null_compression.hh

M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作为模拟平台

/*
 * Copyright (c) 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Erik G. Hallnor
 *          Nathan L. Binkert
 */

#ifndef __BASE_COMPRESSION_NULL_COMPRESSION_HH__
#define __BASE_COMPRESSION_NULL_COMPRESSION_HH__

/**
 * @file
 * This file defines a doNothing compression algorithm.
 */

#include "base/misc.hh" // for fatal()
#include "base/compression/base.hh"


/**
 * A dummy compression class to use when no data compression is desired.
 */
class NullCompression : public CompressionAlgorithm
{
  public:
    int uncompress(uint8_t * dest, uint8_t *src, int size)
    {
        fatal("Can't uncompress data");
        M5_DUMMY_RETURN
    }

    int compress(uint8_t *dest, uint8_t *src, int size)
    {
        fatal("Can't compress data");
        M5_DUMMY_RETURN
    }
};

#endif //__BASE_COMPRESSION_NULL_COMPRESSION_HH__