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/*
* Copyright (c) 2003, 2004 Michael Pyne <michael.pyne@kdemail.net>
*
* This software is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; see the file COPYING.
* If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <qstring.h>
#include <qcstring.h>
#include <qiodevice.h>
#include "bytetape.h"
#include "bint.h"
// A bencoded int is (approximately) as follows:
// i(\d)+e
BInt::BInt (QByteArray &dict, int start)
: m_value (0), m_valid(false)
{
ByteTape tape (dict, start);
init (tape);
}
BInt::BInt (ByteTape &tape)
: m_value(0), m_valid(false)
{
init(tape);
}
void BInt::init (ByteTape &tape)
{
if (*tape != 'i')
return;
tape ++; // Move to start of digits
QByteArray &dict (tape.data());
if (dict.find('e', tape.pos()) == -1)
return;
// Copy the part from the start to the e. The values in-between
// should be digits, perhaps preceded by a negative sign.
int length = dict.find('e', tape.pos()) - tape.pos();
char *ptr = dict.data(); // Get start of buffer
ptr += tape.pos(); // Advance to current position in tape
// Allocate temporary data buffer
QByteArray buffer(length + 1);
qmemmove (buffer.data(), ptr, length);
buffer[length] = 0; // Null-terminate
QString numberString (buffer);
bool a_isValid; // We want to make sure the string is a valid number
m_value = numberString.toLongLong(&a_isValid);
tape += length; // Move to 'e'
tape ++; // Move to next char
m_valid = a_isValid; // Now we're good, if it was a number
}
BInt::~BInt()
{
/* Nothing yet */
}
bool BInt::writeToDevice (QIODevice &device)
{
if (!m_valid)
return false;
/* Write out i234e, and such */
QString str = QString("i%1e").
arg (m_value);
Q_LONG written = 0, result = 0;
written = device.writeBlock (str.latin1(), str.length());
while ((uint) written < str.length())
{
if (written < 0 || result < 0)
return false;
result = device.writeBlock(str.latin1() + written,
str.length() - written);
written += result;
}
return true;
}
// vim: set et ts=4 sw=4:
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