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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
// WARNING Code not big-endian safe.
// To create new compressed BLOBs, use CompressFileToBlob.
// File format
// * Header
// * [Block Pointers interleaved with block hashes (hash of decompressed data)]
// * [Data]
#ifndef COMPRESSED_BLOB_H_
#define COMPRESSED_BLOB_H_
#include <string>
#include "Blob.h"
#include "FileUtil.h"
namespace DiscIO
{
bool IsCompressedBlob(const char* filename);
const u32 kBlobCookie = 0xB10BC001;
// A blob file structure:
// BlobHeader
// u64 offsetsToBlocks[n], top bit specifies whether the block is compressed, or not.
// compressed data
// Blocks that won't compress to less than 97% of the original size are stored as-is.
struct CompressedBlobHeader // 32 bytes
{
u32 magic_cookie; //0xB10BB10B
u32 sub_type; // gc image, whatever
u64 compressed_data_size;
u64 data_size;
u32 block_size;
u32 num_blocks;
};
class CompressedBlobReader : public SectorReader
{
public:
static CompressedBlobReader* Create(const char *filename);
~CompressedBlobReader();
const CompressedBlobHeader &GetHeader() const { return header; }
u64 GetDataSize() const { return header.data_size; }
u64 GetRawSize() const { return file_size; }
u64 GetBlockCompressedSize(u64 block_num) const;
void GetBlock(u64 block_num, u8 *out_ptr);
private:
CompressedBlobReader(const char *filename);
CompressedBlobHeader header;
u64 *block_pointers;
u32 *hashes;
int data_offset;
File::IOFile m_file;
u64 file_size;
u8 *zlib_buffer;
int zlib_buffer_size;
std::string file_name;
};
} // namespace
#endif // COMPRESSED_BLOB_H_
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