/**
 * @file StreamBuffer.h
 * @author Ambroz Bizjak <ambrop7@gmail.com>
 * 
 * @section LICENSE
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef BADVPN_STREAMBUFFER_H
#define BADVPN_STREAMBUFFER_H

#include <misc/debug.h>
#include <base/DebugObject.h>
#include <flow/StreamRecvInterface.h>
#include <flow/StreamPassInterface.h>

/**
 * Buffer object which reads data from a \link StreamRecvInterface and writes
 * it to a \link StreamPassInterface.
 */
typedef struct {
    int buf_size;
    StreamRecvInterface *input;
    StreamPassInterface *output;
    uint8_t *buf;
    int buf_start;
    int buf_used;
    DebugObject d_obj;
} StreamBuffer;

/**
 * Initializes the buffer object.
 * 
 * @param o object to initialize
 * @param buf_size size of the buffer. Must be >0.
 * @param input input interface
 * @param outout output interface
 * @return 1 on success, 0 on failure
 */
int StreamBuffer_Init (StreamBuffer *o, int buf_size, StreamRecvInterface *input, StreamPassInterface *output) WARN_UNUSED;

/**
 * Frees the buffer object.
 * 
 * @param o object to free
 */
void StreamBuffer_Free (StreamBuffer *o);

#endif