+
−/*
+
− * The function in this module implements detection of perfect, error-free
+
− * HRv1 SID frames in TS 101 318 raw packed format.  If SID is detected,
+
− * the return value is 2: the code for valid SID per GSM 06.41.
+
− */
+
−
+
−#include <stdint.h>
+
−#include <string.h>
+
−#include "tw_gsmhr.h"
+
−
+
−int gsmhr_ts101318_is_perfect_sid(const uint8_t *payload)
+
−{
+
−	static const uint8_t all_ff_bytes[9] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+
−						0xFF, 0xFF, 0xFF, 0xFF};
+
−
+
−	if ((payload[4] & 0x7F) != 0x7F)
+
−		return 0;
+
−	if (memcmp(payload + 5, all_ff_bytes, 9) == 0)
+
−		return 2;
+
−	else
+
−		return 0;
+
−}