mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-09-21 11:51:48 +02:00
335cf4f2db
A deep-copy method CopyReader has been added to BlobReader (virtual) and all of its subclasses (override). This should create a second BlobReader to open the same set of data but with an independent read pointer so that it doesn't interfere with any reads done on the original Reader. As part of this, IOFile has added code to create a deep copy IOFile pointer onto the same file, with code based on the platform in question to find the file ID from the file pointer and open a new one. There has also been a small piece added to FileInfo to enable a deep copy, but its only subclass at this time already had a copy constructor so this was relatively minor.
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// Copyright 2008 Dolphin Emulator Project
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
// 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/IOFile.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; }
|
|
std::unique_ptr<BlobReader> CopyReader() const override;
|
|
|
|
u64 GetRawSize() const override { return m_file_size; }
|
|
u64 GetDataSize() const override { return m_header.data_size; }
|
|
DataSizeType GetDataSizeType() const override { return DataSizeType::Accurate; }
|
|
|
|
u64 GetBlockSize() const override { return m_header.block_size; }
|
|
bool HasFastRandomAccessInBlock() const override { return false; }
|
|
std::string GetCompressionMethod() const override { return "Deflate"; }
|
|
std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
|
|
|
|
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
|