dolphin/Source/Core/DiscIO/DiscScrubber.cpp
2017-01-04 20:12:49 -05:00

268 lines
8.3 KiB
C++

// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <algorithm>
#include <cinttypes>
#include <cstddef>
#include <cstdio>
#include <memory>
#include <string>
#include <vector>
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/Logging/Log.h"
#include "DiscIO/DiscScrubber.h"
#include "DiscIO/Filesystem.h"
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeCreator.h"
namespace DiscIO
{
constexpr size_t CLUSTER_SIZE = 0x8000;
DiscScrubber::DiscScrubber() = default;
DiscScrubber::~DiscScrubber() = default;
bool DiscScrubber::SetupScrub(const std::string& filename, int block_size)
{
m_filename = filename;
m_block_size = block_size;
if (CLUSTER_SIZE % m_block_size != 0)
{
ERROR_LOG(DISCIO, "Block size %u is not a factor of 0x8000, scrubbing not possible",
m_block_size);
return false;
}
m_disc = CreateVolumeFromFilename(filename);
if (!m_disc)
return false;
m_file_size = m_disc->GetSize();
const size_t num_clusters = static_cast<size_t>(m_file_size / CLUSTER_SIZE);
// Warn if not DVD5 or DVD9 size
if (num_clusters != 0x23048 && num_clusters != 0x46090)
{
WARN_LOG(DISCIO, "%s is not a standard sized Wii disc! (%zx blocks)", filename.c_str(),
num_clusters);
}
// Table of free blocks
m_free_table.resize(num_clusters, 1);
// Fill out table of free blocks
const bool success = ParseDisc();
// Done with it; need it closed for the next part
m_disc.reset();
m_block_count = 0;
m_is_scrubbing = success;
return success;
}
size_t DiscScrubber::GetNextBlock(File::IOFile& in, u8* buffer)
{
const u64 current_offset = m_block_count * m_block_size;
const u64 i = current_offset / CLUSTER_SIZE;
size_t read_bytes = 0;
if (m_is_scrubbing && m_free_table[i])
{
DEBUG_LOG(DISCIO, "Freeing 0x%016" PRIx64, current_offset);
std::fill(buffer, buffer + m_block_size, 0x00);
in.Seek(m_block_size, SEEK_CUR);
read_bytes = m_block_size;
}
else
{
DEBUG_LOG(DISCIO, "Used 0x%016" PRIx64, current_offset);
in.ReadArray(buffer, m_block_size, &read_bytes);
}
m_block_count++;
return read_bytes;
}
void DiscScrubber::MarkAsUsed(u64 offset, u64 size)
{
u64 current_offset = offset;
const u64 end_offset = current_offset + size;
DEBUG_LOG(DISCIO, "Marking 0x%016" PRIx64 " - 0x%016" PRIx64 " as used", offset, end_offset);
while (current_offset < end_offset && current_offset < m_file_size)
{
m_free_table[current_offset / CLUSTER_SIZE] = 0;
current_offset += CLUSTER_SIZE;
}
}
// Compensate for 0x400 (SHA-1) per 0x8000 (cluster), and round to whole clusters
void DiscScrubber::MarkAsUsedE(u64 partition_data_offset, u64 offset, u64 size)
{
u64 first_cluster_start = offset / 0x7c00 * CLUSTER_SIZE + partition_data_offset;
u64 last_cluster_end;
if (size == 0)
{
// Without this special case, a size of 0 can be rounded to 1 cluster instead of 0
last_cluster_end = first_cluster_start;
}
else
{
last_cluster_end = ((offset + size - 1) / 0x7c00 + 1) * CLUSTER_SIZE + partition_data_offset;
}
MarkAsUsed(first_cluster_start, last_cluster_end - first_cluster_start);
}
// Helper functions for reading the BE volume
bool DiscScrubber::ReadFromVolume(u64 offset, u32& buffer, bool decrypt)
{
return m_disc->ReadSwapped(offset, &buffer, decrypt);
}
bool DiscScrubber::ReadFromVolume(u64 offset, u64& buffer, bool decrypt)
{
u32 temp_buffer;
if (!m_disc->ReadSwapped(offset, &temp_buffer, decrypt))
return false;
buffer = static_cast<u64>(temp_buffer) << 2;
return true;
}
bool DiscScrubber::ParseDisc()
{
// Mark the header as used - it's mostly 0s anyways
MarkAsUsed(0, 0x50000);
for (u32 x = 0; x < 4; x++)
{
if (!ReadFromVolume(0x40000 + (x * 8) + 0, m_partition_group[x].num_partitions, false) ||
!ReadFromVolume(0x40000 + (x * 8) + 4, m_partition_group[x].partitions_offset, false))
{
return false;
}
// Read all partitions
for (u32 i = 0; i < m_partition_group[x].num_partitions; i++)
{
Partition partition;
partition.group_number = x;
partition.number = i;
if (!ReadFromVolume(m_partition_group[x].partitions_offset + (i * 8) + 0, partition.offset,
false) ||
!ReadFromVolume(m_partition_group[x].partitions_offset + (i * 8) + 4, partition.type,
false) ||
!ReadFromVolume(partition.offset + 0x2a4, partition.header.tmd_size, false) ||
!ReadFromVolume(partition.offset + 0x2a8, partition.header.tmd_offset, false) ||
!ReadFromVolume(partition.offset + 0x2ac, partition.header.cert_chain_size, false) ||
!ReadFromVolume(partition.offset + 0x2b0, partition.header.cert_chain_offset, false) ||
!ReadFromVolume(partition.offset + 0x2b4, partition.header.h3_offset, false) ||
!ReadFromVolume(partition.offset + 0x2b8, partition.header.data_offset, false) ||
!ReadFromVolume(partition.offset + 0x2bc, partition.header.data_size, false))
{
return false;
}
m_partition_group[x].partitions.push_back(partition);
}
for (auto& partition : m_partition_group[x].partitions)
{
const PartitionHeader& header = partition.header;
MarkAsUsed(partition.offset, 0x2c0);
MarkAsUsed(partition.offset + header.tmd_offset, header.tmd_size);
MarkAsUsed(partition.offset + header.cert_chain_offset, header.cert_chain_size);
MarkAsUsed(partition.offset + header.h3_offset, 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(partition.offset + header.data_offset, header.data_size);
// Parse Data! This is where the big gain is
if (!ParsePartitionData(partition))
return false;
}
}
return true;
}
// Operations dealing with encrypted space are done here - the volume is swapped to allow this
bool DiscScrubber::ParsePartitionData(Partition& partition)
{
bool parsed_ok = true;
// Switch out the main volume temporarily
std::unique_ptr<IVolume> old_volume;
m_disc.swap(old_volume);
// Ready some stuff
m_disc = CreateVolumeFromFilename(m_filename, partition.group_number, partition.number);
if (m_disc == nullptr)
{
ERROR_LOG(DISCIO, "Failed to create volume from file %s", m_filename.c_str());
m_disc.swap(old_volume);
return false;
}
std::unique_ptr<IFileSystem> filesystem(CreateFileSystem(m_disc.get()));
if (!filesystem)
{
ERROR_LOG(DISCIO, "Failed to create filesystem for group %u partition %u",
partition.group_number, partition.number);
parsed_ok = false;
}
else
{
// Mark things as used which are not in the filesystem
// Header, Header Information, Apploader
parsed_ok = parsed_ok && ReadFromVolume(0x2440 + 0x14, partition.header.apploader_size, true);
parsed_ok =
parsed_ok && ReadFromVolume(0x2440 + 0x18, partition.header.apploader_trailer_size, true);
MarkAsUsedE(partition.offset + partition.header.data_offset, 0,
0x2440 + partition.header.apploader_size + partition.header.apploader_trailer_size);
// DOL
partition.header.dol_offset = filesystem->GetBootDOLOffset();
partition.header.dol_size = filesystem->GetBootDOLSize(partition.header.dol_offset);
parsed_ok = parsed_ok && partition.header.dol_offset && partition.header.dol_size;
MarkAsUsedE(partition.offset + partition.header.data_offset, partition.header.dol_offset,
partition.header.dol_size);
// FST
parsed_ok = parsed_ok && ReadFromVolume(0x424, partition.header.fst_offset, true);
parsed_ok = parsed_ok && ReadFromVolume(0x428, partition.header.fst_size, true);
MarkAsUsedE(partition.offset + partition.header.data_offset, partition.header.fst_offset,
partition.header.fst_size);
// Go through the filesystem and mark entries as used
for (const SFileInfo& file : filesystem->GetFileList())
{
DEBUG_LOG(DISCIO, "%s", file.m_FullPath.empty() ? "/" : file.m_FullPath.c_str());
if ((file.m_NameOffset & 0x1000000) == 0)
{
MarkAsUsedE(partition.offset + partition.header.data_offset, file.m_Offset,
file.m_FileSize);
}
}
}
// Swap back
m_disc.swap(old_volume);
return parsed_ok;
}
} // namespace DiscIO