FreeCalypso > hg > sms-coding-utils

annotate libcoding/ucs2_decode.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 7418ca2e9949
children
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1 /*
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2 * This library module implements the conversion of UCS2-encoded data
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3 * (typically received in SMS) into ASCII, ISO 8859-1 or UTF-8,
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4 * maintaining parallelism with the corresponding function for decoding
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5 * GSM7-encoded data.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <stdio.h>
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10
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11 ucs2_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok)
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12 u_char *inbuf, *outbuf;
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13 unsigned inlen, *outlenp;
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14 {
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15 u_char *inp, *endp, *outp;
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16 unsigned uni;
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17
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18 inp = inbuf;
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19 endp = inbuf + (inlen & ~1);
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20 outp = outbuf;
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21 while (inp < endp) {
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22 if ((endp - inp) >= 4 && (inp[0] & 0xFC) == 0xD8 &&
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23 (inp[2] & 0xFC) == 0xDC) {
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24 uni = ((inp[0] & 3) << 18) | (inp[1] << 10) |
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25 ((inp[2] & 3) << 8) | inp[3];
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26 inp += 4;
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27 uni += 0x10000;
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28 if (ascii_ext == 2)
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29 outp += emit_utf8_char(uni, outp);
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30 else {
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31 sprintf(outp, "\\U%06X", uni);
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32 outp += 8;
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33 }
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34 continue;
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35 }
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36 uni = (inp[0] << 8) | inp[1];
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37 inp += 2;
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38 if (uni == '\\') {
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39 *outp++ = '\\';
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40 *outp++ = '\\';
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41 } else if (uni == '\r') {
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42 *outp++ = '\\';
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43 *outp++ = 'r';
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44 } else if (uni == '\n') {
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45 if (newline_ok)
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46 *outp++ = '\n';
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47 else {
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48 *outp++ = '\\';
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49 *outp++ = 'n';
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50 }
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51 } else if (!is_decoded_char_ok(uni, ascii_ext)) {
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52 sprintf(outp, "\\u%04X", uni);
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53 outp += 6;
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54 } else if (ascii_ext == 2)
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55 outp += emit_utf8_char(uni, outp);
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56 else
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57 *outp++ = uni;
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58 }
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59 *outp = '\0';
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60 if (outlenp)
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61 *outlenp = outp - outbuf;
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62 }