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annotate enc-text/gsm7.c @ 31:19476164c54d

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doc/SMS-PDU-decoding: document imported utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Jun 2024 18:48:58 +0000
parents e56bb9f09ff1
children
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1 /*
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2 * In this module we implement SMS encoding in GSM7.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <unistd.h>
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11 #include "defs.h"
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12
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13 extern int utf8_input, allow_escape;
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14 extern int concat_enable, concat_refno_set;
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15 extern char msgtext[MAX_MSG_CHARS*2+2];
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16 extern u_char concat_refno;
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17
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18 gsm7_mode_main()
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19 {
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20 u_char msgtext_gsm7[MAX_MSG_CHARS];
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21 unsigned msgtext_gsmlen;
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22 int rc;
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23 unsigned nparts, n;
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24 u_char udh[6];
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25 unsigned pos, remain, chunk;
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26
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27 if (utf8_input && utf8_to_latin1(msgtext) < 0) {
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28 fprintf(stderr, "error: invalid UTF-8 message\n");
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29 exit(1);
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30 }
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31 rc = latin1_to_gsm7(msgtext, msgtext_gsm7, MAX_MSG_CHARS,
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32 &msgtext_gsmlen, allow_escape);
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33 if (rc == -1) {
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34 fprintf(stderr, "error: message not valid for GSM7 charset\n");
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35 exit(1);
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36 }
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37 if (rc == -2) {
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38 fprintf(stderr, "error: message too long for max concat SMS\n");
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39 exit(1);
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40 }
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41 if (rc == -3) {
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42 fprintf(stderr,
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43 "error: message contains invalid backslash escape\n");
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44 exit(1);
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45 }
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46 if (msgtext_gsmlen <= 160) {
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47 fputs("dcs 0 septet\nmsg ", stdout);
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48 if (msgtext_gsmlen)
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49 emit_hex_out(msgtext_gsm7, msgtext_gsmlen, stdout);
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50 else {
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51 putchar('"');
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52 putchar('"');
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53 }
2
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54 putchar('\n');
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55 exit(0);
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56 }
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57 if (!concat_enable) {
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58 fprintf(stderr, "error: message exceeds 160 chars\n");
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59 exit(1);
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60 }
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61 if (!concat_refno_set)
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62 concat_refno = get_concsms_refno_from_host_fs();
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63 puts("dcs 0 septet");
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64 nparts = (msgtext_gsmlen + 152) / 153;
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65 udh[0] = 5;
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66 udh[1] = 0x00;
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67 udh[2] = 0x03;
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68 udh[3] = concat_refno;
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69 udh[4] = nparts;
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70 pos = 0;
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71 remain = msgtext_gsmlen;
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72 for (n = 1; n <= nparts; n++) {
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73 udh[5] = n;
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74 chunk = 153;
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75 if (chunk > remain)
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76 chunk = remain;
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77 fputs("msg-udh ", stdout);
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78 emit_hex_out(udh, 6, stdout);
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79 emit_hex_out(msgtext_gsm7 + pos, chunk, stdout);
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80 putchar('\n');
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81 pos += chunk;
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82 remain -= chunk;
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83 }
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84 exit(0);
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85 }