77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
// Copyright 2013 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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#pragma once
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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 <string>
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#include "Common/CommonTypes.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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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) override;
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friend class DriveReader;
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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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private:
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enum { CACHE_SIZE = 32 };
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int m_blocksize;
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u8* m_cache[CACHE_SIZE];
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u64 m_cache_tags[CACHE_SIZE];
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int m_cache_age[CACHE_SIZE];
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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 std::string& filename);
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typedef bool (*CompressCB)(const std::string& text, float percent, void* arg);
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bool CompressFileToBlob(const std::string& infile, const std::string& outfile, u32 sub_type = 0, int sector_size = 16384,
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CompressCB callback = nullptr, void *arg = nullptr);
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bool DecompressBlobToFile(const std::string& infile, const std::string& outfile,
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CompressCB callback = nullptr, void *arg = nullptr);
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} // namespace
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