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include
ola
io
IOStack.h
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/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* IOStack.h
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* A non-contigous memory buffer that operates as a stack (LIFO).
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* Copyright (C) 2013 Simon Newton
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*/
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#ifndef INCLUDE_OLA_IO_IOSTACK_H_
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#define INCLUDE_OLA_IO_IOSTACK_H_
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#include <ola/io/IOVecInterface.h>
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#include <ola/io/InputBuffer.h>
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#include <ola/io/OutputBuffer.h>
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#include <stdint.h>
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#include <sys/uio.h>
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#include <deque>
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#include <iostream>
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#include <queue>
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#include <string>
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namespace
ola {
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namespace
io {
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class
IOStack
:
public
IOVecInterface
,
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public
InputBufferInterface
,
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public
OutputBufferInterface
{
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public
:
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IOStack
();
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explicit
IOStack
(
class
MemoryBlockPool
*block_pool);
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~IOStack
();
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unsigned
int
Size
()
const
;
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bool
Empty()
const
{
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// guard against the case of Empty blocks.
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return
m_blocks.empty() ||
Size
() == 0;
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}
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// From OutputBufferInterface
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void
Write
(
const
uint8_t *data,
unsigned
int
length);
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// From InputBufferInterface, these reads consume data from the buffer.
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unsigned
int
Read
(uint8_t *data,
unsigned
int
length);
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unsigned
int
Read
(std::string *output,
unsigned
int
length);
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// From IOVecInterface
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const
struct
iovec *
AsIOVec
(
int
*io_count)
const
;
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void
Pop
(
unsigned
int
n);
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// 0-copy append to an IOQueue
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void
MoveToIOQueue
(
class
IOQueue
*queue);
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// purge the underlying memory pool
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void
Purge();
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void
Dump
(std::ostream *output);
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private
:
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typedef
std::deque<class MemoryBlock*> BlockVector;
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class
MemoryBlockPool
* m_pool;
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bool
m_delete_pool;
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BlockVector m_blocks;
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void
PrependBlock();
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// no copying / assignment for now
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IOStack
(
const
IOStack
&);
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IOStack
& operator=(
const
IOStack
&);
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};
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}
// namespace io
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}
// namespace ola
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#endif // INCLUDE_OLA_IO_IOSTACK_H_
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