mirror of
https://github.com/libretro/dolphin
synced 2024-11-09 06:53:01 -05:00
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
// Copyright 2008 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 <memory>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "Common/CommonTypes.h"
|
|
#include "Common/File.h"
|
|
#include "DiscIO/Blob.h"
|
|
|
|
namespace DiscIO
|
|
{
|
|
static constexpr u32 GCZ_MAGIC = 0xB10BC001;
|
|
|
|
// GCZ 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 std::unique_ptr<CompressedBlobReader> Create(File::IOFile file,
|
|
const std::string& filename);
|
|
~CompressedBlobReader();
|
|
|
|
const CompressedBlobHeader& GetHeader() const { return m_header; }
|
|
|
|
BlobType GetBlobType() const override { return BlobType::GCZ; }
|
|
|
|
u64 GetRawSize() const override { return m_file_size; }
|
|
u64 GetDataSize() const override { return m_header.data_size; }
|
|
bool IsDataSizeAccurate() const override { return true; }
|
|
|
|
u64 GetBlockSize() const override { return m_header.block_size; }
|
|
bool HasFastRandomAccessInBlock() const override { return false; }
|
|
std::string GetCompressionMethod() const override { return "Deflate"; }
|
|
|
|
u64 GetBlockCompressedSize(u64 block_num) const;
|
|
bool GetBlock(u64 block_num, u8* out_ptr) override;
|
|
|
|
private:
|
|
CompressedBlobReader(File::IOFile file, const std::string& filename);
|
|
|
|
CompressedBlobHeader m_header;
|
|
std::vector<u64> m_block_pointers;
|
|
std::vector<u32> m_hashes;
|
|
int m_data_offset;
|
|
File::IOFile m_file;
|
|
u64 m_file_size;
|
|
std::vector<u8> m_zlib_buffer;
|
|
std::string m_file_name;
|
|
};
|
|
|
|
} // namespace DiscIO
|