screen
+						if (clip.y > 240.0f)
+							continue;
+
+						auto const x1 = std::clamp<unsigned> (240.0f - clip.w, 0, 240);
+						auto const y1 = std::clamp<unsigned> (400.0f - clip.z, 0, 400);
+						auto const x2 = std::clamp<unsigned> (240.0f - clip.y, 0, 240);
+						auto const y2 = std::clamp<unsigned> (400.0f - clip.x, 0, 400);
+
+						C3D_SetScissor (GPU_SCISSOR_NORMAL, x1, y1, x2, y2);
+					}
+					else
+					{
+						// check if clip ends on top screen
+						if (clip.w < 240.0f)
+							continue;
+
+						// check if clip ends before left edge of bottom screen
+						if (clip.z < 40.0f)
+							continue;
+
+						// check if clip starts after right edge of bottom screen
+						if (clip.x > 360.0f)
+							continue;
+
+						auto const x1 = std::clamp<unsigned> (480.0f - clip.w, 0, 240);
+						auto const y1 = std::clamp<unsigned> (360.0f - clip.z, 0, 320);
+						auto const x2 = std::clamp<unsigned> (480.0f - clip.y, 0, 240);
+						auto const y2 = std::clamp<unsigned> (360.0f - clip.x, 0, 320);
+
+						if (s_boundScissor[0] != x1 || s_boundScissor[1] != y1 ||
+						    s_boundScissor[2] != x2 || s_boundScissor[3] != y2)
+						{
+							s_boundScissor[0] = x1;
+							s_boundScissor[1] = y1;
+							s_boundScissor[2] = x2;
+							s_boundScissor[3] = y2;
+							C3D_SetScissor (GPU_SCISSOR_NORMAL, x1, y1, x2, y2);
+						}
+					}
+
+					auto const vtxData = &s_vtxData[cmd.VtxOffset + offsetVtx];
+					if (vtxData != s_boundVtxData)
+					{
+						s_boundVtxData     = &s_vtxData[cmd.VtxOffset + offsetVtx];
+						auto const bufInfo = C3D_GetBufInfo ();
+						BufInfo_Init (bufInfo);
+						BufInfo_Add (bufInfo, s_boundVtxData, sizeof (ImDrawVert), 3, 0x210);
+					}
+
+					auto tex = static_cast<C3D_Tex *> (cmd.TextureId);
+					if (tex == s_fontTextures.data ())
+					{
+						assert (cmd.ElemCount % 3 == 0);
+
+						// TODO get by idx not consecutive vtx
+						auto const getSheet = [] (auto const vtx_, auto const idx_) {
+							unsigned const sheet = std::min (
+							    {vtx_[idx_[0]].uv.y, vtx_[idx_[1]].uv.y, vtx_[idx_[2]].uv.y});
+							for (unsigned i = 0; i < 3; ++i)
+								assert (vtx_[idx_[i]].uv.y - sheet <= 1.0f);
+							return sheet;
+						};
+
+						unsigned boundSheet = getSheet (&s_vtxData[cmd.VtxOffset + offsetVtx],
+						    &s_idxData[cmd.IdxOffset + offsetIdx]);
+
+						unsigned offset = 0;
+
+						C3D_TexBind (0, &s_fontTextures[boundSheet]);
+
+						auto const env = C3D_GetTexEnv (0);
+						C3D_TexEnvInit (env);
+						C3D_TexEnvSrc (
+						    env, C3D_RGB, GPU_PRIMARY_COLOR, GPU_PRIMARY_COLOR, GPU_PRIMARY_COLOR);
+						C3D_TexEnvFunc (env, C3D_RGB, GPU_REPLACE);
+						C3D_TexEnvSrc (
+						    env, C3D_Alpha, GPU_TEXTURE0, GPU_PRIMARY_COLOR, GPU_PRIMARY_COLOR);
+						C3D_TexEnvFunc (env, C3D_Alpha, GPU_MODULATE);
+
+						for (unsigned i = 3; i < cmd.ElemCount; i += 3)
+						{
+							unsigned const sheet = getSheet (&s_vtxData[cmd.VtxOffset + offsetVtx],
+							    &s_idxData[cmd.IdxOffset + offsetIdx + i]);
+							if (boundSheet != sheet)
+							{
+								C3D_DrawElements (GPU_TRIANGLES,
+								    i - offset,
+								    C3D_UNSIGNED_SHORT,
+								    &s_idxData[cmd.IdxOffset + offsetIdx + offset]);
+
+								boundSheet = sheet;
+								offset     = i;
+								C3D_TexBind (0, &s_fontTextures[boundSheet]);
+							}
+						}
+
+						assert ((cmd.ElemCount - offset) % 3 == 0);
+						C3D_DrawElements (GPU_TRIANGLES,
+						    cmd.ElemCount - offset,
+						    C3D_UNSIGNED_SHORT,
+						    &s_idxData[cmd.IdxOffset + offsetIdx + offset]);
+					}
+					else
+					{
+						if (tex != s_boundTexture)
+						{
+							C3D_TexBind (0, tex);
+							auto const env = C3D_GetTexEnv (0);
+							C3D_TexEnvInit (env);
+							C3D_TexEnvSrc (
+							    env, C3D_Both, GPU_TEXTURE0, GPU_PRIMARY_COLOR, GPU_PRIMARY_COLOR);
+							C3D_TexEnvFunc (env, C3D_Both, GPU_MODULATE);
+						}
+
+						C3D_DrawElements (GPU_TRIANGLES,
+						    cmd.ElemCount,
+						    C3D_UNSIGNED_SHORT,
+						    &s_idxData[cmd.IdxOffset + offsetIdx]);
+					}
+
+					s_boundTexture = tex;
+				}
+			}
+
+			offsetVtx += cmdList.VtxBuffer.Size;
+			offsetIdx += cmdList.IdxBuffer.Size;
+		}
+	}
+
+	C3D_FrameEnd (0);
+}

source/3ds/imgui_citro3d.h

@@ -0,0 +1,33 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+namespace imgui
+{
+namespace citro3d
+{
+void init ();
+void exit ();
+
+void newFrame ();
+void render ();
+}
+}

source/3ds/imgui_ctru.cpp

@@ -0,0 +1,163 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "imgui_ctru.h"
+
+#include "imgui.h"
+
+#include "fs.h"
+
+#include <3ds.h>
+
+#include <chrono>
+#include <cstring>
+#include <functional>
+#include <string>
+#include <tuple>
+using namespace std::chrono_literals;
+
+namespace
+{
+constexpr auto SCREEN_WIDTH  = 400.0f;
+constexpr auto SCREEN_HEIGHT = 480.0f;
+
+std::string s_clipboard;
+
+char const *getClipboardText (void *const userData_)
+{
+	(void)userData_;
+	return s_clipboard.c_str ();
+}
+
+void setClipboardText (void *const userData_, char const *const text_)
+{
+	(void)userData_;
+	s_clipboard = text_;
+}
+
+void updateTouch (ImGuiIO &io_)
+{
+	if (!((hidKeysDown () | hidKeysHeld ()) & KEY_TOUCH))
+	{
+		io_.MousePos     = ImVec2 (-10.0f, -10.0f);
+		io_.MouseDown[0] = false;
+		return;
+	}
+
+	touchPosition pos;
+	hidTouchRead (&pos);
+
+	// transform to bottom-screen space
+	io_.MousePos     = ImVec2 ((pos.px + 40.0f) * 2.0f, (pos.py + 240.0f) * 2.0f);
+	io_.MouseDown[0] = true;
+}
+
+void updateGamepads (ImGuiIO &io_)
+{
+	std::memset (io_.NavInputs, 0, sizeof (io_.NavInputs));
+
+	auto const buttonMapping = {
+	    std::make_pair (KEY_A, ImGuiNavInput_Activate),
+	    std::make_pair (KEY_B, ImGuiNavInput_Cancel),
+	    std::make_pair (KEY_X, ImGuiNavInput_Input),
+	    std::make_pair (KEY_Y, ImGuiNavInput_Menu),
+	    std::make_pair (KEY_L, ImGuiNavInput_FocusPrev),
+	    std::make_pair (KEY_L, ImGuiNavInput_TweakSlow),
+	    std::make_pair (KEY_R, ImGuiNavInput_FocusNext),
+	    std::make_pair (KEY_R, ImGuiNavInput_TweakFast),
+	    std::make_pair (KEY_DUP, ImGuiNavInput_DpadUp),
+	    std::make_pair (KEY_DRIGHT, ImGuiNavInput_DpadRight),
+	    std::make_pair (KEY_DDOWN, ImGuiNavInput_DpadDown),
+	    std::make_pair (KEY_DLEFT, ImGuiNavInput_DpadLeft),
+	};
+
+	auto const keys = hidKeysHeld ();
+	for (auto const &[in, out] : buttonMapping)
+	{
+		if (keys & in)
+			io_.NavInputs[out] = 1.0f;
+	}
+
+	circlePosition cpad;
+	auto const analogMapping = {
+	    std::make_tuple (std::ref (cpad.dx), ImGuiNavInput_LStickLeft, -0.3f, -0.9f),
+	    std::make_tuple (std::ref (cpad.dx), ImGuiNavInput_LStickRight, +0.3f, +0.9f),
+	    std::make_tuple (std::ref (cpad.dy), ImGuiNavInput_LStickUp, +0.3f, +0.9f),
+	    std::make_tuple (std::ref (cpad.dy), ImGuiNavInput_LStickDown, -0.3f, -0.9f),
+	};
+
+	hidCircleRead (&cpad);
+	for (auto const &[in, out, min, max] : analogMapping)
+	{
+		auto const value   = in / static_cast<float> (0x9C);
+		auto const v       = std::min (1.0f, (value - min) / (max - min));
+		io_.NavInputs[out] = std::max (io_.NavInputs[out], v);
+	}
+}
+}
+
+bool imgui::ctru::init ()
+{
+	ImGuiIO &io = ImGui::GetIO ();
+
+	io.IniFilename = nullptr;
+
+	io.ConfigFlags |= ImGuiConfigFlags_IsTouchScreen;
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+
+	io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
+
+	io.BackendPlatformName = "3ds";
+
+	io.MouseDrawCursor = false;
+
+	io.SetClipboardTextFn = setClipboardText;
+	io.GetClipboardTextFn = getClipboardText;
+	io.ClipboardUserData  = nullptr;
+
+	return true;
+}
+
+void imgui::ctru::newFrame ()
+{
+	ImGuiIO &io = ImGui::GetIO ();
+
+	IM_ASSERT (io.Fonts->IsBuilt () &&
+	           "Font atlas not built! It is generally built by the renderer back-end. Missing call "
+	           "to renderer _NewFrame() function?");
+
+	io.DisplaySize             = ImVec2 (SCREEN_WIDTH * 2.0f, SCREEN_HEIGHT * 2.0f);
+	io.DisplayFramebufferScale = ImVec2 (0.5f, 0.5f);
+
+	// Setup time step
+	static auto const start = svcGetSystemTick ();
+	static auto prev        = start;
+	auto const now          = svcGetSystemTick ();
+
+	io.DeltaTime = (now - prev) / static_cast<float> (SYSCLOCK_ARM11);
+	prev         = now;
+
+	updateTouch (io);
+	updateGamepads (io);
+}
+
+void imgui::ctru::exit ()
+{
+}

source/3ds/imgui_ctru.h

@@ -0,0 +1,32 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+namespace imgui
+{
+namespace ctru
+{
+bool init ();
+void exit ();
+
+void newFrame ();
+}
+}

source/3ds/platform.cpp

@@ -0,0 +1,348 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "platform.h"
+
+#include "fs.h"
+#include "log.h"
+
+#include "imgui_citro3d.h"
+#include "imgui_ctru.h"
+
+#include "imgui.h"
+
+#include <3ds.h>
+#include <citro3d.h>
+#include <tex3ds.h>
+
+#include "gfx.h"
+
+#include <cassert>
+#include <chrono>
+#include <ctime>
+#include <malloc.h>
+
+namespace
+{
+constexpr auto STACK_SIZE      = 32768;
+constexpr auto SOCU_ALIGN      = 0x1000;
+constexpr auto SOCU_BUFFERSIZE = 0x100000;
+
+static_assert (SOCU_BUFFERSIZE % SOCU_ALIGN == 0);
+
+bool s_socuActive = false;
+u32 *s_socuBuffer = nullptr;
+
+C3D_Tex s_gfxTexture;
+Tex3DS_Texture s_gfxT3x;
+
+void startNetwork ()
+{
+	if (s_socuActive)
+		return;
+
+	std::uint32_t wifi = 0;
+	if (R_FAILED (ACU_GetWifiStatus (&wifi)) || !wifi)
+		return;
+
+	if (!s_socuBuffer)
+		s_socuBuffer = static_cast<u32 *> (::memalign (SOCU_ALIGN, SOCU_BUFFERSIZE));
+
+	if (!s_socuBuffer)
+		return;
+
+	if (R_FAILED (socInit (s_socuBuffer, SOCU_BUFFERSIZE)))
+		return;
+
+	s_socuActive = true;
+	Log::info ("Wifi connected\n");
+}
+
+void drawLogo ()
+{
+	auto subTex = Tex3DS_GetSubTexture (s_gfxT3x, gfx_c3dlogo_idx);
+
+	ImGuiIO &io             = ImGui::GetIO ();
+	auto const screenWidth  = io.DisplaySize.x;
+	auto const screenHeight = io.DisplaySize.y;
+	auto const logoWidth    = subTex->width / io.DisplayFramebufferScale.x;
+	auto const logoHeight   = subTex->height / io.DisplayFramebufferScale.y;
+
+	auto const x1 = (screenWidth - logoWidth) / 2.0f;
+	auto const x2 = x1 + logoWidth;
+	auto const y1 = (screenHeight / 2.0f - logoHeight) / 2.0f;
+	auto const y2 = y1 + logoHeight;
+
+	auto const uv1 = ImVec2 (subTex->left, subTex->top);
+	auto const uv2 = ImVec2 (subTex->right, subTex->bottom);
+
+	ImGui::GetBackgroundDrawList ()->AddImage (
+	    &s_gfxTexture, ImVec2 (x1, y1), ImVec2 (x2, y2), uv1, uv2);
+
+	ImGui::GetBackgroundDrawList ()->AddImage (&s_gfxTexture,
+	    ImVec2 (x1, y1 + screenHeight / 2.0f),
+	    ImVec2 (x2, y2 + screenHeight / 2.0f),
+	    uv1,
+	    uv2);
+}
+
+void drawStatus ()
+{
+	constexpr unsigned batteryLevels[] = {
+	    gfx_battery0_idx,
+	    gfx_battery0_idx,
+	    gfx_battery1_idx,
+	    gfx_battery2_idx,
+	    gfx_battery3_idx,
+	    gfx_battery4_idx,
+	};
+
+	constexpr unsigned wifiLevels[] = {
+	    gfx_wifiNull_idx,
+	    gfx_wifi1_idx,
+	    gfx_wifi2_idx,
+	    gfx_wifi3_idx,
+	};
+
+	static u8 charging = 0;
+	static u8 level    = 5;
+	PTMU_GetBatteryChargeState (&charging);
+	if (!charging)
+	{
+		PTMU_GetBatteryLevel (&level);
+		if (level >= std::extent_v<decltype (batteryLevels)>)
+			svcBreak (USERBREAK_PANIC);
+	}
+
+	auto const &io    = ImGui::GetIO ();
+	auto const &style = ImGui::GetStyle ();
+
+	auto const screenWidth = io.DisplaySize.x;
+
+	auto const battery =
+	    Tex3DS_GetSubTexture (s_gfxT3x, charging ? gfx_batteryCharge_idx : batteryLevels[level]);
+	auto const batteryWidth  = battery->width / io.DisplayFramebufferScale.x;
+	auto const batteryHeight = battery->height / io.DisplayFramebufferScale.y;
+
+	auto const p1 = ImVec2 (screenWidth - batteryWidth, 0.0f);
+	auto const p2 = ImVec2 (screenWidth, batteryHeight);
+
+	auto const uv1 = ImVec2 (battery->left, battery->top);
+	auto const uv2 = ImVec2 (battery->right, battery->bottom);
+
+	ImGui::GetForegroundDrawList ()->AddImage (&s_gfxTexture, p1, p2, uv1, uv2);
+
+	auto const wifiStrength = osGetWifiStrength ();
+
+	auto const wifi       = Tex3DS_GetSubTexture (s_gfxT3x, wifiLevels[wifiStrength]);
+	auto const wifiWidth  = wifi->width / io.DisplayFramebufferScale.x;
+	auto const wifiHeight = wifi->height / io.DisplayFramebufferScale.y;
+
+	auto const p3 = ImVec2 (p1.x - wifiWidth - 4.0f, 0.0f);
+	auto const p4 = ImVec2 (p1.x - 4.0f, wifiHeight);
+
+	auto const uv3 = ImVec2 (wifi->left, wifi->top);
+	auto const uv4 = ImVec2 (wifi->right, wifi->bottom);
+
+	ImGui::GetForegroundDrawList ()->AddImage (&s_gfxTexture, p3, p4, uv3, uv4);
+
+	char buffer[64];
+	auto const now = std::time (nullptr);
+	std::strftime (buffer, sizeof (buffer), "%H:%M:%S", std::localtime (&now));
+	ImGui::GetForegroundDrawList ()->AddText (
+	    ImVec2 (p3.x - 130.0f, style.FramePadding.y), 0xFFFFFFFF, buffer);
+}
+}
+
+bool platform::init ()
+{
+	osSetSpeedupEnable (true);
+
+	acInit ();
+	ptmuInit ();
+	romfsInit ();
+	gfxInitDefault ();
+	gfxSet3D (false);
+	sdmcWriteSafe (false);
+
+#ifndef NDEBUG
+	consoleDebugInit (debugDevice_SVC);
+	std::setvbuf (stderr, nullptr, _IOLBF, 0);
+#endif
+
+	IMGUI_CHECKVERSION ();
+	ImGui::CreateContext ();
+
+	if (!imgui::ctru::init ())
+	{
+		ImGui::DestroyContext ();
+		return false;
+	}
+
+	imgui::citro3d::init ();
+
+	{
+		fs::File file;
+		if (!file.open ("romfs:/gfx.t3x"))
+			svcBreak (USERBREAK_PANIC);
+
+		s_gfxT3x = Tex3DS_TextureImportStdio (file, &s_gfxTexture, nullptr, true);
+		if (!s_gfxT3x)
+			svcBreak (USERBREAK_PANIC);
+	}
+
+	C3D_TexSetFilter (&s_gfxTexture, GPU_LINEAR, GPU_LINEAR);
+
+	return true;
+}
+
+bool platform::loop ()
+{
+	if (!aptMainLoop ())
+		return false;
+
+	startNetwork ();
+
+	hidScanInput ();
+
+	if (hidKeysDown () & KEY_START)
+		return false;
+
+	imgui::ctru::newFrame ();
+	imgui::citro3d::newFrame ();
+	ImGui::NewFrame ();
+
+	return true;
+}
+
+void platform::render ()
+{
+	drawLogo ();
+	drawStatus ();
+
+	ImGui::Render ();
+
+	imgui::citro3d::render ();
+}
+
+void platform::exit ()
+{
+	Tex3DS_TextureFree (s_gfxT3x);
+	C3D_TexDelete (&s_gfxTexture);
+
+	ImGui::DestroyContext ();
+
+	imgui::citro3d::exit ();
+	imgui::ctru::exit ();
+
+	socExit ();
+	s_socuActive = false;
+	std::free (s_socuBuffer);
+
+	gfxExit ();
+	ptmuExit ();
+	acExit ();
+}
+
+///////////////////////////////////////////////////////////////////////////
+class platform::Thread::privateData_t
+{
+public:
+	privateData_t ()
+	{
+		if (thread)
+			threadFree (thread);
+	}
+
+	privateData_t (std::function<void ()> func_) : thread (nullptr)
+	{
+		s32 priority = 0x30;
+		svcGetThreadPriority (&priority, CUR_THREAD_HANDLE);
+
+		thread = threadCreate (&privateData_t::threadFunc, this, STACK_SIZE, priority, -1, false);
+		assert (thread);
+	}
+
+	static void threadFunc (void *const arg_)
+	{
+		auto const t = static_cast<privateData_t *> (arg_);
+		t->func ();
+	}
+
+	::Thread thread = nullptr;
+	std::function<void ()> func;
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Thread::~Thread () = default;
+
+platform::Thread::Thread () : m_d (new privateData_t ())
+{
+}
+
+platform::Thread::Thread (std::function<void ()> func_) : m_d (new privateData_t (func_))
+{
+}
+
+platform::Thread::Thread (Thread &&that_) : m_d (new privateData_t ())
+{
+	std::swap (m_d, that_.m_d);
+}
+
+platform::Thread &platform::Thread::operator= (Thread &&that_)
+{
+	std::swap (m_d, that_.m_d);
+	return *this;
+}
+
+void platform::Thread::join ()
+{
+	threadJoin (m_d->thread, UINT64_MAX);
+}
+
+void platform::Thread::sleep (std::chrono::milliseconds const timeout_)
+{
+	svcSleepThread (std::chrono::nanoseconds (timeout_).count ());
+}
+
+///////////////////////////////////////////////////////////////////////////
+class platform::Mutex::privateData_t
+{
+public:
+	LightLock mutex;
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Mutex::~Mutex () = default;
+
+platform::Mutex::Mutex () : m_d (new privateData_t ())
+{
+	LightLock_Init (&m_d->mutex);
+}
+
+void platform::Mutex::lock ()
+{
+	LightLock_Lock (&m_d->mutex);
+}
+
+void platform::Mutex::unlock ()
+{
+	LightLock_Unlock (&m_d->mutex);
+}

source/3ds/vshader.v.pica

@@ -0,0 +1,61 @@
+; ftpd is a server implementation based on the following:
+; - RFC  959 (https://tools.ietf.org/html/rfc959)
+; - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+; - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+; 
+; Copyright (C) 2020 Michael Theall
+; 
+; This program is free software: you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation, either version 3 of the License, or
+; (at your option) any later version.
+; 
+; This program is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; GNU General Public License for more details.
+; 
+; You should have received a copy of the GNU General Public License
+; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+; Example PICA200 vertex shader
+
+; Uniforms
+.fvec proj[4]
+
+; Constants
+.constf constants(1.0, 0.0, 0.00392156862745, 0.0)
+
+; Outputs
+.out outPos   position
+.out outUv    texcoord0
+.out outColor color
+
+; Inputs (defined as aliases for convenience)
+.alias inPos   v0
+.alias inUv    v1
+.alias inColor v2
+
+.proc main
+	; Force inPos.z = 0.0, inPos.w = 1.0
+	mov r0.xy, inPos.xy
+	mov r0.zw, constants.yx
+
+	; outPos = proj * inPos
+	dp4 outPos.x, proj[0], r0
+	dp4 outPos.y, proj[1], r0
+	dp4 outPos.z, proj[2], r0
+	dp4 outPos.w, proj[3], r0
+
+	; outUv = inUv
+	mov outUv, inUv
+
+	; normalize inColor
+	mul r1, constants.zzzz, inColor
+
+	; outColor = inColor
+	mov outColor, r1
+
+	; We're finished
+	end
+.end

source/console.c

@@ -1,276 +0,0 @@
-#include "console.h"
-#include <arpa/inet.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef _3DS
-#include <3ds.h>
-#define CONSOLE_WIDTH 50
-#define CONSOLE_HEIGHT 30
-#elif defined(__SWITCH__)
-#include <switch.h>
-#define CONSOLE_WIDTH 80
-#define CONSOLE_HEIGHT 45
-#endif
-
-#if defined(_3DS) || defined (__SWITCH__)
-static PrintConsole status_console;
-static PrintConsole main_console;
-#endif
-
-#if ENABLE_LOGGING
-static bool disable_logging = false;
-#endif
-
-#if defined(_3DS)
-static PrintConsole tcp_console;
-
-/*! initialize console subsystem */
-void
-console_init(void)
-{
-  consoleInit(GFX_TOP, &status_console);
-  consoleSetWindow(&status_console, 0, 0, 50, 1);
-
-  consoleInit(GFX_TOP, &main_console);
-  consoleSetWindow(&main_console, 0, 1, 50, 29);
-
-  consoleInit(GFX_BOTTOM, &tcp_console);
-
-  consoleSelect(&main_console);
-}
-
-
-/*! print tcp tables */
-static void
-print_tcp_table(void)
-{
-  static SOCU_TCPTableEntry tcp_entries[32];
-  socklen_t                 optlen;
-  size_t                    i;
-  int                       rc, lines = 0;
-
-#ifdef ENABLE_LOGGING
-  disable_logging = true;
-#endif
-
-  consoleSelect(&tcp_console);
-  console_print("\x1b[0;0H\x1b[K");
-  optlen = sizeof(tcp_entries);
-  rc = SOCU_GetNetworkOpt(SOL_CONFIG, NETOPT_TCP_TABLE, tcp_entries, &optlen);
-  if(rc != 0 && errno != ENODEV)
-    console_print(RED "tcp table: %d %s\n\x1b[J\n" RESET, errno, strerror(errno));
-  else if(rc == 0)
-  {
-    for(i = 0; lines < 30 && i < optlen / sizeof(SOCU_TCPTableEntry); ++i)
-    {
-      SOCU_TCPTableEntry *entry  = &tcp_entries[i];
-      struct sockaddr_in *local  = (struct sockaddr_in*)&entry->local;
-      struct sockaddr_in *remote = (struct sockaddr_in*)&entry->remote;
-
-      console_print(GREEN "%stcp[%zu]: ", i == 0 ? "" : "\n", i);
-      switch(entry->state)
-      {
-        case TCP_STATE_CLOSED:
-          console_print("CLOSED\x1b[K");
-          local = remote = NULL;
-          break;
-
-        case TCP_STATE_LISTEN:
-          console_print("LISTEN\x1b[K");
-          remote = NULL;
-          break;
-
-        case TCP_STATE_ESTABLISHED:
-          console_print("ESTABLISHED\x1b[K");
-          break;
-
-        case TCP_STATE_FINWAIT1:
-          console_print("FINWAIT1\x1b[K");
-          break;
-
-        case TCP_STATE_FINWAIT2:
-          console_print("FINWAIT2\x1b[K");
-          break;
-
-        case TCP_STATE_CLOSE_WAIT:
-          console_print("CLOSE_WAIT\x1b[K");
-          break;
-
-        case TCP_STATE_LAST_ACK:
-          console_print("LAST_ACK\x1b[K");
-          break;
-
-        case TCP_STATE_TIME_WAIT:
-          console_print("TIME_WAIT\x1b[K");
-          break;
-
-        default:
-          console_print("State %lu\x1b[K", entry->state);
-          break;
-      }
-
-      ++lines;
-
-      if(local && (lines++ < 30))
-        console_print("\n Local %s:%u\x1b[K", inet_ntoa(local->sin_addr),
-                                 ntohs(local->sin_port));
-
-      if(remote && (lines++ < 30))
-        console_print("\n Peer  %s:%u\x1b[K", inet_ntoa(remote->sin_addr),
-                                  ntohs(remote->sin_port));
-    }
-
-    console_print(RESET "\x1b[J");
-  }
-  else
-    console_print("\x1b[2J");
-
-  consoleSelect(&main_console);
-
-#ifdef ENABLE_LOGGING
-  disable_logging = false;
-#endif
-}
-
-#elif defined(__SWITCH__)
-/*! initialize console subsystem */
-void
-console_init(void)
-{
-  consoleInit(&status_console);
-  consoleSetWindow(&status_console, 0, 0, CONSOLE_WIDTH, 1);
-
-  consoleInit( &main_console);
-  consoleSetWindow(&main_console, 0, 1, CONSOLE_WIDTH, CONSOLE_HEIGHT-1);
-
-  consoleSelect(&main_console);
-}
-#endif
-
-#if defined(_3DS) || defined(__SWITCH__)
-
-
-/*! set status bar contents
- *
- *  @param[in] fmt format string
- *  @param[in] ... format arguments
- */
-void
-console_set_status(const char *fmt, ...)
-{
-  va_list ap;
-
-  consoleSelect(&status_console);
-  va_start(ap, fmt);
-  vprintf(fmt, ap);
-#ifdef ENABLE_LOGGING
-  vfprintf(stderr, fmt, ap);
-#endif
-  va_end(ap);
-  consoleSelect(&main_console);
-}
-
-/*! add text to the console
- *
- *  @param[in] fmt format string
- *  @param[in] ... format arguments
- */
-void
-console_print(const char *fmt, ...)
-{
-  va_list ap;
-
-  va_start(ap, fmt);
-  vprintf(fmt, ap);
-#ifdef ENABLE_LOGGING
-  if(!disable_logging)
-    vfprintf(stderr, fmt, ap);
-#endif
-  va_end(ap);
-}
-
-/*! print debug message
- *
- *  @param[in] fmt format string
- *  @param[in] ... format arguments
- */
-void
-debug_print(const char *fmt, ...)
-{
-#ifdef ENABLE_LOGGING
-  va_list ap;
-
-  va_start(ap, fmt);
-  vfprintf(stderr, fmt, ap);
-  va_end(ap);
-#endif
-}
-
-/*! draw console to screen */
-void
-console_render(void)
-{
-  /* print tcp table */
-#ifdef _3DS
-  print_tcp_table();
-#endif
-  /* flush framebuffer */
-#ifdef _3DS
-  gfxFlushBuffers();
-  gspWaitForVBlank();
-  gfxSwapBuffers();
-#endif
-#ifdef __SWITCH__
-  consoleUpdate(NULL);
-#endif
-}
-
-
-#else
-
-/* this is a lot easier when you have a real console */
-
-void
-console_init(void)
-{
-}
-
-void
-console_set_status(const char *fmt, ...)
-{
-  va_list ap;
-  va_start(ap, fmt);
-  vprintf(fmt, ap);
-  va_end(ap);
-  fputc('\n', stdout);
-}
-
-void
-console_print(const char *fmt, ...)
-{
-  va_list ap;
-  va_start(ap, fmt);
-  vprintf(fmt, ap);
-  va_end(ap);
-}
-
-void
-debug_print(const char *fmt, ...)
-{
-#ifdef ENABLE_LOGGING
-  va_list ap;
-  va_start(ap, fmt);
-  vfprintf(stderr, fmt, ap);
-  va_end(ap);
-#endif
-}
-
-void console_render(void)
-{
-}
-#endif
-

source/fs.cpp

@@ -0,0 +1,211 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "fs.h"
+
+#include <cinttypes>
+#include <cstdio>
+
+std::string fs::printSize (std::uint64_t const size_)
+{
+	constexpr std::uint64_t const KiB = 1024;
+	constexpr std::uint64_t const MiB = 1024 * KiB;
+	constexpr std::uint64_t const GiB = 1024 * MiB;
+	constexpr std::uint64_t const TiB = 1024 * GiB;
+	constexpr std::uint64_t const PiB = 1024 * TiB;
+	constexpr std::uint64_t const EiB = 1024 * PiB;
+
+	char buffer[64] = {};
+
+	for (auto const &[name, bin] : {
+	         // clang-format off
+	         std::make_pair ("EiB", EiB),
+	         std::make_pair ("PiB", PiB),
+	         std::make_pair ("TiB", TiB),
+	         std::make_pair ("GiB", GiB),
+	         std::make_pair ("MiB", MiB),
+	         std::make_pair ("KiB", KiB)
+	         // clang-format on
+	     })
+	{
+		auto const whole = size_ / bin;
+		if (size_ >= 100 * bin)
+		{
+			std::sprintf (buffer, "%" PRIu64 "%s", whole, name);
+			return buffer;
+		}
+
+		auto const frac = size_ - whole * bin;
+		if (size_ >= 10 * bin)
+		{
+			std::sprintf (buffer, "%" PRIu64 ".%" PRIu64 "%s", whole, frac * 10 / bin, name);
+			return buffer;
+		}
+
+		if (size_ >= 1000 * (bin / KiB))
+		{
+			std::sprintf (buffer, "%" PRIu64 ".%02" PRIu64 "%s", whole, frac * 100 / bin, name);
+			return buffer;
+		}
+	}
+
+	std::sprintf (buffer, "%" PRIu64, size_);
+	return buffer;
+}
+
+///////////////////////////////////////////////////////////////////////////
+fs::File::~File () = default;
+
+fs::File::File () = default;
+
+fs::File::File (File &&that_) = default;
+
+fs::File &fs::File::operator= (File &&that_) = default;
+
+fs::File::operator bool () const
+{
+	return static_cast<bool> (m_fp);
+}
+
+fs::File::operator FILE * () const
+{
+	return m_fp.get ();
+}
+
+void fs::File::setBufferSize (std::size_t const size_)
+{
+	if (m_bufferSize != size_)
+	{
+		m_buffer     = std::make_unique<char[]> (size_);
+		m_bufferSize = size_;
+	}
+
+	if (m_fp)
+		std::setvbuf (m_fp.get (), m_buffer.get (), _IOFBF, m_bufferSize);
+}
+
+bool fs::File::open (char const *const path_, char const *const mode_)
+{
+	auto const fp = std::fopen (path_, mode_);
+	if (!fp)
+		return false;
+
+	m_fp = std::unique_ptr<std::FILE, int (*) (std::FILE *)> (fp, &std::fclose);
+
+	if (m_buffer)
+		std::setvbuf (m_fp.get (), m_buffer.get (), _IOFBF, m_bufferSize);
+
+	return true;
+}
+
+void fs::File::close ()
+{
+	m_fp.reset ();
+}
+
+ssize_t fs::File::seek (std::size_t const pos_, int const origin_)
+{
+	return std::fseek (m_fp.get (), pos_, origin_);
+}
+
+ssize_t fs::File::read (void *const data_, std::size_t const size_)
+{
+	return std::fread (data_, 1, size_, m_fp.get ());
+}
+
+bool fs::File::readAll (void *const data_, std::size_t const size_)
+{
+	auto p            = static_cast<char *> (data_);
+	std::size_t bytes = 0;
+
+	while (bytes < size_)
+	{
+		auto const rc = read (p, size_ - bytes);
+		if (rc <= 0)
+			return false;
+
+		p += rc;
+		bytes += rc;
+	}
+
+	return true;
+}
+
+ssize_t fs::File::write (void const *const data_, std::size_t const size_)
+{
+	return std::fwrite (data_, 1, size_, m_fp.get ());
+}
+
+bool fs::File::writeAll (void const *const data_, std::size_t const size_)
+{
+	auto p            = static_cast<char const *> (data_);
+	std::size_t bytes = 0;
+
+	while (bytes < size_)
+	{
+		auto const rc = write (p, size_ - bytes);
+		if (rc <= 0)
+			return false;
+
+		p += rc;
+		bytes += rc;
+	}
+
+	return true;
+}
+
+///////////////////////////////////////////////////////////////////////////
+fs::Dir::~Dir () = default;
+
+fs::Dir::Dir () = default;
+
+fs::Dir::Dir (Dir &&that_) = default;
+
+fs::Dir &fs::Dir::operator= (Dir &&that_) = default;
+
+fs::Dir::operator bool () const
+{
+	return static_cast<bool> (m_dp);
+}
+
+fs::Dir::operator DIR * () const
+{
+	return m_dp.get ();
+}
+
+bool fs::Dir::open (char const *const path_)
+{
+	auto const dp = ::opendir (path_);
+	if (!dp)
+		return false;
+
+	m_dp = std::unique_ptr<DIR, int (*) (DIR *)> (dp, &::closedir);
+	return true;
+}
+
+void fs::Dir::close ()
+{
+	m_dp.reset ();
+}
+
+struct dirent *fs::Dir::read ()
+{
+	return ::readdir (m_dp.get ());
+}

source/ftpServer.cpp

@@ -0,0 +1,253 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "ftpServer.h"
+
+#include "fs.h"
+
+#include "imgui.h"
+
+#include <arpa/inet.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include <chrono>
+#include <cstdio>
+#include <cstring>
+#include <mutex>
+#include <thread>
+using namespace std::chrono_literals;
+
+#ifndef _3DS
+#define MULTITHREADED 1
+#else
+#define MULTITHREADED 0
+#endif
+
+namespace
+{
+auto const s_startTime = std::chrono::system_clock::to_time_t (std::chrono::system_clock::now ());
+platform::Mutex s_lock;
+std::string s_freeSpace;
+}
+
+///////////////////////////////////////////////////////////////////////////
+FtpServer::~FtpServer ()
+{
+	m_quit = true;
+
+	m_thread.join ();
+}
+
+FtpServer::FtpServer (std::uint16_t const port_)
+    : m_log (Log::create ()), m_port (port_), m_quit (false)
+{
+	Log::bind (m_log);
+
+	handleStartButton ();
+
+#if MULTITHREADED
+	m_thread = platform::Thread (std::bind (&FtpServer::threadFunc, this));
+#endif
+}
+
+void FtpServer::draw ()
+{
+#if !MULTITHREADED
+	loop ();
+#endif
+
+	ImGuiIO &io       = ImGui::GetIO ();
+	auto const width  = io.DisplaySize.x;
+	auto const height = io.DisplaySize.y;
+
+	ImGui::SetNextWindowPos (ImVec2 (0, 0), ImGuiCond_FirstUseEver);
+#ifdef _3DS
+	// top screen
+	ImGui::SetNextWindowSize (ImVec2 (width, height / 2.0f));
+#else
+	ImGui::SetNextWindowSize (ImVec2 (width, height));
+#endif
+	ImGui::Begin (STATUS_STRING,
+	    nullptr,
+	    ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
+
+	{
+		auto const lock = std::scoped_lock (m_lock);
+		if (!m_socket)
+		{
+			if (ImGui::Button ("Start"))
+				handleStartButton ();
+		}
+		else if (ImGui::Button ("Stop"))
+			handleStopButton ();
+
+		if (m_socket)
+		{
+			ImGui::SameLine ();
+			ImGui::TextUnformatted (m_name.c_str ());
+		}
+	}
+
+	{
+		auto const lock = std::scoped_lock (s_lock);
+		if (!s_freeSpace.empty ())
+		{
+			ImGui::SameLine ();
+			ImGui::TextUnformatted (s_freeSpace.c_str ());
+		}
+	}
+
+	ImGui::Separator ();
+
+#ifdef _3DS
+	ImGui::BeginChild ("Logs", ImVec2 (0, 0), false, ImGuiWindowFlags_HorizontalScrollbar);
+#else
+	ImGui::BeginChild ("Logs", ImVec2 (0, 200), false, ImGuiWindowFlags_HorizontalScrollbar);
+#endif
+	m_log->draw ();
+	ImGui::EndChild ();
+
+#ifdef _3DS
+	ImGui::End ();
+
+	// bottom screen
+	ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height / 2.0f));
+	ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height / 2.0f), ImGuiCond_FirstUseEver);
+	ImGui::Begin ("Sessions",
+	    nullptr,
+	    ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
+#else
+	ImGui::Separator ();
+#endif
+
+	for (auto &session : m_sessions)
+		session->draw ();
+
+	ImGui::End ();
+}
+
+UniqueFtpServer FtpServer::create (std::uint16_t const port_)
+{
+	updateFreeSpace ();
+	return UniqueFtpServer (new FtpServer (port_));
+}
+
+void FtpServer::updateFreeSpace ()
+{
+#if defined(_3DS) || defined(__SWITCH__)
+	struct statvfs st;
+	if (::statvfs ("sdmc:/", &st) != 0)
+		return;
+
+	auto const lock = std::scoped_lock (s_lock);
+	s_freeSpace     = fs::printSize (static_cast<std::uint64_t> (st.f_bsize) * st.f_bfree);
+#endif
+}
+
+std::time_t FtpServer::startTime ()
+{
+	return s_startTime;
+}
+
+void FtpServer::handleStartButton ()
+{
+	if (m_socket)
+		return;
+
+	struct sockaddr_in addr;
+	addr.sin_family = AF_INET;
+#if defined(_3DS) || defined(__SWITCH__)
+	addr.sin_addr.s_addr = gethostid ();
+#else
+	addr.sin_addr.s_addr = INADDR_ANY;
+#endif
+	addr.sin_port = htons (m_port);
+
+	auto socket = Socket::create ();
+	if (!socket)
+		return;
+
+	if (m_port != 0 && !socket->setReuseAddress (true))
+		return;
+
+	if (!socket->bind (addr))
+		return;
+
+	if (!socket->listen (10))
+		return;
+
+	auto const &sockName = socket->sockName ();
+	auto const name      = sockName.name ();
+
+	m_name.resize (std::strlen (name) + 3 + 5);
+	m_name.resize (std::sprintf (&m_name[0], "[%s]:%u", name, sockName.port ()));
+
+	Log::info ("Started server at %s\n", m_name.c_str ());
+
+	m_socket = std::move (socket);
+}
+
+void FtpServer::handleStopButton ()
+{
+	m_socket.reset ();
+	Log::info ("Stopped server at %s\n", m_name.c_str ());
+}
+
+void FtpServer::loop ()
+{
+	{
+		auto const lock = std::scoped_lock (m_lock);
+		if (m_socket)
+		{
+			Socket::PollInfo info{*m_socket, POLLIN, 0};
+			if (Socket::poll (&info, 1, 0ms) > 0)
+			{
+				auto socket = m_socket->accept ();
+				if (socket)
+					m_sessions.emplace_back (FtpSession::create (std::move (socket)));
+			}
+		}
+	}
+
+	for (auto it = std::begin (m_sessions); it != std::end (m_sessions);)
+	{
+		auto const &session = *it;
+		if (session->dead ())
+			it = m_sessions.erase (it);
+		else
+			++it;
+	}
+
+	if (!m_sessions.empty ())
+		FtpSession::poll (m_sessions);
+#if MULTITHREADED
+	else
+		platform::Thread::sleep (16ms);
+#endif
+}
+
+void FtpServer::threadFunc ()
+{
+	Log::bind (m_log);
+
+	while (!m_quit)
+		loop ();
+}

source/imgui/imgui.cpp

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imgui_draw.cpp

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imgui_internal.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imgui_widgets.cpp

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imstb_rectpack.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imstb_textedit.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/imgui/imstb_truetype.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui/releases/tag/v1.75"

source/ioBuffer.cpp

@@ -0,0 +1,107 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "ioBuffer.h"
+
+#include <cassert>
+#include <cstring>
+
+///////////////////////////////////////////////////////////////////////////
+IOBuffer::~IOBuffer () = default;
+
+IOBuffer::IOBuffer (std::size_t const size_)
+    : m_buffer (std::make_unique<char[]> (size_)), m_size (size_)
+{
+}
+
+char *IOBuffer::freeArea () const
+{
+	assert (m_end < m_size);
+	return &m_buffer[m_end];
+}
+
+std::size_t IOBuffer::freeSize () const
+{
+	assert (m_size >= m_end);
+	return m_size - m_end;
+}
+
+void IOBuffer::markFree (std::size_t size_)
+{
+	assert (m_end >= m_start);
+	assert (m_end - m_start >= size_);
+	m_start += size_;
+
+	// reset back to beginning
+	if (m_start == m_end)
+	{
+		m_start = 0;
+		m_end   = 0;
+	}
+}
+
+char *IOBuffer::usedArea () const
+{
+	assert (m_start < m_size);
+	return &m_buffer[m_start];
+}
+
+std::size_t IOBuffer::usedSize () const
+{
+	assert (m_end >= m_start);
+	return m_end - m_start;
+}
+
+void IOBuffer::markUsed (std::size_t size_)
+{
+	assert (m_size >= m_end);
+	assert (m_size - m_end >= size_);
+	m_end += size_;
+}
+
+bool IOBuffer::empty () const
+{
+	assert (m_end >= m_start);
+	return (m_end - m_start) == 0;
+}
+
+std::size_t IOBuffer::capacity () const
+{
+	return m_size;
+}
+
+void IOBuffer::clear ()
+{
+	m_start = 0;
+	m_end   = 0;
+}
+
+void IOBuffer::coalesce ()
+{
+	assert (m_size >= m_end);
+	assert (m_end >= m_start);
+
+	auto const size = m_end - m_start;
+	if (size != 0)
+		std::memmove (&m_buffer[0], &m_buffer[m_start], size);
+
+	m_end -= m_start;
+	m_start = 0;
+}

source/log.cpp

@@ -0,0 +1,196 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "log.h"
+
+#include "imgui.h"
+
+#include <mutex>
+
+namespace
+{
+#ifdef _3DS
+constexpr auto MAX_LOGS = 250;
+#else
+constexpr auto MAX_LOGS = 10000;
+#endif
+thread_local WeakLog s_log;
+
+static char const *const s_prefix[] = {
+    [Log::DEBUG]    = "[DEBUG]",
+    [Log::INFO]     = "[INFO]",
+    [Log::ERROR]    = "[ERROR]",
+    [Log::COMMAND]  = "[COMMAND]",
+    [Log::RESPONSE] = "[RESPONSE]",
+};
+}
+
+///////////////////////////////////////////////////////////////////////////
+Log::~Log () = default;
+
+Log::Log () = default;
+
+void Log::draw ()
+{
+	auto const lock = std::scoped_lock (m_lock);
+
+	if (m_messages.size () > MAX_LOGS)
+	{
+		auto const begin = std::begin (m_messages);
+		auto const end   = std::next (begin, m_messages.size () - MAX_LOGS);
+		m_messages.erase (begin, end);
+	}
+
+	static ImVec4 const s_colors[] = {
+	    [Log::DEBUG]    = ImVec4 (1.0f, 1.0f, 0.4f, 1.0f),
+	    [Log::INFO]     = ImVec4 (1.0f, 1.0f, 1.0f, 1.0f),
+	    [Log::ERROR]    = ImVec4 (1.0f, 0.4f, 0.4f, 1.0f),
+	    [Log::COMMAND]  = ImVec4 (0.4f, 1.0f, 0.4f, 1.0f),
+	    [Log::RESPONSE] = ImVec4 (0.4f, 1.0f, 1.0f, 1.0f),
+	};
+
+	static char const *const s_prefix[] = {
+	    [Log::DEBUG]    = "[DEBUG]",
+	    [Log::INFO]     = "[INFO]",
+	    [Log::ERROR]    = "[ERROR]",
+	    [Log::COMMAND]  = "[COMMAND]",
+	    [Log::RESPONSE] = "[RESPONSE]",
+	};
+
+	for (auto const &message : m_messages)
+	{
+		ImGui::PushStyleColor (ImGuiCol_Text, s_colors[message.level]);
+		ImGui::TextUnformatted (s_prefix[message.level]);
+		ImGui::SameLine ();
+		ImGui::TextUnformatted (message.message.c_str ());
+		ImGui::PopStyleColor ();
+	}
+
+	// auto scroll if scroll bar is at end
+	if (ImGui::GetScrollY () >= ImGui::GetScrollMaxY ())
+		ImGui::SetScrollHereY (1.0f);
+}
+
+SharedLog Log::create ()
+{
+	return std::shared_ptr<Log> (new Log ());
+}
+
+void Log::bind (SharedLog log_)
+{
+	s_log = log_;
+}
+
+void Log::debug (char const *const fmt_, ...)
+{
+#ifndef NDEBUG
+	va_list ap;
+
+	va_start (ap, fmt_);
+	log (DEBUG, fmt_, ap);
+	va_end (ap);
+#endif
+}
+
+void Log::info (char const *const fmt_, ...)
+{
+	va_list ap;
+
+	va_start (ap, fmt_);
+	log (INFO, fmt_, ap);
+	va_end (ap);
+}
+
+void Log::error (char const *const fmt_, ...)
+{
+	va_list ap;
+
+	va_start (ap, fmt_);
+	log (ERROR, fmt_, ap);
+	va_end (ap);
+}
+
+void Log::command (char const *const fmt_, ...)
+{
+	va_list ap;
+
+	va_start (ap, fmt_);
+	log (COMMAND, fmt_, ap);
+	va_end (ap);
+}
+
+void Log::response (char const *const fmt_, ...)
+{
+	va_list ap;
+
+	va_start (ap, fmt_);
+	log (RESPONSE, fmt_, ap);
+	va_end (ap);
+}
+
+void Log::log (Level const level_, char const *const fmt_, va_list ap_)
+{
+#ifdef NDEBUG
+	if (level_ == DEBUG)
+		return;
+#endif
+
+	auto log = s_log.lock ();
+	if (!log)
+		return;
+
+	thread_local static char buffer[1024];
+
+	std::vsnprintf (buffer, sizeof (buffer), fmt_, ap_);
+	buffer[sizeof (buffer) - 1] = '\0';
+
+	auto const lock = std::scoped_lock (log->m_lock);
+#ifndef NDEBUG
+	std::fprintf (stderr, "%s", s_prefix[level_]);
+	std::fputs (buffer, stderr);
+#endif
+	log->m_messages.emplace_back (level_, buffer);
+}
+
+void Log::log (Level const level_, std::string_view const message_)
+{
+#ifdef NDEBUG
+	if (level_ == DEBUG)
+		return;
+#endif
+
+	auto log = s_log.lock ();
+	if (!log)
+		return;
+
+	auto msg = std::string (message_);
+	for (auto &c : msg)
+	{
+		if (c == '\0')
+			c = '?';
+	}
+
+	auto const lock = std::scoped_lock (log->m_lock);
+#ifndef NDEBUG
+	std::fprintf (stderr, "%s", s_prefix[level_]);
+	std::fwrite (msg.data (), 1, msg.size (), stderr);
+#endif
+	log->m_messages.emplace_back (level_, msg);
+}

source/main.c

@@ -1,182 +0,0 @@
-
-#include <errno.h>
-#include <malloc.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <unistd.h>
-#ifdef _3DS
-#include <3ds.h>
-#elif defined(__SWITCH__)
-#include <switch.h>
-#endif
-#include "console.h"
-#include "ftp.h"
-
-/*! looping mechanism
- *
- *  @param[in] callback function to call during each iteration
- *
- *  @returns loop status
- */
-static loop_status_t
-loop(loop_status_t (*callback)(void))
-{
-  loop_status_t status = LOOP_CONTINUE;
-
-#ifdef _3DS
-  while(aptMainLoop())
-  {
-    status = callback();
-    console_render();
-    if(status != LOOP_CONTINUE)
-      return status;
-  }
-  return LOOP_EXIT;
-#elif defined(__SWITCH__)
-  while(appletMainLoop())
-  {
-    console_render();
-    status = callback();
-    if(status != LOOP_CONTINUE)
-      return status;
-  }
-  return LOOP_EXIT;
-#else
-  while(status == LOOP_CONTINUE)
-    status = callback();
-  return status;
-#endif
-}
-
-#ifdef _3DS
-/*! wait until the B button is pressed
- *
- *  @returns loop status
- */
-static loop_status_t
-wait_for_b(void)
-{
-  /* update button state */
-  hidScanInput();
-
-  /* check if B was pressed */
-  if(hidKeysDown() & KEY_B)
-    return LOOP_EXIT;
-
-  /* B was not pressed */
-  return LOOP_CONTINUE;
-}
-#elif defined(__SWITCH__)
-/*! wait until the B button is pressed
- *
- *  @returns loop status
- */
-static loop_status_t
-wait_for_b(void)
-{
-  /* update button state */
-  hidScanInput();
-
-  /* check if B was pressed */
-  if(hidKeysDown(CONTROLLER_P1_AUTO) & KEY_B)
-    return LOOP_EXIT;
-
-  /* B was not pressed */
-  return LOOP_CONTINUE;
-}
-#endif
-
-/*! entry point
- *
- *  @param[in] argc unused
- *  @param[in] argv unused
- *
- *  returns exit status
- */
-int
-main(int  argc,
-     char *argv[])
-{
-  loop_status_t status = LOOP_RESTART;
-
-#ifdef _3DS
-  /* initialize needed 3DS services */
-  acInit();
-  gfxInitDefault();
-  gfxSet3D(false);
-  sdmcWriteSafe(false);
-#elif defined(__SWITCH__)
-  /* initialize needed Switch services */
-  nifmInitialize(NifmServiceType_User);
-#endif
-
-  /* initialize console subsystem */
-  console_init();
-
-#ifdef ENABLE_LOGGING
-  /* open log file */
-#ifdef _3DS
-  FILE *fp = freopen("/ftpd.log", "wb", stderr);
-#else
-  FILE *fp = freopen("ftpd.log", "wb", stderr);
-#endif
-  if(fp == NULL)
-  {
-    console_print(RED "freopen: 0x%08X\n" RESET, errno);
-    goto log_fail;
-  }
-
-  /* truncate log file */
-  if(ftruncate(fileno(fp), 0) != 0)
-  {
-    console_print(RED "ftruncate: 0x%08X\n" RESET, errno);
-    goto log_fail;
-  }
-#endif
-
-  console_set_status("\n" GREEN STATUS_STRING
-#ifdef ENABLE_LOGGING
-                     " DEBUG"
-#endif
-                     RESET);
-
-  while(status == LOOP_RESTART)
-  {
-    /* initialize ftp subsystem */
-    if(ftp_init() == 0)
-    {
-      /* ftp loop */
-      status = loop(ftp_loop);
-
-      /* done with ftp */
-      ftp_exit();
-    }
-    else
-      status = LOOP_EXIT;
-  }
-
-#if defined(_3DS) || defined(__SWITCH__)
-  console_print("Press B to exit\n");
-#endif
-
-#ifdef ENABLE_LOGGING
-log_fail:
-  if(fclose(stderr) != 0)
-    console_print(RED "fclose(%d): 0x%08X\n" RESET, fileno(stderr), errno);
-#endif
-
-#ifdef _3DS
-  loop(wait_for_b);
-
-  /* deinitialize 3DS services */
-  gfxExit();
-  acExit();
-#elif defined(__SWITCH__)
-  loop(wait_for_b);
-
-  /* deinitialize Switch services */
-  consoleExit(NULL);
-  nifmExit();
-#endif
-  return 0;
-}

source/main.cpp

@@ -0,0 +1,52 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "platform.h"
+
+#include "ftpServer.h"
+
+#include "imgui.h"
+
+#include <cstdio>
+#include <cstdlib>
+
+int main (int argc_, char *argv_[])
+{
+	if (!platform::init ())
+		return EXIT_FAILURE;
+
+	auto &style          = ImGui::GetStyle ();
+	style.WindowRounding = 0.0f;
+
+#ifdef _3DS
+	style.Colors[ImGuiCol_WindowBg].w = 0.5f;
+#endif
+
+	auto server = FtpServer::create (5000);
+
+	while (platform::loop ())
+	{
+		server->draw ();
+
+		platform::render ();
+	}
+
+	platform::exit ();
+}

source/nx/imgui_deko3d.cpp

@@ -0,0 +1,681 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "imgui_deko3d.h"
+
+#include "imgui.h"
+
+#include "fs.h"
+#include "log.h"
+
+#include <deko3d.hpp>
+#include <switch.h>
+
+#include <zstd.h>
+
+#define GLM_FORCE_DEFAULT_ALIGNED_GENTYPES
+#define GLM_FORCE_INTRINSICS
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <glm/mat4x4.hpp>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <numeric>
+
+namespace
+{
+constexpr auto LOGO_WIDTH  = 500;
+constexpr auto LOGO_HEIGHT = 493;
+
+constexpr auto FB_NUM = 2u;
+
+constexpr auto CMDBUF_SIZE   = 1024 * 1024;
+constexpr auto DATABUF_SIZE  = 1024 * 1024;
+constexpr auto INDEXBUF_SIZE = 1024 * 1024;
+constexpr auto IMAGEBUF_SIZE = 16 * 1024 * 1024;
+
+struct VertUBO
+{
+	glm::mat4 projMtx;
+};
+
+struct FragUBO
+{
+	std::uint32_t font;
+};
+
+constexpr std::array VertexAttribState = {
+    // clang-format off
+    DkVtxAttribState{0, 0, offsetof (ImDrawVert, pos), DkVtxAttribSize_2x32, DkVtxAttribType_Float, 0},
+    DkVtxAttribState{0, 0, offsetof (ImDrawVert, uv),  DkVtxAttribSize_2x32, DkVtxAttribType_Float, 0},
+    DkVtxAttribState{0, 0, offsetof (ImDrawVert, col), DkVtxAttribSize_4x8,  DkVtxAttribType_Unorm, 0},
+    // clang-format on
+};
+
+constexpr std::array VertexBufferState = {
+    DkVtxBufferState{sizeof (ImDrawVert), 0},
+};
+
+dk::UniqueDevice s_device;
+
+dk::UniqueMemBlock s_depthMemBlock;
+dk::Image s_depthBuffer;
+
+dk::UniqueMemBlock s_fbMemBlock;
+dk::Image s_frameBuffers[FB_NUM];
+
+dk::Image s_fontTexture;
+dk::Image s_logoTexture;
+
+dk::UniqueSwapchain s_swapchain;
+
+dk::UniqueMemBlock s_codeMemBlock;
+dk::Shader s_shaders[2];
+
+dk::UniqueMemBlock s_uboMemBlock;
+
+dk::UniqueMemBlock s_vtxMemBlock[FB_NUM];
+dk::UniqueMemBlock s_idxMemBlock[FB_NUM];
+dk::UniqueMemBlock s_cmdMemBlock[FB_NUM];
+dk::UniqueCmdBuf s_cmdBuf[FB_NUM];
+
+dk::UniqueMemBlock s_imageMemBlock;
+dk::UniqueMemBlock s_descriptorMemBlock;
+
+dk::UniqueQueue s_queue;
+
+constexpr auto MAX_SAMPLERS                 = 1;
+constexpr auto MAX_IMAGES                   = 2;
+dk::SamplerDescriptor *s_samplerDescriptors = nullptr;
+dk::ImageDescriptor *s_imageDescriptors     = nullptr;
+
+std::uintptr_t s_boundDescriptor = 0;
+
+unsigned s_width  = 0;
+unsigned s_height = 0;
+
+template <typename T, typename U>
+constexpr inline std::uint32_t align (T const &size_, U const &align_)
+{
+	return static_cast<std::uint32_t> (size_ + align_ - 1) & ~(align_ - 1);
+}
+
+void rebuildSwapchain (unsigned const width_, unsigned const height_)
+{
+	s_swapchain = nullptr;
+
+	dk::ImageLayout depthLayout;
+	dk::ImageLayoutMaker{s_device}
+	    .setFlags (DkImageFlags_UsageRender | DkImageFlags_HwCompression)
+	    .setFormat (DkImageFormat_Z24S8)
+	    .setDimensions (width_, height_)
+	    .initialize (depthLayout);
+
+	auto const depthAlign = depthLayout.getAlignment ();
+	auto const depthSize  = depthLayout.getSize ();
+
+	if (!s_depthMemBlock)
+	{
+		s_depthMemBlock = dk::MemBlockMaker{s_device,
+		    align (depthSize, std::max<unsigned> (depthAlign, DK_MEMBLOCK_ALIGNMENT))}
+		                      .setFlags (DkMemBlockFlags_GpuCached | DkMemBlockFlags_Image)
+		                      .create ();
+	}
+
+	s_depthBuffer.initialize (depthLayout, s_depthMemBlock, 0);
+
+	dk::ImageLayout fbLayout;
+	dk::ImageLayoutMaker{s_device}
+	    .setFlags (
+	        DkImageFlags_UsageRender | DkImageFlags_UsagePresent | DkImageFlags_HwCompression)
+	    .setFormat (DkImageFormat_RGBA8_Unorm)
+	    .setDimensions (width_, height_)
+	    .initialize (fbLayout);
+
+	auto const fbAlign = fbLayout.getAlignment ();
+	auto const fbSize  = fbLayout.getSize ();
+
+	if (!s_fbMemBlock)
+	{
+		s_fbMemBlock = dk::MemBlockMaker{s_device,
+		    align (FB_NUM * fbSize, std::max<unsigned> (fbAlign, DK_MEMBLOCK_ALIGNMENT))}
+		                   .setFlags (DkMemBlockFlags_GpuCached | DkMemBlockFlags_Image)
+		                   .create ();
+	}
+
+	std::array<DkImage const *, FB_NUM> swapchainImages;
+	for (unsigned i = 0; i < FB_NUM; ++i)
+	{
+		swapchainImages[i] = &s_frameBuffers[i];
+		s_frameBuffers[i].initialize (fbLayout, s_fbMemBlock, i * fbSize);
+	}
+
+	s_swapchain = dk::SwapchainMaker{s_device, nwindowGetDefault (), swapchainImages}.create ();
+}
+
+void loadShaders ()
+{
+	struct ShaderFile
+	{
+		ShaderFile (dk::Shader &shader_, char const *const path_)
+		    : shader (shader_), path (path_), size (getSize (path_))
+		{
+		}
+
+		static std::size_t getSize (char const *const path_)
+		{
+			struct stat st;
+			auto const rc = stat (path_, &st);
+			if (rc != 0)
+			{
+				std::fprintf (stderr, "stat(%s): %s\n", path_, std::strerror (errno));
+				std::abort ();
+			}
+
+			return st.st_size;
+		}
+
+		dk::Shader &shader;
+		char const *const path;
+		std::size_t const size;
+	};
+
+	auto shaderFiles = {ShaderFile{s_shaders[0], "romfs:/shaders/imgui_vsh.dksh"},
+	    ShaderFile{s_shaders[1], "romfs:/shaders/imgui_fsh.dksh"}};
+
+	auto const codeSize = std::accumulate (std::begin (shaderFiles),
+	    std::end (shaderFiles),
+	    DK_SHADER_CODE_UNUSABLE_SIZE,
+	    [] (auto const sum_, auto const &file_) {
+		    return sum_ + align (file_.size, DK_SHADER_CODE_ALIGNMENT);
+	    });
+
+	s_codeMemBlock = dk::MemBlockMaker{s_device, align (codeSize, DK_MEMBLOCK_ALIGNMENT)}
+	                     .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached |
+	                                DkMemBlockFlags_Code)
+	                     .create ();
+
+	auto const addr    = static_cast<std::uint8_t *> (s_codeMemBlock.getCpuAddr ());
+	std::size_t offset = 0;
+
+	for (auto &file : shaderFiles)
+	{
+		std::uint32_t const codeOffset = offset;
+
+		fs::File fp;
+		if (!fp.open (file.path))
+		{
+			std::fprintf (stderr, "open(%s): %s\n", file.path, std::strerror (errno));
+			std::abort ();
+		}
+
+		if (!fp.readAll (&addr[offset], file.size))
+		{
+			std::fprintf (stderr, "read(%s): %s\n", file.path, std::strerror (errno));
+			std::abort ();
+		}
+
+		dk::ShaderMaker{s_codeMemBlock, codeOffset}.initialize (file.shader);
+
+		offset = align (offset + file.size, DK_SHADER_CODE_ALIGNMENT);
+	}
+}
+
+DkCmdList setupRenderState (int const slot_,
+    ImDrawData *const drawData_,
+    unsigned const width_,
+    unsigned const height_)
+{
+	// Setup viewport, orthographic projection matrix
+	// Our visible imgui space lies from drawData_->DisplayPos (top left) to
+	// drawData_->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single
+	// viewport apps.
+	auto const L = drawData_->DisplayPos.x;
+	auto const R = drawData_->DisplayPos.x + drawData_->DisplaySize.x;
+	auto const T = drawData_->DisplayPos.y;
+	auto const B = drawData_->DisplayPos.y + drawData_->DisplaySize.y;
+
+	VertUBO vertUBO;
+	vertUBO.projMtx = glm::orthoRH_ZO (L, R, B, T, -1.0f, 1.0f);
+
+	s_cmdBuf[slot_].setViewports (0, DkViewport{0.0f, 0.0f, width_, height_});
+	s_cmdBuf[slot_].bindShaders (DkStageFlag_GraphicsMask, {&s_shaders[0], &s_shaders[1]});
+	s_cmdBuf[slot_].bindUniformBuffer (DkStage_Vertex,
+	    0,
+	    s_uboMemBlock.getGpuAddr (),
+	    align (sizeof (VertUBO), DK_UNIFORM_BUF_ALIGNMENT));
+	s_cmdBuf[slot_].pushConstants (s_uboMemBlock.getGpuAddr (),
+	    align (sizeof (VertUBO), DK_UNIFORM_BUF_ALIGNMENT),
+	    0,
+	    sizeof (VertUBO),
+	    &vertUBO);
+	s_cmdBuf[slot_].bindUniformBuffer (DkStage_Fragment,
+	    0,
+	    s_uboMemBlock.getGpuAddr () + align (sizeof (VertUBO), DK_UNIFORM_BUF_ALIGNMENT),
+	    align (sizeof (FragUBO), DK_UNIFORM_BUF_ALIGNMENT));
+	s_cmdBuf[slot_].bindRasterizerState (dk::RasterizerState{}.setCullMode (DkFace_None));
+	s_cmdBuf[slot_].bindColorState (dk::ColorState{}.setBlendEnable (0, true));
+	s_cmdBuf[slot_].bindColorWriteState (dk::ColorWriteState{});
+	s_cmdBuf[slot_].bindDepthStencilState (dk::DepthStencilState{}.setDepthTestEnable (false));
+	s_cmdBuf[slot_].bindBlendStates (0,
+	    dk::BlendState{}.setFactors (DkBlendFactor_SrcAlpha,
+	        DkBlendFactor_InvSrcAlpha,
+	        DkBlendFactor_InvSrcAlpha,
+	        DkBlendFactor_Zero));
+	s_cmdBuf[slot_].bindVtxAttribState (VertexAttribState);
+	s_cmdBuf[slot_].bindVtxBufferState (VertexBufferState);
+
+	return s_cmdBuf[slot_].finishList ();
+}
+}
+
+void imgui::deko3d::init ()
+{
+	// Setup back-end capabilities flags
+	ImGuiIO &io = ImGui::GetIO ();
+
+	io.BackendRendererName = "deko3d";
+	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
+}
+
+void imgui::deko3d::exit ()
+{
+	s_queue.waitIdle ();
+
+	s_queue              = nullptr;
+	s_descriptorMemBlock = nullptr;
+	s_imageMemBlock      = nullptr;
+
+	for (unsigned i = 0; i < FB_NUM; ++i)
+	{
+		s_cmdBuf[i]      = nullptr;
+		s_cmdMemBlock[i] = nullptr;
+		s_idxMemBlock[i] = nullptr;
+		s_vtxMemBlock[i] = nullptr;
+	}
+
+	s_uboMemBlock   = nullptr;
+	s_codeMemBlock  = nullptr;
+	s_swapchain     = nullptr;
+	s_fbMemBlock    = nullptr;
+	s_depthMemBlock = nullptr;
+	s_device        = nullptr;
+}
+
+void imgui::deko3d::newFrame ()
+{
+	if (s_device)
+		return;
+
+	s_device = dk::DeviceMaker{}.create ();
+
+	rebuildSwapchain (1920, 1080);
+
+	loadShaders ();
+
+	s_uboMemBlock = dk::MemBlockMaker{s_device,
+	    align (align (sizeof (VertUBO), DK_UNIFORM_BUF_ALIGNMENT) +
+	               align (sizeof (FragUBO), DK_UNIFORM_BUF_ALIGNMENT),
+	        DK_MEMBLOCK_ALIGNMENT)}
+	                    .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+	                    .create ();
+
+	for (std::size_t i = 0; i < FB_NUM; ++i)
+	{
+		s_vtxMemBlock[i] = dk::MemBlockMaker{s_device, align (DATABUF_SIZE, DK_MEMBLOCK_ALIGNMENT)}
+		                       .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		                       .create ();
+
+		s_idxMemBlock[i] = dk::MemBlockMaker{s_device, align (INDEXBUF_SIZE, DK_MEMBLOCK_ALIGNMENT)}
+		                       .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		                       .create ();
+
+		s_cmdMemBlock[i] = dk::MemBlockMaker{s_device, align (CMDBUF_SIZE, DK_MEMBLOCK_ALIGNMENT)}
+		                       .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		                       .create ();
+
+		s_cmdBuf[i] = dk::CmdBufMaker{s_device}.create ();
+
+		s_cmdBuf[i].addMemory (s_cmdMemBlock[i], 0, s_cmdMemBlock[i].getSize ());
+	}
+
+	s_queue = dk::QueueMaker{s_device}.setFlags (DkQueueFlags_Graphics).create ();
+
+	s_imageMemBlock = dk::MemBlockMaker{s_device, align (IMAGEBUF_SIZE, DK_MEMBLOCK_ALIGNMENT)}
+	                      .setFlags (DkMemBlockFlags_GpuCached | DkMemBlockFlags_Image)
+	                      .create ();
+
+	// Build texture atlas
+	ImGuiIO &io = ImGui::GetIO ();
+	io.Fonts->SetTexID (nullptr);
+	unsigned char *pixels;
+	int width;
+	int height;
+	io.Fonts->GetTexDataAsAlpha8 (&pixels, &width, &height);
+
+	dk::UniqueMemBlock memBlock =
+	    dk::MemBlockMaker{s_device, align (width * height, DK_MEMBLOCK_ALIGNMENT)}
+	        .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+	        .create ();
+	std::memcpy (memBlock.getCpuAddr (), pixels, width * height);
+
+	static_assert (sizeof (dk::ImageDescriptor) == DK_IMAGE_DESCRIPTOR_ALIGNMENT);
+	static_assert (sizeof (dk::SamplerDescriptor) == DK_SAMPLER_DESCRIPTOR_ALIGNMENT);
+	static_assert (DK_IMAGE_DESCRIPTOR_ALIGNMENT == DK_SAMPLER_DESCRIPTOR_ALIGNMENT);
+	s_descriptorMemBlock = dk::MemBlockMaker{s_device,
+	    align ((MAX_SAMPLERS + MAX_IMAGES) * sizeof (dk::ImageDescriptor), DK_MEMBLOCK_ALIGNMENT)}
+	                           .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+	                           .create ();
+
+	s_samplerDescriptors =
+	    static_cast<dk::SamplerDescriptor *> (s_descriptorMemBlock.getCpuAddr ());
+	s_imageDescriptors =
+	    reinterpret_cast<dk::ImageDescriptor *> (&s_samplerDescriptors[MAX_SAMPLERS]);
+
+	s_samplerDescriptors[0].initialize (
+	    dk::Sampler{}
+	        .setFilter (DkFilter_Linear, DkFilter_Linear)
+	        .setWrapMode (DkWrapMode_ClampToEdge, DkWrapMode_ClampToEdge, DkWrapMode_ClampToEdge));
+
+	auto &cmdBuf = s_cmdBuf[0];
+	dk::ImageLayout layout;
+	dk::ImageLayoutMaker{s_device}
+	    .setFlags (0)
+	    .setFormat (DkImageFormat_R8_Unorm)
+	    .setDimensions (width, height)
+	    .initialize (layout);
+
+	s_fontTexture.initialize (layout, s_imageMemBlock, 0);
+	s_imageDescriptors[0].initialize (s_fontTexture);
+
+	dk::ImageView imageView{s_fontTexture};
+	cmdBuf.copyBufferToImage ({memBlock.getGpuAddr ()}, imageView, {0, 0, 0, width, height, 1});
+
+	cmdBuf.bindSamplerDescriptorSet (s_descriptorMemBlock.getGpuAddr (), MAX_SAMPLERS);
+	cmdBuf.bindImageDescriptorSet (
+	    s_descriptorMemBlock.getGpuAddr () + MAX_SAMPLERS * sizeof (dk::SamplerDescriptor),
+	    MAX_IMAGES);
+
+	s_queue.submitCommands (cmdBuf.finishList ());
+	s_queue.waitIdle ();
+
+	{
+		auto const path = "romfs:/deko3d.rgba.zst";
+
+		struct stat st;
+		if (stat (path, &st) != 0)
+		{
+			std::fprintf (stderr, "stat(%s): %s\n", path, std::strerror (errno));
+			std::abort ();
+		}
+
+		fs::File fp;
+		if (!fp.open (path))
+		{
+			std::fprintf (stderr, "open(%s): %s\n", path, std::strerror (errno));
+			std::abort ();
+		}
+
+		std::vector<char> buffer (st.st_size);
+		if (!fp.readAll (buffer.data (), st.st_size))
+		{
+			std::fprintf (stderr, "read(%s): %s\n", path, std::strerror (errno));
+			std::abort ();
+		}
+
+		fp.close ();
+
+		auto const size = ZSTD_getFrameContentSize (buffer.data (), st.st_size);
+		if (ZSTD_isError (size))
+		{
+			std::fprintf (stderr, "ZSTD_getFrameContentSize: %s\n", ZSTD_getErrorName (size));
+			std::abort ();
+		}
+
+		memBlock = dk::MemBlockMaker{s_device, align (size, DK_MEMBLOCK_ALIGNMENT)}
+		               .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		               .create ();
+
+		auto const decoded =
+		    ZSTD_decompress (memBlock.getCpuAddr (), size, buffer.data (), st.st_size);
+		if (ZSTD_isError (decoded))
+		{
+			std::fprintf (stderr, "ZSTD_decompress: %s\n", ZSTD_getErrorName (decoded));
+			std::abort ();
+		}
+
+		dk::ImageLayout layout;
+		dk::ImageLayoutMaker{s_device}
+		    .setFlags (0)
+		    .setFormat (DkImageFormat_RGBA8_Unorm)
+		    .setDimensions (LOGO_WIDTH, LOGO_HEIGHT)
+		    .initialize (layout);
+
+		auto const offset = align (width * height, DK_IMAGE_LINEAR_STRIDE_ALIGNMENT);
+		s_logoTexture.initialize (layout, s_imageMemBlock, offset);
+		s_imageDescriptors[1].initialize (s_logoTexture);
+
+		dk::ImageView imageView{s_logoTexture};
+		cmdBuf.copyBufferToImage (
+		    {memBlock.getGpuAddr ()}, imageView, {0, 0, 0, LOGO_WIDTH, LOGO_HEIGHT, 1});
+
+		s_queue.submitCommands (cmdBuf.finishList ());
+		s_queue.waitIdle ();
+	}
+
+	cmdBuf.clear ();
+}
+
+void imgui::deko3d::render ()
+{
+	auto const drawData = ImGui::GetDrawData ();
+	if (drawData->CmdListsCount <= 0)
+		return;
+
+	unsigned width  = drawData->DisplaySize.x * drawData->FramebufferScale.x;
+	unsigned height = drawData->DisplaySize.y * drawData->FramebufferScale.y;
+	if (width <= 0 || height <= 0)
+		return;
+
+	if (width != s_width || height != s_height)
+	{
+		s_width  = width;
+		s_height = height;
+
+		s_queue.waitIdle ();
+		rebuildSwapchain (width, height);
+	}
+
+	auto const slot = s_queue.acquireImage (s_swapchain);
+	s_cmdBuf[slot].clear ();
+
+	dk::ImageView colorTarget{s_frameBuffers[slot]};
+	dk::ImageView depthTarget{s_depthBuffer};
+	s_cmdBuf[slot].bindRenderTargets (&colorTarget, &depthTarget);
+	s_cmdBuf[slot].clearColor (0, DkColorMask_RGBA, 0.125f, 0.294f, 0.478f, 1.0f);
+	s_cmdBuf[slot].clearDepthStencil (true, 1.0f, 0xFF, 0);
+	s_queue.submitCommands (s_cmdBuf[slot].finishList ());
+
+	// Setup desired render state
+	auto const setupCmd = setupRenderState (slot, drawData, width, height);
+	s_queue.submitCommands (setupCmd);
+
+	s_boundDescriptor = ~static_cast<std::uintptr_t> (0);
+
+	// Will project scissor/clipping rectangles into framebuffer space
+	// (0,0) unless using multi-viewports
+	auto const clipOff = drawData->DisplayPos;
+	// (1,1) unless using retina display which are often (2,2)
+	auto const clipScale = drawData->FramebufferScale;
+
+	if (s_vtxMemBlock[slot].getSize () < drawData->TotalVtxCount * sizeof (ImDrawVert))
+	{
+		s_vtxMemBlock[slot] = nullptr;
+		s_vtxMemBlock[slot] =
+		    dk::MemBlockMaker{s_device,
+		        align (drawData->TotalVtxCount * sizeof (ImDrawVert), DK_MEMBLOCK_ALIGNMENT)}
+		        .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		        .create ();
+	}
+
+	if (s_idxMemBlock[slot].getSize () < drawData->TotalIdxCount * sizeof (ImDrawIdx))
+	{
+		s_idxMemBlock[slot] = nullptr;
+		s_idxMemBlock[slot] =
+		    dk::MemBlockMaker{s_device,
+		        align (drawData->TotalIdxCount * sizeof (ImDrawIdx), DK_MEMBLOCK_ALIGNMENT)}
+		        .setFlags (DkMemBlockFlags_CpuUncached | DkMemBlockFlags_GpuCached)
+		        .create ();
+	}
+
+	auto const cpuVtx = static_cast<std::uint8_t *> (s_vtxMemBlock[slot].getCpuAddr ());
+	auto const cpuIdx = static_cast<std::uint8_t *> (s_idxMemBlock[slot].getCpuAddr ());
+
+	auto const gpuVtx = s_vtxMemBlock[slot].getGpuAddr ();
+	auto const gpuIdx = s_idxMemBlock[slot].getGpuAddr ();
+
+	auto const sizeVtx = s_vtxMemBlock[slot].getSize ();
+	auto const sizeIdx = s_idxMemBlock[slot].getSize ();
+
+	static_assert (sizeof (ImDrawIdx) == 2);
+	s_cmdBuf[slot].bindVtxBuffer (0, gpuVtx, sizeVtx);
+	s_cmdBuf[slot].bindIdxBuffer (DkIdxFormat_Uint16, gpuIdx);
+
+	// Render command lists
+	std::size_t offsetVtx = 0;
+	std::size_t offsetIdx = 0;
+	for (int i = 0; i < drawData->CmdListsCount; ++i)
+	{
+		auto const &cmdList = *drawData->CmdLists[i];
+
+		auto const vtxSize = cmdList.VtxBuffer.Size * sizeof (ImDrawVert);
+		auto const idxSize = cmdList.IdxBuffer.Size * sizeof (ImDrawIdx);
+
+		if (sizeVtx - offsetVtx < vtxSize)
+		{
+			std::fprintf (stderr, "Not enough vertex buffer\n");
+			std::fprintf (stderr, "\t%zu/%u used, need %zu\n", offsetVtx, sizeVtx, vtxSize);
+			continue;
+		}
+
+		if (sizeIdx - offsetIdx < idxSize)
+		{
+			std::fprintf (stderr, "Not enough index buffer\n");
+			std::fprintf (stderr, "\t%zu/%u used, need %zu\n", offsetIdx, sizeIdx, idxSize);
+			continue;
+		}
+
+		std::memcpy (cpuVtx + offsetVtx, cmdList.VtxBuffer.Data, vtxSize);
+		std::memcpy (cpuIdx + offsetIdx, cmdList.IdxBuffer.Data, idxSize);
+
+		for (auto const &cmd : cmdList.CmdBuffer)
+		{
+			if (cmd.UserCallback)
+			{
+				s_queue.submitCommands (s_cmdBuf[slot].finishList ());
+
+				// User callback, registered via ImDrawList::AddCallback()
+				// (ImDrawCallback_ResetRenderState is a special callback value used by the user to
+				// request the renderer to reset render state.)
+				if (cmd.UserCallback == ImDrawCallback_ResetRenderState)
+					s_queue.submitCommands (setupCmd);
+				else
+					cmd.UserCallback (&cmdList, &cmd);
+			}
+			else
+			{
+				// Project scissor/clipping rectangles into framebuffer space
+				ImVec4 clip;
+				clip.x = (cmd.ClipRect.x - clipOff.x) * clipScale.x;
+				clip.y = (cmd.ClipRect.y - clipOff.y) * clipScale.y;
+				clip.z = (cmd.ClipRect.z - clipOff.x) * clipScale.x;
+				clip.w = (cmd.ClipRect.w - clipOff.y) * clipScale.y;
+
+				if (clip.x < width && clip.y < height && clip.z >= 0.0f && clip.w >= 0.0f)
+				{
+					if (clip.x < 0.0f)
+						clip.x = 0.0f;
+					if (clip.y < 0.0f)
+						clip.y = 0.0f;
+
+					s_cmdBuf[slot].setScissors (
+					    0, DkScissor{clip.x, clip.y, clip.z - clip.x, clip.w - clip.y});
+
+					auto const descriptor = reinterpret_cast<std::uintptr_t> (cmd.TextureId);
+					if (descriptor >= MAX_IMAGES)
+						continue;
+
+					if (descriptor != s_boundDescriptor)
+					{
+						s_boundDescriptor = descriptor;
+
+						s_cmdBuf[slot].bindTextures (
+						    DkStage_Fragment, 0, dkMakeTextureHandle (descriptor, 0));
+
+						FragUBO fragUBO;
+						fragUBO.font = (descriptor == 0);
+
+						s_cmdBuf[slot].pushConstants (
+						    s_uboMemBlock.getGpuAddr () +
+						        align (sizeof (VertUBO), DK_UNIFORM_BUF_ALIGNMENT),
+						    align (sizeof (FragUBO), DK_UNIFORM_BUF_ALIGNMENT),
+						    0,
+						    sizeof (FragUBO),
+						    &fragUBO);
+					}
+
+					s_cmdBuf[slot].drawIndexed (DkPrimitive_Triangles,
+					    cmd.ElemCount,
+					    1,
+					    cmd.IdxOffset + offsetIdx / sizeof (ImDrawIdx),
+					    cmd.VtxOffset + offsetVtx / sizeof (ImDrawVert),
+					    0);
+				}
+			}
+		}
+
+		offsetVtx += vtxSize;
+		offsetIdx += idxSize;
+	}
+
+	s_cmdBuf[slot].barrier (DkBarrier_Fragments, 0);
+	s_cmdBuf[slot].discardDepthStencil ();
+	s_queue.submitCommands (s_cmdBuf[slot].finishList ());
+
+	s_queue.presentImage (s_swapchain, slot);
+}
+
+void imgui::deko3d::test ()
+{
+	auto const x1 = (s_width - LOGO_WIDTH) / 2.0f;
+	auto const x2 = x1 + LOGO_WIDTH;
+	auto const y1 = (s_height - LOGO_HEIGHT) / 2.0f;
+	auto const y2 = y1 + LOGO_HEIGHT;
+
+	ImGui::GetBackgroundDrawList ()->AddImage (
+	    reinterpret_cast<ImTextureID> (1), ImVec2 (x1, y1), ImVec2 (x2, y2));
+}

source/nx/imgui_deko3d.h

@@ -0,0 +1,35 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+namespace imgui
+{
+namespace deko3d
+{
+void init ();
+void exit ();
+
+void newFrame ();
+void render ();
+
+void test ();
+}
+}

source/nx/imgui_fsh.glsl

@@ -0,0 +1,40 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+// 
+// Copyright (C) 2020 Michael Theall
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#version 460
+
+layout (location = 0) in vec2 vtxUv;
+layout (location = 1) in vec4 vtxColor;
+
+layout (binding = 0) uniform sampler2D tex;
+
+layout (std140, binding = 0) uniform FragUBO {
+	uint font;
+} ubo;
+
+layout (location = 0) out vec4 outColor;
+
+void main()
+{
+	if (ubo.font != 0)
+	    outColor = vtxColor * vec4 (vec3 (1.0), texture (tex, vtxUv).r);
+	else
+		outColor = vtxColor * texture (tex, vtxUv);
+}

source/nx/imgui_nx.h

@@ -0,0 +1,32 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+namespace imgui
+{
+namespace nx
+{
+bool init ();
+void exit ();
+
+void newFrame ();
+}
+}

source/nx/imgui_vsh.glsl

@@ -0,0 +1,40 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+// 
+// Copyright (C) 2020 Michael Theall
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#version 460
+
+layout (location = 0) in vec2 inPos;
+layout (location = 1) in vec2 inUv;
+layout (location = 2) in vec4 inColor;
+
+layout (location = 0) out vec2 vtxUv;
+layout (location = 1) out vec4 vtxColor;
+
+layout (std140, binding = 0) uniform VertUBO
+{
+	mat4 projMtx;
+} ubo;
+
+void main()
+{
+	gl_Position = ubo.projMtx * vec4 (inPos, 0.0, 1.0);
+	vtxUv       = inUv;
+	vtxColor    = inColor;
+}

source/nx/init.c

@@ -0,0 +1,77 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <switch.h>
+
+#include <unistd.h>
+
+#ifndef NDEBUG
+static int s_fd = -1;
+#endif
+
+static SocketInitConfig const s_socketInitConfig = {
+    .bsdsockets_version = 1,
+
+    .tcp_tx_buf_size     = 1 * 1024 * 1024,
+    .tcp_rx_buf_size     = 1 * 1024 * 1024,
+    .tcp_tx_buf_max_size = 4 * 1024 * 1024,
+    .tcp_rx_buf_max_size = 4 * 1024 * 1024,
+
+    .udp_tx_buf_size = 0x2400,
+    .udp_rx_buf_size = 0xA500,
+
+    .sb_efficiency = 8,
+
+    .num_bsd_sessions = 3,
+    .bsd_service_type = BsdServiceType_User,
+};
+
+u32 __nx_fs_num_sessions = 3;
+
+void userAppInit ()
+{
+	appletLockExit ();
+
+	romfsInit ();
+	plInitialize ();
+
+	if (R_FAILED (socketInitialize (&s_socketInitConfig)))
+		return;
+
+#ifndef NDEBUG
+	s_fd = nxlinkStdio ();
+#endif
+}
+
+void userAppExit ()
+{
+#ifndef NDEBUG
+	if (s_fd >= 0)
+	{
+		close (s_fd);
+		socketExit ();
+		s_fd = -1;
+	}
+#endif
+
+	plExit ();
+	romfsExit ();
+	appletUnlockExit ();
+}

source/nx/platform.cpp

@@ -0,0 +1,167 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "platform.h"
+
+#include "imgui_deko3d.h"
+#include "imgui_nx.h"
+
+#include "imgui.h"
+
+#include <switch.h>
+
+#include <mutex>
+#include <thread>
+
+bool platform::init ()
+{
+	IMGUI_CHECKVERSION ();
+	ImGui::CreateContext ();
+
+	if (!imgui::nx::init ())
+	{
+		ImGui::DestroyContext ();
+		return false;
+	}
+
+	imgui::deko3d::init ();
+
+	return true;
+}
+
+bool platform::loop ()
+{
+	if (!appletMainLoop ())
+		return false;
+
+	hidScanInput ();
+
+	auto const keysDown = hidKeysDown (CONTROLLER_P1_AUTO);
+	if (keysDown & KEY_PLUS)
+		return false;
+
+	imgui::nx::newFrame ();
+	imgui::deko3d::newFrame ();
+	ImGui::NewFrame ();
+
+	imgui::deko3d::test ();
+
+	return true;
+}
+
+void platform::render ()
+{
+	ImGui::Render ();
+
+	imgui::deko3d::render ();
+}
+
+void platform::exit ()
+{
+	imgui::nx::exit ();
+	imgui::deko3d::exit ();
+
+	ImGui::DestroyContext ();
+}
+
+///////////////////////////////////////////////////////////////////////////
+class platform::Thread::privateData_t
+{
+public:
+	privateData_t () = default;
+
+	privateData_t (std::function<void ()> func_) : thread (func_)
+	{
+	}
+
+	std::thread thread;
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Thread::~Thread () = default;
+
+platform::Thread::Thread () : m_d (new privateData_t ())
+{
+}
+
+platform::Thread::Thread (std::function<void ()> func_) : m_d (new privateData_t (func_))
+{
+}
+
+platform::Thread::Thread (Thread &&that_) : m_d (new privateData_t ())
+{
+	std::swap (m_d, that_.m_d);
+}
+
+platform::Thread &platform::Thread::operator= (Thread &&that_)
+{
+	std::swap (m_d, that_.m_d);
+	return *this;
+}
+
+void platform::Thread::join ()
+{
+	m_d->thread.join ();
+}
+
+void platform::Thread::sleep (std::chrono::milliseconds const timeout_)
+{
+	std::this_thread::sleep_for (timeout_);
+}
+
+///////////////////////////////////////////////////////////////////////////
+#define USE_STD_MUTEX 1
+class platform::Mutex::privateData_t
+{
+public:
+#if USE_STD_MUTEX
+	std::mutex mutex;
+#else
+	::Mutex mutex;
+#endif
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Mutex::~Mutex () = default;
+
+platform::Mutex::Mutex () : m_d (new privateData_t ())
+{
+#if !USE_STD_MUTEX
+	mutexInit (&m_d->mutex);
+#endif
+}
+
+void platform::Mutex::lock ()
+{
+#if USE_STD_MUTEX
+	m_d->mutex.lock ();
+#else
+	mutexLock (&m_d->mutex);
+#endif
+}
+
+void platform::Mutex::unlock ()
+{
+#if USE_STD_MUTEX
+	m_d->mutex.unlock ();
+#else
+	mutexUnlock (&m_d->mutex);
+#endif
+}

source/pc/KHR/khrplatform.h

@@ -0,0 +1 @@
+#error "Please use https://glad.dav1d.de/#profile=core&language=c&specification=gl&loader=on&api=gl%3D4.3"

source/pc/glad.c

@@ -0,0 +1 @@
+#error "Please use https://glad.dav1d.de/#profile=core&language=c&specification=gl&loader=on&api=gl%3D4.3"

source/pc/glad/glad.h

@@ -0,0 +1 @@
+#error "Please use https://glad.dav1d.de/#profile=core&language=c&specification=gl&loader=on&api=gl%3D4.3"

source/pc/imgui_impl_glfw.cpp

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui"

source/pc/imgui_impl_glfw.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui"

source/pc/imgui_impl_opengl3.cpp

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui"

source/pc/imgui_impl_opengl3.h

@@ -0,0 +1 @@
+#error "Please use https://github.com/ocornut/imgui"

source/pc/platform.cpp

@@ -0,0 +1,259 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "platform.h"
+
+#include "imgui.h"
+
+#include <glad/glad.h>
+
+#include <GLFW/glfw3.h>
+
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+
+#include <cstdio>
+#include <memory>
+#include <mutex>
+#include <thread>
+
+namespace
+{
+std::unique_ptr<GLFWwindow, void (*) (GLFWwindow *)> s_mainWindow (nullptr, glfwDestroyWindow);
+
+void windowResize (GLFWwindow *const window_, int const width_, int const height_)
+{
+	(void)window_;
+
+	if (!width_ || !height_)
+		return;
+
+	glViewport (0, 0, width_, height_);
+}
+
+#ifndef NDEBUG
+void logCallback (GLenum const source_,
+    GLenum const type_,
+    GLuint const id_,
+    GLenum const severity_,
+    GLsizei const length_,
+    GLchar const *const message_,
+    void const *const userParam_)
+{
+	(void)source_;
+	(void)type_;
+	(void)id_;
+	(void)severity_;
+	(void)length_;
+	(void)userParam_;
+	// std::fprintf (stderr, "%s\n", message_);
+}
+#endif
+}
+
+bool platform::init ()
+{
+	if (!glfwInit ())
+	{
+		std::fprintf (stderr, "Failed to initialize GLFW\n");
+		return false;
+	}
+
+	glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 4);
+	glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifndef NDEBUG
+	glfwWindowHint (GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
+#endif
+
+	// set depth buffer size
+	glfwWindowHint (GLFW_DEPTH_BITS, 24);
+	glfwWindowHint (GLFW_STENCIL_BITS, 8);
+
+	s_mainWindow.reset (glfwCreateWindow (1280, 720, "Test Game", nullptr, nullptr));
+	if (!s_mainWindow)
+	{
+		std::fprintf (stderr, "Failed to create window\n");
+		glfwTerminate ();
+		return false;
+	}
+
+	glfwSwapInterval (1);
+
+	// create context
+	glfwMakeContextCurrent (s_mainWindow.get ());
+	glfwSetFramebufferSizeCallback (s_mainWindow.get (), windowResize);
+
+	if (!gladLoadGL ())
+	{
+		std::fprintf (stderr, "gladLoadGL: failed\n");
+		platform::exit ();
+		return false;
+	}
+
+#ifndef NDEBUG
+	GLint flags;
+	glGetIntegerv (GL_CONTEXT_FLAGS, &flags);
+	if (flags & GL_CONTEXT_FLAG_DEBUG_BIT)
+	{
+		glEnable (GL_DEBUG_OUTPUT);
+		glEnable (GL_DEBUG_OUTPUT_SYNCHRONOUS);
+		glDebugMessageCallback (logCallback, nullptr);
+		glDebugMessageControl (GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, GL_TRUE);
+	}
+#endif
+
+	glEnable (GL_CULL_FACE);
+	glFrontFace (GL_CCW);
+	glCullFace (GL_BACK);
+
+	glEnable (GL_DEPTH_TEST);
+	glDepthFunc (GL_LEQUAL);
+
+	glClearColor (104.0f / 255.0f, 176.0f / 255.0f, 216.0f / 255.0f, 1.0f);
+	glEnable (GL_BLEND);
+	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	std::printf ("Renderer:       %s\n", glGetString (GL_RENDERER));
+	std::printf ("OpenGL Version: %s\n", glGetString (GL_VERSION));
+
+	IMGUI_CHECKVERSION ();
+	ImGui::CreateContext ();
+
+	ImGui_ImplGlfw_InitForOpenGL (s_mainWindow.get (), true);
+	ImGui_ImplOpenGL3_Init ("#version 150");
+
+	ImGuiIO &io    = ImGui::GetIO ();
+	io.IniFilename = nullptr;
+
+	return true;
+}
+
+bool platform::loop ()
+{
+	bool inactive;
+	do
+	{
+		inactive = glfwGetWindowAttrib (s_mainWindow.get (), GLFW_ICONIFIED);
+		(inactive ? glfwWaitEvents : glfwPollEvents) ();
+
+		if (glfwWindowShouldClose (s_mainWindow.get ()))
+			return false;
+	} while (inactive);
+
+	ImGui_ImplOpenGL3_NewFrame ();
+	ImGui_ImplGlfw_NewFrame ();
+	ImGui::NewFrame ();
+
+	return true;
+}
+
+void platform::render ()
+{
+	ImGui::Render ();
+
+	int width;
+	int height;
+	glfwGetFramebufferSize (s_mainWindow.get (), &width, &height);
+	glViewport (0, 0, width, height);
+	glClearColor (0.45f, 0.55f, 0.60f, 1.00f);
+	glClear (GL_COLOR_BUFFER_BIT);
+
+	ImGui_ImplOpenGL3_RenderDrawData (ImGui::GetDrawData ());
+
+	glfwSwapBuffers (s_mainWindow.get ());
+}
+
+void platform::exit ()
+{
+	ImGui::DestroyContext ();
+
+	s_mainWindow.reset ();
+	glfwTerminate ();
+}
+
+///////////////////////////////////////////////////////////////////////////
+class platform::Thread::privateData_t
+{
+public:
+	privateData_t () = default;
+
+	privateData_t (std::function<void ()> func_) : thread (func_)
+	{
+	}
+
+	std::thread thread;
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Thread::~Thread () = default;
+
+platform::Thread::Thread () : m_d (new privateData_t ())
+{
+}
+
+platform::Thread::Thread (std::function<void ()> func_) : m_d (new privateData_t (func_))
+{
+}
+
+platform::Thread::Thread (Thread &&that_) : m_d (new privateData_t ())
+{
+	std::swap (m_d, that_.m_d);
+}
+
+platform::Thread &platform::Thread::operator= (Thread &&that_)
+{
+	std::swap (m_d, that_.m_d);
+	return *this;
+}
+
+void platform::Thread::join ()
+{
+	m_d->thread.join ();
+}
+
+void platform::Thread::sleep (std::chrono::milliseconds const timeout_)
+{
+	std::this_thread::sleep_for (timeout_);
+}
+
+///////////////////////////////////////////////////////////////////////////
+class platform::Mutex::privateData_t
+{
+public:
+	std::mutex mutex;
+};
+
+///////////////////////////////////////////////////////////////////////////
+platform::Mutex::~Mutex () = default;
+
+platform::Mutex::Mutex () : m_d (new privateData_t ())
+{
+}
+
+void platform::Mutex::lock ()
+{
+	m_d->mutex.lock ();
+}
+
+void platform::Mutex::unlock ()
+{
+	m_d->mutex.unlock ();
+}

source/sockAddr.cpp

@@ -0,0 +1,150 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "sockAddr.h"
+
+#include <arpa/inet.h>
+
+#include <cassert>
+#include <cstring>
+
+///////////////////////////////////////////////////////////////////////////
+SockAddr::~SockAddr () = default;
+
+SockAddr::SockAddr () = default;
+
+SockAddr::SockAddr (SockAddr const &that_) = default;
+
+SockAddr::SockAddr (SockAddr &&that_) = default;
+
+SockAddr &SockAddr::operator= (SockAddr const &that_) = default;
+
+SockAddr &SockAddr::operator= (SockAddr &&that_) = default;
+
+SockAddr::SockAddr (struct sockaddr const &addr_)
+{
+	switch (addr_.sa_family)
+	{
+	case AF_INET:
+		std::memcpy (&m_addr, &addr_, sizeof (struct sockaddr_in));
+		break;
+
+#ifndef _3DS
+	case AF_INET6:
+		std::memcpy (&m_addr, &addr_, sizeof (struct sockaddr_in6));
+		break;
+#endif
+	}
+}
+
+SockAddr::SockAddr (struct sockaddr_in const &addr_)
+    : SockAddr (reinterpret_cast<struct sockaddr const &> (addr_))
+{
+}
+
+#ifndef _3DS
+SockAddr::SockAddr (struct sockaddr_in6 const &addr_)
+    : SockAddr (reinterpret_cast<struct sockaddr const &> (addr_))
+{
+}
+#endif
+
+SockAddr::SockAddr (struct sockaddr_storage const &addr_)
+    : SockAddr (reinterpret_cast<struct sockaddr const &> (addr_))
+{
+}
+
+SockAddr::operator struct sockaddr_in const & () const
+{
+	assert (m_addr.ss_family == AF_INET);
+	return reinterpret_cast<struct sockaddr_in const &> (m_addr);
+}
+
+#ifndef _3DS
+SockAddr::operator struct sockaddr_in6 const & () const
+{
+	assert (m_addr.ss_family == AF_INET6);
+	return reinterpret_cast<struct sockaddr_in6 const &> (m_addr);
+}
+#endif
+
+SockAddr::operator struct sockaddr_storage const & () const
+{
+	return m_addr;
+}
+
+SockAddr::operator struct sockaddr * ()
+{
+	return reinterpret_cast<struct sockaddr *> (&m_addr);
+}
+
+SockAddr::operator struct sockaddr const * () const
+{
+	return reinterpret_cast<struct sockaddr const *> (&m_addr);
+}
+
+std::uint16_t SockAddr::port () const
+{
+	switch (m_addr.ss_family)
+	{
+	case AF_INET:
+		return ntohs (reinterpret_cast<struct sockaddr_in const *> (&m_addr)->sin_port);
+
+#ifndef _3DS
+	case AF_INET6:
+		return ntohs (reinterpret_cast<struct sockaddr_in6 const *> (&m_addr)->sin6_port);
+#endif
+	}
+
+	return 0;
+}
+
+char const *SockAddr::name (char *buffer_, std::size_t size_) const
+{
+	switch (m_addr.ss_family)
+	{
+	case AF_INET:
+		return inet_ntop (AF_INET,
+		    &reinterpret_cast<struct sockaddr_in const *> (&m_addr)->sin_addr,
+		    buffer_,
+		    size_);
+
+#ifndef _3DS
+	case AF_INET6:
+		return inet_ntop (AF_INET6,
+		    &reinterpret_cast<struct sockaddr_in6 const *> (&m_addr)->sin6_addr,
+		    buffer_,
+		    size_);
+#endif
+	}
+
+	return nullptr;
+}
+
+char const *SockAddr::name () const
+{
+#if defined(_3DS)
+	thread_local static char buffer[INET_ADDRSTRLEN];
+#else
+	thread_local static char buffer[INET6_ADDRSTRLEN];
+#endif
+
+	return name (buffer, sizeof (buffer));
+}

source/socket.cpp

@@ -0,0 +1,334 @@
+// ftpd is a server implementation based on the following:
+// - RFC  959 (https://tools.ietf.org/html/rfc959)
+// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
+// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
+//
+// Copyright (C) 2020 Michael Theall
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "socket.h"
+
+#include "log.h"
+
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <poll.h>
+
+#include <cassert>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+
+///////////////////////////////////////////////////////////////////////////
+Socket::~Socket ()
+{
+	if (m_listening)
+		Log::info ("Stop listening on [%s]:%u\n", m_sockName.name (), m_sockName.port ());
+	if (m_connected)
+		Log::info ("Closing connection to [%s]:%u\n", m_peerName.name (), m_peerName.port ());
+	if (::close (m_fd) != 0)
+		Log::error ("close: %s\n", std::strerror (errno));
+}
+
+Socket::Socket (int const fd_) : m_fd (fd_), m_listening (false), m_connected (false)
+{
+}
+
+Socket::Socket (int const fd_, SockAddr const &sockName_, SockAddr const &peerName_)
+    : m_sockName (sockName_),
+      m_peerName (peerName_),
+      m_fd (fd_),
+      m_listening (false),
+      m_connected (true)
+{
+}
+
+UniqueSocket Socket::accept ()
+{
+	SockAddr addr;
+	socklen_t addrLen = sizeof (struct sockaddr_storage);
+
+	auto const fd = ::accept (m_fd, addr, &addrLen);
+	if (fd < 0)
+	{
+		Log::error ("accept: %s\n", std::strerror (errno));
+		return {nullptr, {}};
+	}
+
+	Log::info ("Accepted connection from [%s]:%u\n", addr.name (), addr.port ());
+	return UniqueSocket (new Socket (fd, m_sockName, addr));
+}
+
+int Socket::atMark ()
+{
+	auto const rc = ::sockatmark (m_fd);
+	if (rc < 0)
+		Log::error ("sockatmark: %s\n", std::strerror (errno));
+
+	return rc;
+}
+
+bool Socket::bind (SockAddr const &addr_)
+{
+	switch (static_cast<struct sockaddr_storage const &> (addr_).ss_family)
+	{
+	case AF_INET:
+		if (::bind (m_fd, addr_, sizeof (struct sockaddr_in)) != 0)
+		{
+			Log::error ("bind: %s\n", std::strerror (errno));
+			return false;
+		}
+		break;
+
+#ifndef _3DS
+	case AF_INET6:
+		if (::bind (m_fd, addr_, sizeof (struct sockaddr_in6)) != 0)
+		{
+			Log::error ("bind: %s\n", std::strerror (errno));
+			return false;
+		}
+		break;
+#endif
+
+	default:
+		errno = EINVAL;
+		Log::error ("bind: %s\n", std::strerror (errno));
+		break;
+	}
+
+	if (addr_.port () == 0)
+	{
+		socklen_t addrLen = sizeof (struct sockaddr_storage);
+		if (::getsockname (m_fd, m_sockName, &addrLen) != 0)
+			Log::error ("getsockname: %s\n", std::strerror (errno));
+	}
+	else
+		m_sockName = addr_;
+
+	return true;
+}
+
+bool Socket::connect (SockAddr const &addr_)
+{
+	if (::connect (m_fd, addr_, sizeof (struct sockaddr_storage)) != 0)
+	{
+		if (errno != EINPROGRESS)
+			Log::error ("connect: %s\n", std::strerror (errno));
+		else
+		{
+			m_peerName  = addr_;
+			m_connected = true;
+			Log::info ("Connecting to [%s]:%u\n", addr_.name (), addr_.port ());
+		}
+		return false;
+	}
+
+	m_peerName  = addr_;
+	m_connected = true;
+	Log::info ("Connected to [%s]:%u\n", addr_.name (), addr_.port ());
+	return true;
+}
+
+bool Socket::listen (int const backlog_)
+{
+	if (::listen (m_fd, backlog_) != 0)
+	{
+		Log::error ("listen: %s\n", std::strerror (errno));
+		return false;
+	}
+
+	m_listening = true;
+	return true;
+}
+
+bool Socket::shutdown (int const how_)
+{
+	if (::shutdown (m_fd, how_) != 0)
+	{
+		Log::info ("shutdown: %s\n", std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool Socket::setLinger (bool const enable_, std::chrono::seconds const time_)
+{
+	struct linger linger;
+	linger.l_onoff  = enable_;
+	linger.l_linger = time_.count ();
+
+	if (::setsockopt (m_fd, SOL_SOCKET, SO_LINGER, &linger, sizeof (linger)) != 0)
+	{
+		Log::error ("setsockopt(SO_LINGER, %s, %lus): %s\n",
+		    enable_ ? "on" : "off",
+		    static_cast<unsigned long> (time_.count ()),
+		    std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool Socket::setNonBlocking (bool const nonBlocking_)
+{
+	auto flags = ::fcntl (m_fd, F_GETFL, 0);
+	if (flags == -1)
+	{
+		Log::error ("fcntl(F_GETFL): %s\n", std::strerror (errno));
+		return false;
+	}
+
+	if (nonBlocking_)
+		flags |= O_NONBLOCK;
+	else
+		flags &= ~O_NONBLOCK;
+
+	if (::fcntl (m_fd, F_SETFL, flags) != 0)
+	{
+		Log::error ("fcntl(F_SETFL): %s\n", std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool Socket::setReuseAddress (bool const reuse_)
+{
+	int reuse = reuse_;
+	if (::setsockopt (m_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof (reuse)) != 0)
+	{
+		Log::error ("setsockopt(SO_REUSEADDR, %u): %s\n", reuse_, std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool Socket::setRecvBufferSize (std::size_t const size_)
+{
+	int size = size_;
+	if (::setsockopt (m_fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) != 0)
+	{
+		Log::error ("setsockopt(SO_RCVBUF, %zu): %s\n", size_, std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool Socket::setSendBufferSize (std::size_t const size_)
+{
+	int size = size_;
+	if (::setsockopt (m_fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) != 0)
+	{
+		Log::error ("setsockopt(SO_SNDBUF, %zu): %s\n", size_, std::strerror (errno));
+		return false;
+	}
+
+	return true;
+}
+
+ssize_t Socket::read (void *const buffer_, std::size_t const size_, bool const oob_)
+{
+	assert (buffer_);
+	assert (size_);
+	auto const rc = ::recv (m_fd, buffer_, size_, oob_ ? MSG_OOB : 0);
+	if (rc < 0 && errno != EWOULDBLOCK)
+		Log::error ("recv: %s\n", std::strerror (errno));
+
+	return rc;
+}
+
+ssize_t Socket::read (IOBuffer &buffer_, bool const oob_)
+{
+	auto const rc = read (buffer_.freeArea (), buffer_.freeSize (), oob_);
+	if (rc > 0)
+		buffer_.markUsed (rc);
+
+	return rc;
+}
+
+ssize_t Socket::write (void const *const buffer_, std::size_t const size_)
+{
+	assert (buffer_);
+	assert (size_);
+	auto const rc = ::send (m_fd, buffer_, size_, 0);
+	if (rc < 0 && errno != EWOULDBLOCK)
+		Log::error ("send: %s\n", std::strerror (errno));
+
+	return rc;
+}
+
+ssize_t Socket::write (IOBuffer &buffer_)
+{
+	auto const rc = write (buffer_.usedArea (), buffer_.usedSize ());
+	if (rc > 0)
+		buffer_.markFree (rc);
+
+	return rc;
+}
+
+SockAddr const &Socket::sockName () const
+{
+	return m_sockName;
+}
+
+SockAddr const &Socket::peerName () const
+{
+	return m_peerName;
+}
+
+UniqueSocket Socket::create ()
+{
+	auto const fd = ::socket (AF_INET, SOCK_STREAM, 0);
+	if (fd < 0)
+	{
+		Log::error ("socket: %s\n", std::strerror (errno));
+		return nullptr;
+	}
+
+	return UniqueSocket (new Socket (fd));
+}
+
+int Socket::poll (PollInfo *const info_,
+    std::size_t const count_,
+    std::chrono::milliseconds const timeout_)
+{
+	if (count_ == 0)
+		return 0;
+
+	auto const pfd = std::make_unique<struct pollfd[]> (count_);
+	for (std::size_t i = 0; i < count_; ++i)
+	{
+		pfd[i].fd      = info_[i].socket.get ().m_fd;
+		pfd[i].events  = info_[i].events;
+		pfd[i].revents = 0;
+	}
+
+	auto const rc = ::poll (pfd.get (), count_, timeout_.count ());
+	if (rc < 0)
+	{
+		Log::error ("poll: %s\n", std::strerror (errno));
+		return rc;
+	}
+
+	for (std::size_t i = 0; i < count_; ++i)
+		info_[i].revents = pfd[i].revents;
+
+	return rc;
+}