bit-deserializer.cc

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/*
 * Copyright (c) 2020 Universita' di Firenze, Italy
 *
 * 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: Tommaso Pecorella <tommaso.pecorella@unifi.it>
 */
 
#include "bit-deserializer.h"
 
#include "ns3/abort.h"
#include "ns3/log.h"
 
#include <iostream>
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("BitDeserializer");
 
BitDeserializer::BitDeserializer()
{
    NS_LOG_FUNCTION(this);
    m_deserializing = false;
}
 
void
BitDeserializer::PushBytes(std::vector<uint8_t> bytes)
{
    NS_LOG_FUNCTION(this << bytes);
    NS_ABORT_MSG_IF(m_deserializing, "Can't add bytes after deserialization started");
    m_bytesBlob.insert(m_bytesBlob.end(), bytes.begin(), bytes.end());
}
 
void
BitDeserializer::PushBytes(uint8_t* bytes, uint32_t size)
{
    NS_LOG_FUNCTION(this << bytes << size);
    NS_ABORT_MSG_IF(m_deserializing, "Can't add bytes after deserialization started");
    for (uint32_t index = 0; index < size; index++)
    {
        m_bytesBlob.push_back(bytes[index]);
    }
}
 
void
BitDeserializer::PushByte(uint8_t byte)
{
    NS_LOG_FUNCTION(this << +byte);
    NS_ABORT_MSG_IF(m_deserializing, "Can't add bytes after deserialization started");
    m_bytesBlob.push_back(byte);
}
 
uint64_t
BitDeserializer::GetBits(uint8_t size)
{
    NS_LOG_FUNCTION(this << +size);
    uint8_t result = 0;
    PrepareDeserialization();
 
    NS_ABORT_MSG_IF(size > 64, "Number of requested bits exceeds 64");
    NS_ABORT_MSG_IF(size > m_blob.size(), "Number of requested bits exceeds blob size");
 
    for (uint8_t i = 0; i < size; i++)
    {
        result <<= 1;
        result |= m_blob.front();
        m_blob.pop_front();
    }
    return result;
}
 
void
BitDeserializer::PrepareDeserialization()
{
    NS_LOG_FUNCTION(this);
    if (!m_deserializing)
    {
        m_deserializing = true;
        for (auto index = m_bytesBlob.begin(); index != m_bytesBlob.end(); index++)
        {
            m_blob.push_back(*index & 0x80);
            m_blob.push_back(*index & 0x40);
            m_blob.push_back(*index & 0x20);
            m_blob.push_back(*index & 0x10);
            m_blob.push_back(*index & 0x8);
            m_blob.push_back(*index & 0x4);
            m_blob.push_back(*index & 0x2);
            m_blob.push_back(*index & 0x1);
        }
    }
}
 
} // namespace ns3