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https://github.com/dolphin-emu/dolphin.git
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360 lines
9.4 KiB
C++
360 lines
9.4 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <cinttypes>
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#include <cstddef>
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#include <cstring>
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#include <string>
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#include <vector>
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#include "Common/CommonTypes.h"
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#include "Common/FileUtil.h"
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#include "Common/Logging/Log.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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#include "DiscIO/FileSystemGCWii.h"
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#include "DiscIO/Filesystem.h"
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#include "DiscIO/Volume.h"
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namespace DiscIO
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{
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CFileSystemGCWii::CFileSystemGCWii(const IVolume* _rVolume)
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: IFileSystem(_rVolume), m_Initialized(false), m_Valid(false), m_Wii(false)
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{
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m_Valid = DetectFileSystem();
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}
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CFileSystemGCWii::~CFileSystemGCWii()
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{
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m_FileInfoVector.clear();
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}
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u64 CFileSystemGCWii::GetFileSize(const std::string& _rFullPath)
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{
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if (!m_Initialized)
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InitFileSystem();
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const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);
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if (pFileInfo != nullptr && !pFileInfo->IsDirectory())
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return pFileInfo->m_FileSize;
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return 0;
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}
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std::string CFileSystemGCWii::GetFileName(u64 _Address)
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{
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if (!m_Initialized)
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InitFileSystem();
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for (auto& fileInfo : m_FileInfoVector)
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{
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if ((fileInfo.m_Offset <= _Address) && ((fileInfo.m_Offset + fileInfo.m_FileSize) > _Address))
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{
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return fileInfo.m_FullPath;
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}
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}
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return "";
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}
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u64 CFileSystemGCWii::ReadFile(const std::string& _rFullPath, u8* _pBuffer, u64 _MaxBufferSize,
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u64 _OffsetInFile)
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{
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if (!m_Initialized)
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InitFileSystem();
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const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);
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if (pFileInfo == nullptr)
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return 0;
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if (_OffsetInFile >= pFileInfo->m_FileSize)
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return 0;
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u64 read_length = std::min(_MaxBufferSize, pFileInfo->m_FileSize - _OffsetInFile);
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DEBUG_LOG(DISCIO, "Reading %" PRIx64 " bytes at %" PRIx64 " from file %s. Offset: %" PRIx64
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" Size: %" PRIx64,
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read_length, _OffsetInFile, _rFullPath.c_str(), pFileInfo->m_Offset,
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pFileInfo->m_FileSize);
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m_rVolume->Read(pFileInfo->m_Offset + _OffsetInFile, read_length, _pBuffer, m_Wii);
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return read_length;
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}
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bool CFileSystemGCWii::ExportFile(const std::string& _rFullPath,
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const std::string& _rExportFilename)
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{
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if (!m_Initialized)
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InitFileSystem();
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const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);
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if (!pFileInfo)
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return false;
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u64 remainingSize = pFileInfo->m_FileSize;
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u64 fileOffset = pFileInfo->m_Offset;
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File::IOFile f(_rExportFilename, "wb");
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if (!f)
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return false;
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bool result = true;
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while (remainingSize)
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{
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// Limit read size to 128 MB
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size_t readSize = (size_t)std::min(remainingSize, (u64)0x08000000);
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std::vector<u8> buffer(readSize);
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result = m_rVolume->Read(fileOffset, readSize, &buffer[0], m_Wii);
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if (!result)
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break;
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f.WriteBytes(&buffer[0], readSize);
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remainingSize -= readSize;
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fileOffset += readSize;
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}
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return result;
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}
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bool CFileSystemGCWii::ExportApploader(const std::string& _rExportFolder) const
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{
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u32 apploader_size;
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u32 trailer_size;
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const u32 header_size = 0x20;
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if (!m_rVolume->ReadSwapped(0x2440 + 0x14, &apploader_size, m_Wii) ||
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!m_rVolume->ReadSwapped(0x2440 + 0x18, &trailer_size, m_Wii))
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return false;
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apploader_size += trailer_size + header_size;
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DEBUG_LOG(DISCIO, "Apploader size -> %x", apploader_size);
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std::vector<u8> buffer(apploader_size);
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if (m_rVolume->Read(0x2440, apploader_size, buffer.data(), m_Wii))
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{
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std::string exportName(_rExportFolder + "/apploader.img");
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File::IOFile AppFile(exportName, "wb");
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if (AppFile)
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{
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AppFile.WriteBytes(buffer.data(), apploader_size);
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return true;
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}
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}
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return false;
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}
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u64 CFileSystemGCWii::GetBootDOLOffset() const
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{
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u32 offset = 0;
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m_rVolume->ReadSwapped(0x420, &offset, m_Wii);
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return static_cast<u64>(offset) << GetOffsetShift();
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}
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u32 CFileSystemGCWii::GetBootDOLSize(u64 dol_offset) const
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{
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// The dol_offset value is usually obtained by calling GetBootDOLOffset.
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// If GetBootDOLOffset fails by returning 0, GetBootDOLSize should also fail.
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if (dol_offset == 0)
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return 0;
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u32 dol_size = 0;
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u32 offset = 0;
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u32 size = 0;
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// Iterate through the 7 code segments
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for (u8 i = 0; i < 7; i++)
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{
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if (!m_rVolume->ReadSwapped(dol_offset + 0x00 + i * 4, &offset, m_Wii) ||
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!m_rVolume->ReadSwapped(dol_offset + 0x90 + i * 4, &size, m_Wii))
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return 0;
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dol_size = std::max(offset + size, dol_size);
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}
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// Iterate through the 11 data segments
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for (u8 i = 0; i < 11; i++)
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{
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if (!m_rVolume->ReadSwapped(dol_offset + 0x1c + i * 4, &offset, m_Wii) ||
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!m_rVolume->ReadSwapped(dol_offset + 0xac + i * 4, &size, m_Wii))
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return 0;
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dol_size = std::max(offset + size, dol_size);
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}
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return dol_size;
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}
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bool CFileSystemGCWii::ExportDOL(const std::string& _rExportFolder) const
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{
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u64 DolOffset = GetBootDOLOffset();
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u32 DolSize = GetBootDOLSize(DolOffset);
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if (DolOffset == 0 || DolSize == 0)
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return false;
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std::vector<u8> buffer(DolSize);
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if (m_rVolume->Read(DolOffset, DolSize, &buffer[0], m_Wii))
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{
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std::string exportName(_rExportFolder + "/boot.dol");
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File::IOFile DolFile(exportName, "wb");
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if (DolFile)
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{
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DolFile.WriteBytes(&buffer[0], DolSize);
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return true;
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}
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}
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return false;
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}
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std::string CFileSystemGCWii::GetStringFromOffset(u64 _Offset) const
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{
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std::string data(255, 0x00);
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m_rVolume->Read(_Offset, data.size(), (u8*)&data[0], m_Wii);
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data.erase(std::find(data.begin(), data.end(), 0x00), data.end());
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// TODO: Should we really always use SHIFT-JIS?
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// It makes some filenames in Pikmin (NTSC-U) sane, but is it correct?
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return SHIFTJISToUTF8(data);
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}
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const std::vector<SFileInfo>& CFileSystemGCWii::GetFileList()
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{
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if (!m_Initialized)
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InitFileSystem();
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return m_FileInfoVector;
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}
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const SFileInfo* CFileSystemGCWii::FindFileInfo(const std::string& _rFullPath)
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{
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if (!m_Initialized)
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InitFileSystem();
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for (auto& fileInfo : m_FileInfoVector)
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{
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if (!strcasecmp(fileInfo.m_FullPath.c_str(), _rFullPath.c_str()))
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return &fileInfo;
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}
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return nullptr;
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}
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bool CFileSystemGCWii::DetectFileSystem()
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{
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u32 magic_bytes;
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if (m_rVolume->ReadSwapped(0x18, &magic_bytes, false) && magic_bytes == 0x5D1C9EA3)
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{
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m_Wii = true;
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return true;
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}
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else if (m_rVolume->ReadSwapped(0x1c, &magic_bytes, false) && magic_bytes == 0xC2339F3D)
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{
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m_Wii = false;
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return true;
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}
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return false;
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}
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void CFileSystemGCWii::InitFileSystem()
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{
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m_Initialized = true;
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u32 const shift = GetOffsetShift();
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// read the whole FST
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u32 fst_offset_unshifted;
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if (!m_rVolume->ReadSwapped(0x424, &fst_offset_unshifted, m_Wii))
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return;
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u64 FSTOffset = static_cast<u64>(fst_offset_unshifted) << shift;
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// read all fileinfos
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u32 name_offset, offset, size;
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if (!m_rVolume->ReadSwapped(FSTOffset + 0x0, &name_offset, m_Wii) ||
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!m_rVolume->ReadSwapped(FSTOffset + 0x4, &offset, m_Wii) ||
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!m_rVolume->ReadSwapped(FSTOffset + 0x8, &size, m_Wii))
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return;
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SFileInfo root = {name_offset, static_cast<u64>(offset) << shift, size};
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if (!root.IsDirectory())
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return;
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// 12 bytes (the size of a file entry) times 10 * 1024 * 1024 is 120 MiB,
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// more than total RAM in a Wii. No file system should use anywhere near that much.
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static const u32 ARBITRARY_FILE_SYSTEM_SIZE_LIMIT = 10 * 1024 * 1024;
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if (root.m_FileSize > ARBITRARY_FILE_SYSTEM_SIZE_LIMIT)
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{
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// Without this check, Dolphin can crash by trying to allocate too much
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// memory when loading the file systems of certain malformed disc images.
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ERROR_LOG(DISCIO, "File system is abnormally large! Aborting loading");
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return;
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}
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if (m_FileInfoVector.size())
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PanicAlert("Wtf?");
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u64 NameTableOffset = FSTOffset;
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m_FileInfoVector.reserve((size_t)root.m_FileSize);
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for (u32 i = 0; i < root.m_FileSize; i++)
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{
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const u64 read_offset = FSTOffset + (i * 0xC);
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name_offset = 0;
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m_rVolume->ReadSwapped(read_offset + 0x0, &name_offset, m_Wii);
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offset = 0;
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m_rVolume->ReadSwapped(read_offset + 0x4, &offset, m_Wii);
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size = 0;
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m_rVolume->ReadSwapped(read_offset + 0x8, &size, m_Wii);
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m_FileInfoVector.emplace_back(name_offset, static_cast<u64>(offset) << shift, size);
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NameTableOffset += 0xC;
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}
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BuildFilenames(1, m_FileInfoVector.size(), "", NameTableOffset);
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}
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size_t CFileSystemGCWii::BuildFilenames(const size_t _FirstIndex, const size_t _LastIndex,
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const std::string& _szDirectory, u64 _NameTableOffset)
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{
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size_t CurrentIndex = _FirstIndex;
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while (CurrentIndex < _LastIndex)
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{
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SFileInfo& rFileInfo = m_FileInfoVector[CurrentIndex];
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u64 const uOffset = _NameTableOffset + (rFileInfo.m_NameOffset & 0xFFFFFF);
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std::string const offset_str{GetStringFromOffset(uOffset)};
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bool const is_dir = rFileInfo.IsDirectory();
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rFileInfo.m_FullPath.reserve(_szDirectory.size() + offset_str.size());
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rFileInfo.m_FullPath.append(_szDirectory.data(), _szDirectory.size())
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.append(offset_str.data(), offset_str.size())
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.append("/", size_t(is_dir));
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if (!is_dir)
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{
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++CurrentIndex;
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continue;
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}
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// check next index
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CurrentIndex = BuildFilenames(CurrentIndex + 1, (size_t)rFileInfo.m_FileSize,
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rFileInfo.m_FullPath, _NameTableOffset);
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}
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return CurrentIndex;
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}
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u32 CFileSystemGCWii::GetOffsetShift() const
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{
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return m_Wii ? 2 : 0;
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}
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} // namespace
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