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73 lines
1.6 KiB
C++
73 lines
1.6 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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// WARNING Code not big-endian safe.
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// To create new compressed BLOBs, use CompressFileToBlob.
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// File format
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// * Header
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// * [Block Pointers interleaved with block hashes (hash of decompressed data)]
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// * [Data]
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#ifndef COMPRESSED_BLOB_H_
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#define COMPRESSED_BLOB_H_
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#include <string>
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#include "Blob.h"
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#include "FileUtil.h"
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namespace DiscIO
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{
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bool IsCompressedBlob(const char* filename);
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const u32 kBlobCookie = 0xB10BC001;
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// A blob file structure:
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// BlobHeader
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// u64 offsetsToBlocks[n], top bit specifies whether the block is compressed, or not.
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// compressed data
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// Blocks that won't compress to less than 97% of the original size are stored as-is.
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struct CompressedBlobHeader // 32 bytes
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{
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u32 magic_cookie; //0xB10BB10B
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u32 sub_type; // gc image, whatever
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u64 compressed_data_size;
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u64 data_size;
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u32 block_size;
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u32 num_blocks;
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};
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class CompressedBlobReader : public SectorReader
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{
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public:
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static CompressedBlobReader* Create(const char *filename);
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~CompressedBlobReader();
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const CompressedBlobHeader &GetHeader() const { return header; }
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u64 GetDataSize() const { return header.data_size; }
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u64 GetRawSize() const { return file_size; }
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u64 GetBlockCompressedSize(u64 block_num) const;
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void GetBlock(u64 block_num, u8 *out_ptr);
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private:
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CompressedBlobReader(const char *filename);
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CompressedBlobHeader header;
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u64 *block_pointers;
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u32 *hashes;
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int data_offset;
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File::IOFile m_file;
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u64 file_size;
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u8 *zlib_buffer;
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int zlib_buffer_size;
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std::string file_name;
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};
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} // namespace
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#endif // COMPRESSED_BLOB_H_
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