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162e3be82b
This is intended to catch WIA files which have been created using wit's default parameters (40 MiB block size), once the WIA PR is merged. The check does however also work for GCZ files – not that I think anyone has a GCZ file with a block size that large.
64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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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/File.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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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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