FreeCalypso > hg > sms-coding-utils

annotate libcoding/decode_helpers.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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27
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1 /*
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2 * This library module implements the is_decoded_char_ok() and emit_utf8_char()
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3 * functions used by gsm7_to_ascii_or_ext() and ucs2_to_ascii_or_ext().
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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 is_decoded_char_ok(uni, ascii_ext)
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9 unsigned uni;
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10 {
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11 unsigned upper_limit;
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12
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13 /* weed out control chars first */
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14 if (uni < 0x20)
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15 return(0);
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16 if (uni >= 0x7F && uni <= 0x9F)
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17 return(0);
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18 /* see what range our output encoding allows */
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19 switch (ascii_ext) {
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20 case 0:
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21 upper_limit = 0x7F;
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22 break;
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23 case 1:
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24 upper_limit = 0xFF;
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25 break;
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26 case 2:
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27 upper_limit = 0xFFFF;
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28 break;
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29 default:
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30 upper_limit = 0;
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31 }
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32 if (uni <= upper_limit)
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33 return(1);
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34 else
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35 return(0);
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36 }
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37
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38 emit_utf8_char(uni, outp)
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39 unsigned uni;
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40 u_char *outp;
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41 {
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42 if (uni < 0x80) {
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43 *outp = uni;
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44 return(1);
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45 }
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46 if (uni < 0x800) {
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47 outp[0] = 0xC0 | (uni >> 6);
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48 outp[1] = 0x80 | (uni & 0x3F);
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49 return(2);
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50 }
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51 if (uni < 0x10000) {
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52 outp[0] = 0xE0 | (uni >> 12);
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53 outp[1] = 0x80 | ((uni >> 6) & 0x3F);
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54 outp[2] = 0x80 | (uni & 0x3F);
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55 return(3);
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56 }
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57 outp[0] = 0xF0 | (uni >> 18);
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58 outp[1] = 0x80 | ((uni >> 12) & 0x3F);
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59 outp[2] = 0x80 | ((uni >> 6) & 0x3F);
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60 outp[3] = 0x80 | (uni & 0x3F);
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61 return(4);
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62 }