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/*
Copyright (C) 2015 Srivats P.
This file is part of "Ostinato"
This 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 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>
*/
#include "packetbuffer.h"
// PacketBuffer with full control
PacketBuffer::PacketBuffer(int size)
{
if (size == 0)
size = 1600;
buffer_ = new uchar[size];
is_own_buffer_ = true;
head_ = data_ = tail_ = buffer_;
end_ = head_ + size;
}
// PacketBuffer wrapping already existing const buffer
PacketBuffer::PacketBuffer(const uchar *buffer, int size)
{
// FIXME: ugly const_cast hack!!
buffer_ = const_cast<uchar*>(buffer);
is_own_buffer_ = false;
head_ = data_ = buffer_;
tail_ = end_ = buffer_ + size;
}
PacketBuffer::~PacketBuffer()
{
if (is_own_buffer_)
delete[] buffer_;
}
int PacketBuffer::length() const
{
return tail_ - data_;
}
uchar* PacketBuffer::head() const
{
return head_;
}
uchar* PacketBuffer::data() const
{
return data_;
}
uchar* PacketBuffer::tail() const
{
return tail_;
}
uchar* PacketBuffer::end() const
{
return end_;
}
void PacketBuffer::reserve(int len)
{
data_ += len;
tail_ += len;
}
uchar* PacketBuffer::pull(int len)
{
if ((tail_ - data_) < len)
return NULL;
data_ += len;
return data_;
}
uchar* PacketBuffer::push(int len)
{
if ((data_ - head_) < len)
return NULL;
data_ -= len;
return data_;
}
uchar* PacketBuffer::put(int len)
{
uchar *oldTail = tail_;
if ((end_ - tail_) < len)
return NULL;
tail_ += len;
return oldTail;
}
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