uncompr.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation. Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/* uncompr.c -- decompress a memory buffer
 * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* @(#) $Id$ */

#defineZLIB_INTERNAL
#include"zlib.h"

/* ===========================================================================
 Decompresses the source buffer into the destination buffer. *sourceLen is
 the byte length of the source buffer. Upon entry, *destLen is the total size
 of the destination buffer, which must be large enough to hold the entire
 uncompressed data. (The size of the uncompressed data must have been saved
 previously by the compressor and transmitted to the decompressor by some
 mechanism outside the scope of this compression library.) Upon exit,
 *destLen is the size of the decompressed data and *sourceLen is the number
 of source bytes consumed. Upon return, source + *sourceLen points to the
 first unused input byte.

 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
 memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
 Z_DATA_ERROR if the input data was corrupted, including if the input data is
 an incomplete zlib stream.
*/
intZEXPORTuncompress2(Bytef*dest, uLongf*destLen, constBytef*source,
uLong*sourceLen) {
z_streamstream;
interr;
constuIntmax= (uInt)-1;
uLonglen, left;
Bytebuf[1]; /* for detection of incomplete stream when *destLen == 0 */

len=*sourceLen;
if (*destLen) {
left=*destLen;
*destLen=0;
 }
else {
left=1;
dest=buf;
 }

stream.next_in= (z_constBytef*)source;
stream.avail_in=0;
stream.zalloc= (alloc_func)0;
stream.zfree= (free_func)0;
stream.opaque= (voidpf)0;

err=inflateInit(&stream);
if (err!=Z_OK) returnerr;

stream.next_out=dest;
stream.avail_out=0;

do {
if (stream.avail_out==0) {
stream.avail_out=left> (uLong)max ? max : (uInt)left;
left-=stream.avail_out;
 }
if (stream.avail_in==0) {
stream.avail_in=len> (uLong)max ? max : (uInt)len;
len-=stream.avail_in;
 }
err=inflate(&stream, Z_NO_FLUSH);
 } while (err==Z_OK);

*sourceLen-=len+stream.avail_in;
if (dest!=buf)
*destLen=stream.total_out;
elseif (stream.total_out&&err==Z_BUF_ERROR)
left=1;

inflateEnd(&stream);
returnerr==Z_STREAM_END ? Z_OK :
err==Z_NEED_DICT ? Z_DATA_ERROR :
err==Z_BUF_ERROR&&left+stream.avail_out ? Z_DATA_ERROR :
err;
}

intZEXPORTuncompress(Bytef*dest, uLongf*destLen, constBytef*source,
uLongsourceLen) {
returnuncompress2(dest, destLen, source, &sourceLen);
}