100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
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/**
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* @file PacketRecvBlocker.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/PacketRecvBlocker.h>
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static void output_handler_recv (PacketRecvBlocker *o, uint8_t *data)
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{
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ASSERT(!o->out_have)
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DebugObject_Access(&o->d_obj);
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// remember packet
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o->out_have = 1;
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o->out = data;
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o->out_input_blocking = 0;
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}
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static void input_handler_done (PacketRecvBlocker *o, int data_len)
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{
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ASSERT(o->out_have)
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ASSERT(o->out_input_blocking)
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DebugObject_Access(&o->d_obj);
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// schedule done
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o->out_have = 0;
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PacketRecvInterface_Done(&o->output, data_len);
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}
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void PacketRecvBlocker_Init (PacketRecvBlocker *o, PacketRecvInterface *input, BPendingGroup *pg)
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{
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// init arguments
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o->input = input;
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// init output
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PacketRecvInterface_Init(&o->output, PacketRecvInterface_GetMTU(o->input), (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
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// have no output packet
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o->out_have = 0;
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// init input
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PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
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DebugObject_Init(&o->d_obj);
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}
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void PacketRecvBlocker_Free (PacketRecvBlocker *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->output);
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}
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PacketRecvInterface * PacketRecvBlocker_GetOutput (PacketRecvBlocker *o)
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{
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DebugObject_Access(&o->d_obj);
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return &o->output;
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}
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void PacketRecvBlocker_AllowBlockedPacket (PacketRecvBlocker *o)
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{
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DebugObject_Access(&o->d_obj);
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if (!o->out_have || o->out_input_blocking) {
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return;
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}
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// schedule receive
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o->out_input_blocking = 1;
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PacketRecvInterface_Receiver_Recv(o->input, o->out);
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}
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