FreeCalypso > hg > sms-coding-utils

annotate libcoding/grokdcs.c @ 27:7418ca2e9949

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libcoding: add functions from freecalypso-tools/uptools/libcoding that are needed for sms-pdu-decode & pcm-sms-decode
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Jun 2024 02:29:29 +0000
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7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This library module implements the function that distills the complex
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
Mychaela Falconia <falcon@freecalypso.org>
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3 * set of possible SMS DCS octet values to just one of 4 possibilities:
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
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4 * 7-bit text (7), 8-bit data octets (8), UCS-2 text (16) or compressed
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
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5 * data (9).
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6 *
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7 * The decoding is based on the 3GPP TS 23.038 V11.0.0 spec;
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
Mychaela Falconia <falcon@freecalypso.org>
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8 * reserved encodings are treated as 7-bit text as the spec instructs.
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
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9 */
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10
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11 sms_dcs_classify(dcs)
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12 {
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13 if (!(dcs & 0x80)) {
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14 if (dcs & 0x20)
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15 return(9);
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16 switch (dcs & 0xC) {
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Mychaela Falconia <falcon@freecalypso.org>
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17 case 0:
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Mychaela Falconia <falcon@freecalypso.org>
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18 return(7);
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Mychaela Falconia <falcon@freecalypso.org>
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19 case 4:
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20 return(8);
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21 case 8:
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22 return(16);
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23 default:
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24 /* reserved, treating as 7-bit per the spec */
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25 return(7);
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26 }
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27 }
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28 switch (dcs & 0xF0) {
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29 case 0x80:
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30 case 0x90:
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31 case 0xA0:
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32 case 0xB0:
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33 /* reserved, treating as 7-bit per the spec */
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34 return(7);
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35 case 0xC0:
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36 case 0xD0:
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37 return(7);
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38 case 0xE0:
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39 return(16);
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40 case 0xF0:
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41 if (dcs & 4)
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42 return(8);
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43 else
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44 return(7);
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45 }
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46 }