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// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "DiscIO/DiscExtractor.h"
#include <algorithm>
#include <cinttypes>
#include <optional>
#include "Common/CommonTypes.h"
#include "DiscIO/Enums.h"
#include "DiscIO/Filesystem.h"
#include "DiscIO/Volume.h"
namespace DiscIO
{
u64 ReadFile(const Volume& volume, const Partition& partition, const FileInfo* file_info,
u8* buffer, u64 max_buffer_size, u64 offset_in_file)
{
if (!file_info || file_info->IsDirectory() || offset_in_file >= file_info->GetSize())
return 0;
const u64 read_length = std::min(max_buffer_size, file_info->GetSize() - offset_in_file);
DEBUG_LOG(DISCIO, "Reading %" PRIx64 " bytes at %" PRIx64 " from file %s. Offset: %" PRIx64
" Size: %" PRIx32,
read_length, offset_in_file, file_info->GetPath().c_str(), file_info->GetOffset(),
file_info->GetSize());
if (!volume.Read(file_info->GetOffset() + offset_in_file, read_length, buffer, partition))
return 0;
return read_length;
}
bool ExportData(const Volume& volume, const Partition& partition, u64 offset, u64 size,
const std::string& export_filename)
{
File::IOFile f(export_filename, "wb");
if (!f)
return false;
while (size)
{
// Limit read size to 128 MB
const size_t read_size = static_cast<size_t>(std::min<u64>(size, 0x08000000));
std::vector<u8> buffer(read_size);
if (!volume.Read(offset, read_size, buffer.data(), partition))
return false;
if (!f.WriteBytes(buffer.data(), read_size))
return false;
size -= read_size;
offset += read_size;
}
return true;
}
bool ExportFile(const Volume& volume, const Partition& partition, const FileInfo* file_info,
const std::string& export_filename)
{
if (!file_info || file_info->IsDirectory())
return false;
return ExportData(volume, partition, file_info->GetOffset(), file_info->GetSize(),
export_filename);
}
void ExportDirectory(const Volume& volume, const Partition partition, const FileInfo& directory,
bool recursive, const std::string& filesystem_path,
const std::string& export_folder,
const std::function<bool(const std::string& path)>& update_progress)
{
for (const FileInfo& file_info : directory)
{
const std::string path =
filesystem_path + file_info.GetName() + (file_info.IsDirectory() ? "/" : "");
const std::string export_path = export_folder + '/' + path;
if (update_progress(path))
return;
DEBUG_LOG(DISCIO, "%s", export_path.c_str());
if (!file_info.IsDirectory())
{
if (File::Exists(export_path))
NOTICE_LOG(DISCIO, "%s already exists", export_path.c_str());
else if (!ExportFile(volume, partition, &file_info, export_path))
ERROR_LOG(DISCIO, "Could not export %s", export_path.c_str());
}
else if (recursive)
{
File::CreateFullPath(export_path);
ExportDirectory(volume, partition, file_info, recursive, path, export_folder,
update_progress);
}
}
}
bool ExportApploader(const Volume& volume, const Partition& partition,
const std::string& export_filename)
{
if (!IsDisc(volume.GetVolumeType()))
return false;
std::optional<u32> apploader_size = volume.ReadSwapped<u32>(0x2440 + 0x14, partition);
const std::optional<u32> trailer_size = volume.ReadSwapped<u32>(0x2440 + 0x18, partition);
constexpr u32 header_size = 0x20;
if (!apploader_size || !trailer_size)
return false;
*apploader_size += *trailer_size + header_size;
DEBUG_LOG(DISCIO, "Apploader size -> %x", *apploader_size);
return ExportData(volume, partition, 0x2440, *apploader_size, export_filename);
}
std::optional<u64> GetBootDOLOffset(const Volume& volume, const Partition& partition)
{
const Platform volume_type = volume.GetVolumeType();
if (!IsDisc(volume_type))
return {};
const std::optional<u32> offset = volume.ReadSwapped<u32>(0x420, partition);
const u8 offset_shift = volume_type == Platform::WII_DISC ? 2 : 0;
return offset ? static_cast<u64>(*offset) << offset_shift : std::optional<u64>();
}
std::optional<u32> GetBootDOLSize(const Volume& volume, const Partition& partition, u64 dol_offset)
{
if (!IsDisc(volume.GetVolumeType()))
return {};
u32 dol_size = 0;
// Iterate through the 7 code segments
for (u8 i = 0; i < 7; i++)
{
const std::optional<u32> offset = volume.ReadSwapped<u32>(dol_offset + 0x00 + i * 4, partition);
const std::optional<u32> size = volume.ReadSwapped<u32>(dol_offset + 0x90 + i * 4, partition);
if (!offset || !size)
return {};
dol_size = std::max(*offset + *size, dol_size);
}
// Iterate through the 11 data segments
for (u8 i = 0; i < 11; i++)
{
const std::optional<u32> offset = volume.ReadSwapped<u32>(dol_offset + 0x1c + i * 4, partition);
const std::optional<u32> size = volume.ReadSwapped<u32>(dol_offset + 0xac + i * 4, partition);
if (!offset || !size)
return {};
dol_size = std::max(*offset + *size, dol_size);
}
return dol_size;
}
bool ExportDOL(const Volume& volume, const Partition& partition, const std::string& export_filename)
{
if (!IsDisc(volume.GetVolumeType()))
return false;
const std::optional<u64> dol_offset = GetBootDOLOffset(volume, partition);
if (!dol_offset)
return false;
const std::optional<u32> dol_size = GetBootDOLSize(volume, partition, *dol_offset);
if (!dol_size)
return false;
return ExportData(volume, partition, *dol_offset, *dol_size, export_filename);
}
} // namespace DiscIO
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