/*
 * In this module we implement the utility function for reading ETSI
 * GSM-HR *.dec files in either LE or BE format.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "../libgsmhr1/tw_gsmhr.h"

read_dec_frame(inf, big_endian, params, filename_for_errs, frame_no)
	FILE *inf;
	int16_t *params;
	char *filename_for_errs;
	unsigned frame_no;
{
	uint8_t file_bytes[GSMHR_NUM_PARAMS_DEC * 2], *sp;
	int cc;
	unsigned n;
	uint16_t val;

	cc = fread(file_bytes, 2, GSMHR_NUM_PARAMS_DEC, inf);
	if (cc == 0)
		return 0;
	if (cc != GSMHR_NUM_PARAMS_DEC) {
		fprintf(stderr, "error: short read from %s\n",
			filename_for_errs);
		exit(1);
	}
	sp = file_bytes;
	for (n = 0; n < GSMHR_NUM_PARAMS_DEC; n++) {
		if (big_endian)
			val = ((uint16_t) sp[0] << 8) | ((uint16_t) sp[1]);
		else
			val = ((uint16_t) sp[1] << 8) | ((uint16_t) sp[0]);
		params[n] = val;
		sp += 2;
	}
	if (gsmhr_check_decoder_params(params) < 0) {
		fprintf(stderr,
			"error in %s frame #%u: wrong format or wrong endian\n",
			filename_for_errs, frame_no);
		exit(1);
	}
	return 1;
}