dolphin/Source/Core/DiscIO/VolumeDirectory.cpp

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// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <algorithm>
#include <cstddef>
#include <cstring>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "Common/CommonPaths.h"
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/MathUtil.h"
#include "DiscIO/FileBlob.h"
#include "DiscIO/FileMonitor.h"
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeDirectory.h"
namespace DiscIO
{
CVolumeDirectory::CVolumeDirectory(const std::string& _rDirectory, bool _bIsWii,
const std::string& _rApploader, const std::string& _rDOL)
: m_totalNameSize(0)
, m_dataStartAddress(-1)
, m_diskHeader(DISKHEADERINFO_ADDRESS)
, m_diskHeaderInfo(new SDiskHeaderInfo())
, m_fst_address(0)
, m_dol_address(0)
{
m_rootDirectory = ExtractDirectoryName(_rDirectory);
// create the default disk header
SetUniqueID("AGBJ01");
SetName("Default name");
if (_bIsWii)
{
SetDiskTypeWii();
}
else
{
SetDiskTypeGC();
}
// Don't load the dol if we've no apploader...
if (SetApploader(_rApploader))
SetDOL(_rDOL);
BuildFST();
}
CVolumeDirectory::~CVolumeDirectory()
{
}
bool CVolumeDirectory::IsValidDirectory(const std::string& _rDirectory)
{
std::string directoryName = ExtractDirectoryName(_rDirectory);
return File::IsDirectory(directoryName);
}
bool CVolumeDirectory::Read(u64 _Offset, u64 _Length, u8* _pBuffer, bool decrypt) const
{
if (!decrypt && (_Offset + _Length >= 0x400) && m_is_wii)
{
// Fully supporting this would require re-encrypting every file that's read.
// Only supporting the areas that IOS allows software to read could be more feasible.
// Currently, only the header (up to 0x400) is supported, though we're cheating a bit
// with it by reading the header inside the current partition instead. Supporting the
// header is enough for booting games, but not for running things like the Disc Channel.
return false;
}
if (decrypt && !m_is_wii)
PanicAlertT("Tried to decrypt data from a non-Wii volume");
// header
if (_Offset < DISKHEADERINFO_ADDRESS)
{
WriteToBuffer(DISKHEADER_ADDRESS, DISKHEADERINFO_ADDRESS, m_diskHeader.data(), _Offset, _Length, _pBuffer);
}
// header info
if (_Offset >= DISKHEADERINFO_ADDRESS && _Offset < APPLOADER_ADDRESS)
{
WriteToBuffer(DISKHEADERINFO_ADDRESS, sizeof(m_diskHeaderInfo), (u8*)m_diskHeaderInfo.get(), _Offset, _Length, _pBuffer);
}
// apploader
if (_Offset >= APPLOADER_ADDRESS && _Offset < APPLOADER_ADDRESS + m_apploader.size())
{
WriteToBuffer(APPLOADER_ADDRESS, m_apploader.size(), m_apploader.data(), _Offset, _Length, _pBuffer);
}
// dol
if (_Offset >= m_dol_address && _Offset < m_dol_address + m_DOL.size())
{
WriteToBuffer(m_dol_address, m_DOL.size(), m_DOL.data(), _Offset, _Length, _pBuffer);
}
// fst
if (_Offset >= m_fst_address && _Offset < m_dataStartAddress)
{
WriteToBuffer(m_fst_address, m_FSTData.size(), m_FSTData.data(), _Offset, _Length, _pBuffer);
}
if (m_virtualDisk.empty())
return true;
// Determine which file the offset refers to
std::map<u64, std::string>::const_iterator fileIter = m_virtualDisk.lower_bound(_Offset);
if (fileIter->first > _Offset && fileIter != m_virtualDisk.begin())
--fileIter;
// zero fill to start of file data
PadToAddress(fileIter->first, _Offset, _Length, _pBuffer);
while (fileIter != m_virtualDisk.end() && _Length > 0)
{
_dbg_assert_(DVDINTERFACE, fileIter->first <= _Offset);
u64 fileOffset = _Offset - fileIter->first;
const std::string fileName = fileIter->second;
std::unique_ptr<PlainFileReader> reader(PlainFileReader::Create(fileName));
if (reader == nullptr)
return false;
u64 fileSize = reader->GetDataSize();
FileMon::CheckFile(fileName, fileSize);
if (fileOffset < fileSize)
{
u64 fileBytes = fileSize - fileOffset;
if (_Length < fileBytes)
fileBytes = _Length;
if (!reader->Read(fileOffset, fileBytes, _pBuffer))
return false;
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_Length -= fileBytes;
_pBuffer += fileBytes;
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_Offset += fileBytes;
}
++fileIter;
if (fileIter != m_virtualDisk.end())
{
_dbg_assert_(DVDINTERFACE, fileIter->first >= _Offset);
PadToAddress(fileIter->first, _Offset, _Length, _pBuffer);
}
}
return true;
}
std::string CVolumeDirectory::GetUniqueID() const
{
static const size_t ID_LENGTH = 6;
return std::string(m_diskHeader.begin(), m_diskHeader.begin() + ID_LENGTH);
}
void CVolumeDirectory::SetUniqueID(const std::string& id)
{
size_t length = id.length();
if (length > 6)
length = 6;
memcpy(m_diskHeader.data(), id.c_str(), length);
}
IVolume::ECountry CVolumeDirectory::GetCountry() const
{
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u8 country_code = m_diskHeader[3];
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return CountrySwitch(country_code);
}
std::string CVolumeDirectory::GetMakerID() const
{
return "VOID";
}
std::string CVolumeDirectory::GetInternalName() const
{
char name[0x60];
if (Read(0x20, 0x60, (u8*)name, false))
return DecodeString(name);
else
return "";
}
std::map<IVolume::ELanguage, std::string> CVolumeDirectory::GetNames(bool prefer_long) const
{
std::map<IVolume::ELanguage, std::string> names;
std::string name = GetInternalName();
if (!name.empty())
names[IVolume::ELanguage::LANGUAGE_UNKNOWN] = name;
return names;
}
void CVolumeDirectory::SetName(const std::string& name)
{
size_t length = name.length();
if (length > MAX_NAME_LENGTH)
length = MAX_NAME_LENGTH;
memcpy(&m_diskHeader[0x20], name.c_str(), length);
m_diskHeader[length + 0x20] = 0;
}
u32 CVolumeDirectory::GetFSTSize() const
{
return 0;
}
std::string CVolumeDirectory::GetApploaderDate() const
{
return "VOID";
}
IVolume::EPlatform CVolumeDirectory::GetVolumeType() const
{
return m_is_wii ? WII_DISC : GAMECUBE_DISC;
}
u64 CVolumeDirectory::GetSize() const
{
return 0;
}
u64 CVolumeDirectory::GetRawSize() const
{
return GetSize();
}
std::string CVolumeDirectory::ExtractDirectoryName(const std::string& _rDirectory)
{
std::string directoryName = _rDirectory;
size_t lastSep = directoryName.find_last_of(DIR_SEP_CHR);
if (lastSep != directoryName.size() - 1)
{
// TODO: This assumes that file names will always have a dot in them
// and directory names never will; both assumptions are often
// right but in general wrong.
size_t extensionStart = directoryName.find_last_of('.');
if (extensionStart != std::string::npos && extensionStart > lastSep)
{
directoryName.resize(lastSep);
}
}
else
{
directoryName.resize(lastSep);
}
return directoryName;
}
void CVolumeDirectory::SetDiskTypeWii()
{
m_diskHeader[0x18] = 0x5d;
m_diskHeader[0x19] = 0x1c;
m_diskHeader[0x1a] = 0x9e;
m_diskHeader[0x1b] = 0xa3;
memset(&m_diskHeader[0x1c], 0, 4);
m_is_wii = true;
m_addressShift = 2;
}
void CVolumeDirectory::SetDiskTypeGC()
{
memset(&m_diskHeader[0x18], 0, 4);
m_diskHeader[0x1c] = 0xc2;
m_diskHeader[0x1d] = 0x33;
m_diskHeader[0x1e] = 0x9f;
m_diskHeader[0x1f] = 0x3d;
m_is_wii = false;
m_addressShift = 0;
}
bool CVolumeDirectory::SetApploader(const std::string& _rApploader)
{
if (!_rApploader.empty())
{
std::string data;
if (!File::ReadFileToString(_rApploader, data))
{
PanicAlertT("Apploader unable to load from file");
return false;
}
size_t apploaderSize = 0x20 + Common::swap32(*(u32*)&data.data()[0x14]) + Common::swap32(*(u32*)&data.data()[0x18]);
if (apploaderSize != data.size())
{
PanicAlertT("Apploader is the wrong size...is it really an apploader?");
return false;
}
m_apploader.resize(apploaderSize);
std::copy(data.begin(), data.end(), m_apploader.begin());
// 32byte aligned (plus 0x20 padding)
m_dol_address = ROUND_UP(APPLOADER_ADDRESS + m_apploader.size() + 0x20, 0x20ull);
return true;
}
else
{
m_apploader.resize(0x20);
// Make sure BS2 HLE doesn't try to run the apploader
*(u32*)&m_apploader[0x10] = (u32)-1;
return false;
}
}
void CVolumeDirectory::SetDOL(const std::string& rDOL)
{
if (!rDOL.empty())
{
std::string data;
File::ReadFileToString(rDOL, data);
m_DOL.resize(data.size());
std::copy(data.begin(), data.end(), m_DOL.begin());
Write32((u32)(m_dol_address >> m_addressShift), 0x0420, &m_diskHeader);
// 32byte aligned (plus 0x20 padding)
m_fst_address = ROUND_UP(m_dol_address + m_DOL.size() + 0x20, 0x20ull);
}
}
void CVolumeDirectory::BuildFST()
{
m_FSTData.clear();
File::FSTEntry rootEntry;
// read data from physical disk to rootEntry
u64 totalEntries = AddDirectoryEntries(m_rootDirectory, rootEntry) + 1;
m_fstNameOffset = totalEntries * ENTRY_SIZE; // offset in FST nameTable
m_FSTData.resize(m_fstNameOffset + m_totalNameSize);
// if FST hasn't been assigned (ie no apploader/dol setup), set to default
if (m_fst_address == 0)
m_fst_address = APPLOADER_ADDRESS + 0x2000;
// 4 byte aligned start of data on disk
m_dataStartAddress = ROUND_UP(m_fst_address + m_FSTData.size(), 0x8000ull);
u64 curDataAddress = m_dataStartAddress;
u32 fstOffset = 0; // Offset within FST data
u32 nameOffset = 0; // Offset within name table
u32 rootOffset = 0; // Offset of root of FST
// write root entry
WriteEntryData(fstOffset, DIRECTORY_ENTRY, 0, 0, totalEntries);
for (auto& entry : rootEntry.children)
{
WriteEntry(entry, fstOffset, nameOffset, curDataAddress, rootOffset);
}
// overflow check
_dbg_assert_(DVDINTERFACE, nameOffset == m_totalNameSize);
// write FST size and location
Write32((u32)(m_fst_address >> m_addressShift), 0x0424, &m_diskHeader);
Write32((u32)(m_FSTData.size() >> m_addressShift), 0x0428, &m_diskHeader);
Write32((u32)(m_FSTData.size() >> m_addressShift), 0x042c, &m_diskHeader);
}
void CVolumeDirectory::WriteToBuffer(u64 _SrcStartAddress, u64 _SrcLength, const u8* _Src,
u64& _Address, u64& _Length, u8*& _pBuffer) const
{
if (_Length == 0)
return;
_dbg_assert_(DVDINTERFACE, _Address >= _SrcStartAddress);
u64 srcOffset = _Address - _SrcStartAddress;
if (srcOffset < _SrcLength)
{
u64 srcBytes = _SrcLength - srcOffset;
if (_Length < srcBytes)
srcBytes = _Length;
memcpy(_pBuffer, _Src + srcOffset, (size_t)srcBytes);
_Length -= srcBytes;
_pBuffer += srcBytes;
_Address += srcBytes;
}
}
void CVolumeDirectory::PadToAddress(u64 _StartAddress, u64& _Address, u64& _Length, u8*& _pBuffer) const
{
if (_StartAddress <= _Address)
return;
u64 padBytes = _StartAddress - _Address;
if (padBytes > _Length)
padBytes = _Length;
if (_Length > 0)
{
memset(_pBuffer, 0, (size_t)padBytes);
_Length -= padBytes;
_pBuffer += padBytes;
_Address += padBytes;
}
}
void CVolumeDirectory::Write32(u32 data, u32 offset, std::vector<u8>* const buffer)
{
(*buffer)[offset++] = (data >> 24);
(*buffer)[offset++] = (data >> 16) & 0xff;
(*buffer)[offset++] = (data >> 8) & 0xff;
(*buffer)[offset] = (data) & 0xff;
}
void CVolumeDirectory::WriteEntryData(u32& entryOffset, u8 type, u32 nameOffset, u64 dataOffset, u64 length)
{
m_FSTData[entryOffset++] = type;
m_FSTData[entryOffset++] = (nameOffset >> 16) & 0xff;
m_FSTData[entryOffset++] = (nameOffset >> 8) & 0xff;
m_FSTData[entryOffset++] = (nameOffset) & 0xff;
Write32((u32)(dataOffset >> m_addressShift), entryOffset, &m_FSTData);
entryOffset += 4;
Write32((u32)length, entryOffset, &m_FSTData);
entryOffset += 4;
}
void CVolumeDirectory::WriteEntryName(u32& nameOffset, const std::string& name)
{
strncpy((char*)&m_FSTData[nameOffset + m_fstNameOffset], name.c_str(), name.length() + 1);
nameOffset += (u32)(name.length() + 1);
}
void CVolumeDirectory::WriteEntry(const File::FSTEntry& entry, u32& fstOffset, u32& nameOffset, u64& dataOffset, u32 parentEntryNum)
{
if (entry.isDirectory)
{
u32 myOffset = fstOffset;
u32 myEntryNum = myOffset / ENTRY_SIZE;
WriteEntryData(fstOffset, DIRECTORY_ENTRY, nameOffset, parentEntryNum, myEntryNum + entry.size + 1);
WriteEntryName(nameOffset, entry.virtualName);
for (const auto& child : entry.children)
{
WriteEntry(child, fstOffset, nameOffset, dataOffset, myEntryNum);
}
}
else
{
// put entry in FST
WriteEntryData(fstOffset, FILE_ENTRY, nameOffset, dataOffset, entry.size);
WriteEntryName(nameOffset, entry.virtualName);
// write entry to virtual disk
_dbg_assert_(DVDINTERFACE, m_virtualDisk.find(dataOffset) == m_virtualDisk.end());
m_virtualDisk.insert(make_pair(dataOffset, entry.physicalName));
// 4 byte aligned
dataOffset = ROUND_UP(dataOffset + entry.size, 0x8000ull);
}
}
static u32 ComputeNameSize(const File::FSTEntry& parentEntry)
{
u32 nameSize = 0;
const std::vector<File::FSTEntry>& children = parentEntry.children;
for (auto it = children.cbegin(); it != children.cend(); ++it)
{
const File::FSTEntry& entry = *it;
if (entry.isDirectory)
{
nameSize += ComputeNameSize(entry);
}
nameSize += (u32)entry.virtualName.length() + 1;
}
return nameSize;
}
u64 CVolumeDirectory::AddDirectoryEntries(const std::string& _Directory, File::FSTEntry& parentEntry)
{
parentEntry = File::ScanDirectoryTree(_Directory, true);
m_totalNameSize += ComputeNameSize(parentEntry);
return parentEntry.size;
}
} // namespace