141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/**
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* @file LineBuffer.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 <stdlib.h>
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#include <string.h>
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#include <base/BLog.h>
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#include <flow/LineBuffer.h>
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#include <generated/blog_channel_LineBuffer.h>
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static void input_handler_done (LineBuffer *o, int data_len)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(data_len > 0)
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ASSERT(data_len <= o->buf_size - o->buf_used)
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// update buffer
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o->buf_used += data_len;
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// look for newline
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int i;
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for (i = o->buf_used - data_len; i < o->buf_used; i++) {
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if (o->buf[i] == o->nl_char) {
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break;
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}
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}
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if (i < o->buf_used || o->buf_used == o->buf_size) {
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if (i == o->buf_used) {
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BLog(BLOG_WARNING, "line too long");
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}
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// pass to output
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o->buf_consumed = (i < o->buf_used ? i + 1 : i);
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PacketPassInterface_Sender_Send(o->output, o->buf, o->buf_consumed);
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} else {
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// receive more data
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StreamRecvInterface_Receiver_Recv(o->input, o->buf + o->buf_used, o->buf_size - o->buf_used);
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}
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}
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static void output_handler_done (LineBuffer *o)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(o->buf_consumed > 0)
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ASSERT(o->buf_consumed <= o->buf_used)
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// update buffer
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memmove(o->buf, o->buf + o->buf_consumed, o->buf_used - o->buf_consumed);
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o->buf_used -= o->buf_consumed;
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// look for newline
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int i;
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for (i = 0; i < o->buf_used; i++) {
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if (o->buf[i] == o->nl_char) {
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break;
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}
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}
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if (i < o->buf_used || o->buf_used == o->buf_size) {
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// pass to output
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o->buf_consumed = (i < o->buf_used ? i + 1 : i);
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PacketPassInterface_Sender_Send(o->output, o->buf, o->buf_consumed);
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} else {
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// receive more data
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StreamRecvInterface_Receiver_Recv(o->input, o->buf + o->buf_used, o->buf_size - o->buf_used);
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}
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}
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int LineBuffer_Init (LineBuffer *o, StreamRecvInterface *input, PacketPassInterface *output, int buf_size, uint8_t nl_char)
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{
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ASSERT(buf_size > 0)
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ASSERT(PacketPassInterface_GetMTU(output) >= buf_size)
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// init arguments
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o->input = input;
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o->output = output;
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o->buf_size = buf_size;
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o->nl_char = nl_char;
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// init input
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StreamRecvInterface_Receiver_Init(o->input, (StreamRecvInterface_handler_done)input_handler_done, o);
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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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// set buffer empty
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o->buf_used = 0;
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// allocate buffer
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if (!(o->buf = (uint8_t *)malloc(o->buf_size))) {
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BLog(BLOG_ERROR, "malloc failed");
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goto fail0;
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}
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// start receiving
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StreamRecvInterface_Receiver_Recv(o->input, o->buf, o->buf_size);
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DebugObject_Init(&o->d_obj);
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return 1;
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fail0:
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return 0;
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}
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void LineBuffer_Free (LineBuffer *o)
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{
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DebugObject_Free(&o->d_obj);
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// free buffer
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free(o->buf);
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}
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