--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sw/sniff-dec/hl_decode.c	Wed Oct 04 01:18:50 2023 +0000
@@ -0,0 +1,52 @@
+/*
+ * Here we implement higher-level decoding of INS codes and SELECT file IDs.
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+static struct ins_code_tab {
+	u_char	ins_code;
+	char	*cmdname;
+} ins_code_table[] = {
+	{0xA4, "SELECT"},
+	{0xF2, "STATUS"},
+	{0xB0, "READ BINARY"},
+	{0xD6, "UPDATE BINARY"},
+	{0xB2, "READ RECORD"},
+	{0xDC, "UPDATE RECORD"},
+	{0xA2, "SEEK"},
+	{0x32, "INCREASE"},
+	{0x20, "VERIFY PIN"},
+	{0x24, "CHANGE PIN"},
+	{0x26, "DISABLE PIN"},
+	{0x28, "ENABLE PIN"},
+	{0x2C, "UNBLOCK PIN"},
+	{0x04, "INVALIDATE"},
+	{0x44, "REHABILITATE"},
+	{0x88, "RUN GSM ALGO"},
+	{0xFA, "SLEEP"},
+	{0xC0, "GET RESPONSE"},
+	{0x10, "TERMINAL PROFILE"},
+	{0xC2, "ENVELOPE"},
+	{0x12, "FETCH"},
+	{0x14, "TERMINAL RESPONSE"},
+	/* table search terminator */
+	{0,    0}
+};
+
+void
+decode_cmd_opcode(ins)
+	u_char ins;
+{
+	struct ins_code_tab *tp;
+
+	for (tp = ins_code_table; tp->cmdname; tp++)
+		if (tp->ins_code == ins)
+			break;
+	if (tp->cmdname)
+		printf(" Command: %s\n", tp->cmdname);
+}