Logo Search packages:      
Sourcecode: qt4-x11 version File versions

bencodeparser.cpp

/****************************************************************************
**
** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** In addition, as a special exception, Trolltech, as the sole copyright
** holder for Qt Designer, grants users of the Qt/Eclipse Integration
** plug-in the right for the Qt/Eclipse Integration to link to
** functionality provided by Qt Designer and its related libraries.
**
** Trolltech reserves all rights not expressly granted herein.
** 
** Trolltech ASA (c) 2007
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "bencodeparser.h"

#include <QList>
#include <QMetaType>

BencodeParser::BencodeParser()
{
}

bool BencodeParser::parse(const QByteArray &content)
{
    if (content.isEmpty()) {
        errString = QString("No content");
        return false;
    }

    this->content = content;
    index = 0;
    infoStart = 0;
    infoLength = 0;
    return getDictionary(&dictionaryValue);
}

QString BencodeParser::errorString() const
{
    return errString;
}

QMap<QByteArray, QVariant> BencodeParser::dictionary() const
{
    return dictionaryValue;
}

QByteArray BencodeParser::infoSection() const
{
    return content.mid(infoStart, infoLength);
}

bool BencodeParser::getByteString(QByteArray *byteString)
{
    const int contentSize = content.size();
    int size = -1;
    do {
      char c = content.at(index);
      if (c < '0' || c > '9') {
          if (size == -1)
            return false;
          if (c != ':') {
            errString = QString("Unexpected character at pos %1: %2")
                .arg(index).arg(c);
            return false;
          }
          ++index;
          break;
      }
      if (size == -1)
          size = 0;
      size *= 10;
      size += c - '0';
    } while (++index < contentSize);

    if (byteString)
      *byteString = content.mid(index, size);
    index += size;
    return true;
}

bool BencodeParser::getInteger(qint64 *integer)
{
    const int contentSize = content.size();
    if (content.at(index) != 'i')
      return false;

    ++index;
    qint64 num = -1;
    bool negative = false;

    do {
      char c = content.at(index);
      if (c < '0' || c > '9') {
          if (num == -1) {
            if (c != '-' || negative)
                return false;
            negative = true;
            continue;
          } else {
            if (c != 'e') {
                errString = QString("Unexpected character at pos %1: %2")
                  .arg(index).arg(c);
                return false;
            }
            ++index;
            break;
          }
      }
      if (num == -1)
          num = 0;
      num *= 10;
      num += c - '0';
    } while (++index < contentSize);

    if (integer)
      *integer = negative ? -num : num;
    return true;
}

bool BencodeParser::getList(QList<QVariant> *list)
{
    const int contentSize = content.size();
    if (content.at(index) != 'l')
      return false;

    QList<QVariant> tmp;    
    ++index;

    do {
      if (content.at(index) == 'e') {
          ++index;
          break;
      }

      qint64 number;
      QByteArray byteString;
      QList<QVariant> tmpList;
      QMap<QByteArray, QVariant> dictionary;

      if (getInteger(&number))
          tmp << number;
      else if (getByteString(&byteString))
          tmp << byteString;
      else if (getList(&tmpList))
          tmp << tmpList;
      else if (getDictionary(&dictionary))
          tmp << qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary);
      else {
          errString = QString("error at index %1").arg(index);
          return false;
      }
    } while (index < contentSize);

    if (list)
      *list = tmp;
    return true;
}

bool BencodeParser::getDictionary(QMap<QByteArray, QVariant> *dictionary)
{
    const int contentSize = content.size();
    if (content.at(index) != 'd')
      return false;

    QMap<QByteArray, QVariant> tmp;    
    ++index;

    do {
      if (content.at(index) == 'e') {
          ++index;
          break;
      }

      QByteArray key;
      if (!getByteString(&key))
          break;

      if (key == "info")
        infoStart = index;

      qint64 number;
      QByteArray byteString;
      QList<QVariant> tmpList;
      QMap<QByteArray, QVariant> dictionary;

      if (getInteger(&number))
          tmp.insert(key, number);
      else if (getByteString(&byteString))
          tmp.insert(key, byteString);
      else if (getList(&tmpList))
          tmp.insert(key, tmpList);
      else if (getDictionary(&dictionary))
          tmp.insert(key, qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary));
      else {
          errString = QString("error at index %1").arg(index);
          return false;
      }

      if (key == "info")
        infoLength = index - infoStart;

    } while (index < contentSize);

    if (dictionary)
      *dictionary = tmp;
    return true;
}

Generated by  Doxygen 1.6.0   Back to index