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https://github.com/dolphin-emu/dolphin.git
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f0431631a8
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2590 8ced0084-cf51-0410-be5f-012b33b47a6e
138 lines
3.3 KiB
C++
138 lines
3.3 KiB
C++
// Copyright (C) 2003-2008 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "Common.h"
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#include "FileUtil.h"
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#include "CDUtils.h"
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#include "Blob.h"
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#include "CompressedBlob.h"
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#include "FileBlob.h"
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#include "DriveBlob.h"
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#include "MappedFile.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 (int i = 0; i < CACHE_SIZE; i++)
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{
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cache[i] = new u8[blocksize];
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cache_tags[i] = (u64)(s64) - 1;
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}
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m_blocksize = blocksize;
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}
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SectorReader::~SectorReader() {
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for (int i = 0; i < CACHE_SIZE; i++)
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delete [] cache[i];
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}
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const 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 (cache_tags[0] == block_num)
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{
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return cache[0];
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}
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else
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{
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GetBlock(block_num, cache[0]);
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cache_tags[0] = block_num;
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return cache[0];
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}
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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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u32 toCopy = m_blocksize - positionInBlock;
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if (toCopy >= remain)
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{
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const u8* data = GetBlockData(block);
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if (!data)
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return false;
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// Yay, we are done!
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memcpy(out_ptr, data + positionInBlock, (size_t)remain);
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return true;
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}
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else
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{
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const u8* data = GetBlockData(block);
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if (!data)
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return false;
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memcpy(out_ptr, data + positionInBlock, toCopy);
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out_ptr += toCopy;
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remain -= toCopy;
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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 u8 *data = GetBlockData(block_num + i);
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if (!data)
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return false;
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memcpy(out_ptr + i * m_blocksize, data, m_blocksize);
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}
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return true;
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}
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IBlobReader* CreateBlobReader(const char* 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 0;
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if (IsCompressedBlob(filename))
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return CompressedBlobReader::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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