ppsspp/Core/Loaders.h

// 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

#include <string>
#include <memory>

#include "Common/CommonTypes.h"
#include "Common/File/Path.h"
#include "Common/File/VFS/ZipFileReader.h"

enum class IdentifiedFileType {
	ERROR_IDENTIFYING,

	PSP_PBP_DIRECTORY,

	PSP_PBP,
	PSP_ELF,
	PSP_ISO,
	PSP_ISO_NP,

	PSP_DISC_DIRECTORY,

	// Try to reduce support emails...
	ARCHIVE_RAR,
	ARCHIVE_ZIP,
	ARCHIVE_7Z,
	// A .pkg game update - a container we install from rather than boot. See Core/Util/PkgUnpack.h.
	PSP_PKG,
	PSP_PS1_PBP,
	PSX_ISO,
	PS2_ISO,
	PS3_ISO,
	PSP_UMD_VIDEO_ISO,

	UNKNOWN_BIN,
	UNKNOWN_ELF,
	UNKNOWN_ISO,

	NORMAL_DIRECTORY,

	PSP_SAVEDATA_DIRECTORY,
	PPSSPP_SAVESTATE,

	PPSSPP_GE_DUMP,

	UNKNOWN,
};

const char *IdentifiedFileTypeToString(IdentifiedFileType type);

// NB: It is a REQUIREMENT that implementations of this class are entirely thread safe!
// TODO: actually, is it really?
class FileLoader {
public:
	enum class Flags {
		NONE,
		// Not necessary to read from / store into cache.
		HINT_UNCACHED,
	};

	virtual ~FileLoader() {}

	virtual bool IsRemote() {
		return false;
	}
	virtual bool Exists() = 0;  // This is permitted to essentially be "IsReadable" and not actually report existence (let's say the permissions are wrong, for example...)
	virtual bool ExistsFast() {
		return Exists();
	}
	virtual bool IsDirectory() = 0;
	virtual s64 FileSize() = 0;
	virtual Path GetPath() const = 0;
	virtual std::string GetFileExtension() const {
		return GetPath().GetFileExtension();
	}
	virtual size_t ReadAt(s64 absolutePos, size_t bytes, size_t count, void *data, Flags flags = Flags::NONE) = 0;
	virtual size_t ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags = Flags::NONE) {
		return ReadAt(absolutePos, 1, bytes, data, flags);
	}

	// Cancel any operations that might block, if possible.
	virtual void Cancel() {}

	virtual std::string LatestError() const {
		return "";
	}
};

class ProxiedFileLoader : public FileLoader {
public:
	ProxiedFileLoader(FileLoader *backend) : backend_(backend) {}
	~ProxiedFileLoader() {
		// Takes ownership.
		delete backend_;
	}
	bool IsRemote() override {
		return backend_->IsRemote();
	}
	bool Exists() override {
		return backend_->Exists();
	}
	bool ExistsFast() override {
		return backend_->ExistsFast();
	}
	bool IsDirectory() override {
		return backend_->IsDirectory();
	}
	s64 FileSize() override {
		return backend_->FileSize();
	}
	Path GetPath() const override {
		return backend_->GetPath();
	}
	void Cancel() override {
		backend_->Cancel();
	}
	std::string LatestError() const override {
		return backend_->LatestError();
	}
	size_t ReadAt(s64 absolutePos, size_t bytes, size_t count, void *data, Flags flags = Flags::NONE) override {
		return backend_->ReadAt(absolutePos, bytes, count, data, flags);
	}
	size_t ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags = Flags::NONE) override {
		return backend_->ReadAt(absolutePos, bytes, data, flags);
	}
	FileLoader *Steal() {
		FileLoader *backend = backend_;
		backend_ = nullptr;
		return backend;
	}

protected:
	FileLoader *backend_;
};

inline u32 operator & (const FileLoader::Flags &a, const FileLoader::Flags &b) {
	return (u32)a & (u32)b;
}

FileLoader *ConstructFileLoader(const Path &filename);
// Identifies the file and resolves to the target binary, ISO, or other file (e.g. from a directory.)
FileLoader *ResolveFileLoaderTarget(FileLoader *fileLoader, IdentifiedFileType *fileType, std::string *errorString);

Path ResolvePBPDirectory(const Path &filename);
Path ResolvePBPFile(const Path &filename);

IdentifiedFileType Identify_File(FileLoader *fileLoader, std::string *errorString);

bool UmdReplace(const Path &filepath, FileLoader **fileLoader, std::string &error);
// Mounts a disc image at umd0:, umd1:, umd: and disc0:, whether or not one was there.
bool UmdMount(const Path &filepath, FileLoader **fileLoader, std::string &error);

class IFileSystem;
// What a disc holds, as PSP_UMD_TYPE_* bits (game, video, audio), or 0 if it's none of those.
// root is prepended to the disc's paths, so "disc0:" reads the mounted disc through pspFileSystem.
u32 DetectUmdDiscType(IFileSystem *fs, std::string_view root);
// The same for a disc image file. 0 if it can't be opened as one.
u32 DetectUmdDiscType(FileLoader *fileLoader);
// Whether the image's PSP_GAME has an actual executable. The EUR Video Demo Disc lists a game
// (UMD_DATA.BIN says GVA) whose EBOOT.BIN and BOOT.BIN are all zeroes.
bool UmdHasBootableGame(FileLoader *fileLoader);

enum class ArchiveType {
	ZIP,
	SevenZ,
};

enum class ZipFileContents {
	NOT_A_ZIP_FILE = 0,
	UNKNOWN,
	PSP_GAME_DIR,
	ISO_FILE,
	TEXTURE_PACK,
	SAVE_DATA,
	FRAME_DUMP,
	EXTRACTED_GAME,
	SAVE_STATES,
	PRX_PLUGIN,
};

// TODO: Rename to ArchiveContentsInfo or something.
struct ZipFileInfo {
	ArchiveType archiveType;
	ZipFileContents contents = ZipFileContents::NOT_A_ZIP_FILE;
	int numFiles = 0;
	int stripChars = 0;  // for PSP game - how much to strip from the path.
	int isoFileIndex = -1;  // for ISO
	int textureIniIndex = -1;  // for textures
	bool ignoreMetaFiles = false;
	bool saveDataInRoot = false;  // for SAVE_DATA - the files of a single save are in the root, extract into savedataDir.
	std::string gameTitle;  // from PARAM.SFO if available
	std::string savedataTitle;
	std::string savedataDetails;
	std::string savedataDir;
	std::string mTime;
	std::string iniContents;
	std::string isoFilename; // Used by SevenZ only right now.
	s64 totalFileSize = 0;

	std::string contentName;
};

ZipContainer ZipOpenPath(const Path &fileName);
void ZipClose(ZipContainer &z);

void DetectZipFileContents(zip_t *z, ZipFileInfo *info);
bool DetectArchiveContents(VFSInterface *vfs, ZipFileInfo *info);