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dolphin/Source/Core/DiscIO/Src/DiscScrubber.cpp

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// Copyright (C) 2003-2009 Dolphin 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.
// 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 SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "stdafx.h"
#include "Filesystem.h"
#include "VolumeCreator.h"
#include "FileUtil.h"
#include "DiscScrubber.h"
namespace DiscIO
{
namespace DiscScrubber
{
#define SCRUBBER_VERSION 1
#define CLUSTER_SIZE 0x8000
u8* m_Sector1;
u8* m_FreeTable;
u64 m_FileSize;
std::string m_Filename;
IVolume* m_Disc = NULL;
struct SPartitionHeader
{
u8* Ticket[0x2a4];
u32 TMDSize;
u64 TMDOffset;
u32 CertChainSize;
u64 CertChainOffset;
// H3Size is always 0x18000
u64 H3Offset;
u64 DataOffset;
u64 DataSize;
// TMD would be here
u64 DOLOffset;
u64 DOLSize;
u64 FSTOffset;
u64 FSTSize;
u32 ApploaderSize;
u32 ApploaderTrailerSize;
};
struct SPartition
{
u32 GroupNumber;
u32 Number;
u64 Offset;
u32 Type;
SPartitionHeader Header;
};
struct SPartitionGroup
{
u32 numPartitions;
u64 PartitionsOffset;
std::vector<SPartition> PartitionsVec;
};
SPartitionGroup PartitionGroup[4];
void MarkAsUsed(u64 _Offset, u64 _Size);
void MarkAsUsedE(u64 _PartitionDataOffset, u64 _Offset, u64 _Size);
bool MarkAsScrubbed(const char* filename);
void ReadFromDisc(u64 _Offset, u64 _Length, u32& _Buffer);
void ReadFromDisc(u64 _Offset, u64 _Length, u64& _Buffer);
void ReadFromVolume(u64 _Offset, u64 _Length, u32& _Buffer);
void ReadFromVolume(u64 _Offset, u64 _Length, u64& _Buffer);
bool ParseDisc();
bool ParsePartitionData(SPartition& _rPartition);
u32 GetDOLSize(u64 _DOLOffset);
// Check for simplistic flag stored in an unencrypted pad space (offset 0x80)
u32 IsScrubbed(const char* filename)
{
FILE* f = fopen(filename, "rb");
if (!f)
return false;
u32 ScrubbedFlag = SCRUBBER_VERSION;
fseek(f, 0x80, SEEK_SET);
fread(&ScrubbedFlag, sizeof(ScrubbedFlag), 1, f);
fclose(f);
return ScrubbedFlag;
}
bool Scrub(const char* filename, CompressCB callback, void* arg)
{
bool success = true;
m_Filename = std::string(filename);
u32 version = IsScrubbed(filename);
if (version && version < SCRUBBER_VERSION)
{
if (!PanicYesNo("%s was scrubbed with an older version of DiscScrubber, would you like to re-scrub?", filename))
return success;
}
else if (version)
{
callback("DiscScrubber: This disc is already scrubbed", 0, arg);
NOTICE_LOG(DISCIO, "%s is already scrubbed, skipping...", filename);
return success;
}
m_Disc = CreateVolumeFromFilename(filename);
m_FileSize = m_Disc->GetSize();
u64 numClusters = m_FileSize / CLUSTER_SIZE;
// Warn if not DVD5 or DVD9 size
if (numClusters != 0x23048 && numClusters != 0x46090)
WARN_LOG(DISCIO, "%s is not a standard sized wii m_Disc! (%x blocks)", filename, numClusters);
// Table of free blocks
m_FreeTable = new u8[numClusters];
std::fill(m_FreeTable, m_FreeTable + numClusters, 1);
// Fill the dummy all 1 block
m_Sector1 = new u8[CLUSTER_SIZE];
std::fill(m_Sector1, m_Sector1 + CLUSTER_SIZE, 0xFF);
// Fill out table of free blocks
callback("DiscScrubber: Parsing...", 0, arg);
if (!ParseDisc())
success = false;
// Done with it; need it closed for the next part
delete m_Disc;
m_Disc = NULL;
// Open file
FILE* pFile = fopen(filename, "r+b");
if (!pFile)
{
ERROR_LOG(DISCIO, "DiscScrubber failed to open %s", filename);
success = false;
}
// Let's not touch the file if we've failed up to here :p
if (!success)
goto cleanup;
// Modify file, obeying the table of free blocks
NOTICE_LOG(DISCIO, "Removing garbage data...go get some coffee :)");
for (u64 i = 0; i < numClusters; i++)
{
u64 CurrentOffset = i * CLUSTER_SIZE;
if (m_FreeTable[i])
{
DEBUG_LOG(DISCIO, "Freeing 0x%016llx", CurrentOffset);
// Area is unused so fill with 1s
fseek(pFile, CurrentOffset, SEEK_SET);
success |= fwrite(m_Sector1, CLUSTER_SIZE, 1, pFile) == CLUSTER_SIZE;
if (!success)
{
PanicAlert("DiscScrubber failure");
break;
}
}
else
{
DEBUG_LOG(DISCIO, "Used 0x%016llx", CurrentOffset);
}
// Update progress dialog
if (i % (numClusters / 1000) == 0)
{
char temp[512];
sprintf(temp, "DiscScrubber: %llu/%llu (%s)", i, numClusters, m_FreeTable[i] ? "Free" : "Used");
callback(temp, (float)i / (float)numClusters, arg);
}
}
NOTICE_LOG(DISCIO, "Done removing garbage data");
if (success)
if (!MarkAsScrubbed(filename))
ERROR_LOG(DISCIO, "Really weird - failed to mark scrubbed disk as scrubbed :s");
cleanup:
fclose(pFile);
delete m_Sector1;
delete m_FreeTable;
return success;
}
void MarkAsUsed(u64 _Offset, u64 _Size)
{
u64 CurrentOffset = _Offset;
u64 EndOffset = CurrentOffset + _Size;
DEBUG_LOG(DISCIO, "Marking 0x%016llx - 0x%016llx as used", _Offset, EndOffset);
while ((CurrentOffset < EndOffset) && (CurrentOffset < m_FileSize))
{
m_FreeTable[CurrentOffset / CLUSTER_SIZE] = 0;
CurrentOffset += CLUSTER_SIZE;
}
}
// Compensate for 0x400(SHA-1) per 0x8000(cluster)
void MarkAsUsedE(u64 _PartitionDataOffset, u64 _Offset, u64 _Size)
{
u64 Offset;
u64 Size;
Offset = _Offset / 0x7c00;
Offset = Offset * CLUSTER_SIZE;
Offset += _PartitionDataOffset;
Size = _Size / 0x7c00;
Size = (Size + 1) * CLUSTER_SIZE;
// Add on the offset in the first block for the case where data straddles blocks
Size += _Offset % 0x7c00;
MarkAsUsed(Offset, Size);
}
bool MarkAsScrubbed(const char* filename)
{
FILE* f = fopen(filename, "r+b");
if (!f)
return false;
bool success;
u8 ScrubbedFlag[1] = {SCRUBBER_VERSION};
fseek(f, 0x80, SEEK_SET);
success |= fwrite(ScrubbedFlag, 1, 1, f) == 1;
fclose(f);
return success;
}
// Helper functions for RAW reading the BE discs
void ReadFromDisc(u64 _Offset, u64 _Length, u32& _Buffer)
{
m_Disc->RAWRead(_Offset, _Length, (u8*)&_Buffer);
_Buffer = Common::swap32(_Buffer);
}
void ReadFromDisc(u64 _Offset, u64 _Length, u64& _Buffer)
{
m_Disc->RAWRead(_Offset, _Length, (u8*)&_Buffer);
_Buffer = Common::swap32((u32)_Buffer);
_Buffer <<= 2;
}
// Helper functions for reading the BE volume
void ReadFromVolume(u64 _Offset, u64 _Length, u32& _Buffer)
{
m_Disc->Read(_Offset, _Length, (u8*)&_Buffer);
_Buffer = Common::swap32(_Buffer);
}
void ReadFromVolume(u64 _Offset, u64 _Length, u64& _Buffer)
{
m_Disc->Read(_Offset, _Length, (u8*)&_Buffer);
_Buffer = Common::swap32((u32)_Buffer);
_Buffer <<= 2;
}
bool ParseDisc()
{
// Mark the header as used - it's mostly 0s anyways
MarkAsUsed(0, 0x50000);
for (int x = 0; x < 4; x++)
{
ReadFromDisc(0x40000 + (x * 8) + 0, 4, PartitionGroup[x].numPartitions);
ReadFromDisc(0x40000 + (x * 8) + 4, 4, PartitionGroup[x].PartitionsOffset);
// Read all partitions
for (u32 i = 0; i < PartitionGroup[x].numPartitions; i++)
{
SPartition Partition;
Partition.GroupNumber = x;
Partition.Number = i;
ReadFromDisc(PartitionGroup[x].PartitionsOffset + (i * 8) + 0, 4, Partition.Offset);
ReadFromDisc(PartitionGroup[x].PartitionsOffset + (i * 8) + 4, 4, Partition.Type);
ReadFromDisc(Partition.Offset + 0x2a4, 4, Partition.Header.TMDSize);
ReadFromDisc(Partition.Offset + 0x2a8, 4, Partition.Header.TMDOffset);
ReadFromDisc(Partition.Offset + 0x2ac, 4, Partition.Header.CertChainSize);
ReadFromDisc(Partition.Offset + 0x2b0, 4, Partition.Header.CertChainOffset);
ReadFromDisc(Partition.Offset + 0x2b4, 4, Partition.Header.H3Offset);
ReadFromDisc(Partition.Offset + 0x2b8, 4, Partition.Header.DataOffset);
ReadFromDisc(Partition.Offset + 0x2bc, 4, Partition.Header.DataSize);
PartitionGroup[x].PartitionsVec.push_back(Partition);
}
for (size_t i = 0; i < PartitionGroup[x].PartitionsVec.size(); i++)
{
SPartition& rPartition = PartitionGroup[x].PartitionsVec.at(i);
const SPartitionHeader& rHeader = PartitionGroup[x].PartitionsVec.at(i).Header;
MarkAsUsed(rPartition.Offset, 0x2c0);
MarkAsUsed(rPartition.Offset + rHeader.TMDOffset, rHeader.TMDSize);
MarkAsUsed(rPartition.Offset + rHeader.CertChainOffset, rHeader.CertChainSize);
MarkAsUsed(rPartition.Offset + rHeader.H3Offset, 0x18000);
// This would mark the whole (encrypted) data area
// we need to parse FST and other crap to find what's free within it!
//MarkAsUsed(rPartition.Offset + rHeader.DataOffset, rHeader.DataSize);
// Parse Data! This is where the big gain is
if (!ParsePartitionData(rPartition))
return false;
}
}
return true;
}
// Operations dealing with encrypted space are done here - the volume is swapped to allow this
bool ParsePartitionData(SPartition& _rPartition)
{
bool ParsedOK = true;
// Switch out the main volume temporarily
IVolume *OldVolume = m_Disc;
// Ready some stuff
m_Disc = CreateVolumeFromFilename(m_Filename.c_str(), _rPartition.GroupNumber, _rPartition.Number);
IFileSystem *FileSystem = CreateFileSystem(m_Disc);
if (!FileSystem)
{
ERROR_LOG(DISCIO, "Failed to create filesystem for group %d partition %u", _rPartition.GroupNumber, _rPartition.Number)
ParsedOK = false;
}
else
{
std::vector<const SFileInfo *> Files;
size_t numFiles = FileSystem->GetFileList(Files);
// Mark things as used which are not in the filesystem
// Header, Header Information, Apploader
ReadFromVolume(0x2440 + 0x14, 4, _rPartition.Header.ApploaderSize);
ReadFromVolume(0x2440 + 0x18, 4, _rPartition.Header.ApploaderTrailerSize);
MarkAsUsedE(_rPartition.Offset
+ _rPartition.Header.DataOffset
, 0
, 0x2440
+ _rPartition.Header.ApploaderSize
+ _rPartition.Header.ApploaderTrailerSize);
// DOL
ReadFromVolume(0x420, 4, _rPartition.Header.DOLOffset);
_rPartition.Header.DOLSize = GetDOLSize(_rPartition.Header.DOLOffset);
MarkAsUsedE(_rPartition.Offset
+ _rPartition.Header.DataOffset
, _rPartition.Header.DOLOffset
, _rPartition.Header.DOLSize);
// FST
ReadFromVolume(0x424, 4, _rPartition.Header.FSTOffset);
ReadFromVolume(0x428, 4, _rPartition.Header.FSTSize);
MarkAsUsedE(_rPartition.Offset
+ _rPartition.Header.DataOffset
, _rPartition.Header.FSTOffset
, _rPartition.Header.FSTSize);
// Go through the filesystem and mark entries as used
for (size_t currentFile = 0; currentFile < numFiles; currentFile++)
{
DEBUG_LOG(DISCIO, "%s", (*Files.at(currentFile)).m_FullPath);
// Just 1byte for directory? - it will end up reserving a cluster this way
if ((*Files.at(currentFile)).m_NameOffset & 0x1000000)
MarkAsUsedE(_rPartition.Offset
+ _rPartition.Header.DataOffset
, (*Files.at(currentFile)).m_Offset, 1);
else
MarkAsUsedE(_rPartition.Offset
+ _rPartition.Header.DataOffset
, (*Files.at(currentFile)).m_Offset, (*Files.at(currentFile)).m_FileSize);
}
}
delete FileSystem;
// Swap back
delete m_Disc;
m_Disc = OldVolume;
return ParsedOK;
}
u32 GetDOLSize(u64 _DOLOffset)
{
u32 offset = 0, size = 0, max = 0;
// Iterate through the 7 code segments
for (u8 i = 0; i < 7; i++)
{
ReadFromVolume(_DOLOffset + 0x00 + i * 4, 4, offset);
ReadFromVolume(_DOLOffset + 0x90 + i * 4, 4, size);
if (offset + size > max)
max = offset + size;
}
// Iterate through the 11 data segments
for (u8 i = 0; i < 11; i++)
{
ReadFromVolume(_DOLOffset + 0x1c + i * 4, 4, offset);
ReadFromVolume(_DOLOffset + 0xac + i * 4, 4, size);
if (offset + size > max)
max = offset + size;
}
return max;
}
} // namespace DiscScrubber
} // namespace DiscIO
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