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Annotation of embedaddon/sudo/zlib/uncompr.c, revision 1.1

1.1     ! misho       1: /* uncompr.c -- decompress a memory buffer
        !             2:  * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
        !             3:  * For conditions of distribution and use, see copyright notice in zlib.h
        !             4:  */
        !             5: 
        !             6: /* @(#) $Id$ */
        !             7: 
        !             8: #define ZLIB_INTERNAL
        !             9: #include "zlib.h"
        !            10: 
        !            11: /* ===========================================================================
        !            12:      Decompresses the source buffer into the destination buffer.  sourceLen is
        !            13:    the byte length of the source buffer. Upon entry, destLen is the total
        !            14:    size of the destination buffer, which must be large enough to hold the
        !            15:    entire uncompressed data. (The size of the uncompressed data must have
        !            16:    been saved previously by the compressor and transmitted to the decompressor
        !            17:    by some mechanism outside the scope of this compression library.)
        !            18:    Upon exit, destLen is the actual size of the compressed buffer.
        !            19: 
        !            20:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
        !            21:    enough memory, Z_BUF_ERROR if there was not enough room in the output
        !            22:    buffer, or Z_DATA_ERROR if the input data was corrupted.
        !            23: */
        !            24: int ZEXPORT uncompress (dest, destLen, source, sourceLen)
        !            25:     Bytef *dest;
        !            26:     uLongf *destLen;
        !            27:     const Bytef *source;
        !            28:     uLong sourceLen;
        !            29: {
        !            30:     z_stream stream;
        !            31:     int err;
        !            32: 
        !            33:     stream.next_in = (Bytef*)source;
        !            34:     stream.avail_in = (uInt)sourceLen;
        !            35:     /* Check for source > 64K on 16-bit machine: */
        !            36:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
        !            37: 
        !            38:     stream.next_out = dest;
        !            39:     stream.avail_out = (uInt)*destLen;
        !            40:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
        !            41: 
        !            42:     stream.zalloc = (alloc_func)0;
        !            43:     stream.zfree = (free_func)0;
        !            44: 
        !            45:     err = inflateInit(&stream);
        !            46:     if (err != Z_OK) return err;
        !            47: 
        !            48:     err = inflate(&stream, Z_FINISH);
        !            49:     if (err != Z_STREAM_END) {
        !            50:         inflateEnd(&stream);
        !            51:         if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
        !            52:             return Z_DATA_ERROR;
        !            53:         return err;
        !            54:     }
        !            55:     *destLen = stream.total_out;
        !            56: 
        !            57:     err = inflateEnd(&stream);
        !            58:     return err;
        !            59: }