--- a/simtool/Makefile	Sun Jan 24 18:03:55 2021 +0000
+++ b/simtool/Makefile	Sun Jan 24 18:18:04 2021 +0000
@@ -2,7 +2,7 @@
 CFLAGS=	-O2 -I/usr/include/PCSC
 PROG=	fc-simtool
 OBJS=	apdu.o atr.o cardconnect.o dispatch.o globals.o hexdump.o main.o \
-	names.o select.o
+	names.o readcmd.o select.o
 
 all:	${PROG}
 

--- a/simtool/dispatch.c	Sun Jan 24 18:03:55 2021 +0000
+++ b/simtool/dispatch.c	Sun Jan 24 18:18:04 2021 +0000
@@ -12,6 +12,7 @@
 #include <winscard.h>
 #include "globals.h"
 
+extern int cmd_readbin();
 extern int cmd_select();
 
 extern int display_sim_resp_in_hex();
@@ -31,6 +32,7 @@
 } cmdtab[] = {
 	{"exit", 0, 0, cmd_exit},
 	{"quit", 0, 0, cmd_exit},
+	{"readbin", 2, 2, cmd_readbin},
 	{"select", 1, 1, cmd_select},
 	{"sim-resp", 0, 0, display_sim_resp_in_hex},
 	{0, 0, 0, 0}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/readcmd.c	Sun Jan 24 18:18:04 2021 +0000
@@ -0,0 +1,47 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pcsclite.h>
+#include <winscard.h>
+#include "globals.h"
+
+cmd_readbin(argc, argv)
+	char **argv;
+{
+	unsigned offset, len;
+	u_char cmd[5];
+	int rc;
+
+	offset = strtoul(argv[1], 0, 0);
+	if (offset > 0xFFFF) {
+		fprintf(stderr, "error: offset argument is out of range\n");
+		return(-1);
+	}
+	len = strtoul(argv[2], 0, 0);
+	if (len < 1 || len > 256) {
+		fprintf(stderr, "error: length argument is out of range\n");
+		return(-1);
+	}
+	/* READ BINARY command APDU */
+	cmd[0] = 0xA0;
+	cmd[1] = 0xB0;
+	cmd[2] = offset >> 8;
+	cmd[3] = offset;
+	cmd[4] = len;
+	rc = apdu_exchange(cmd, 5);
+	if (rc < 0)
+		return(rc);
+	if (sim_resp_sw != 0x9000) {
+		fprintf(stderr, "bad SW response to READ BINARY: %04X\n",
+			sim_resp_sw);
+		return(-1);
+	}
+	if (sim_resp_data_len != len) {
+		fprintf(stderr,
+			"error: READ BINARY returned %u bytes, expected %u\n",
+			sim_resp_data_len, len);
+		return(-1);
+	}
+	display_sim_resp_in_hex();
+	return(0);
+}