/* compress.c -- compress a memory buffer * Copyright (C) 1995-1996 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h  *//* This file was modified since it was taken from the zlib distribution *//* $Id: compress.c,v 1.1 2000/03/31 20:13:08 relyea%netscape.com Exp $ */#include "zlib.h"/* ===========================================================================     Compresses 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 at least 0.1% larger than   sourceLen plus 8 bytes. Upon exit, destLen is the actual size of the   compressed buffer.     This function can be used to compress a whole file at once if the   input file is mmap'ed.     compress 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.*/PR_PUBLIC_API(int) compress (dest, destLen, source, sourceLen)    Bytef *dest;    uLongf *destLen;    const Bytef *source;    uLong sourceLen;{    z_stream stream;    int err;    stream.next_in = (Bytef*)source;    stream.avail_in = (uInt)sourceLen;#ifdef MAXSEG_64K    /* Check for source > 64K on 16-bit machine: */    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;#endif    stream.next_out = dest;    stream.avail_out = (uInt)*destLen;    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;    stream.zalloc = (alloc_func)0;    stream.zfree = (free_func)0;    stream.opaque = (voidpf)0;    err = deflateInit(&stream, Z_DEFAULT_COMPRESSION);    if (err != Z_OK) return err;    err = deflate(&stream, Z_FINISH);    if (err != Z_STREAM_END) {        deflateEnd(&stream);        return err == Z_OK ? Z_BUF_ERROR : err;    }    *destLen = stream.total_out;    err = deflateEnd(&stream);    return err;}