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// Copyright 2010 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "DiscIO/CISOBlob.h"
#include <algorithm>
#include <memory>
#include <utility>
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
namespace DiscIO
{
CISOFileReader::CISOFileReader(File::DirectIOFile file) : m_file(std::move(file))
{
m_size = m_file.GetSize();
CISOHeader header;
m_file.OffsetRead(0, Common::AsWritableU8Span(header));
m_block_size = header.block_size;
MapType count = 0;
for (u32 idx = 0; idx < CISO_MAP_SIZE; ++idx)
m_ciso_map[idx] = (1 == header.map[idx]) ? count++ : UNUSED_BLOCK_ID;
}
std::unique_ptr<CISOFileReader> CISOFileReader::Create(File::DirectIOFile file)
{
CISOHeader header;
if (file.OffsetRead(0, Common::AsWritableU8Span(header)) && header.magic == CISO_MAGIC)
{
return std::unique_ptr<CISOFileReader>(new CISOFileReader(std::move(file)));
}
return nullptr;
}
std::unique_ptr<BlobReader> CISOFileReader::CopyReader() const
{
return Create(m_file);
}
u64 CISOFileReader::GetDataSize() const
{
return static_cast<u64>(CISO_MAP_SIZE) * m_block_size;
}
u64 CISOFileReader::GetRawSize() const
{
return m_size;
}
bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
{
if (offset + nbytes > GetDataSize())
return false;
while (nbytes != 0)
{
u64 const block = offset / m_block_size;
u64 const data_offset = offset % m_block_size;
u64 const bytes_to_read = std::min(m_block_size - data_offset, nbytes);
if (block < CISO_MAP_SIZE && UNUSED_BLOCK_ID != m_ciso_map[block])
{
// calculate the base address
u64 const file_off = CISO_HEADER_SIZE + m_ciso_map[block] * (u64)m_block_size + data_offset;
if (!m_file.OffsetRead(file_off, out_ptr, bytes_to_read))
return false;
}
else
{
std::fill_n(out_ptr, bytes_to_read, 0);
}
out_ptr += bytes_to_read;
offset += bytes_to_read;
nbytes -= bytes_to_read;
}
return true;
}
} // namespace DiscIO
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