--- libregex/op_regex.cpp
+++ libregex/op_regex.cpp
@@ -282,15 +282,15 @@
 			string left = line;
 			left_rule.execute(left);
 			if (left == line) {
-				throw bad_regex("invalid input file: " +
-						'"' + line + '"');
+				throw bad_regex("invalid input file: \"" +
+						line + '"');
 			}
 
 			string right = line;
 			right_rule.execute(right);
 			if (right == line) {
-				throw bad_regex("invalid input file: "
-						+ '"' + line + '"');
+				throw bad_regex("invalid input file: \""
+						+ line + '"');
 			}
 
 			regex.add_pattern(left, right);
@@ -301,8 +301,8 @@
 			string var_value = line;
 			var_value_rule.execute(var_value);
 			if (var_value == line) {
-				throw bad_regex("invalid input file: " +
-						'"' + line + '"');
+				throw bad_regex("invalid input file: \"" +
+						line + '"');
 			}
 
 			regex.add_definition(var_name, var_value);
--- utils/opcontrol
+++ utils/opcontrol
@@ -452,11 +452,20 @@
 		return;
 	fi
 
+	kernel_file=$FILE_IMAGE
+	case $(file -L $kernel_file) in
+	  *"gzip compressed"*)
+	    kernel_file=$(mktemp /tmp/opcXXXXXX) || exit 1
+	    trap "rm -f $kernel_file" EXIT
+	    gzip -cd $FILE_IMAGE > $kernel_file
+	    ;;
+	esac
+
 	# start at the start of .text and then continue to the end 
-	range_info=`objdump -h $FILE_IMAGE 2>/dev/null | grep " .text "`
+	range_info=`objdump -h $kernel_file 2>/dev/null | grep " .text "`
 	tmp1=`echo $range_info | awk '{print $4}'`	
 	tmp_length=`echo $range_info | awk  '{print $3}'`
-	tmp2=`objdump -h $FILE_IMAGE --adjust-vma=0x$tmp_length 2>/dev/null | grep " .text " | awk  '{print $4}'`
+	tmp2=`objdump -h $kernel_file --adjust-vma=0x$tmp_length 2>/dev/null | grep " .text " | awk  '{print $4}'`
 
 	if test -z "$tmp1" -o -z "$tmp2"; then
 		echo "The specified file $FILE_IMAGE does not seem to be valid" >&2