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edbbf493f8
Rather than rely on the developer to do the right thing, just make the default behavior safely deallocate resources. If shared semantics are ever needed in the future, the constructor that takes a unique_ptr for shared_ptr can be used.
95 lines
2 KiB
C++
95 lines
2 KiB
C++
// Copyright 2010 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 <cstdio>
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#include <memory>
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#include "Common/CommonTypes.h"
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#include "Common/FileUtil.h"
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#include "DiscIO/CISOBlob.h"
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namespace DiscIO
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{
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static const char CISO_MAGIC[] = "CISO";
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CISOFileReader::CISOFileReader(std::FILE* file)
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: m_file(file)
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{
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m_size = m_file.GetSize();
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CISOHeader header;
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m_file.ReadArray(&header, 1);
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m_block_size = header.block_size;
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MapType count = 0;
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for (u32 idx = 0; idx < CISO_MAP_SIZE; ++idx)
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m_ciso_map[idx] = (1 == header.map[idx]) ? count++ : UNUSED_BLOCK_ID;
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}
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std::unique_ptr<CISOFileReader> CISOFileReader::Create(const std::string& filename)
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{
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if (IsCISOBlob(filename))
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{
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File::IOFile f(filename, "rb");
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return std::unique_ptr<CISOFileReader>(new CISOFileReader(f.ReleaseHandle()));
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}
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return nullptr;
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}
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u64 CISOFileReader::GetDataSize() const
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{
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return CISO_MAP_SIZE * m_block_size;
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}
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u64 CISOFileReader::GetRawSize() const
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{
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return m_size;
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}
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bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
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{
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while (nbytes != 0)
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{
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u64 const block = offset / m_block_size;
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u64 const data_offset = offset % m_block_size;
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u64 const bytes_to_read = std::min(m_block_size - data_offset, nbytes);
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if (block < CISO_MAP_SIZE && UNUSED_BLOCK_ID != m_ciso_map[block])
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{
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// calculate the base address
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u64 const file_off = CISO_HEADER_SIZE + m_ciso_map[block] * (u64)m_block_size + data_offset;
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if (!(m_file.Seek(file_off, SEEK_SET) && m_file.ReadArray(out_ptr, bytes_to_read)))
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{
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m_file.Clear();
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return false;
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}
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}
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else
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{
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std::fill_n(out_ptr, bytes_to_read, 0);
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}
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out_ptr += bytes_to_read;
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offset += bytes_to_read;
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nbytes -= bytes_to_read;
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}
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return true;
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}
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bool IsCISOBlob(const std::string& filename)
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{
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File::IOFile f(filename, "rb");
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CISOHeader header;
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return (f.ReadArray(&header, 1) &&
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std::equal(header.magic, header.magic + sizeof(header.magic), CISO_MAGIC));
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}
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} // namespace
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