75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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/*
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* ungzip.h
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* --------
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* Purpose: Header file for .gz loader
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "openmpt/all/BuildSettings.hpp"
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#include "openmpt/base/Endian.hpp"
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#include "archive.h"
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OPENMPT_NAMESPACE_BEGIN
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#if defined(MPT_WITH_ZLIB) || defined(MPT_WITH_MINIZ)
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class CGzipArchive : public ArchiveBase
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{
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public:
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struct GZheader
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{
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uint8le magic1; // 0x1F
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uint8le magic2; // 0x8B
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uint8le method; // 0-7 = reserved, 8 = deflate
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uint8le flags; // See GZ_F* constants
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uint32le mtime; // UNIX time
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uint8le xflags; // Available for use by specific compression methods. We ignore this.
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uint8le os; // Which OS was used to compress the file? We also ignore this.
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};
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struct GZtrailer
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{
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uint32le crc32_; // CRC32 of decompressed data
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uint32le isize; // Size of decompressed data modulo 2^32
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};
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protected:
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enum MagicBytes
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{
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GZ_HMAGIC1 = 0x1F,
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GZ_HMAGIC2 = 0x8B,
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GZ_HMDEFLATE = 0x08,
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};
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enum HeaderFlags
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{
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GZ_FTEXT = 0x01, // File is probably ASCII text (who cares)
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GZ_FHCRC = 0x02, // CRC16 present
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GZ_FEXTRA = 0x04, // Extra fields present
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GZ_FNAME = 0x08, // Original filename present
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GZ_FCOMMENT = 0x10, // Comment is present
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GZ_FRESERVED = (~(GZ_FTEXT | GZ_FHCRC | GZ_FEXTRA | GZ_FNAME | GZ_FCOMMENT))
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};
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GZheader header;
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public:
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bool ExtractFile(std::size_t index) override;
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CGzipArchive(const FileReader &file);
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~CGzipArchive() override;
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};
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MPT_BINARY_STRUCT(CGzipArchive::GZheader, 10)
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MPT_BINARY_STRUCT(CGzipArchive::GZtrailer, 8)
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#endif // MPT_WITH_ZLIB || MPT_WITH_MINIZ
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OPENMPT_NAMESPACE_END
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