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xordecoder.cpp

/***************************************************************************
 * Copyright (c) 2003 Volker Christian <voc@users.sourceforge.net>         *
 *                                                                         *
 * Permission is hereby granted, free of charge, to any person obtaining a *
 * copy of this software and associated documentation files (the           *
 * "Software"), to deal in the Software without restriction, including     *
 * without limitation the rights to use, copy, modify, merge, publish,     *
 * distribute, sublicense, and/or sell copies of the Software, and to      *
 * permit persons to whom the Software is furnished to do so, subject to   *
 * the following conditions:                                               *
 *                                                                         *
 * The above copyright notice and this permission notice shall be included *
 * in all copies or substantial portions of the Software.                  *
 *                                                                         *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF              *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  *
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY    *
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,    *
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE       *
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                  *
 ***************************************************************************/
#include "xordecoder.h"
#include <stddef.h>
#include <string.h>


XorDecoder::XorDecoder()
 : Decoder()
{
    oldData = NULL;
}


XorDecoder::XorDecoder(Decoder *chain)
 : Decoder(chain)
{
    oldData = NULL;
}


bool XorDecoder::decode(unsigned char* rawData, size_t rawSize,
        unsigned char* encData, size_t encSize)
{
    if (oldData == NULL) {
        oldData = new unsigned char[encSize];
        memset(oldData, 0, encSize);
    }

    if (oldData != NULL) {
        for (size_t i = 0; i < encSize; i++) {
            oldData[i] = rawData[i] = encData[i] ^ oldData[i];
        }
    }

    return encSize == rawSize;
}


XorDecoder::~XorDecoder()
{
    if (oldData != NULL) {
        delete[] oldData;
    }
}

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