126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/**
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* @file PacketPassConnector.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 <stddef.h>
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#include <misc/debug.h>
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#include <flow/PacketPassConnector.h>
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static void input_handler_send (PacketPassConnector *o, uint8_t *data, int data_len)
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{
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ASSERT(data_len >= 0)
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ASSERT(data_len <= o->input_mtu)
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ASSERT(o->in_len == -1)
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DebugObject_Access(&o->d_obj);
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// remember input packet
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o->in_len = data_len;
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o->in = data;
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if (o->output) {
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// schedule send
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PacketPassInterface_Sender_Send(o->output, o->in, o->in_len);
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}
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}
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static void output_handler_done (PacketPassConnector *o)
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{
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ASSERT(o->in_len >= 0)
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ASSERT(o->output)
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DebugObject_Access(&o->d_obj);
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// have no input packet
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o->in_len = -1;
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// allow input to send more packets
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PacketPassInterface_Done(&o->input);
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}
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void PacketPassConnector_Init (PacketPassConnector *o, int mtu, BPendingGroup *pg)
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{
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ASSERT(mtu >= 0)
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// init arguments
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o->input_mtu = mtu;
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// init input
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PacketPassInterface_Init(&o->input, o->input_mtu, (PacketPassInterface_handler_send)input_handler_send, o, pg);
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// have no input packet
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o->in_len = -1;
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// have no output
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o->output = NULL;
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DebugObject_Init(&o->d_obj);
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}
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void PacketPassConnector_Free (PacketPassConnector *o)
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{
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DebugObject_Free(&o->d_obj);
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// free input
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PacketPassInterface_Free(&o->input);
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}
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PacketPassInterface * PacketPassConnector_GetInput (PacketPassConnector *o)
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{
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DebugObject_Access(&o->d_obj);
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return &o->input;
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}
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void PacketPassConnector_ConnectOutput (PacketPassConnector *o, PacketPassInterface *output)
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{
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ASSERT(!o->output)
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ASSERT(PacketPassInterface_GetMTU(output) >= o->input_mtu)
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DebugObject_Access(&o->d_obj);
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// set output
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o->output = output;
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// init output
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PacketPassInterface_Sender_Init(o->output, (PacketPassInterface_handler_done)output_handler_done, o);
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// if we have an input packet, schedule send
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if (o->in_len >= 0) {
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PacketPassInterface_Sender_Send(o->output, o->in, o->in_len);
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}
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}
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void PacketPassConnector_DisconnectOutput (PacketPassConnector *o)
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{
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ASSERT(o->output)
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DebugObject_Access(&o->d_obj);
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// set no output
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o->output = NULL;
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}
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