FreeCalypso > hg > sms-coding-utils

comparison libcoding/gsm7_decode.c @ 27:7418ca2e9949

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libcoding: add functions from freecalypso-tools/uptools/libcoding that are needed for sms-pdu-decode & pcm-sms-decode
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Jun 2024 02:29:29 +0000
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26:c8cb05b69118 27:7418ca2e9949
1 /*
2 * This library module implements the decoding of GSM7-encoded data
3 * into ASCII, ISO 8859-1 or UTF-8.
4 */
5
6 #include <sys/types.h>
7 #include <stdio.h>
8
9 extern u_short gsm7_decode_table[128];
10 extern u_short gsm7ext_decode_table[128];
11
12 gsm7_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok)
13 u_char *inbuf, *outbuf;
14 unsigned inlen, *outlenp;
15 {
16 u_char *inp, *endp, *outp;
17 unsigned gsm, uni;
18 int is_ext;
19
20 inp = inbuf;
21 endp = inbuf + inlen;
22 outp = outbuf;
23 while (inp < endp) {
24 gsm = *inp++;
25 if (gsm == 0x1B && inp < endp && *inp != 0x1B && *inp != '\n'
26 && *inp != '\r') {
27 gsm = *inp++;
28 uni = gsm7ext_decode_table[gsm];
29 if (uni == '\\') {
30 *outp++ = '\\';
31 *outp++ = '\\';
32 continue;
33 }
34 if (uni == 0x20AC && ascii_ext < 2) {
35 *outp++ = '\\';
36 *outp++ = 'E';
37 continue;
38 }
39 is_ext = 1;
40 } else {
41 switch (gsm) {
42 case 0x1B:
43 *outp++ = '\\';
44 *outp++ = 'e';
45 continue;
46 case '\n':
47 if (newline_ok)
48 *outp++ = '\n';
49 else {
50 *outp++ = '\\';
51 *outp++ = 'n';
52 }
53 continue;
54 case '\r':
55 *outp++ = '\\';
56 *outp++ = 'r';
57 continue;
58 }
59 uni = gsm7_decode_table[gsm];
60 is_ext = 0;
61 }
62 if (!uni || !is_decoded_char_ok(uni, ascii_ext)) {
63 if (is_ext) {
64 *outp++ = '\\';
65 *outp++ = 'e';
66 }
67 sprintf(outp, "\\%02X", gsm);
68 outp += 3;
69 } else if (ascii_ext == 2)
70 outp += emit_utf8_char(uni, outp);
71 else
72 *outp++ = uni;
73 }
74 *outp = '\0';
75 if (outlenp)
76 *outlenp = outp - outbuf;
77 }