# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1724612403 0
# Node ID 03a40ac2e931a9bf956175b0c86993673448f360
# Parent  4f0ab833bec0a7aad4309f0c9fcd64d8ebb68ed4
libgsmhr1: implement validation for *.cod frames

diff -r 4f0ab833bec0 -r 03a40ac2e931 libgsmhr1/Makefile
--- a/libgsmhr1/Makefile	Sun Aug 25 18:42:27 2024 +0000
+++ b/libgsmhr1/Makefile	Sun Aug 25 19:00:03 2024 +0000
@@ -1,6 +1,7 @@
 OBJS=	dhf_packed.o dhf_params.o enc_out_order.o mathdp31.o mathhalf.o \
-	pack_frame.o paramval_common.o rtp_in.o rtp_in_direct.o sid_detect.o \
-	sid_reset.o sp_rom.o twts002_in.o twts002_out.o unpack_frame.o
+	pack_frame.o paramval_cod.o paramval_common.o rtp_in.o rtp_in_direct.o \
+	sid_detect.o sid_reset.o sp_rom.o twts002_in.o twts002_out.o \
+	unpack_frame.o
 HDRS=	enc_out_order.h mathdp31.h mathhalf.h namespace.h sp_rom.h tw_gsmhr.h \
 	typedefs.h
 LIB=	libgsmhr1.a
diff -r 4f0ab833bec0 -r 03a40ac2e931 libgsmhr1/paramval_cod.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgsmhr1/paramval_cod.c	Sun Aug 25 19:00:03 2024 +0000
@@ -0,0 +1,19 @@
+/*
+ * The function implemented in this module examines a frame of 20 int16_t words
+ * that corresponds to GSM-HR encoder output format, and checks if the unused
+ * upper bits of each int16_t word are cleared as they should be.
+ * This function should be used when reading from ETSI-format *.cod files,
+ * to guard against reading garbage or wrong endian.
+ */
+
+#include <stdint.h>
+#include "tw_gsmhr.h"
+
+int gsmhr_check_encoder_params(const int16_t *params)
+{
+	if (params[18] & 0xFFFE)
+		return -1;
+	if (params[19] & 0xFFFE)
+		return -1;
+	return gsmhr_check_common_params(params);
+}