/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <flate.h>#include "zlib.h" intdeflatezlibblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug){	ulong adler;	int n; 	if(dsize < 6)		return FlateOutputFail; 	n = deflateblock(dst + 2, dsize - 6, src, ssize, level, debug);	if(n < 0)		return n; 	dst[0] = ZlibDeflate | ZlibWin32k; 	/* bogus zlib encoding of compression level */	dst[1] = ((level > 2) + (level > 5) + (level > 8)) << 6; 	/* header check field */	dst[1] |= 31 - ((dst[0] << 8) | dst[1]) % 31; 	adler = adler32(1, src, ssize);	dst[n + 2] = adler >> 24;	dst[n + 3] = adler >> 16;	dst[n + 4] = adler >> 8;	dst[n + 5] = adler; 	return n + 6;}