FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/gsm7_decode.c @ 839:b053e4141a16

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CHANGES: refer to doc/Audio-mode-config for AEC support changes
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 30 Jul 2021 05:42:21 +0000
parents 30fbaa652ea5
children
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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 #include <stdio.h>
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8
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9 extern u_short gsm7_decode_table[128];
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10 extern u_short gsm7ext_decode_table[128];
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11
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12 gsm7_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok)
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13 u_char *inbuf, *outbuf;
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14 unsigned inlen, *outlenp;
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15 {
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16 u_char *inp, *endp, *outp;
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17 unsigned gsm, uni;
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18 int is_ext;
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19
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20 inp = inbuf;
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21 endp = inbuf + inlen;
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22 outp = outbuf;
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23 while (inp < endp) {
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24 gsm = *inp++;
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25 if (gsm == 0x1B && inp < endp && *inp != 0x1B && *inp != '\n'
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26 && *inp != '\r') {
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27 gsm = *inp++;
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28 uni = gsm7ext_decode_table[gsm];
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29 if (uni == '\\') {
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30 *outp++ = '\\';
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31 *outp++ = '\\';
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32 continue;
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33 }
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34 if (uni == 0x20AC && ascii_ext < 2) {
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35 *outp++ = '\\';
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36 *outp++ = 'E';
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37 continue;
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38 }
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39 is_ext = 1;
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40 } else {
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41 switch (gsm) {
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42 case 0x1B:
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43 *outp++ = '\\';
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44 *outp++ = 'e';
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45 continue;
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46 case '\n':
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47 if (newline_ok)
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48 *outp++ = '\n';
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49 else {
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50 *outp++ = '\\';
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51 *outp++ = 'n';
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52 }
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53 continue;
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54 case '\r':
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55 *outp++ = '\\';
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56 *outp++ = 'r';
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57 continue;
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58 }
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59 uni = gsm7_decode_table[gsm];
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60 is_ext = 0;
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61 }
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62 if (!uni || !is_decoded_char_ok(uni, ascii_ext)) {
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63 if (is_ext) {
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64 *outp++ = '\\';
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65 *outp++ = 'e';
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66 }
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67 sprintf(outp, "\\%02X", gsm);
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68 outp += 3;
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69 } else if (ascii_ext == 2)
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70 outp += emit_utf8_char(uni, outp);
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71 else
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72 *outp++ = uni;
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73 }
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74 *outp = '\0';
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75 if (outlenp)
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76 *outlenp = outp - outbuf;
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77 }