dolphin/Source/Core/DiscIO/CompressedBlob.h

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// Copyright 2008 Dolphin Emulator Project
2015-05-17 23:08:10 +00:00
// 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]
#pragma once
#include <string>
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "DiscIO/Blob.h"
namespace DiscIO
{
bool IsCompressedBlob(const std::string& 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 std::string& filename);
~CompressedBlobReader();
const CompressedBlobHeader &GetHeader() const { return m_header; }
u64 GetDataSize() const override { return m_header.data_size; }
u64 GetRawSize() const override { return m_file_size; }
u64 GetBlockCompressedSize(u64 block_num) const;
void GetBlock(u64 block_num, u8* out_ptr) override;
private:
CompressedBlobReader(const std::string& filename);
CompressedBlobHeader m_header;
u64* m_block_pointers;
u32* m_hashes;
int m_data_offset;
File::IOFile m_file;
u64 m_file_size;
u8* m_zlib_buffer;
int m_zlib_buffer_size;
std::string m_file_name;
};
} // namespace