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comparison uptools/libcoding/gsm7_decode.c @ 328:978571e23318

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uptools started with libcoding
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 03 Feb 2018 20:07:05 +0000
parents
children 1c599681fd60
comparison
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327:973d885a68a0 328:978571e23318
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
8 extern u_short gsm7_decode_table[128];
9 extern u_short gsm7ext_decode_table[128];
10
11 gsm7_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok, errp)
12 u_char *inbuf, *outbuf;
13 unsigned inlen, *outlenp, *errp;
14 {
15 u_char *inp, *endp, *outp;
16 unsigned errcnt = 0;
17 unsigned gsm, uni;
18
19 inp = inbuf;
20 endp = inbuf + inlen;
21 outp = outbuf;
22 while (inp < endp) {
23 gsm = *inp++;
24 if (gsm == 0x1B && inp < endp)
25 uni = gsm7ext_decode_table[*inp++];
26 else
27 uni = gsm7_decode_table[gsm];
28 if (uni == '\r') {
29 *outp++ = '\\';
30 *outp++ = 'r';
31 errcnt++;
32 } else if (uni == '\n') {
33 if (newline_ok)
34 *outp++ = '\n';
35 else {
36 *outp++ = '\\';
37 *outp++ = 'n';
38 errcnt++;
39 }
40 } else if (!uni || !is_decoded_char_ok(uni, ascii_ext)) {
41 *outp++ = '?';
42 errcnt++;
43 } else if (ascii_ext == 2)
44 outp += emit_utf8_char(uni, outp);
45 else
46 *outp++ = uni;
47 }
48 *outp = '\0';
49 if (outlenp)
50 *outlenp = outp - outbuf;
51 if (errp)
52 *errp = errcnt;
53 }