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// Copyright 2012 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "DiscIO/WbfsBlob.h"
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "Common/Align.h"
#include "Common/Assert.h"
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/Swap.h"
namespace DiscIO
{
static constexpr u64 WII_SECTOR_SIZE = 0x8000;
static constexpr u64 WII_SECTOR_COUNT = 143432 * 2;
static constexpr u64 WII_DISC_HEADER_SIZE = 256;
WbfsFileReader::WbfsFileReader(File::DirectIOFile file, const std::string& path)
: m_size(0), m_good(false)
{
if (!AddFileToList(std::move(file)))
return;
if (!path.empty())
OpenAdditionalFiles(path);
if (!ReadHeader())
return;
m_good = true;
// Grab disc info (assume slot 0, checked in ReadHeader())
m_wlba_table.resize(m_blocks_per_disc);
m_files[0].file.Seek(m_hd_sector_size + WII_DISC_HEADER_SIZE /*+ i * m_disc_info_size*/,
File::SeekOrigin::Begin);
m_files[0].file.Read(Common::AsWritableU8Span(m_wlba_table));
for (size_t i = 0; i < m_blocks_per_disc; i++)
m_wlba_table[i] = Common::swap16(m_wlba_table[i]);
}
WbfsFileReader::~WbfsFileReader() = default;
std::unique_ptr<BlobReader> WbfsFileReader::CopyReader() const
{
auto retval = std::unique_ptr<WbfsFileReader>(new WbfsFileReader(m_files[0].file));
for (size_t ix = 1; ix < m_files.size(); ix++)
retval->AddFileToList(m_files[ix].file);
return retval;
}
u64 WbfsFileReader::GetDataSize() const
{
return WII_SECTOR_COUNT * WII_SECTOR_SIZE;
}
void WbfsFileReader::OpenAdditionalFiles(const std::string& path)
{
if (path.length() < 4)
return;
ASSERT(!m_files.empty()); // The code below gives .wbf0 for index 0, but it should be .wbfs
while (true)
{
// Replace last character with index (e.g. wbfs = wbf1)
if (m_files.size() >= 10)
return;
std::string current_path = path;
current_path.back() = static_cast<char>('0' + m_files.size());
if (!AddFileToList(File::DirectIOFile(current_path, File::AccessMode::Read)))
return;
}
}
bool WbfsFileReader::AddFileToList(File::DirectIOFile file)
{
if (!file.IsOpen())
return false;
const u64 file_size = file.GetSize();
m_files.emplace_back(std::move(file), m_size, file_size);
m_size += file_size;
return true;
}
bool WbfsFileReader::ReadHeader()
{
// Read hd size info
m_files[0].file.Seek(0, File::SeekOrigin::Begin);
m_files[0].file.Read(Common::AsWritableU8Span(m_header));
if (m_header.magic != WBFS_MAGIC)
return false;
m_header.hd_sector_count = Common::swap32(m_header.hd_sector_count);
m_hd_sector_size = 1ull << m_header.hd_sector_shift;
if (m_size != (m_header.hd_sector_count * m_hd_sector_size))
return false;
// Read wbfs cluster info
m_wbfs_sector_size = 1ull << m_header.wbfs_sector_shift;
m_wbfs_sector_count = m_size / m_wbfs_sector_size;
if (m_wbfs_sector_size < WII_SECTOR_SIZE)
return false;
m_blocks_per_disc =
(WII_SECTOR_COUNT * WII_SECTOR_SIZE + m_wbfs_sector_size - 1) / m_wbfs_sector_size;
m_disc_info_size =
Common::AlignUp(WII_DISC_HEADER_SIZE + m_blocks_per_disc * sizeof(u16), m_hd_sector_size);
return m_header.disc_table[0] != 0;
}
bool WbfsFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
{
if (offset + nbytes > GetDataSize())
return false;
while (nbytes)
{
u64 read_size;
auto& data_file = SeekToCluster(offset, &read_size);
if (read_size == 0)
return false;
read_size = std::min(read_size, nbytes);
if (!data_file.Read(out_ptr, read_size))
{
return false;
}
out_ptr += read_size;
nbytes -= read_size;
offset += read_size;
}
return true;
}
File::DirectIOFile& WbfsFileReader::SeekToCluster(u64 offset, u64* available)
{
u64 base_cluster = (offset >> m_header.wbfs_sector_shift);
if (base_cluster < m_blocks_per_disc)
{
u64 cluster_address = m_wbfs_sector_size * m_wlba_table[base_cluster];
u64 cluster_offset = offset & (m_wbfs_sector_size - 1);
u64 final_address = cluster_address + cluster_offset;
for (FileEntry& file_entry : m_files)
{
if (final_address < (file_entry.base_address + file_entry.size))
{
file_entry.file.Seek(final_address - file_entry.base_address, File::SeekOrigin::Begin);
if (available)
{
u64 till_end_of_file = file_entry.size - (final_address - file_entry.base_address);
u64 till_end_of_sector = m_wbfs_sector_size - cluster_offset;
*available = std::min(till_end_of_file, till_end_of_sector);
}
return file_entry.file;
}
}
}
ERROR_LOG_FMT(DISCIO, "Read beyond end of disc");
if (available)
*available = 0;
m_files[0].file.Seek(0, File::SeekOrigin::Begin);
return m_files[0].file;
}
std::unique_ptr<WbfsFileReader> WbfsFileReader::Create(File::DirectIOFile file,
const std::string& path)
{
auto reader = std::unique_ptr<WbfsFileReader>(new WbfsFileReader(std::move(file), path));
if (!reader->IsGood())
reader.reset();
return reader;
}
} // namespace DiscIO
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