FreeCalypso > hg > gsm-net-reveng

annotate trau-ul-prep/binreader.c @ 57:fe3cdbbc96f9

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d144: new program atrau-parse
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 25 Sep 2024 17:45:29 +0000
parents 4ab8762be333
children
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4ab8762be333 trau-ul-prep: starting with gsmx2tsrc program
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * Here we implement our binfile_read_frame() function.
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3 */
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4
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5 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <stdint.h>
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include "binreader.h"
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Mychaela Falconia <falcon@freecalypso.org>
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8
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9 int binfile_read_frame(FILE *binf, uint8_t *frame)
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Mychaela Falconia <falcon@freecalypso.org>
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10 {
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Mychaela Falconia <falcon@freecalypso.org>
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11 int cc, morelen;
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12
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13 cc = fread(frame, 1, 1, binf);
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Mychaela Falconia <falcon@freecalypso.org>
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14 if (cc != 1)
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Mychaela Falconia <falcon@freecalypso.org>
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15 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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16 if (frame[0] == 0xBF)
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Mychaela Falconia <falcon@freecalypso.org>
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17 morelen = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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18 else if ((frame[0] & 0xF0) == 0xC0)
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Mychaela Falconia <falcon@freecalypso.org>
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19 morelen = 30;
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20 else if ((frame[0] & 0xF0) == 0xD0)
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Mychaela Falconia <falcon@freecalypso.org>
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21 morelen = 32;
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Mychaela Falconia <falcon@freecalypso.org>
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22 else
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23 return -1;
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24 cc = fread(frame+1, 1, morelen, binf);
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25 if (cc == morelen)
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Mychaela Falconia <falcon@freecalypso.org>
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26 return 1;
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27 else
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28 return -2;
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29 }