hxmangle.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

//#include "hlxclib/stdio.h"
#include "hlxclib/string.h"
#include "hxmangle.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

// Given an input buffer, mangle it and return it back
// The caller has to call delete[] on the returned pointer
char*
Cipher(const char* pszBuffer)
{
    char*   pszResult = NULL;
    int	    i = 0;
    int	    nSize = 0;
    
    if (!pszBuffer)
    {
	goto cleanup;
    }

    nSize = strlen(pszBuffer);
    pszResult = new char[nSize * 2 + 1];
    memset(pszResult, 0, nSize * 2 + 1);

    for (i = 0; i < nSize; i++)
    {
	pszResult[i * 2]     = 'c' +  ((pszBuffer[i] & 0x0f) ^ (i & 0x0f) ^ 0x07);
	pszResult[i * 2 + 1] = 'f' + (((pszBuffer[i] & 0xf0) >> 4) ^ (i & 0x0f) ^ 0x03);
    }

cleanup:

    return pszResult;
}

// Given an input buffer, de-mangle it and return it back
// The caller has to call delete[] on the returned pointer
char*
DeCipher(const char* pszBuffer)
{
    char*   pszResult = NULL;
    int	    i = 0; 
    int	    nSize = 0;

    if (!pszBuffer)
    {
	goto cleanup;
    }

    nSize = strlen(pszBuffer);
    pszResult = new char[nSize / 2 + 1];
    memset(pszResult, 0, nSize / 2 + 1);

    for (i = 0; i < nSize / 2; i++)
    {
	pszResult[i] = ((pszBuffer[i * 2] - 'c') ^ (i & 0x0f) ^ 0x07) |
			(((pszBuffer[i * 2 + 1] - 'f') ^ (i & 0x0f) ^ 0x03) << 4);
    }

cleanup:

    return pszResult;
}