--- a/simtool/Makefile	Mon Jan 25 01:23:54 2021 +0000
+++ b/simtool/Makefile	Mon Jan 25 01:54:43 2021 +0000
@@ -1,9 +1,9 @@
 CC=	gcc
 CFLAGS=	-O2 -I/usr/include/PCSC
 PROG=	fc-simtool
-OBJS=	apdu.o atr.o cardconnect.o dispatch.o globals.o hexdump.o hlread.o \
-	main.o names.o readcmd.o readops.o saverestore.o select.o telsum.o \
-	writeops.o
+OBJS=	apdu.o atr.o cardconnect.o dispatch.o globals.o hexdump.o hexread.o \
+	hlread.o main.o names.o readcmd.o readops.o saverestore.o select.o \
+	telsum.o writecmd.o writeops.o
 
 all:	${PROG}
 

--- a/simtool/dispatch.c	Mon Jan 25 01:23:54 2021 +0000
+++ b/simtool/dispatch.c	Mon Jan 25 01:54:43 2021 +0000
@@ -21,6 +21,7 @@
 extern int cmd_savebin();
 extern int cmd_select();
 extern int cmd_telecom_sum();
+extern int cmd_update_bin();
 
 extern int display_sim_resp_in_hex();
 
@@ -49,6 +50,7 @@
 	{"select", 1, 1, cmd_select},
 	{"sim-resp", 0, 0, display_sim_resp_in_hex},
 	{"telecom-sum", 0, 0, cmd_telecom_sum},
+	{"update-bin", 2, 2, cmd_update_bin},
 	{0, 0, 0, 0}
 };
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/hexread.c	Mon Jan 25 01:54:43 2021 +0000
@@ -0,0 +1,67 @@
+/*
+ * This module contains the function for reading hex files,
+ * to be used in the implementation of manual write commands.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+decode_hex_digit(c)
+{
+	if (c >= '0' && c <= '9')
+		return(c - '0');
+	if (c >= 'A' && c <= 'F')
+		return(c - 'A' + 10);
+	if (c >= 'a' && c <= 'f')
+		return(c - 'a' + 10);
+	return(-1);
+}
+
+read_hex_data_file(filename, databuf)
+	char *filename;
+	u_char *databuf;
+{
+	FILE *inf;
+	unsigned count;
+	int c, c2;
+
+	inf = fopen(filename, "r");
+	if (!inf) {
+		perror(filename);
+		return(-1);
+	}
+	for (count = 0; ; count++) {
+		do
+			c = getc(inf);
+		while (isspace(c));
+		if (c < 0)
+			break;
+		if (!isxdigit(c)) {
+inv_input:		fprintf(stderr, "%s: invalid hex file input\n",
+				filename);
+			fclose(inf);
+			return(-1);
+		}
+		c2 = getc(inf);
+		if (!isxdigit(c2))
+			goto inv_input;
+		if (count >= 255) {
+			fprintf(stderr, "%s: hex input data is too long\n",
+				filename);
+			fclose(inf);
+			return(-1);
+		}
+		databuf[count] = (decode_hex_digit(c) << 4) |
+				 decode_hex_digit(c2);
+	}
+	fclose(inf);
+	if (!count) {
+		fprintf(stderr, "%s: no hex data input found\n", filename);
+		return(-1);
+	}
+	return(count);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/writecmd.c	Mon Jan 25 01:54:43 2021 +0000
@@ -0,0 +1,25 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pcsclite.h>
+#include <winscard.h>
+#include "globals.h"
+
+cmd_update_bin(argc, argv)
+	char **argv;
+{
+	unsigned offset, len;
+	u_char data[255];
+	int rc;
+
+	offset = strtoul(argv[1], 0, 0);
+	if (offset > 0xFFFF) {
+		fprintf(stderr, "error: offset argument is out of range\n");
+		return(-1);
+	}
+	rc = read_hex_data_file(argv[2], data);
+	if (rc < 0)
+		return(rc);
+	len = rc;
+	return update_bin_op(offset, data, len);
+}