/*  * 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" typedef struct ZWrite	ZWrite; struct ZWrite{	ulong	adler;	void	*wr;	int	(*w)(void*, void*, int);}; static intzlwrite(void *vzw, void *buf, int n){	ZWrite *zw; 	zw = vzw;	zw->adler = adler32(zw->adler, buf, n);	n = (*zw->w)(zw->wr, buf, n);	if(n <= 0)		return n;	return n;} intinflatezlib(void *wr, int (*w)(void*, void*, int), void *getr, int (*get)(void*)){	ZWrite zw;	ulong v;	int c, i; 	c = (*get)(getr);	if(c < 0)		return FlateInputFail;	i = (*get)(getr);	if(i < 0)		return FlateInputFail; 	if(((c << 8) | i) % 31)		return FlateCorrupted;	if((c & ZlibMeth) != ZlibDeflate	|| (c & ZlibCInfo) > ZlibWin32k)		return FlateCorrupted; 	zw.wr = wr;	zw.w = w;	zw.adler = 1;	i = inflate(&zw, zlwrite, getr, get);	if(i != FlateOk)		return i; 	v = 0;	for(i = 0; i < 4; i++){		c = (*get)(getr);		if(c < 0)			return FlateInputFail;		v = (v << 8) | c;	}	if(zw.adler != v)		return FlateCorrupted; 	return FlateOk;}