icinga2/lib/base/stdiostream.cpp

100 lines
3.2 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 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 "i2-base.h"
using namespace icinga;
/**
* Constructor for the StdioStream class.
*
* @param innerStream The inner stream.
* @param ownsStream Whether the new object owns the inner stream. If true
* the stream's destructor deletes the inner stream.
*/
StdioStream::StdioStream(iostream *innerStream, bool ownsStream)
: m_InnerStream(innerStream), m_OwnsStream(ownsStream),
m_ReadAheadBuffer(boost::make_shared<FIFO>())
{
m_ReadAheadBuffer->Start();
}
/**
* Destructor for the StdioStream class.
*/
StdioStream::~StdioStream(void)
{
m_ReadAheadBuffer->Close();
}
void StdioStream::Start(void)
{
SetConnected(true);
Stream::Start();
}
size_t StdioStream::GetAvailableBytes(void) const
{
if (m_InnerStream->eof() && m_ReadAheadBuffer->GetAvailableBytes() == 0)
return 0;
else
return 1024; /* doesn't have to be accurate */
}
size_t StdioStream::Read(void *buffer, size_t size)
{
size_t peek_len, read_len;
peek_len = m_ReadAheadBuffer->GetAvailableBytes();
peek_len = m_ReadAheadBuffer->Read(buffer, peek_len);
m_InnerStream->read(static_cast<char *>(buffer) + peek_len, size - peek_len);
read_len = m_InnerStream->gcount();
return peek_len + read_len;
}
size_t StdioStream::Peek(void *buffer, size_t size)
{
size_t peek_len, read_len;
peek_len = m_ReadAheadBuffer->GetAvailableBytes();
peek_len = m_ReadAheadBuffer->Peek(buffer, peek_len);
m_InnerStream->read(static_cast<char *>(buffer) + peek_len, size - peek_len);
read_len = m_InnerStream->gcount();
m_ReadAheadBuffer->Write(static_cast<char *>(buffer) + peek_len, read_len);
return peek_len + read_len;
}
void StdioStream::Write(const void *buffer, size_t size)
{
m_InnerStream->write(static_cast<const char *>(buffer), size);
}
void StdioStream::Close(void)
{
if (m_OwnsStream)
delete m_InnerStream;
Stream::Close();
}