ppsspp/Core/Loaders.cpp

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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.
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// 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/.
#include "file/file_util.h"
#include "MIPS/MIPS.h"
#include "MIPS/MIPSCodeUtils.h"
#include "HLE/HLE.h"
#include "HLE/sceKernelModule.h"
#include "PSPLoaders.h"
#include "MemMap.h"
#include "Loaders.h"
#include "System.h"
// TODO : improve, look in the file more
EmuFileType Identify_File(std::string &filename)
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{
if (filename.size() < 5) {
ERROR_LOG(LOADER, "invalid filename %s", filename.c_str());
return FILETYPE_ERROR;
}
std::string extension = filename.substr(filename.size() - 4);
if (!strcasecmp(extension.c_str(),".iso"))
{
return FILETYPE_PSP_ISO;
}
else if (!strcasecmp(extension.c_str(),".cso"))
{
return FILETYPE_PSP_ISO;
}
// First, check if it's a directory with an EBOOT.PBP in it.
FileInfo info;
if (!getFileInfo(filename.c_str(), &info)) {
return FILETYPE_ERROR;
}
if (info.isDirectory) {
FileInfo ebootInfo;
// Check for existence of EBOOT.PBP, as required for "Directory games".
if (getFileInfo((filename + "/EBOOT.PBP").c_str(), &ebootInfo)) {
if (ebootInfo.exists) {
return FILETYPE_PSP_PBP_DIRECTORY;
}
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}
// check if it's a disc directory
if (getFileInfo((filename + "/PSP_GAME").c_str(), &ebootInfo)) {
if (ebootInfo.exists) {
return FILETYPE_PSP_DISC_DIRECTORY;
}
}
}
FILE *f = fopen(filename.c_str(), "rb");
if (!f) {
// File does not exists
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return FILETYPE_ERROR;
}
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u32 id;
size_t readSize = fread(&id, 4, 1, f);
if (readSize != 1) {
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fclose(f);
return FILETYPE_ERROR;
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}
u32 psar_offset = 0, psar_id = 0;
if (id == 'PBP\x00') {
fseek(f, 0x24, SEEK_SET);
fread(&psar_offset, 4, 1, f);
fseek(f, psar_offset, SEEK_SET);
fread(&psar_id, 4, 1, f);
}
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fclose(f);
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if (id == 'FLE\x7F')
{
// There are a few elfs misnamed as pbp (like Trig Wars), accept that.
if (!strcasecmp(extension.c_str(), ".plf") || strstr(filename.c_str(),"BOOT.BIN") ||
!strcasecmp(extension.c_str(), ".elf") || !strcasecmp(extension.c_str(), ".prx") ||
!strcasecmp(extension.c_str(), ".pbp"))
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{
return FILETYPE_PSP_ELF;
}
return FILETYPE_UNKNOWN_ELF;
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}
else if (id == 'PBP\x00')
{
if (psar_id == 'MUPN') {
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return FILETYPE_PSP_ISO_NP;
}
// Let's check if we got pointed to a PBP within such a directory.
// If so we just move up and return the directory itself as the game.
std::string path = getDir(filename);
// If loading from memstick...
size_t pos = path.find("/PSP/GAME/");
if (pos != std::string::npos) {
filename = path;
return FILETYPE_PSP_PBP_DIRECTORY;
}
return FILETYPE_PSP_PBP;
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}
else if (!strcasecmp(extension.c_str(),".pbp"))
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{
ERROR_LOG(LOADER, "A PBP with the wrong magic number?");
return FILETYPE_PSP_PBP;
}
else if (!strcasecmp(extension.c_str(),".bin"))
{
return FILETYPE_UNKNOWN_BIN;
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}
return FILETYPE_UNKNOWN;
}
bool LoadFile(std::string &filename, std::string *error_string) {
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INFO_LOG(LOADER,"Identifying file...");
// Note that this can modify filename!
switch (Identify_File(filename)) {
case FILETYPE_PSP_PBP_DIRECTORY:
{
std::string ebootFilename = filename + "/EBOOT.PBP";
FileInfo fileInfo;
getFileInfo((filename + "/EBOOT.PBP").c_str(), &fileInfo);
if (fileInfo.exists) {
INFO_LOG(LOADER, "File is a PBP in a directory!");
std::string path = filename;
size_t pos = path.find("/PSP/GAME/");
if (pos != std::string::npos)
pspFileSystem.SetStartingDirectory("ms0:" + path.substr(pos));
return Load_PSP_ELF_PBP(ebootFilename.c_str(), error_string);
} else {
*error_string = "No EBOOT.PBP, misidentified game";
return false;
}
}
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case FILETYPE_PSP_PBP:
case FILETYPE_PSP_ELF:
{
INFO_LOG(LOADER,"File is an ELF or loose PBP!");
return Load_PSP_ELF_PBP(filename.c_str(), error_string);
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}
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case FILETYPE_PSP_ISO:
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case FILETYPE_PSP_ISO_NP:
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case FILETYPE_PSP_DISC_DIRECTORY: // behaves the same as the mounting is already done by now
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pspFileSystem.SetStartingDirectory("disc0:/PSP_GAME/USRDIR");
return Load_PSP_ISO(filename.c_str(), error_string);
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case FILETYPE_ERROR:
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ERROR_LOG(LOADER, "Could not read file");
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*error_string = "Error reading file";
break;
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case FILETYPE_UNKNOWN_BIN:
case FILETYPE_UNKNOWN_ELF:
case FILETYPE_UNKNOWN:
default:
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ERROR_LOG(LOADER, "Failed to identify file");
*error_string = "Failed to identify file";
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break;
}
return false;
}