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/*
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 * gzip header fields
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 */
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enum
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{
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	GZMAGIC1	= 0x1f,
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	GZMAGIC2	= 0x8b,
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	GZDEFLATE	= 8,
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	GZFTEXT		= 1 << 0,		/* file is text */
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	GZFHCRC		= 1 << 1,		/* crc of header included */
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	GZFEXTRA	= 1 << 2,		/* extra header included */
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	GZFNAME		= 1 << 3,		/* name of file included */
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	GZFCOMMENT	= 1 << 4,		/* header comment included */
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	GZFMASK		= (1 << 5) -1,		/* mask of specified bits */
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	GZXFAST		= 2,			/* used fast algorithm, little compression */
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	GZXBEST		= 4,			/* used maximum compression algorithm */
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	GZOSFAT		= 0,			/* FAT file system */
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	GZOSAMIGA	= 1,			/* Amiga */
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	GZOSVMS		= 2,			/* VMS or OpenVMS */
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	GZOSUNIX	= 3,			/* Unix */
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	GZOSVMCMS	= 4,			/* VM/CMS */
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	GZOSATARI	= 5,			/* Atari TOS */
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	GZOSHPFS	= 6,			/* HPFS file system */
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	GZOSMAC		= 7,			/* Macintosh */
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	GZOSZSYS	= 8,			/* Z-System */
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	GZOSCPM		= 9,			/* CP/M */
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	GZOSTOPS20	= 10,			/* TOPS-20 */
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	GZOSNTFS	= 11,			/* NTFS file system */
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	GZOSQDOS	= 12,			/* QDOS */
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	GZOSACORN	= 13,			/* Acorn RISCOS */
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	GZOSUNK		= 255,
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	GZCRCPOLY	= 0xedb88320UL,
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	GZOSINFERNO	= GZOSUNIX,
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};