/*

 * Copyright (c) 2005 INRIA

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program 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 program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "data-writer.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/poll.h>

#include <fcntl.h>

#include <unistd.h>

#include <cassert>

#include <string.h>

#include <list>

#define noTRACE_DATA_WRITER 1

#ifdef TRACE_DATA_WRITER

#include <iostream>

# define TRACE(x) \

std::cout << "DATA WRITER TRACE " << this << " " << x << std::endl;

#else /* TRACE_DATA_WRITER */

# define TRACE(format,...)

#endif /* TRACE_DATA_WRITER */

#define BUFFER_SIZE (4096)

namespace ns3 {

class DataWriterPrivate {

public:

    DataWriterPrivate ();

    ~DataWriterPrivate ();

    void open (char const *filename);

    void write (uint8_t *buffer, uint32_t size);

private:

    uint8_t m_data[BUFFER_SIZE];

    uint32_t m_current;

    int m_fd;

};

DataWriterPrivate::DataWriterPrivate ()

    : m_current (0)

{}

DataWriterPrivate::~DataWriterPrivate ()

{

    ::Write (m_fd, m_data, m_current);

    ::Close (m_fd);

}

void

DataWriterPrivate::Open (char const *filename)

{

    m_fd = ::Open (filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);

    assert (m_fd != -1);

}

#ifndef min

#define min(a,b) ((a)<(b)?(a):(b))

#endif /* min */

void

DataWriterPrivate::Write (uint8_t *buffer, uint32_t size)

{

    while (size > 0) {

        uint32_t toCopy = min (BUFFER_SIZE - m_current, size);

        memcpy (m_data + m_current, buffer, toCopy);

        size -= toCopy;

        m_current += toCopy;

        buffer += toCopy;

        if (m_current == BUFFER_SIZE) {

            ssize_t written = 0;

            written = ::Write (m_fd, m_data, BUFFER_SIZE);

            assert (written == BUFFER_SIZE);

            m_current = 0;

        }

    }

}

DataWriter::DataWriter ()

    : m_priv (new DataWriterPrivate ())

{}

DataWriter::~DataWriter ()

{

    delete m_priv;

    m_priv = 0;

}

void 

DataWriter::Open (char const *filename)

{

    m_priv->Open (filename);

}

void 

DataWriter::Write (uint8_t *buffer, uint32_t size)

{

    m_priv->Write (buffer, size);

}

}; // namespace