jindexedbuffer.h
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifndef J_INDEXEDBUFFER_H
#define J_INDEXEDBUFFER_H
#include "jsemaphore.h"
#include "jcondition.h"
#include "jmutex.h"
#include "jobject.h"
#include <cstring>
#include <stdint.h>
#include <limits.h>
#ifdef _WIN32
#include <windows.h>
#else
#endif
#define MAX_BUFFER_SIZE 1048576
#define MIN_CHUNK_SIZE 1024
#define MAX_CHUNK_SIZE INT_MAX
namespace jthread {
/**
* \brief
*
*/
enum jbuffer_type_t {
BUFFER_BLOCK,
BUFFER_NONBLOCK
};
/**
* \brief Buffer node.
*
*/
struct jringbuffer_t {
uint8_t *data; // buffer
int size, // size of buffer
index; // read index
};
/**
* \brief IndexedBuffer.
*
* @author Jeff Ferr
*/
class IndexedBuffer : public virtual jcommon::Object{
private:
/** \brief */
jringbuffer_t *_buffer;
/** \brief */
int _buffer_size;
/** \brief */
int _chunk_size;
/** \brief */
int _write_index;
/** \brief */
int _pass_index;
/** \brief */
jbuffer_type_t _type;
/** \brief */
Mutex _mutex;
/** \brief */
Condition _semaphore;
public:
/**
* \brief Construtor.
*
*/
IndexedBuffer(int size = 256, int chunk = MIN_CHUNK_SIZE, jbuffer_type_t type = BUFFER_BLOCK);
/**
* \brief Destrutor virtual.
*
*/
virtual ~IndexedBuffer();
/**
* \brief
*
*/
void Reset();
/**
* \brief
*
*/
void Release();
/**
* \brief
*
*/
void SetChunkSize(int size);
/**
* \brief
*
*/
void SetNodesSize(int size);
/**
* \brief
*
*/
int GetChunkSize();
/**
* \brief
*
*/
int GetNodesSize();
/**
* \brief
*
*/
int GetIndex(int *rindex, int *pindex);
/**
* \brief Returns the current size of buffer.
*
* \return -1 caso os indices sejam invalidos, 0 caso esteja vazio, caso contrario
* retorna o tamanho atual do buffer.
*
*/
int GetAvailable(int *rindex, int *pindex);
/**
* \brief Read a chunk.
*
* \param data Data deve conter no minimo o tamanho de chunk. A funcao retorna o tamanho lido em size.
*
*/
int Read(jringbuffer_t *data, int *rindex, int *pindex);
/**
* \brief Read a chunk.
*
* \param data Data deve conter no minimo o tamanho de chunk. A funcao retorna o tamanho lido em size.
*
*/
int Read(uint8_t *data, int size, int *rindex, int *pindex);
/**
* \brief
*
*/
int Write(uint8_t *data, int size);
/**
* \brief
*
*/
int Write(jringbuffer_t *data);
};
}
#endif