FreeCalypso > hg > sms-coding-utils

annotate libcoding/gsm7_encode.c @ 30:d7571dc2fecc

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doc: encoder/generator portion is now just one part
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Jun 2024 23:16:04 +0000
parents e56bb9f09ff1
children
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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 #include <ctype.h>
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8
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9 extern u_char gsm7_encode_table[256];
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10
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11 static unsigned
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12 handle_escape(ipp)
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13 u_char **ipp;
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14 {
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15 unsigned c;
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16
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17 c = *(*ipp)++;
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18 if (c >= '0' && c <= '7' && isxdigit(**ipp)) {
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19 c = ((c - '0') << 4) | decode_hex_digit(*(*ipp)++);
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20 return c;
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21 }
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22 switch (c) {
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23 case 'n':
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24 return '\n';
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25 case 'r':
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26 return '\r';
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27 case 'e':
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28 return 0x1B;
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29 case 'E': /* Euro currency symbol */
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30 return 0xE5;
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31 case '"':
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32 case '\\':
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33 c = gsm7_encode_table[c];
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34 return c;
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35 default:
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36 return 0xFF;
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37 }
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38 }
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39
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40 latin1_to_gsm7(inbuf, outbuf, outmax, outlenp, allow_escape)
0
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41 u_char *inbuf, *outbuf;
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42 unsigned outmax, *outlenp;
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43 {
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44 u_char *ip = inbuf, *op = outbuf;
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45 unsigned outcnt = 0, c, n;
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46
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47 while (c = *ip++) {
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48 if (c == '\\' && allow_escape) {
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49 c = handle_escape(&ip);
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50 if (c == 0xFF)
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51 return(-3);
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52 } else {
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53 c = gsm7_encode_table[c];
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54 if (c == 0xFF)
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55 return(-1);
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56 }
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57 if (c & 0x80)
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58 n = 2;
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59 else
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60 n = 1;
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61 if (outcnt + n > outmax)
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62 return(-2);
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63 if (c & 0x80) {
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64 *op++ = 0x1B;
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65 *op++ = c & 0x7F;
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66 } else
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67 *op++ = c;
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68 outcnt += n;
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69 }
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70 *outlenp = outcnt;
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71 return(0);
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72 }