add gzip, bzip2

'

src/cmd/gzip/gzip.h

@@ -0,0 +1,40 @@
+/*
+ * gzip header fields
+ */
+enum
+{
+	GZMAGIC1	= 0x1f,
+	GZMAGIC2	= 0x8b,
+
+	GZDEFLATE	= 8,
+
+	GZFTEXT		= 1 << 0,		/* file is text */
+	GZFHCRC		= 1 << 1,		/* crc of header included */
+	GZFEXTRA	= 1 << 2,		/* extra header included */
+	GZFNAME		= 1 << 3,		/* name of file included */
+	GZFCOMMENT	= 1 << 4,		/* header comment included */
+	GZFMASK		= (1 << 5) -1,		/* mask of specified bits */
+
+	GZXFAST		= 2,			/* used fast algorithm, little compression */
+	GZXBEST		= 4,			/* used maximum compression algorithm */
+
+	GZOSFAT		= 0,			/* FAT file system */
+	GZOSAMIGA	= 1,			/* Amiga */
+	GZOSVMS		= 2,			/* VMS or OpenVMS */
+	GZOSUNIX	= 3,			/* Unix */
+	GZOSVMCMS	= 4,			/* VM/CMS */
+	GZOSATARI	= 5,			/* Atari TOS */
+	GZOSHPFS	= 6,			/* HPFS file system */
+	GZOSMAC		= 7,			/* Macintosh */
+	GZOSZSYS	= 8,			/* Z-System */
+	GZOSCPM		= 9,			/* CP/M */
+	GZOSTOPS20	= 10,			/* TOPS-20 */
+	GZOSNTFS	= 11,			/* NTFS file system */
+	GZOSQDOS	= 12,			/* QDOS */
+	GZOSACORN	= 13,			/* Acorn RISCOS */
+	GZOSUNK		= 255,
+
+	GZCRCPOLY	= 0xedb88320UL,
+
+	GZOSINFERNO	= GZOSUNIX,
+};