tor-android/external/badvpn_dns/flow/PacketBuffer.h

78 lines
2.8 KiB
C

/**
* @file PacketBuffer.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.
*
* @section DESCRIPTION
*
* Packet buffer with {@link PacketRecvInterface} input and {@link PacketPassInterface} output.
*/
#ifndef BADVPN_FLOW_PACKETBUFFER_H
#define BADVPN_FLOW_PACKETBUFFER_H
#include <stdint.h>
#include <misc/debug.h>
#include <base/DebugObject.h>
#include <structure/ChunkBuffer2.h>
#include <flow/PacketRecvInterface.h>
#include <flow/PacketPassInterface.h>
/**
* Packet buffer with {@link PacketRecvInterface} input and {@link PacketPassInterface} output.
*/
typedef struct {
DebugObject d_obj;
PacketRecvInterface *input;
int input_mtu;
PacketPassInterface *output;
struct ChunkBuffer2_block *buf_data;
ChunkBuffer2 buf;
} PacketBuffer;
/**
* Initializes the buffer.
* Output MTU must be >= input MTU.
*
* @param buf the object
* @param input input interface
* @param output output interface
* @param num_packets minimum number of packets the buffer must hold. Must be >0.
* @param pg pending group
* @return 1 on success, 0 on failure
*/
int PacketBuffer_Init (PacketBuffer *buf, PacketRecvInterface *input, PacketPassInterface *output, int num_packets, BPendingGroup *pg) WARN_UNUSED;
/**
* Frees the buffer.
*
* @param buf the object
*/
void PacketBuffer_Free (PacketBuffer *buf);
#endif