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115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
/*
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* fw/dispatch.c - Wireless protocol dispatcher
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "version.h"
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#include "rf.h"
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#include "proto.h"
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#include "dispatch.h"
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static uint8_t seq; /* last sequence number seen */
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static uint8_t type; /* type currently being processed */
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static uint8_t limit; /* last limit seen */
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static const struct handler *curr_proto = NULL;
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static void send_ack(const uint8_t *buf)
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{
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uint8_t ack[3] = { buf[0]+1, buf[1], 0 };
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rf_send(ack, sizeof(ack));
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}
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static bool answer_ping(const uint8_t *buf)
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{
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char num[6]; /* let's hope we won't need more than 9999 versions */
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char *num_end = num+sizeof(num);
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int date_len = strlen(build_date);
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int num_len;
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uint8_t pong[3] = { PONG, 0, 0 };
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uint8_t tmp[3+6+date_len+1];
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char *s;
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int n;
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if (buf[1])
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return 0;
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s = num_end-1;
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*s = ' ';
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for (n = build_number; n; n /= 10)
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*--s = '0'+n % 10;
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*--s = '#';
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num_len = num_end-s;
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memcpy(tmp, pong, 3);
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memcpy(tmp+3, s, num_len);
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memcpy(tmp+3+num_len, build_date, date_len);
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rf_send(tmp, 3+num_len+date_len);
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return 1;
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}
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bool dispatch(const uint8_t *buf, uint8_t len, const struct handler **protos)
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{
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if (len == 3 && buf[0] == PING)
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return answer_ping(buf);
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if (len != 64+3)
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return 0;
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if (!buf[1]) {
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while (*protos) {
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if ((*protos)->type == buf[0])
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break;
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protos++;
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}
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if (!*protos)
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return 0;
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if (!(*protos)->first(buf[2], buf+3))
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return 0;
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curr_proto = *protos;
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type = buf[0];
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seq = 1;
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limit = buf[2];
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send_ack(buf);
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return 1;
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}
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if (!curr_proto)
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return 0;
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if (buf[0] != type)
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return 0;
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if (buf[2] != limit)
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return 0;
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if (buf[1] > limit)
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return 0;
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if (buf[1]+1 == seq) {
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send_ack(buf);
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return 0;
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}
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if (buf[1] != seq)
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return 0;
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if (!curr_proto->more(seq, limit, buf+3))
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return 0;
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seq++;
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send_ack(buf);
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return 1;
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}
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