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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 8821ffaa93a5
children
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1 /*
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2 * This C source file has been adapted from TU-Berlin libgsm source
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3 * (src/decode.c), original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #include <stdint.h>
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11 #include "tw_gsmfr.h"
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12 #include "typedef.h"
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13 #include "ed_state.h"
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14 #include "ed_internal.h"
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15
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16 /*
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17 * 4.3 FIXED POINT IMPLEMENTATION OF THE RPE-LTP DECODER
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18 */
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19
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20 static void Postprocessing (
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21 struct gsmfr_0610_state * S,
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22 register word * s)
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23 {
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24 register int k;
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25 register word msr = S->msr;
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26 register longword ltmp; /* for GSM_ADD */
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27 register word tmp;
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28
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29 for (k = 160; k--; s++) {
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30 tmp = GSM_MULT_R( msr, 28180 );
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31 msr = GSM_ADD(*s, tmp); /* Deemphasis */
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32 *s = GSM_ADD(msr, msr) & 0xFFF8; /* Truncation & Upscaling */
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33 }
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34 S->msr = msr;
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35 }
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36
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37 void gsmfr_0610_decode_params(struct gsmfr_0610_state *S,
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38 const struct gsmfr_param_frame *inp, int16_t *s)
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39 {
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40 int j, k;
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41 word erp[40], wt[160];
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42 word * drp = S->dp0 + 120;
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43
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44 for (j=0; j <= 3; j++) {
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45 Gsm_RPE_Decoding(S, inp->xmaxc[j], inp->Mc[j], inp->xMc[j],
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46 erp);
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47 Gsm_Long_Term_Synthesis_Filtering(S, inp->Nc[j], inp->bc[j],
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48 erp, drp);
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49
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50 for (k = 0; k <= 39; k++) wt[ j * 40 + k ] = drp[ k ];
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51 }
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52
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53 Gsm_Short_Term_Synthesis_Filter(S, inp->LARc, wt, s);
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54 Postprocessing(S, s);
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55 }