Start adding stub VFS implementation

Makefile.common

@@ -183,6 +183,7 @@ OBJ += frontend/frontend.o \
        $(LIBRETRO_COMM_DIR)/streams/file_stream_transforms.o \
        $(LIBRETRO_COMM_DIR)/streams/interface_stream.o \
        $(LIBRETRO_COMM_DIR)/streams/memory_stream.o \
+       $(LIBRETRO_COMM_DIR)/vfs/vfs_implementation.o \
        $(LIBRETRO_COMM_DIR)/lists/string_list.o \
        $(LIBRETRO_COMM_DIR)/string/stdstring.o \
        $(LIBRETRO_COMM_DIR)/memmap/memalign.o \

griffin/griffin.c

@@ -820,6 +820,7 @@ FILE
 #include "../libretro-common/streams/file_stream_transforms.c"
 #include "../libretro-common/streams/interface_stream.c"
 #include "../libretro-common/streams/memory_stream.c"
+#include "../libretro-common/vfs/vfs_implementation.c"
 #include "../list_special.c"
 #include "../libretro-common/string/stdstring.c"
 #include "../libretro-common/file/nbio/nbio_stdio.c"

libretro-common/include/vfs/vfs_implementation.h

@@ -0,0 +1,63 @@
+/* Copyright  (C) 2010-2017 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (vfs_implementation.h).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef __LIBRETRO_SDK_VFS_IMPLEMENTATION_H
+#define __LIBRETRO_SDK_VFS_IMPLEMENTATION_H
+
+#include <stdint.h>
+#include <libretro.h>
+
+/* Replace the following symbol with something appropriate
+ * to signify the file is being compiled for a front end instead of a core.
+ * This allows the same code to act as reference implementation
+ * for VFS and as fallbacks for when the front end does not provide VFS functionality.
+ */
+
+#ifdef VFS_FRONTEND
+typedef struct retro_vfs_file_handle libretro_vfs_implementation_file;
+#else
+typedef struct libretro_vfs_implementation_file libretro_vfs_implementation_file;
+#endif
+
+libretro_vfs_implementation_file *retro_vfs_file_open_impl(const char *path, uint64_t flags);
+
+int retro_vfs_file_close_impl(libretro_vfs_implementation_file *stream);
+
+int retro_vfs_file_error_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_seek_impl(libretro_vfs_implementation_file *stream, int64_t offset);
+
+int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream, void *s, uint64_t len);
+
+int64_t retro_vfs_file_write_impl(libretro_vfs_implementation_file *stream, const void *s, uint64_t len);
+
+int retro_vfs_file_flush_impl(libretro_vfs_implementation_file *stream);
+
+int retro_vfs_file_delete_impl(const char *path);
+
+const char *retro_vfs_file_get_path_impl(libretro_vfs_implementation_file *stream);
+
+#endif

libretro-common/vfs/vfs_implementation.c

@@ -0,0 +1,117 @@
+/* Copyright  (C) 2010-2017 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (vfs_implementation.c).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <vfs/vfs_implementation.h>
+#include <string/stdstring.h>
+#include <memmap.h>
+#include <retro_miscellaneous.h>
+#include <encodings/utf.h>
+
+enum libretro_file_hints
+{
+	RFILE_HINT_MMAP       = 1 << 8,
+	RFILE_HINT_UNBUFFERED = 1 << 9
+};
+
+#ifdef VFS_FRONTEND
+struct retro_vfs_file_handle
+#else
+struct libretro_vfs_implementation_file
+#endif
+{
+   void *empty;
+};
+
+int64_t retro_vfs_file_seek_internal(libretro_vfs_implementation_file *stream, int64_t offset, int whence)
+{
+   return -1;
+}
+
+libretro_vfs_implementation_file *retro_vfs_file_open_impl(const char *path, uint64_t mode)
+{
+   libretro_vfs_implementation_file *stream = (libretro_vfs_implementation_file*)calloc(1, sizeof(*stream));
+
+   if (!stream)
+      return NULL;
+
+   return stream;
+}
+
+int retro_vfs_file_close_impl(libretro_vfs_implementation_file *stream)
+{
+	return -1;
+}
+
+int retro_vfs_file_error_impl(libretro_vfs_implementation_file *stream)
+{
+   return 0;
+}
+
+int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream)
+{
+   return -1;
+}
+
+int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
+{
+	return -1;
+}
+
+int64_t retro_vfs_file_seek_impl(libretro_vfs_implementation_file *stream, int64_t offset)
+{
+	return retro_vfs_file_seek_internal(stream, offset, SEEK_SET);
+}
+
+int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream, void *s, uint64_t len)
+{
+	return -1;
+}
+
+int64_t retro_vfs_file_write_impl(libretro_vfs_implementation_file *stream, const void *s, uint64_t len)
+{
+	return -1;
+}
+
+int retro_vfs_file_flush_impl(libretro_vfs_implementation_file *stream)
+{
+	return 0;
+}
+
+int retro_vfs_file_delete_impl(const char *path)
+{
+   return 0;
+}
+
+const char *retro_vfs_file_get_path_impl(libretro_vfs_implementation_file *stream)
+{
+   return NULL;
+}
+