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ddcb39d8e3
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4807 8ced0084-cf51-0410-be5f-012b33b47a6e
92 lines
3 KiB
C++
92 lines
3 KiB
C++
// Copyright (C) 2003 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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#ifndef _BLOB_H
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#define _BLOB_H
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// BLOB
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// Blobs in Dolphin are read only Binary Large OBjects. For example, a typical DVD image.
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// Often, you may want to store these things in a highly compressed format, but still
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// allow random access. Or you may store them on an odd device, like raw on a DVD.
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// Always read your BLOBs using an interface returned by CreateBlobReader(). It will
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// detect whether the file is a compressed blob, or just a big hunk of data, or a drive, and
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// automatically do the right thing.
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#include "Common.h"
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namespace DiscIO
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{
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class IBlobReader
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{
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public:
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virtual ~IBlobReader() {}
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virtual u64 GetRawSize() const = 0;
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virtual u64 GetDataSize() const = 0;
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// NOT thread-safe - can't call this from multiple threads.
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virtual bool Read(u64 offset, u64 size, u8* out_ptr) = 0;
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protected:
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IBlobReader() {}
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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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// Currently only uses a single entry cache.
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// Multi-block reads are not cached.
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class SectorReader : public IBlobReader
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{
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private:
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enum { CACHE_SIZE = 32 };
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int m_blocksize;
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u8* cache[CACHE_SIZE];
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u64 cache_tags[CACHE_SIZE];
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int cache_age[CACHE_SIZE];
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protected:
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void SetSectorSize(int blocksize);
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virtual void GetBlock(u64 block_num, u8 *out) = 0;
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// This one is uncached. The default implementation is to simply call GetBlockData multiple times and memcpy.
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virtual bool ReadMultipleAlignedBlocks(u64 block_num, u64 num_blocks, u8 *out_ptr);
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public:
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virtual ~SectorReader();
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// A pointer returned by GetBlockData is invalidated as soon as GetBlockData, Read, or ReadMultipleAlignedBlocks is called again.
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const u8 *GetBlockData(u64 block_num);
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virtual bool Read(u64 offset, u64 size, u8 *out_ptr);
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friend class DriveReader;
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};
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// Factory function - examines the path to choose the right type of IBlobReader, and returns one.
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IBlobReader* CreateBlobReader(const char *filename);
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typedef void (*CompressCB)(const char *text, float percent, void* arg);
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bool CompressFileToBlob(const char *infile, const char *outfile, u32 sub_type = 0, int sector_size = 16384,
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CompressCB callback = 0, void *arg = 0);
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bool DecompressBlobToFile(const char *infile, const char *outfile,
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CompressCB callback = 0, void *arg = 0);
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} // namespace
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#endif
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