mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-10-22 02:39:05 +02:00
Francisco José García García
d037ca1b7b
GetSubFile() reads a whole subfile, and refuses those over 256MB. ReadSubFile() reads a range of one, for the PSAR of a PS1 EBOOT, which holds its disc image.
124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
// Copyright (c) 2013- PPSSPP Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// 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,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#include <string>
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#include <cstring>
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#include "Common/Log.h"
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#include "Core/Loaders.h"
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#include "Core/ELF/PBPReader.h"
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PBPReader::PBPReader(FileLoader *fileLoader) {
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if (!fileLoader->Exists()) {
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ERROR_LOG(Log::Loader, "Failed to open PBP file %s", fileLoader->GetPath().c_str());
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return;
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}
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fileSize_ = (size_t)fileLoader->FileSize();
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if (fileLoader->ReadAt(0, sizeof(header_), &header_) != sizeof(header_)) {
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ERROR_LOG(Log::Loader, "PBP is too small to be valid: %s", fileLoader->GetPath().c_str());
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return;
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}
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if (memcmp(header_.magic, "\0PBP", 4) != 0) {
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// Split string so the \x7f escape doesn't swallow the E. This used to compare against
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// "\nFLE", which is neither ELF's magic nor anything else - so every file that wasn't a PBP
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// was reported as an ELF, and the error branch below was unreachable.
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if (memcmp(header_.magic, "\x7f" "ELF", 4) == 0) {
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VERBOSE_LOG(Log::Loader, "%s: File actually an ELF, not a PBP", fileLoader->GetPath().c_str());
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isELF_ = true;
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} else {
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ERROR_LOG(Log::Loader, "Magic number in %s indicates neither PBP nor ELF: %02x %02x %02x %02x",
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fileLoader->GetPath().c_str(), (u8)header_.magic[0], (u8)header_.magic[1], (u8)header_.magic[2], (u8)header_.magic[3]);
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}
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return;
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}
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VERBOSE_LOG(Log::Loader, "Loading PBP, version = %08x", header_.version);
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file_ = fileLoader;
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}
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bool PBPReader::GetSubFile(PBPSubFile file, std::vector<u8> *out) const {
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if (!file_) {
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return false;
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}
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const size_t expected = GetSubFileSize(file);
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// This is only used to get the PARAM.SFO, so let's have a strict 256MB file size limit for sanity.
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if (expected > 256 * 1024 * 1024) {
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ERROR_LOG(Log::Loader, "Bad subfile size: %d", (int)expected);
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return false;
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}
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const u32 off = header_.offsets[(int)file];
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out->resize(expected);
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if (expected == 0)
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return true;
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size_t bytes = file_->ReadAt(off, expected, out->data());
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if (bytes != expected) {
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ERROR_LOG(Log::Loader, "PBP file read truncated: %d -> %d", (int)expected, (int)bytes);
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if (bytes < expected) {
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out->resize(bytes);
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}
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}
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return true;
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}
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bool PBPReader::ReadSubFile(PBPSubFile file, u32 offset, size_t size, void *out) const {
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if (!file_) {
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return false;
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}
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const size_t subFileSize = GetSubFileSize(file);
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if (offset > subFileSize || size > subFileSize - offset) {
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return false;
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}
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return file_->ReadAt(header_.offsets[(int)file] + offset, size, out) == size;
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}
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bool PBPReader::GetSubFileAsString(PBPSubFile file, std::string *out) const {
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if (!file_) {
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out->clear();
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return false;
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}
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const size_t expected = GetSubFileSize(file);
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// This is only used to get the PNG, AT3 etc, so let's have a strict 256MB file size limit for sanity.
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if (expected > 256 * 1024 * 1024) {
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ERROR_LOG(Log::Loader, "Bad subfile size: %d", (int)expected);
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return false;
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}
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const u32 off = header_.offsets[(int)file];
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out->resize(expected);
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size_t bytes = file_->ReadAt(off, expected, (void *)out->data());
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if (bytes != expected) {
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ERROR_LOG(Log::Loader, "PBP file read truncated: %d -> %d", (int)expected, (int)bytes);
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if (bytes < expected) {
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out->resize(bytes);
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// should we still return true here?
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}
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}
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return true;
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}
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PBPReader::~PBPReader() {
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// Does not take ownership.
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file_ = nullptr;
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}
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