zlibscheme.c

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/*//////////////////////////////// "bwtscheme.c" /////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2005 Intel Corporation. All Rights Reserved.
//
//
//     higher level functions of IPP DC ( data compression ) domain for
//     BWT, MTF, RLE and Huffman encoding/decoding usage
*/

#include "zlibscheme.h"

/* =========================================================================== *
 * This function was taken from ZLIB and tuned up to work in this sample
 * =========================================================================== */
int CompressZLIB( Ipp8u * pSrc, int   srcLen, Ipp8u * pDst, int * dstLen ) {

    z_stream stream;
    int err;

    stream.next_in   = pSrc;
    stream.avail_in  = srcLen;
    stream.next_out  = pDst;
    stream.avail_out = *dstLen;

    if (stream.avail_out != (uInt)(*dstLen)) 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;
    }

    *dstLen = stream.total_out;

    err = deflateEnd(&stream);

    return err;

}

/* =========================================================================== *
 * This function was taken from ZLIB and tuned up to work in this sample
 * =========================================================================== */
int DecompressZLIB( Ipp8u * pSrc, int   srcLen, Ipp8u * pDst, int * dstLen ) {

    z_stream stream;
    int err;

    stream.next_in   = pSrc;
    stream.avail_in  = srcLen;
    stream.next_out  = pDst;
    stream.avail_out = *dstLen;

    if (stream.avail_out != (uInt)(*dstLen)) return Z_BUF_ERROR;

    stream.zalloc    = (alloc_func)0;
    stream.zfree     = (free_func)0;

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

    err = inflate(&stream, Z_FINISH);

    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        if ( err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
            return Z_DATA_ERROR;
        return err;
    }

    *dstLen = stream.total_out;
    err = inflateEnd(&stream);

    return err;
}