1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.  Sun designates this

     7  * particular file as subject to the "Classpath" exception as provided

     8  * by Sun in the LICENSE file that accompanied this code.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    21  * CA 95054 USA or visit www.sun.com if you need additional information or

    22  * have any questions.

    23  */

    24 

    25 /*

    26  * This file is available under and governed by the GNU General Public

    27  * License version 2 only, as published by the Free Software Foundation.

    28  * However, the following notice accompanied the original version of this

    29  * file and, per its terms, should not be removed:

    30  *

    31  * uncompr.c -- decompress a memory buffer

    32  * Copyright (C) 1995-1998 Jean-loup Gailly.

    33  * For conditions of distribution and use, see copyright notice in zlib.h

    34  */

    35 

    36 #include "zlib.h"

    37 

    38 /* ===========================================================================

    39      Decompresses the source buffer into the destination buffer.  sourceLen is

    40    the byte length of the source buffer. Upon entry, destLen is the total

    41    size of the destination buffer, which must be large enough to hold the

    42    entire uncompressed data. (The size of the uncompressed data must have

    43    been saved previously by the compressor and transmitted to the decompressor

    44    by some mechanism outside the scope of this compression library.)

    45    Upon exit, destLen is the actual size of the compressed buffer.

    46      This function can be used to decompress a whole file at once if the

    47    input file is mmap'ed.

    48 

    49      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not

    50    enough memory, Z_BUF_ERROR if there was not enough room in the output

    51    buffer, or Z_DATA_ERROR if the input data was corrupted.

    52 */

    53 int ZEXPORT uncompress (dest, destLen, source, sourceLen)

    54     Bytef *dest;

    55     uLongf *destLen;

    56     const Bytef *source;

    57     uLong sourceLen;

    58 {

    59     z_stream stream;

    60     int err;

    61 

    62     stream.next_in = (Bytef*)source;

    63     stream.avail_in = (uInt)sourceLen;

    64     /* Check for source > 64K on 16-bit machine: */

    65     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

    66 

    67     stream.next_out = dest;

    68     stream.avail_out = (uInt)*destLen;

    69     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    70 

    71     stream.zalloc = (alloc_func)0;

    72     stream.zfree = (free_func)0;

    73 

    74     err = inflateInit(&stream);

    75     if (err != Z_OK) return err;

    76 

    77     err = inflate(&stream, Z_FINISH);

    78     if (err != Z_STREAM_END) {

    79         inflateEnd(&stream);

    80         return err == Z_OK ? Z_BUF_ERROR : err;

    81     }

    82     *destLen = stream.total_out;

    83 

    84     err = inflateEnd(&stream);

    85     return err;

    86 }