mirror of https://github.com/Icinga/icinga2.git
149 lines
3.5 KiB
C++
149 lines
3.5 KiB
C++
/******************************************************************************
|
|
* Icinga 2 *
|
|
* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org) *
|
|
* *
|
|
* This program 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 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
|
|
******************************************************************************/
|
|
|
|
#include "base/fifo.hpp"
|
|
|
|
using namespace icinga;
|
|
|
|
/**
|
|
* Constructor for the FIFO class.
|
|
*/
|
|
FIFO::FIFO(void)
|
|
: m_Buffer(NULL), m_DataSize(0), m_AllocSize(0), m_Offset(0)
|
|
{ }
|
|
|
|
/**
|
|
* Destructor for the FIFO class.
|
|
*/
|
|
FIFO::~FIFO(void)
|
|
{
|
|
free(m_Buffer);
|
|
}
|
|
|
|
/**
|
|
* Resizes the FIFO's buffer so that it is at least newSize bytes long.
|
|
*
|
|
* @param newSize The minimum new size of the FIFO buffer.
|
|
*/
|
|
void FIFO::ResizeBuffer(size_t newSize, bool decrease)
|
|
{
|
|
if (m_AllocSize >= newSize && !decrease)
|
|
return;
|
|
|
|
newSize = (newSize / FIFO::BlockSize + 1) * FIFO::BlockSize;
|
|
|
|
if (newSize == m_AllocSize)
|
|
return;
|
|
|
|
char *newBuffer = static_cast<char *>(realloc(m_Buffer, newSize));
|
|
|
|
if (newBuffer == NULL)
|
|
BOOST_THROW_EXCEPTION(std::bad_alloc());
|
|
|
|
m_Buffer = newBuffer;
|
|
|
|
m_AllocSize = newSize;
|
|
}
|
|
|
|
/**
|
|
* Optimizes memory usage of the FIFO buffer by reallocating
|
|
* and moving the buffer.
|
|
*/
|
|
void FIFO::Optimize(void)
|
|
{
|
|
if (m_DataSize < m_Offset) {
|
|
std::memcpy(m_Buffer, m_Buffer + m_Offset, m_DataSize);
|
|
m_Offset = 0;
|
|
|
|
if (m_DataSize > 0)
|
|
ResizeBuffer(m_DataSize, true);
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
size_t FIFO::Peek(void *buffer, size_t count, bool allow_partial)
|
|
{
|
|
ASSERT(allow_partial);
|
|
|
|
if (count > m_DataSize)
|
|
count = m_DataSize;
|
|
|
|
if (buffer != NULL)
|
|
std::memcpy(buffer, m_Buffer + m_Offset, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Implements IOQueue::Read.
|
|
*/
|
|
size_t FIFO::Read(void *buffer, size_t count, bool allow_partial)
|
|
{
|
|
ASSERT(allow_partial);
|
|
|
|
if (count > m_DataSize)
|
|
count = m_DataSize;
|
|
|
|
if (buffer != NULL)
|
|
std::memcpy(buffer, m_Buffer + m_Offset, count);
|
|
|
|
m_DataSize -= count;
|
|
m_Offset += count;
|
|
|
|
Optimize();
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Implements IOQueue::Write.
|
|
*/
|
|
void FIFO::Write(const void *buffer, size_t count)
|
|
{
|
|
ResizeBuffer(m_Offset + m_DataSize + count, false);
|
|
std::memcpy(m_Buffer + m_Offset + m_DataSize, buffer, count);
|
|
m_DataSize += count;
|
|
|
|
SignalDataAvailable();
|
|
}
|
|
|
|
void FIFO::Close(void)
|
|
{ }
|
|
|
|
bool FIFO::IsEof(void) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
size_t FIFO::GetAvailableBytes(void) const
|
|
{
|
|
return m_DataSize;
|
|
}
|
|
|
|
bool FIFO::SupportsWaiting(void) const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool FIFO::IsDataAvailable(void) const
|
|
{
|
|
return m_DataSize > 0;
|
|
}
|