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deba9ce256
New dolphin-tool command: "header" -b / --block_size -c / --compression -l / --compression_level Informative RVZ/WIA header2 value "compression_level" is now a s32 instead of a u32, because negative compression is a thing. Speaking of, it is now possible to use negative compression levels in dolphin-tool's convert command (not the GUI, though).
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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// WARNING Code not big-endian safe.
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// To create new compressed BLOBs, use CompressFileToBlob.
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// File format
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// * Header
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// * [Block Pointers interleaved with block hashes (hash of decompressed data)]
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// * [Data]
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#pragma once
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#include <memory>
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#include <string>
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#include <vector>
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#include "Common/CommonTypes.h"
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#include "Common/IOFile.h"
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#include "DiscIO/Blob.h"
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namespace DiscIO
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{
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static constexpr u32 GCZ_MAGIC = 0xB10BC001;
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// GCZ file structure:
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// BlobHeader
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// u64 offsetsToBlocks[n], top bit specifies whether the block is compressed, or not.
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// compressed data
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// Blocks that won't compress to less than 97% of the original size are stored as-is.
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struct CompressedBlobHeader // 32 bytes
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{
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u32 magic_cookie; // 0xB10BB10B
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u32 sub_type; // GC image, whatever
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u64 compressed_data_size;
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u64 data_size;
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u32 block_size;
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u32 num_blocks;
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};
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class CompressedBlobReader : public SectorReader
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{
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public:
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static std::unique_ptr<CompressedBlobReader> Create(File::IOFile file,
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const std::string& filename);
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~CompressedBlobReader();
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const CompressedBlobHeader& GetHeader() const { return m_header; }
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BlobType GetBlobType() const override { return BlobType::GCZ; }
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u64 GetRawSize() const override { return m_file_size; }
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u64 GetDataSize() const override { return m_header.data_size; }
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bool IsDataSizeAccurate() const override { return true; }
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u64 GetBlockSize() const override { return m_header.block_size; }
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bool HasFastRandomAccessInBlock() const override { return false; }
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std::string GetCompressionMethod() const override { return "Deflate"; }
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std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
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u64 GetBlockCompressedSize(u64 block_num) const;
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bool GetBlock(u64 block_num, u8* out_ptr) override;
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private:
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CompressedBlobReader(File::IOFile file, const std::string& filename);
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CompressedBlobHeader m_header;
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std::vector<u64> m_block_pointers;
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std::vector<u32> m_hashes;
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int m_data_offset;
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File::IOFile m_file;
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u64 m_file_size;
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std::vector<u8> m_zlib_buffer;
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std::string m_file_name;
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};
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} // namespace DiscIO
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