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annotate uptools/libcoding/gsm7_decode.c @ 798:ccaa1319740c

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doc/SIM-manipulation article written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 Mar 2021 00:24:34 +0000
parents 978571e23318
children 1c599681fd60
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1 /*
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2 * This library module implements the decoding of GSM7-encoded data
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3 * into ASCII, ISO 8859-1 or UTF-8.
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4 */
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5
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6 #include <sys/types.h>
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7
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8 extern u_short gsm7_decode_table[128];
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9 extern u_short gsm7ext_decode_table[128];
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10
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11 gsm7_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok, errp)
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12 u_char *inbuf, *outbuf;
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13 unsigned inlen, *outlenp, *errp;
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14 {
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15 u_char *inp, *endp, *outp;
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16 unsigned errcnt = 0;
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17 unsigned gsm, uni;
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18
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19 inp = inbuf;
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20 endp = inbuf + inlen;
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21 outp = outbuf;
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22 while (inp < endp) {
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23 gsm = *inp++;
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24 if (gsm == 0x1B && inp < endp)
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25 uni = gsm7ext_decode_table[*inp++];
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26 else
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27 uni = gsm7_decode_table[gsm];
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28 if (uni == '\r') {
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29 *outp++ = '\\';
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30 *outp++ = 'r';
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31 errcnt++;
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32 } else if (uni == '\n') {
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33 if (newline_ok)
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34 *outp++ = '\n';
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35 else {
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36 *outp++ = '\\';
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37 *outp++ = 'n';
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38 errcnt++;
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39 }
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40 } else if (!uni || !is_decoded_char_ok(uni, ascii_ext)) {
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41 *outp++ = '?';
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42 errcnt++;
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43 } else if (ascii_ext == 2)
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44 outp += emit_utf8_char(uni, outp);
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45 else
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46 *outp++ = uni;
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47 }
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48 *outp = '\0';
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49 if (outlenp)
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50 *outlenp = outp - outbuf;
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51 if (errp)
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52 *errp = errcnt;
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53 }