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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * adsi.c - Analogue display service interfaces of various types, including
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5 * ADSI, TDD and most caller ID formats.
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6 *
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7 * Written by Steve Underwood <steveu@coppice.org>
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8 *
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9 * Copyright (C) 2003 Steve Underwood
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10 *
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11 * All rights reserved.
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12 *
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13 * This program is free software; you can redistribute it and/or modify
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14 * it under the terms of the GNU General Public License version 2, as
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15 * published by the Free Software Foundation.
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16 *
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17 * This program is distributed in the hope that it will be useful,
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18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 * GNU General Public License for more details.
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21 *
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22 * You should have received a copy of the GNU General Public License
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23 * along with this program; if not, write to the Free Software
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24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 *
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26 * $Id: adsi.c,v 1.36 2006/11/19 14:07:23 steveu Exp $
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27 */
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28
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29 /*! \file */
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30
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31 #ifdef HAVE_CONFIG_H
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32 #include <config.h>
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33 #endif
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34
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35 #include <inttypes.h>
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36 #include <stdlib.h>
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37 #include <stdio.h>
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38 #include <string.h>
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39 #if defined(HAVE_TGMATH_H)
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40 #include <tgmath.h>
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41 #endif
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42 #if defined(HAVE_MATH_H)
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43 #include <math.h>
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44 #endif
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45 #include <assert.h>
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46
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47 #include "spandsp/telephony.h"
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48 #include "spandsp/logging.h"
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49 #include "spandsp/dds.h"
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50 #include "spandsp/power_meter.h"
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51 #include "spandsp/async.h"
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52 #include "spandsp/hdlc.h"
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53 #include "spandsp/fsk.h"
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54 #include "spandsp/tone_detect.h"
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55 #include "spandsp/tone_generate.h"
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56 #include "spandsp/dtmf.h"
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57 #include "spandsp/adsi.h"
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58
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59 #define BAUDOT_FIGURE_SHIFT 0x1B
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60 #define BAUDOT_LETTER_SHIFT 0x1F
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61
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62 #define SOH 0x01
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63 #define STX 0x02
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64 #define ETX 0x03
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65 #define DLE 0x10
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66 #define SUB 0x1A
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67
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68 static uint8_t adsi_encode_baudot(adsi_tx_state_t *s, uint8_t ch);
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69 static uint8_t adsi_decode_baudot(adsi_rx_state_t *s, uint8_t ch);
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70
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71 static int adsi_tx_get_bit(void *user_data)
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72 {
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73 int bit;
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74 adsi_tx_state_t *s;
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75
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76 s = (adsi_tx_state_t *) user_data;
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77 /* This is similar to the async. handling code in fsk.c, but a few special
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78 things are needed in the preamble, and postamble of an ADSI message. */
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79 if (s->bitno < 300)
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80 {
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81 /* Alternating bit preamble */
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82 bit = s->bitno & 1;
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83 s->bitno++;
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84 }
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85 else if (s->bitno < 300 + s->ones_len)
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86 {
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87 /* All 1s for receiver conditioning */
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88 /* NB: The receiver is an async one. It needs a rest after the
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89 alternating 1/0 sequence so it can reliably pick up on
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90 the next start bit, and sync to the byte stream. */
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91 /* The length of this period varies with the circumstance */
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92 bit = 1;
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93 s->bitno++;
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94 }
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95 else if (s->bitno < 300 + s->ones_len + 1)
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96 {
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97 if (s->bitpos == 0)
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98 {
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99 /* Start bit */
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100 bit = 0;
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101 s->bitpos++;
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102 }
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103 else if (s->bitpos < 9)
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104 {
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105 bit = (s->msg[s->byteno] >> (s->bitpos - 1)) & 1;
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106 s->bitpos++;
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107 }
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108 else
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109 {
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110 /* Stop bit */
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111 bit = 1;
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112 s->bitpos = 0;
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113 s->byteno++;
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114 if (s->byteno > s->msg_len)
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115 s->bitno++;
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116 }
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117 }
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118 else if (s->bitno < 300 + s->ones_len + 5)
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119 {
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120 /* Extra stop bits beyond the last character, to meet the specs., and ensure
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121 all bits are out of the DSP before we shut off the FSK modem. */
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122 bit = 1;
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123 s->bitno++;
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124 }
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125 else
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126 {
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127 bit = 2;
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128 if (s->tx_signal_on)
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129 {
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130 /* The FSK should now be switched off. */
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131 s->tx_signal_on = FALSE;
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132 s->msg_len = 0;
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133 }
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134 }
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135 return bit;
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136 }
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137 /*- End of function --------------------------------------------------------*/
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138
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139 static int adsi_tdd_get_async_byte(void *user_data)
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140 {
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141 adsi_tx_state_t *s;
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142
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143 s = (adsi_tx_state_t *) user_data;
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144 if (s->byteno < s->msg_len)
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145 return s->msg[s->byteno++];
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146 if (s->tx_signal_on)
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147 {
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148 /* The FSK should now be switched off. */
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149 s->tx_signal_on = FALSE;
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150 s->msg_len = 0;
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151 }
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152 return 0x1F;
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153 }
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154 /*- End of function --------------------------------------------------------*/
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155
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156 static void adsi_rx_put_bit(void *user_data, int bit)
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157 {
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158 adsi_rx_state_t *s;
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159 int i;
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160 int sum;
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161
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162 s = (adsi_rx_state_t *) user_data;
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163 if (bit < 0)
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164 {
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165 /* Special conditions */
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166 switch (bit)
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167 {
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168 case PUTBIT_CARRIER_UP:
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169 span_log(&s->logging, SPAN_LOG_FLOW, "Carrier up.\n");
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170 s->consecutive_ones = 0;
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171 s->bitpos = 0;
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172 s->in_progress = 0;
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173 s->msg_len = 0;
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174 s->baudot_shift = 0;
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175 break;
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176 case PUTBIT_CARRIER_DOWN:
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177 span_log(&s->logging, SPAN_LOG_FLOW, "Carrier down.\n");
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178 break;
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179 default:
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180 span_log(&s->logging, SPAN_LOG_WARNING, "Unexpected special put bit value - %d!\n", bit);
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181 break;
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182 }
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183 return;
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184 }
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185 bit &= 1;
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186 if (s->bitpos == 0)
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187 {
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188 if (bit == 0)
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189 {
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190 /* Start bit */
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191 s->bitpos++;
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192 if (s->consecutive_ones > 10)
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193 {
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194 /* This is a line idle condition, which means we should
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195 restart message acquisition */
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196 s->msg_len = 0;
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197 }
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198 s->consecutive_ones = 0;
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199 }
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200 else
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201 {
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202 s->consecutive_ones++;
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203 }
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204 }
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205 else if (s->bitpos <= 8)
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206 {
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207 s->in_progress >>= 1;
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208 if (bit)
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209 s->in_progress |= 0x80;
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210 s->bitpos++;
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211 }
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212 else
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213 {
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214 /* Stop bit */
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215 if (bit)
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216 {
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217 if (s->msg_len < 256)
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218 {
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219 if (s->standard == ADSI_STANDARD_JCLIP)
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220 {
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221 if (s->msg_len == 0)
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222 {
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223 /* A message should start DLE SOH, but let's just check
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224 we are starting with a DLE for now */
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225 if (s->in_progress == (0x80 | DLE))
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226 s->msg[s->msg_len++] = (uint8_t) s->in_progress;
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227 }
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228 else
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229 {
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230 s->msg[s->msg_len++] = (uint8_t) s->in_progress;
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231 }
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232 if (s->msg_len >= 11 && s->msg_len == ((s->msg[6] & 0x7F) + 11))
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233 {
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234 /* Test the CRC-16 */
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235 if (crc_itu16_calc(s->msg + 2, s->msg_len - 2, 0) == 0)
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236 {
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237 /* Strip off the parity bits. It doesn't seem
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238 worthwhile actually checking the parity if a
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239 CRC check has succeeded. */
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240 for (i = 0; i < s->msg_len - 2; i++)
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241 s->msg[i] &= 0x7F;
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242 /* Put everything, except the CRC octets */
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243 s->put_msg(s->user_data, s->msg, s->msg_len - 2);
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244 }
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245 else
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246 {
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247 span_log(&s->logging, SPAN_LOG_WARNING, "CRC failed\n");
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248 }
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249 s->msg_len = 0;
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250 }
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251 }
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252 else
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253 {
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254 s->msg[s->msg_len++] = (uint8_t) s->in_progress;
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255 if (s->msg_len >= 3 && s->msg_len == (s->msg[1] + 3))
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256 {
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257 /* Test the checksum */
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258 sum = 0;
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259 for (i = 0; i < s->msg_len - 1; i++)
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260 sum += s->msg[i];
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261 if ((-sum & 0xFF) == s->msg[i])
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262 s->put_msg(s->user_data, s->msg, s->msg_len - 1);
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263 else
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264 span_log(&s->logging, SPAN_LOG_WARNING, "Sumcheck failed\n");
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265 s->msg_len = 0;
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266 }
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267 }
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268 }
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269 }
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270 else
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271 {
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272 s->framing_errors++;
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273 }
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274 s->bitpos = 0;
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275 s->in_progress = 0;
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276 }
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277 }
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278 /*- End of function --------------------------------------------------------*/
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279
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280 static void adsi_tdd_put_async_byte(void *user_data, int byte)
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281 {
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282 adsi_rx_state_t *s;
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283 uint8_t octet;
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284
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285 s = (adsi_rx_state_t *) user_data;
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286 if (byte < 0)
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287 {
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288 /* Special conditions */
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289 switch (byte)
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290 {
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291 case PUTBIT_CARRIER_UP:
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292 span_log(&s->logging, SPAN_LOG_FLOW, "Carrier up.\n");
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293 s->consecutive_ones = 0;
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294 s->bitpos = 0;
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295 s->in_progress = 0;
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296 s->msg_len = 0;
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297 s->baudot_shift = 0;
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298 break;
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299 case PUTBIT_CARRIER_DOWN:
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300 span_log(&s->logging, SPAN_LOG_FLOW, "Carrier down.\n");
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301 if (s->msg_len > 0)
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302 {
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303 /* Whatever we have to date constitutes the message */
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304 s->put_msg(s->user_data, s->msg, s->msg_len);
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305 s->msg_len = 0;
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306 }
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307 break;
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308 default:
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309 span_log(&s->logging, SPAN_LOG_WARNING, "Unexpected special put byte value - %d!\n", byte);
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310 break;
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311 }
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312 return;
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313 }
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314 if ((octet = adsi_decode_baudot(s, (uint8_t) byte)))
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315 s->msg[s->msg_len++] = octet;
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316 if (s->msg_len >= 256)
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317 {
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318 s->put_msg(s->user_data, s->msg, s->msg_len);
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319 s->msg_len = 0;
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320 }
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321 }
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322 /*- End of function --------------------------------------------------------*/
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323
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324 static void adsi_rx_dtmf(void *user_data, const char *digits, int len)
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325 {
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326 adsi_rx_state_t *s;
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327
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328 s = (adsi_rx_state_t *) user_data;
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329 if (s->msg_len == 0)
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330 {
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331 /* Message starting. Start a 10s timeout, to make things more noise
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332 tolerant for a detector running continuously when on hook. */
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333 s->in_progress = 80000;
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334 }
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335 for ( ; len && s->msg_len < 256; len--)
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336 {
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337 if (*digits == '#')
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338 {
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339 s->put_msg(s->user_data, s->msg, s->msg_len);
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340 s->msg_len = 0;
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341 }
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342 else
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343 {
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344 s->msg[s->msg_len++] = *digits++;
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345 }
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346 }
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347 }
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348 /*- End of function --------------------------------------------------------*/
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349
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350 static void start_tx(adsi_tx_state_t *s)
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351 {
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352 switch (s->standard)
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353 {
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354 case ADSI_STANDARD_CLASS:
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355 fsk_tx_init(&(s->fsktx), &preset_fsk_specs[FSK_BELL202], adsi_tx_get_bit, s);
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356 break;
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357 case ADSI_STANDARD_CLIP:
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358 case ADSI_STANDARD_ACLIP:
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359 case ADSI_STANDARD_JCLIP:
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360 fsk_tx_init(&(s->fsktx), &preset_fsk_specs[FSK_V23CH1], adsi_tx_get_bit, s);
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361 break;
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362 case ADSI_STANDARD_CLIP_DTMF:
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363 dtmf_tx_init(&(s->dtmftx));
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364 break;
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365 case ADSI_STANDARD_TDD:
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366 fsk_tx_init(&(s->fsktx), &preset_fsk_specs[FSK_WEITBRECHT], async_tx_get_bit, &(s->asynctx));
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367 async_tx_init(&(s->asynctx), 5, ASYNC_PARITY_NONE, 2, FALSE, adsi_tdd_get_async_byte, s);
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368 /* Schedule an explicit shift at the start of baudot transmission */
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369 s->baudot_shift = 2;
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370 break;
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371 }
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372 s->tx_signal_on = TRUE;
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373 }
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374 /*- End of function --------------------------------------------------------*/
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375
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376 void adsi_rx(adsi_rx_state_t *s, const int16_t *amp, int len)
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377 {
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378 switch (s->standard)
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379 {
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380 case ADSI_STANDARD_CLIP_DTMF:
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381 /* Apply a message timeout. */
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382 s->in_progress -= len;
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383 if (s->in_progress <= 0)
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384 s->msg_len = 0;
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385 dtmf_rx(&(s->dtmfrx), amp, len);
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386 break;
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387 default:
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388 fsk_rx(&(s->fskrx), amp, len);
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389 break;
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390 }
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391 }
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392 /*- End of function --------------------------------------------------------*/
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393
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394 void adsi_rx_init(adsi_rx_state_t *s,
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395 int standard,
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396 put_msg_func_t put_msg,
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397 void *user_data)
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398 {
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399 memset(s, 0, sizeof(*s));
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400 s->put_msg = put_msg;
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401 s->user_data = user_data;
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402 switch (standard)
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403 {
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404 case ADSI_STANDARD_CLASS:
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405 fsk_rx_init(&(s->fskrx), &preset_fsk_specs[FSK_BELL202], FALSE, adsi_rx_put_bit, s);
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406 break;
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407 case ADSI_STANDARD_CLIP:
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408 case ADSI_STANDARD_ACLIP:
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409 case ADSI_STANDARD_JCLIP:
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410 fsk_rx_init(&(s->fskrx), &preset_fsk_specs[FSK_V23CH1], FALSE, adsi_rx_put_bit, s);
|
|
|
411 break;
|
|
|
412 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
413 dtmf_rx_init(&(s->dtmfrx), adsi_rx_dtmf, s);
|
|
|
414 break;
|
|
|
415 case ADSI_STANDARD_TDD:
|
|
|
416 fsk_rx_init(&(s->fskrx), &preset_fsk_specs[FSK_WEITBRECHT], FALSE, async_rx_put_bit, &(s->asyncrx));
|
|
|
417 async_rx_init(&(s->asyncrx), 5, ASYNC_PARITY_NONE, 2, TRUE, adsi_tdd_put_async_byte, s);
|
|
|
418 break;
|
|
|
419 }
|
|
|
420 s->standard = standard;
|
|
|
421 span_log_init(&s->logging, SPAN_LOG_NONE, NULL);
|
|
|
422 }
|
|
|
423 /*- End of function --------------------------------------------------------*/
|
|
|
424
|
|
|
425 int adsi_tx(adsi_tx_state_t *s, int16_t *amp, int max_len)
|
|
|
426 {
|
|
|
427 int len;
|
|
|
428
|
|
|
429 len = tone_gen(&(s->alert_tone_gen), amp, max_len);
|
|
|
430 switch (s->standard)
|
|
|
431 {
|
|
|
432 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
433 if (len < max_len)
|
|
|
434 len += dtmf_tx(&(s->dtmftx), amp, max_len - len);
|
|
|
435 break;
|
|
|
436 default:
|
|
|
437 if (len < max_len && s->tx_signal_on)
|
|
|
438 len += fsk_tx(&(s->fsktx), amp + len, max_len - len);
|
|
|
439 break;
|
|
|
440 }
|
|
|
441 return len;
|
|
|
442 }
|
|
|
443 /*- End of function --------------------------------------------------------*/
|
|
|
444
|
|
|
445 void adsi_send_alert_tone(adsi_tx_state_t *s)
|
|
|
446 {
|
|
|
447 tone_gen_init(&(s->alert_tone_gen), &(s->alert_tone_desc));
|
|
|
448 }
|
|
|
449 /*- End of function --------------------------------------------------------*/
|
|
|
450
|
|
|
451 int adsi_put_message(adsi_tx_state_t *s, uint8_t *msg, int len)
|
|
|
452 {
|
|
|
453 int i;
|
|
|
454 int j;
|
|
|
455 int k;
|
|
|
456 int byte;
|
|
|
457 int parity;
|
|
|
458 int sum;
|
|
|
459 size_t ii;
|
|
|
460 uint16_t crc_value;
|
|
|
461
|
|
|
462 /* Don't inject a new message when a previous one is still in progress */
|
|
|
463 if (s->msg_len > 0)
|
|
|
464 return 0;
|
|
|
465 if (!s->tx_signal_on)
|
|
|
466 {
|
|
|
467 /* We need to restart the modem */
|
|
|
468 start_tx(s);
|
|
|
469 }
|
|
|
470 switch (s->standard)
|
|
|
471 {
|
|
|
472 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
473 if (len >= 128)
|
|
|
474 return -1;
|
|
|
475 msg[len] = '\0';
|
|
|
476 len -= (int) dtmf_tx_put(&(s->dtmftx), (char *) msg);
|
|
|
477 break;
|
|
|
478 case ADSI_STANDARD_JCLIP:
|
|
|
479 if (len > 128 - 9)
|
|
|
480 return -1;
|
|
|
481 i = 0;
|
|
|
482 s->msg[i++] = DLE;
|
|
|
483 s->msg[i++] = SOH;
|
|
|
484 s->msg[i++] = 0x07; //header
|
|
|
485 s->msg[i++] = DLE;
|
|
|
486 s->msg[i++] = STX;
|
|
|
487 s->msg[i++] = msg[0];
|
|
|
488 s->msg[i++] = (uint8_t) (len - 2);
|
|
|
489 /* We might need to byte stuff the overall length, but the rest of the
|
|
|
490 message should already be stuffed. */
|
|
|
491 if (len - 2 == DLE)
|
|
|
492 s->msg[i++] = DLE;
|
|
|
493 memcpy(&s->msg[i], &msg[2], len - 2);
|
|
|
494 i += len - 2;
|
|
|
495 s->msg[i++] = DLE;
|
|
|
496 s->msg[i++] = ETX;
|
|
|
497
|
|
|
498 /* Set the parity bits */
|
|
|
499 for (j = 0; j < i; j++)
|
|
|
500 {
|
|
|
501 byte = s->msg[j];
|
|
|
502 parity = 0;
|
|
|
503 for (k = 1; k <= 7; k++)
|
|
|
504 parity ^= (byte << k);
|
|
|
505 s->msg[j] = (s->msg[j] & 0x7F) | ((uint8_t) parity & 0x80);
|
|
|
506 }
|
|
|
507
|
|
|
508 crc_value = crc_itu16_calc(s->msg + 2, i - 2, 0);
|
|
|
509 s->msg[i++] = (uint8_t) (crc_value & 0xFF);
|
|
|
510 s->msg[i++] = (uint8_t) ((crc_value >> 8) & 0xFF);
|
|
|
511 s->msg_len = i;
|
|
|
512
|
|
|
513 s->ones_len = 80;
|
|
|
514 break;
|
|
|
515 case ADSI_STANDARD_TDD:
|
|
|
516 if (len > 255)
|
|
|
517 return -1;
|
|
|
518 memcpy(s->msg, msg, len);
|
|
|
519 s->msg_len = len;
|
|
|
520 break;
|
|
|
521 default:
|
|
|
522 if (len > 255)
|
|
|
523 return -1;
|
|
|
524 memcpy(s->msg, msg, len);
|
|
|
525 /* Force the length in case it is wrong */
|
|
|
526 s->msg[1] = (uint8_t) (len - 2);
|
|
|
527 /* Add the sumcheck */
|
|
|
528 sum = 0;
|
|
|
529 for (ii = 0; ii < (size_t) len; ii++)
|
|
|
530 sum += s->msg[ii];
|
|
|
531 s->msg[len] = (uint8_t) ((-sum) & 0xFF);
|
|
|
532 s->msg_len = len + 1;
|
|
|
533 s->ones_len = 80;
|
|
|
534 break;
|
|
|
535 }
|
|
|
536 /* Prepare the bit sequencing */
|
|
|
537 s->byteno = 0;
|
|
|
538 s->bitpos = 0;
|
|
|
539 s->bitno = 0;
|
|
|
540 return len;
|
|
|
541 }
|
|
|
542 /*- End of function --------------------------------------------------------*/
|
|
|
543
|
|
|
544 void adsi_tx_init(adsi_tx_state_t *s, int standard)
|
|
|
545 {
|
|
|
546 memset(s, 0, sizeof(*s));
|
|
|
547 make_tone_gen_descriptor(&(s->alert_tone_desc),
|
|
|
548 2130,
|
|
|
549 -13,
|
|
|
550 2750,
|
|
|
551 -13,
|
|
|
552 110,
|
|
|
553 60,
|
|
|
554 0,
|
|
|
555 0,
|
|
|
556 FALSE);
|
|
|
557 s->standard = standard;
|
|
|
558 span_log_init(&s->logging, SPAN_LOG_NONE, NULL);
|
|
|
559 start_tx(s);
|
|
|
560 }
|
|
|
561 /*- End of function --------------------------------------------------------*/
|
|
|
562
|
|
|
563 static uint8_t adsi_encode_baudot(adsi_tx_state_t *s, uint8_t ch)
|
|
|
564 {
|
|
|
565 static const uint8_t conv[128] =
|
|
|
566 {
|
|
|
567 0x00, /* NUL */
|
|
|
568 0xFF, /* */
|
|
|
569 0xFF, /* */
|
|
|
570 0xFF, /* */
|
|
|
571 0xFF, /* */
|
|
|
572 0xFF, /* */
|
|
|
573 0xFF, /* */
|
|
|
574 0xFF, /* */
|
|
|
575 0xFF, /* */
|
|
|
576 0xFF, /* */
|
|
|
577 0x42, /* LF */
|
|
|
578 0xFF, /* */
|
|
|
579 0xFF, /* */
|
|
|
580 0x48, /* CR */
|
|
|
581 0xFF, /* */
|
|
|
582 0xFF, /* */
|
|
|
583 0xFF, /* */
|
|
|
584 0xFF, /* */
|
|
|
585 0xFF, /* */
|
|
|
586 0xFF, /* */
|
|
|
587 0xFF, /* */
|
|
|
588 0xFF, /* */
|
|
|
589 0xFF, /* */
|
|
|
590 0xFF, /* */
|
|
|
591 0xFF, /* */
|
|
|
592 0xFF, /* */
|
|
|
593 0xFF, /* */
|
|
|
594 0xFF, /* */
|
|
|
595 0xFF, /* */
|
|
|
596 0xFF, /* */
|
|
|
597 0xFF, /* */
|
|
|
598 0xFF, /* */
|
|
|
599 0x44, /* */
|
|
|
600 0xFF, /* ! */
|
|
|
601 0xFF, /* " */
|
|
|
602 0x94, /* # */
|
|
|
603 0x89, /* $ */
|
|
|
604 0xFF, /* % */
|
|
|
605 0xFF, /* & */
|
|
|
606 0x85, /* ' */
|
|
|
607 0x8F, /* ( */
|
|
|
608 0x92, /* ) */
|
|
|
609 0x8B, /* * */
|
|
|
610 0x91, /* + */
|
|
|
611 0x8C, /* , */
|
|
|
612 0x83, /* - */
|
|
|
613 0x9C, /* . */
|
|
|
614 0x9D, /* / */
|
|
|
615 0x96, /* 0 */
|
|
|
616 0x97, /* 1 */
|
|
|
617 0x93, /* 2 */
|
|
|
618 0x81, /* 3 */
|
|
|
619 0x8A, /* 4 */
|
|
|
620 0x90, /* 5 */
|
|
|
621 0x95, /* 6 */
|
|
|
622 0x87, /* 7 */
|
|
|
623 0x86, /* 8 */
|
|
|
624 0x98, /* 9 */
|
|
|
625 0x8E, /* : */
|
|
|
626 0xFF, /* ; */
|
|
|
627 0xFF, /* < */
|
|
|
628 0x9E, /* = */
|
|
|
629 0xFF, /* > */
|
|
|
630 0x99, /* ? */
|
|
|
631 0xFF, /* @ */
|
|
|
632 0x03, /* A */
|
|
|
633 0x19, /* B */
|
|
|
634 0x0E, /* C */
|
|
|
635 0x09, /* D */
|
|
|
636 0x01, /* E */
|
|
|
637 0x0D, /* F */
|
|
|
638 0x1A, /* G */
|
|
|
639 0x14, /* H */
|
|
|
640 0x06, /* I */
|
|
|
641 0x0B, /* J */
|
|
|
642 0x0F, /* K */
|
|
|
643 0x12, /* L */
|
|
|
644 0x1C, /* M */
|
|
|
645 0x0C, /* N */
|
|
|
646 0x18, /* O */
|
|
|
647 0x16, /* P */
|
|
|
648 0x17, /* Q */
|
|
|
649 0x0A, /* R */
|
|
|
650 0x05, /* S */
|
|
|
651 0x10, /* T */
|
|
|
652 0x07, /* U */
|
|
|
653 0x1E, /* V */
|
|
|
654 0x13, /* W */
|
|
|
655 0x1D, /* X */
|
|
|
656 0x15, /* Y */
|
|
|
657 0x11, /* Z */
|
|
|
658 0xFF, /* [ */
|
|
|
659 0xFF, /* \ */
|
|
|
660 0xFF, /* ] */
|
|
|
661 0x9B, /* ^ */
|
|
|
662 0xFF, /* _ */
|
|
|
663 0xFF, /* ` */
|
|
|
664 0x03, /* a */
|
|
|
665 0x19, /* b */
|
|
|
666 0x0E, /* c */
|
|
|
667 0x09, /* d */
|
|
|
668 0x01, /* e */
|
|
|
669 0x0D, /* f */
|
|
|
670 0x1A, /* g */
|
|
|
671 0x14, /* h */
|
|
|
672 0x06, /* i */
|
|
|
673 0x0B, /* j */
|
|
|
674 0x0F, /* k */
|
|
|
675 0x12, /* l */
|
|
|
676 0x1C, /* m */
|
|
|
677 0x0C, /* n */
|
|
|
678 0x18, /* o */
|
|
|
679 0x16, /* p */
|
|
|
680 0x17, /* q */
|
|
|
681 0x0A, /* r */
|
|
|
682 0x05, /* s */
|
|
|
683 0x10, /* t */
|
|
|
684 0x07, /* u */
|
|
|
685 0x1E, /* v */
|
|
|
686 0x13, /* w */
|
|
|
687 0x1D, /* x */
|
|
|
688 0x15, /* y */
|
|
|
689 0x11, /* z */
|
|
|
690 0xFF, /* { */
|
|
|
691 0xFF, /* | */
|
|
|
692 0xFF, /* } */
|
|
|
693 0xFF, /* ~ */
|
|
|
694 0xFF, /* DEL */
|
|
|
695 };
|
|
|
696
|
|
|
697 ch = conv[ch];
|
|
|
698 if (ch != 0xFF)
|
|
|
699 {
|
|
|
700 if ((ch & 0x40))
|
|
|
701 return ch & 0x1F;
|
|
|
702 if ((ch & 0x80))
|
|
|
703 {
|
|
|
704 if (s->baudot_shift == 1)
|
|
|
705 return ch & 0x1F;
|
|
|
706 s->baudot_shift = 1;
|
|
|
707 return (BAUDOT_FIGURE_SHIFT << 5) | (ch & 0x1F);
|
|
|
708 }
|
|
|
709 else
|
|
|
710 {
|
|
|
711 if (s->baudot_shift == 0)
|
|
|
712 return ch & 0x1F;
|
|
|
713 s->baudot_shift = 0;
|
|
|
714 return (BAUDOT_LETTER_SHIFT << 5) | (ch & 0x1F);
|
|
|
715 }
|
|
|
716 }
|
|
|
717 return 0;
|
|
|
718 }
|
|
|
719 /*- End of function --------------------------------------------------------*/
|
|
|
720
|
|
|
721 static uint8_t adsi_decode_baudot(adsi_rx_state_t *s, uint8_t ch)
|
|
|
722 {
|
|
|
723 static const uint8_t conv[2][32] =
|
|
|
724 {
|
|
|
725 {"\000E\nA SIU\rDRJNFCKTZLWHYPQOBG^MXV^"},
|
|
|
726 {"\0003\n- '87\r$4*,*:(5+)2#6019?*^./=^"}
|
|
|
727 };
|
|
|
728
|
|
|
729 switch (ch)
|
|
|
730 {
|
|
|
731 case BAUDOT_FIGURE_SHIFT:
|
|
|
732 s->baudot_shift = 1;
|
|
|
733 break;
|
|
|
734 case BAUDOT_LETTER_SHIFT:
|
|
|
735 s->baudot_shift = 0;
|
|
|
736 break;
|
|
|
737 default:
|
|
|
738 return conv[s->baudot_shift][ch];
|
|
|
739 }
|
|
|
740 /* return 0 if we did not produce a character */
|
|
|
741 return 0;
|
|
|
742 }
|
|
|
743 /*- End of function --------------------------------------------------------*/
|
|
|
744
|
|
|
745 int adsi_next_field(adsi_rx_state_t *s, const uint8_t *msg, int msg_len, int pos, uint8_t *field_type, uint8_t const **field_body, int *field_len)
|
|
|
746 {
|
|
|
747 int i;
|
|
|
748
|
|
|
749 /* Return -1 for no more fields. Return -2 for message structure corrupt. */
|
|
|
750 switch (s->standard)
|
|
|
751 {
|
|
|
752 case ADSI_STANDARD_CLASS:
|
|
|
753 case ADSI_STANDARD_CLIP:
|
|
|
754 case ADSI_STANDARD_ACLIP:
|
|
|
755 if (pos >= msg_len)
|
|
|
756 return -1;
|
|
|
757 /* For MDMF type messages, these standards all use "IE" type fields - type,
|
|
|
758 length, contents - and similar headers */
|
|
|
759 if (pos <= 0)
|
|
|
760 {
|
|
|
761 /* Return the message type */
|
|
|
762 *field_type = msg[0];
|
|
|
763 *field_len = 0;
|
|
|
764 *field_body = NULL;
|
|
|
765 pos = 2;
|
|
|
766 }
|
|
|
767 else
|
|
|
768 {
|
|
|
769 if ((msg[0] & 0x80))
|
|
|
770 {
|
|
|
771 /* MDMF messages seem to always have a message type with the MSB set. Is that
|
|
|
772 guaranteed? */
|
|
|
773 *field_type = msg[pos++];
|
|
|
774 *field_len = msg[pos++];
|
|
|
775 *field_body = msg + pos;
|
|
|
776 }
|
|
|
777 else
|
|
|
778 {
|
|
|
779 /* SDMF */
|
|
|
780 *field_type = 0;
|
|
|
781 *field_len = msg_len - pos;
|
|
|
782 *field_body = msg + pos;
|
|
|
783 }
|
|
|
784 pos += *field_len;
|
|
|
785 }
|
|
|
786 if (pos > msg_len)
|
|
|
787 return -2;
|
|
|
788 break;
|
|
|
789 case ADSI_STANDARD_JCLIP:
|
|
|
790 if (pos >= msg_len - 2)
|
|
|
791 return -1;
|
|
|
792 if (pos <= 0)
|
|
|
793 {
|
|
|
794 /* Return the message type */
|
|
|
795 pos = 5;
|
|
|
796 *field_type = msg[pos++];
|
|
|
797 if (*field_type == DLE)
|
|
|
798 pos++;
|
|
|
799 if (msg[pos++] == DLE)
|
|
|
800 pos++;
|
|
|
801 *field_len = 0;
|
|
|
802 *field_body = NULL;
|
|
|
803 }
|
|
|
804 else
|
|
|
805 {
|
|
|
806 *field_type = msg[pos++];
|
|
|
807 if (*field_type == DLE)
|
|
|
808 pos++;
|
|
|
809 *field_len = msg[pos++];
|
|
|
810 if (*field_len == DLE)
|
|
|
811 pos++;
|
|
|
812 /* TODO: we assume here that the body contains no DLE's that would have been stuffed */
|
|
|
813 *field_body = msg + pos;
|
|
|
814 pos += *field_len;
|
|
|
815 }
|
|
|
816 if (pos > msg_len - 2)
|
|
|
817 return -2;
|
|
|
818 break;
|
|
|
819 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
820 if (pos >= msg_len)
|
|
|
821 return -1;
|
|
|
822 if (pos < 0)
|
|
|
823 pos = 0;
|
|
|
824 *field_type = msg[pos++];
|
|
|
825 *field_body = msg + pos;
|
|
|
826 i = pos;
|
|
|
827 while (i < msg_len && msg[i] != '#')
|
|
|
828 i++;
|
|
|
829 *field_len = i - pos;
|
|
|
830 pos = i;
|
|
|
831 if (msg[pos] == '#')
|
|
|
832 pos++;
|
|
|
833 if (pos > msg_len)
|
|
|
834 return -2;
|
|
|
835 break;
|
|
|
836 case ADSI_STANDARD_TDD:
|
|
|
837 if (pos >= msg_len)
|
|
|
838 return -1;
|
|
|
839 *field_type = 0;
|
|
|
840 *field_body = msg;
|
|
|
841 *field_len = msg_len;
|
|
|
842 pos = msg_len;
|
|
|
843 break;
|
|
|
844 }
|
|
|
845 return pos;
|
|
|
846 }
|
|
|
847 /*- End of function --------------------------------------------------------*/
|
|
|
848
|
|
|
849 int adsi_add_field(adsi_tx_state_t *s, uint8_t *msg, int len, uint8_t field_type, uint8_t const *field_body, int field_len)
|
|
|
850 {
|
|
|
851 int i;
|
|
|
852 int x;
|
|
|
853
|
|
|
854 switch (s->standard)
|
|
|
855 {
|
|
|
856 case ADSI_STANDARD_CLASS:
|
|
|
857 case ADSI_STANDARD_CLIP:
|
|
|
858 case ADSI_STANDARD_ACLIP:
|
|
|
859 /* These standards all use "IE" type fields - type, length, value - and similar headers */
|
|
|
860 if (len <= 0)
|
|
|
861 {
|
|
|
862 /* Initialise a new message. The field type is actually the message type. */
|
|
|
863 msg[0] = field_type;
|
|
|
864 msg[1] = 0;
|
|
|
865 len = 2;
|
|
|
866 }
|
|
|
867 else
|
|
|
868 {
|
|
|
869 /* Add to a message in progress. */
|
|
|
870 if (field_type)
|
|
|
871 {
|
|
|
872 msg[len++] = field_type;
|
|
|
873 msg[len++] = (uint8_t) field_len;
|
|
|
874 if (field_len == DLE)
|
|
|
875 msg[len++] = (uint8_t) field_len;
|
|
|
876 memcpy(msg + len, field_body, field_len);
|
|
|
877 len += field_len;
|
|
|
878 }
|
|
|
879 else
|
|
|
880 {
|
|
|
881 /* No field type or length, for restricted single message formats */
|
|
|
882 memcpy(msg + len, field_body, field_len);
|
|
|
883 len += field_len;
|
|
|
884 }
|
|
|
885 }
|
|
|
886 break;
|
|
|
887 case ADSI_STANDARD_JCLIP:
|
|
|
888 /* This standard uses "IE" type fields - type, length, value - but escapes DLE characters,
|
|
|
889 to prevent immitation of a control octet. */
|
|
|
890 if (len <= 0)
|
|
|
891 {
|
|
|
892 /* Initialise a new message. The field type is actually the message type. */
|
|
|
893 msg[0] = field_type;
|
|
|
894 msg[1] = 0;
|
|
|
895 len = 2;
|
|
|
896 }
|
|
|
897 else
|
|
|
898 {
|
|
|
899 /* Add to a message in progress. */
|
|
|
900 msg[len++] = field_type;
|
|
|
901 if (field_type == DLE)
|
|
|
902 msg[len++] = field_type;
|
|
|
903 msg[len++] = (uint8_t) field_len;
|
|
|
904 if (field_len == DLE)
|
|
|
905 msg[len++] = (uint8_t) field_len;
|
|
|
906 for (i = 0; i < field_len; i++)
|
|
|
907 {
|
|
|
908 msg[len++] = field_body[i];
|
|
|
909 if (field_body[i] == DLE)
|
|
|
910 msg[len++] = field_body[i];
|
|
|
911 }
|
|
|
912 }
|
|
|
913 break;
|
|
|
914 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
915 if (len < 0)
|
|
|
916 {
|
|
|
917 len = 0;
|
|
|
918 }
|
|
|
919 else
|
|
|
920 {
|
|
|
921 msg[len] = field_type;
|
|
|
922 memcpy(msg + len + 1, field_body, field_len);
|
|
|
923 msg[len + field_len + 1] = '#';
|
|
|
924 len += (field_len + 2);
|
|
|
925 }
|
|
|
926 break;
|
|
|
927 case ADSI_STANDARD_TDD:
|
|
|
928 if (len < 0)
|
|
|
929 len = 0;
|
|
|
930 for (i = 0; i < field_len; i++)
|
|
|
931 {
|
|
|
932 if ((x = adsi_encode_baudot(s, field_body[i])))
|
|
|
933 {
|
|
|
934 if ((x & 0x3E0))
|
|
|
935 msg[len++] = (uint8_t) ((x >> 5) & 0x1F);
|
|
|
936 msg[len++] = (uint8_t) (x & 0x1F);
|
|
|
937 }
|
|
|
938 }
|
|
|
939 break;
|
|
|
940 }
|
|
|
941
|
|
|
942 return len;
|
|
|
943 }
|
|
|
944 /*- End of function --------------------------------------------------------*/
|
|
|
945
|
|
|
946 const char *adsi_standard_to_str(int standard)
|
|
|
947 {
|
|
|
948 switch (standard)
|
|
|
949 {
|
|
|
950 case ADSI_STANDARD_CLASS:
|
|
|
951 return "CLASS";
|
|
|
952 case ADSI_STANDARD_CLIP:
|
|
|
953 return "CLIP";
|
|
|
954 case ADSI_STANDARD_ACLIP:
|
|
|
955 return "A-CLIP";
|
|
|
956 case ADSI_STANDARD_JCLIP:
|
|
|
957 return "J-CLIP";
|
|
|
958 case ADSI_STANDARD_CLIP_DTMF:
|
|
|
959 return "CLIP-DTMF";
|
|
|
960 case ADSI_STANDARD_TDD:
|
|
|
961 return "TDD";
|
|
|
962 }
|
|
|
963 return "???";
|
|
|
964 }
|
|
|
965 /*- End of function --------------------------------------------------------*/
|
|
|
966 /*- End of file ------------------------------------------------------------*/
|
