113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/**
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* @file BufferWriter.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <misc/debug.h>
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#include <flow/BufferWriter.h>
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static void output_handler_recv (BufferWriter *o, uint8_t *data)
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{
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ASSERT(!o->out_have)
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// set output packet
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o->out_have = 1;
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o->out = data;
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}
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void BufferWriter_Init (BufferWriter *o, int mtu, BPendingGroup *pg)
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{
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ASSERT(mtu >= 0)
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// init output
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PacketRecvInterface_Init(&o->recv_interface, mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
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// set no output packet
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o->out_have = 0;
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DebugObject_Init(&o->d_obj);
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#ifndef NDEBUG
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o->d_mtu = mtu;
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o->d_writing = 0;
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#endif
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}
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void BufferWriter_Free (BufferWriter *o)
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{
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DebugObject_Free(&o->d_obj);
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// free output
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PacketRecvInterface_Free(&o->recv_interface);
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}
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PacketRecvInterface * BufferWriter_GetOutput (BufferWriter *o)
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{
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DebugObject_Access(&o->d_obj);
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return &o->recv_interface;
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}
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int BufferWriter_StartPacket (BufferWriter *o, uint8_t **buf)
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{
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ASSERT(!o->d_writing)
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DebugObject_Access(&o->d_obj);
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if (!o->out_have) {
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return 0;
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}
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if (buf) {
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*buf = o->out;
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}
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#ifndef NDEBUG
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o->d_writing = 1;
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#endif
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return 1;
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}
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void BufferWriter_EndPacket (BufferWriter *o, int len)
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{
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ASSERT(len >= 0)
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ASSERT(len <= o->d_mtu)
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ASSERT(o->out_have)
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ASSERT(o->d_writing)
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DebugObject_Access(&o->d_obj);
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// set no output packet
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o->out_have = 0;
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// finish packet
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PacketRecvInterface_Done(&o->recv_interface, len);
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#ifndef NDEBUG
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o->d_writing = 0;
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#endif
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}
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