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annotate uptools/libcoding/gsm7_encode.c @ 947:1f2459a776d7

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doc/TCH-bit-access: point to gsm-codec-lib release tarball URL
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 06 Jun 2023 04:37:54 +0000
parents 061f8d75083d
children ec7e23d5151f
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dbeb4a5628f5 uptools/libcoding: implemented 8859-1 -> GSM7 encoding function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This library module implements the function for encoding from ISO 8859-1
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3 * into the GSM 7-bit default alphabet (03.38 or 23.038).
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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_char gsm7_encode_table[256];
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9
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10 latin1_to_gsm7(inbuf, outbuf, outmax, outlenp)
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11 u_char *inbuf, *outbuf;
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12 unsigned outmax, *outlenp;
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13 {
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14 u_char *ip = inbuf, *op = outbuf;
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15 unsigned outcnt = 0, c, n;
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16
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17 while (c = *ip++) {
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18 c = gsm7_encode_table[c];
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19 if (c == 0xFF)
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20 return(-1);
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21 if (c & 0x80)
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22 n = 2;
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23 else
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24 n = 1;
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25 if (outcnt + n > outmax)
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26 return(-2);
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27 if (c & 0x80) {
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28 *op++ = 0x1B;
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29 *op++ = c & 0x7F;
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30 } else
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31 *op++ = c;
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061f8d75083d uptools/libcoding/gsm7_encode.c: bug found on review
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32 outcnt += n;
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33 }
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34 *outlenp = outcnt;
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35 return(0);
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36 }