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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).
66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <cstdio>
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#include <memory>
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#include <string>
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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 CISO_MAGIC = 0x4F534943; // "CISO" (byteswapped to little endian)
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static const u32 CISO_HEADER_SIZE = 0x8000;
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static const u32 CISO_MAP_SIZE = CISO_HEADER_SIZE - sizeof(u32) - sizeof(char) * 4;
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struct CISOHeader
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{
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// "CISO"
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u32 magic;
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// little endian
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u32 block_size;
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// 0=unused, 1=used, others=invalid
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u8 map[CISO_MAP_SIZE];
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};
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class CISOFileReader : public BlobReader
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{
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public:
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static std::unique_ptr<CISOFileReader> Create(File::IOFile file);
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BlobType GetBlobType() const override { return BlobType::CISO; }
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u64 GetRawSize() const override;
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// The CISO format does not save the original file size.
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// This function returns an upper bound.
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u64 GetDataSize() const override;
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bool IsDataSizeAccurate() const override { return false; }
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u64 GetBlockSize() const override { return m_block_size; }
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bool HasFastRandomAccessInBlock() const override { return true; }
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std::string GetCompressionMethod() const override { return {}; }
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std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
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bool Read(u64 offset, u64 nbytes, u8* out_ptr) override;
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private:
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CISOFileReader(File::IOFile file);
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typedef u16 MapType;
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static const MapType UNUSED_BLOCK_ID = UINT16_MAX;
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File::IOFile m_file;
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u64 m_size;
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u32 m_block_size;
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MapType m_ciso_map[CISO_MAP_SIZE];
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};
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} // namespace DiscIO
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