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https://github.com/dolphin-emu/dolphin.git
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335 lines
8.9 KiB
C++
335 lines
8.9 KiB
C++
// Copyright 2009 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 <cstdio>
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#include <memory>
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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 "DiscIO/DiscScrubber.h"
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#include "DiscIO/Filesystem.h"
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#include "DiscIO/Volume.h"
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#include "DiscIO/VolumeCreator.h"
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namespace DiscIO
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{
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namespace DiscScrubber
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{
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#define CLUSTER_SIZE 0x8000
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static u8* m_FreeTable = nullptr;
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static u64 m_FileSize;
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static u64 m_BlockCount;
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static u32 m_BlockSize;
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static int m_BlocksPerCluster;
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static bool m_isScrubbing = false;
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static std::string m_Filename;
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static IVolume* m_Disc = nullptr;
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struct SPartitionHeader
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{
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u8* Ticket[0x2a4];
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u32 TMDSize;
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u64 TMDOffset;
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u32 CertChainSize;
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u64 CertChainOffset;
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// H3Size is always 0x18000
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u64 H3Offset;
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u64 DataOffset;
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u64 DataSize;
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// TMD would be here
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u64 DOLOffset;
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u64 DOLSize;
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u64 FSTOffset;
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u64 FSTSize;
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u32 ApploaderSize;
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u32 ApploaderTrailerSize;
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};
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struct SPartition
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{
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u32 GroupNumber;
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u32 Number;
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u64 Offset;
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u32 Type;
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SPartitionHeader Header;
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};
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struct SPartitionGroup
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{
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u32 numPartitions;
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u64 PartitionsOffset;
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std::vector<SPartition> PartitionsVec;
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};
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static SPartitionGroup PartitionGroup[4];
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void MarkAsUsed(u64 _Offset, u64 _Size);
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void MarkAsUsedE(u64 _PartitionDataOffset, u64 _Offset, u64 _Size);
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void ReadFromVolume(u64 _Offset, u32& _Buffer, bool _Decrypt);
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void ReadFromVolume(u64 _Offset, u64& _Buffer, bool _Decrypt);
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bool ParseDisc();
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bool ParsePartitionData(SPartition& _rPartition);
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bool SetupScrub(const std::string& filename, int block_size)
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{
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bool success = true;
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m_Filename = filename;
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m_BlockSize = block_size;
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if (CLUSTER_SIZE % m_BlockSize != 0)
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{
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ERROR_LOG(DISCIO, "Block size %i is not a factor of 0x8000, scrubbing not possible", m_BlockSize);
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return false;
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}
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m_BlocksPerCluster = CLUSTER_SIZE / m_BlockSize;
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m_Disc = CreateVolumeFromFilename(filename);
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if (!m_Disc)
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return false;
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m_FileSize = m_Disc->GetSize();
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u32 numClusters = (u32)(m_FileSize / CLUSTER_SIZE);
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// Warn if not DVD5 or DVD9 size
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if (numClusters != 0x23048 && numClusters != 0x46090)
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WARN_LOG(DISCIO, "%s is not a standard sized Wii disc! (%x blocks)", filename.c_str(), numClusters);
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// Table of free blocks
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m_FreeTable = new u8[numClusters];
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std::fill(m_FreeTable, m_FreeTable + numClusters, 1);
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// Fill out table of free blocks
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success = ParseDisc();
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// Done with it; need it closed for the next part
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delete m_Disc;
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m_Disc = nullptr;
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m_BlockCount = 0;
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// Let's not touch the file if we've failed up to here :p
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if (!success)
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Cleanup();
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m_isScrubbing = success;
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return success;
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}
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size_t GetNextBlock(File::IOFile& in, u8* buffer)
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{
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u64 CurrentOffset = m_BlockCount * m_BlockSize;
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u64 i = CurrentOffset / CLUSTER_SIZE;
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size_t ReadBytes = 0;
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if (m_isScrubbing && m_FreeTable[i])
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{
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DEBUG_LOG(DISCIO, "Freeing 0x%016" PRIx64, CurrentOffset);
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std::fill(buffer, buffer + m_BlockSize, 0xFF);
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in.Seek(m_BlockSize, SEEK_CUR);
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ReadBytes = m_BlockSize;
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}
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else
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{
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DEBUG_LOG(DISCIO, "Used 0x%016" PRIx64, CurrentOffset);
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in.ReadArray(buffer, m_BlockSize, &ReadBytes);
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}
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m_BlockCount++;
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return ReadBytes;
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}
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void Cleanup()
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{
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if (m_FreeTable) delete[] m_FreeTable;
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m_FreeTable = nullptr;
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m_FileSize = 0;
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m_BlockCount = 0;
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m_BlockSize = 0;
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m_BlocksPerCluster = 0;
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m_isScrubbing = false;
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}
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void MarkAsUsed(u64 _Offset, u64 _Size)
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{
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u64 CurrentOffset = _Offset;
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u64 EndOffset = CurrentOffset + _Size;
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DEBUG_LOG(DISCIO, "Marking 0x%016" PRIx64 " - 0x%016" PRIx64 " as used", _Offset, EndOffset);
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while ((CurrentOffset < EndOffset) && (CurrentOffset < m_FileSize))
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{
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m_FreeTable[CurrentOffset / CLUSTER_SIZE] = 0;
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CurrentOffset += CLUSTER_SIZE;
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}
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}
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// Compensate for 0x400(SHA-1) per 0x8000(cluster)
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void MarkAsUsedE(u64 _PartitionDataOffset, u64 _Offset, u64 _Size)
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{
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u64 Offset;
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u64 Size;
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Offset = _Offset / 0x7c00;
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Offset = Offset * CLUSTER_SIZE;
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Offset += _PartitionDataOffset;
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Size = _Size / 0x7c00;
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Size = (Size + 1) * CLUSTER_SIZE;
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// Add on the offset in the first block for the case where data straddles blocks
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Size += _Offset % 0x7c00;
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MarkAsUsed(Offset, Size);
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}
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// Helper functions for reading the BE volume
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void ReadFromVolume(u64 _Offset, u32& _Buffer, bool _Decrypt)
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{
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m_Disc->Read(_Offset, sizeof(u32), (u8*)&_Buffer, _Decrypt);
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_Buffer = Common::swap32(_Buffer);
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}
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void ReadFromVolume(u64 _Offset, u64& _Buffer, bool _Decrypt)
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{
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m_Disc->Read(_Offset, sizeof(u32), (u8*)&_Buffer, _Decrypt);
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_Buffer = Common::swap32((u32)_Buffer);
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_Buffer <<= 2;
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}
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bool ParseDisc()
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{
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// Mark the header as used - it's mostly 0s anyways
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MarkAsUsed(0, 0x50000);
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for (int x = 0; x < 4; x++)
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{
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ReadFromVolume(0x40000 + (x * 8) + 0, PartitionGroup[x].numPartitions, false);
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ReadFromVolume(0x40000 + (x * 8) + 4, PartitionGroup[x].PartitionsOffset, false);
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// Read all partitions
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for (u32 i = 0; i < PartitionGroup[x].numPartitions; i++)
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{
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SPartition Partition;
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Partition.GroupNumber = x;
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Partition.Number = i;
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ReadFromVolume(PartitionGroup[x].PartitionsOffset + (i * 8) + 0, Partition.Offset, false);
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ReadFromVolume(PartitionGroup[x].PartitionsOffset + (i * 8) + 4, Partition.Type, false);
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ReadFromVolume(Partition.Offset + 0x2a4, Partition.Header.TMDSize, false);
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ReadFromVolume(Partition.Offset + 0x2a8, Partition.Header.TMDOffset, false);
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ReadFromVolume(Partition.Offset + 0x2ac, Partition.Header.CertChainSize, false);
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ReadFromVolume(Partition.Offset + 0x2b0, Partition.Header.CertChainOffset, false);
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ReadFromVolume(Partition.Offset + 0x2b4, Partition.Header.H3Offset, false);
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ReadFromVolume(Partition.Offset + 0x2b8, Partition.Header.DataOffset, false);
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ReadFromVolume(Partition.Offset + 0x2bc, Partition.Header.DataSize, false);
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PartitionGroup[x].PartitionsVec.push_back(Partition);
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}
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for (auto& rPartition : PartitionGroup[x].PartitionsVec)
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{
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const SPartitionHeader& rHeader = rPartition.Header;
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MarkAsUsed(rPartition.Offset, 0x2c0);
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MarkAsUsed(rPartition.Offset + rHeader.TMDOffset, rHeader.TMDSize);
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MarkAsUsed(rPartition.Offset + rHeader.CertChainOffset, rHeader.CertChainSize);
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MarkAsUsed(rPartition.Offset + rHeader.H3Offset, 0x18000);
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// This would mark the whole (encrypted) data area
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// we need to parse FST and other crap to find what's free within it!
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//MarkAsUsed(rPartition.Offset + rHeader.DataOffset, rHeader.DataSize);
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// Parse Data! This is where the big gain is
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if (!ParsePartitionData(rPartition))
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return false;
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}
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}
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return true;
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}
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// Operations dealing with encrypted space are done here - the volume is swapped to allow this
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bool ParsePartitionData(SPartition& _rPartition)
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{
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bool ParsedOK = true;
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// Switch out the main volume temporarily
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IVolume *OldVolume = m_Disc;
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// Ready some stuff
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m_Disc = CreateVolumeFromFilename(m_Filename, _rPartition.GroupNumber, _rPartition.Number);
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if (m_Disc == nullptr)
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{
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ERROR_LOG(DISCIO, "Failed to create volume from file %s", m_Filename.c_str());
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m_Disc = OldVolume;
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return false;
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}
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std::unique_ptr<IFileSystem> filesystem(CreateFileSystem(m_Disc));
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if (!filesystem)
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{
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ERROR_LOG(DISCIO, "Failed to create filesystem for group %d partition %u", _rPartition.GroupNumber, _rPartition.Number);
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ParsedOK = false;
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}
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else
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{
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// Mark things as used which are not in the filesystem
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// Header, Header Information, Apploader
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ReadFromVolume(0x2440 + 0x14, _rPartition.Header.ApploaderSize, true);
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ReadFromVolume(0x2440 + 0x18, _rPartition.Header.ApploaderTrailerSize, true);
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MarkAsUsedE(_rPartition.Offset
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+ _rPartition.Header.DataOffset
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, 0
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, 0x2440
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+ _rPartition.Header.ApploaderSize
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+ _rPartition.Header.ApploaderTrailerSize);
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// DOL
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ReadFromVolume(0x420, _rPartition.Header.DOLOffset, true);
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_rPartition.Header.DOLSize = filesystem->GetBootDOLSize(_rPartition.Header.DOLOffset);
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MarkAsUsedE(_rPartition.Offset
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+ _rPartition.Header.DataOffset
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, _rPartition.Header.DOLOffset
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, _rPartition.Header.DOLSize);
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// FST
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ReadFromVolume(0x424, _rPartition.Header.FSTOffset, true);
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ReadFromVolume(0x428, _rPartition.Header.FSTSize, true);
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MarkAsUsedE(_rPartition.Offset
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+ _rPartition.Header.DataOffset
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, _rPartition.Header.FSTOffset
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, _rPartition.Header.FSTSize);
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// Go through the filesystem and mark entries as used
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for (SFileInfo file : filesystem->GetFileList())
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{
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DEBUG_LOG(DISCIO, "%s", file.m_FullPath.empty() ? "/" : file.m_FullPath.c_str());
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// Just 1byte for directory? - it will end up reserving a cluster this way
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if (file.m_NameOffset & 0x1000000)
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MarkAsUsedE(_rPartition.Offset + _rPartition.Header.DataOffset, file.m_Offset, 1);
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else
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MarkAsUsedE(_rPartition.Offset + _rPartition.Header.DataOffset, file.m_Offset, file.m_FileSize);
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}
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}
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// Swap back
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delete m_Disc;
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m_Disc = OldVolume;
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return ParsedOK;
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}
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} // namespace DiscScrubber
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} // namespace DiscIO
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