forked from dolphin-emu/dolphin
130 lines
3.1 KiB
C++
130 lines
3.1 KiB
C++
// Copyright 2008 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 <cstddef>
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#include <cstring>
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#include <limits>
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#include <memory>
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#include <string>
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#include "Common/CDUtils.h"
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#include "Common/CommonTypes.h"
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#include "Common/FileUtil.h"
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#include "DiscIO/Blob.h"
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#include "DiscIO/CISOBlob.h"
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#include "DiscIO/CompressedBlob.h"
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#include "DiscIO/DriveBlob.h"
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#include "DiscIO/FileBlob.h"
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#include "DiscIO/WbfsBlob.h"
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namespace DiscIO
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{
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// Provides caching and split-operation-to-block-operations facilities.
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// Used for compressed blob reading and direct drive reading.
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void SectorReader::SetSectorSize(int blocksize)
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{
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for (auto& cache_entry : m_cache)
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cache_entry.resize(blocksize);
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m_cache_tags.fill(std::numeric_limits<u64>::max());
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m_blocksize = blocksize;
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}
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SectorReader::~SectorReader()
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{
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}
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const std::vector<u8>& SectorReader::GetBlockData(u64 block_num)
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{
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// TODO : Expand usage of the cache to more than one block :P
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if (m_cache_tags[0] == block_num)
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return m_cache[0];
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GetBlock(block_num, m_cache[0].data());
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m_cache_tags[0] = block_num;
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return m_cache[0];
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}
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bool SectorReader::Read(u64 offset, u64 size, u8* out_ptr)
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{
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u64 startingBlock = offset / m_blocksize;
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u64 remain = size;
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int positionInBlock = (int)(offset % m_blocksize);
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u64 block = startingBlock;
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while (remain > 0)
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{
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// Check if we are ready to do a large block read. > instead of >= so we don't bother if remain is only one block.
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if (positionInBlock == 0 && remain > (u64)m_blocksize)
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{
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u64 num_blocks = remain / m_blocksize;
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ReadMultipleAlignedBlocks(block, num_blocks, out_ptr);
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block += num_blocks;
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out_ptr += num_blocks * m_blocksize;
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remain -= num_blocks * m_blocksize;
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continue;
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}
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const std::vector<u8>& data = GetBlockData(block);
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u32 to_copy = m_blocksize - positionInBlock;
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if (to_copy >= remain)
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{
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// Yay, we are done!
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std::copy(data.begin() + positionInBlock, data.begin() + positionInBlock + remain, out_ptr);
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return true;
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}
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else
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{
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std::copy(data.begin() + positionInBlock, data.begin() + positionInBlock + to_copy, out_ptr);
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out_ptr += to_copy;
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remain -= to_copy;
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positionInBlock = 0;
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block++;
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}
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}
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return true;
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}
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bool SectorReader::ReadMultipleAlignedBlocks(u64 block_num, u64 num_blocks, u8* out_ptr)
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{
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for (u64 i = 0; i < num_blocks; i++)
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{
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const std::vector<u8>& data = GetBlockData(block_num + i);
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const u64 offset = i * m_blocksize;
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std::copy(data.begin(), data.end(), out_ptr + offset);
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}
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return true;
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}
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std::unique_ptr<IBlobReader> CreateBlobReader(const std::string& filename)
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{
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if (cdio_is_cdrom(filename))
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return DriveReader::Create(filename);
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if (!File::Exists(filename))
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return nullptr;
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if (IsWbfsBlob(filename))
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return WbfsFileReader::Create(filename);
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if (IsGCZBlob(filename))
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return CompressedBlobReader::Create(filename);
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if (IsCISOBlob(filename))
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return CISOFileReader::Create(filename);
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// Still here? Assume plain file - since we know it exists due to the File::Exists check above.
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return PlainFileReader::Create(filename);
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}
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} // namespace
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