forked from dolphin-emu/dolphin
a82675b7d5
Also changes some function params, but this is ok. Some simplifications were also able to be made (ie. killing off strcmps with ==, etc).
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
// 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]
|
|
|
|
#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 header; }
|
|
u64 GetDataSize() const override { return header.data_size; }
|
|
u64 GetRawSize() const override { return file_size; }
|
|
u64 GetBlockCompressedSize(u64 block_num) const;
|
|
void GetBlock(u64 block_num, u8* out_ptr) override;
|
|
private:
|
|
CompressedBlobReader(const std::string& 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
|