ppsspp/Core/FileSystems/VirtualDiscFileSystem.h

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// Copyright (c) 2012- PPSSPP Project.
// 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, version 2.0 or later versions.
// 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 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#pragma once
// TODO: Remove the Windows-specific code, FILE is fine there too.
#include <map>
#include "Core/FileSystems/FileSystem.h"
#include "Core/FileSystems/DirectoryFileSystem.h"
class VirtualDiscFileSystem: public IFileSystem {
public:
VirtualDiscFileSystem(IHandleAllocator *_hAlloc, std::string _basePath);
~VirtualDiscFileSystem();
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void DoState(PointerWrap &p) override;
u32 OpenFile(std::string filename, FileAccess access, const char *devicename=NULL) override;
size_t SeekFile(u32 handle, s32 position, FileMove type) override;
size_t ReadFile(u32 handle, u8 *pointer, s64 size) override;
size_t ReadFile(u32 handle, u8 *pointer, s64 size, int &usec) override;
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void CloseFile(u32 handle) override;
PSPFileInfo GetFileInfo(std::string filename) override;
bool OwnsHandle(u32 handle) override;
int Ioctl(u32 handle, u32 cmd, u32 indataPtr, u32 inlen, u32 outdataPtr, u32 outlen, int &usec) override;
int DevType(u32 handle) override;
bool GetHostPath(const std::string &inpath, std::string &outpath) override;
std::vector<PSPFileInfo> GetDirListing(std::string path) override;
int Flags() override { return 0; }
u64 FreeSpace(const std::string &path) override { return 0; }
// unsupported operations
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size_t WriteFile(u32 handle, const u8 *pointer, s64 size) override;
size_t WriteFile(u32 handle, const u8 *pointer, s64 size, int &usec) override;
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bool MkDir(const std::string &dirname) override;
bool RmDir(const std::string &dirname) override;
int RenameFile(const std::string &from, const std::string &to) override;
bool RemoveFile(const std::string &filename) override;
private:
void LoadFileListIndex();
int getFileListIndex(std::string& fileName);
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int getFileListIndex(u32 accessBlock, u32 accessSize, bool blockMode = false);
std::string GetLocalPath(std::string localpath);
typedef void *HandlerLibrary;
typedef int HandlerHandle;
typedef s64 HandlerOffset;
typedef void (*HandlerLogFunc)(void *arg, HandlerHandle handle, LogTypes::LOG_LEVELS level, const char *msg);
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static void HandlerLogger(void *arg, HandlerHandle handle, LogTypes::LOG_LEVELS level, const char *msg);
// The primary purpose of handlers is to make it easier to work with large archives.
// However, they have other uses as well, such as patching individual files.
struct Handler {
Handler(const char *filename, VirtualDiscFileSystem *const sys);
~Handler();
typedef bool (*InitFunc)(HandlerLogFunc logger, void *loggerArg);
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typedef void (*ShutdownFunc)();
typedef HandlerHandle (*OpenFunc)(const char *basePath, const char *filename);
typedef HandlerOffset (*SeekFunc)(HandlerHandle handle, HandlerOffset offset, FileMove origin);
typedef HandlerOffset (*ReadFunc)(HandlerHandle handle, void *data, HandlerOffset size);
typedef void (*CloseFunc)(HandlerHandle handle);
HandlerLibrary library;
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InitFunc Init;
ShutdownFunc Shutdown;
OpenFunc Open;
SeekFunc Seek;
ReadFunc Read;
CloseFunc Close;
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bool IsValid() const { return library != NULL; }
};
struct HandlerFileHandle {
Handler *handler;
HandlerHandle handle;
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HandlerFileHandle() : handler(NULL), handle(0) {
}
HandlerFileHandle(Handler *handler_) : handler(handler_), handle(-1) {
}
bool Open(std::string& basePath, std::string& fileName, FileAccess access) {
// Ignore access, read only.
handle = handler->Open(basePath.c_str(), fileName.c_str());
return handle > 0;
}
size_t Read(u8 *data, s64 size) {
return (size_t)handler->Read(handle, data, size);
}
size_t Seek(s32 position, FileMove type) {
return (size_t)handler->Seek(handle, position, type);
}
void Close() {
handler->Close(handle);
}
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bool IsValid() {
return handler != NULL && handler->IsValid();
}
HandlerFileHandle &operator =(Handler *_handler) {
handler = _handler;
return *this;
}
};
typedef enum { VFILETYPE_NORMAL, VFILETYPE_LBN, VFILETYPE_ISO } VirtualFileType;
struct OpenFileEntry {
DirectoryFileHandle hFile;
HandlerFileHandle handler;
VirtualFileType type;
u32 fileIndex;
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u64 curOffset;
u64 startOffset; // only used by lbn files
u64 size; // only used by lbn files
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bool Open(std::string& basePath, std::string& fileName, FileAccess access) {
// Ignored, we're read only.
u32 err;
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if (handler.IsValid()) {
return handler.Open(basePath, fileName, access);
} else {
return hFile.Open(basePath, fileName, access, err);
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}
}
size_t Read(u8 *data, s64 size) {
if (handler.IsValid()) {
return handler.Read(data, size);
} else {
return hFile.Read(data, size);
}
}
size_t Seek(s32 position, FileMove type) {
if (handler.IsValid()) {
return handler.Seek(position, type);
} else {
return hFile.Seek(position, type);
}
}
void Close() {
if (handler.IsValid()) {
return handler.Close();
} else {
return hFile.Close();
}
}
};
typedef std::map<u32, OpenFileEntry> EntryMap;
EntryMap entries;
IHandleAllocator *hAlloc;
std::string basePath;
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struct FileListEntry {
std::string fileName;
u32 firstBlock;
u32 totalSize;
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Handler *handler;
};
std::vector<FileListEntry> fileList;
u32 currentBlockIndex;
u32 lastReadBlock_;
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std::map<std::string, Handler *> handlers;
};