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/***************************************************************************
*
* Copyright (C) 2006 Elad Lahav (elad_lahav@users.sf.net)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
***************************************************************************/
#include "qstring.h"
#include "encoder.h"
#define CHAR_TO_HEX(c) ((c) < 0xA ? '0' + (c) : ('A' - 0xA) + (c))
#define HEX_TO_CHAR(h) ((h) > 'A' ? (h) - ('A' - 0xA) : (h) - '0')
/**
* Class constructor.
*/
Encoder::Encoder() : m_pBuf(NULL), m_nBufLen(0)
{
}
/**
* Class destructor.
*/
Encoder::~Encoder() {
if (m_pBuf)
delete[] m_pBuf;
}
/**
* Encodes a string.
* @param str The string to encode
* @return The hex-encoded ASCII string
*/
const char* Encoder::encode(const QString& str)
{
const char* szStr;
int nLen, i, j;
szStr = str.latin1();
nLen = str.length();
// Ensure the buffer is big enough to contain the result
resize((nLen * 2) + 1);
// Encode the string
for (i = 0, j = 0; i < nLen; i++, j += 2) {
m_pBuf[j] = CHAR_TO_HEX(szStr[i] >> 4);
m_pBuf[j + 1] = CHAR_TO_HEX(szStr[i] & 0x0f);
}
m_pBuf[j] = 0;
return m_pBuf;
}
/**
* Decodes a string.
* @param str The string to decode
* @return The decoded string.
*/
const char* Encoder::decode(const QString& str)
{
const char* szStr;
int nLen, i, j;
szStr = str.latin1();
nLen = str.length();
// Ensure the buffer is big enough to contain the result
nLen /= 2;
resize(nLen + 1);
// Decode the string
for (i = 0, j = 0; i < nLen; i++, j += 2) {
m_pBuf[i] = HEX_TO_CHAR(szStr[j]) << 4;
m_pBuf[i] |= HEX_TO_CHAR(szStr[j + 1]);
}
m_pBuf[i] = 0;
return m_pBuf;
}
/**
* Sets a new size to the buffer.
* @param nNewLen The new size of the buffer
*/
void Encoder::resize(int nNewLen)
{
if (m_nBufLen < nNewLen) {
if (m_pBuf)
delete[] m_pBuf;
m_pBuf = new char[nNewLen];
}
}
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