@@ -49,23 +49,30 @@
 		_types = [self allocMemoryWithSize: length + 1];
 		memcpy(_types, types, length);
 
 		_typesPointers = [[OFMutableData alloc]
 		    initWithItemSize: sizeof(char *)];
+		_offsets = [[OFMutableData alloc]
+		    initWithItemSize: sizeof(size_t)];
 
 		last = _types;
 		for (size_t i = 0; i < length; i++) {
 			if (isdigit(_types[i])) {
+				size_t offset = _types[i] - '0';
+
 				if (last == _types + i)
 					@throw [OFInvalidFormatException
 					    exception];
 
 				_types[i] = '\0';
 				[_typesPointers addItem: &last];
 
 				i++;
-				for (; i < length && isdigit(_types[i]); i++);
+				for (; i < length && isdigit(_types[i]); i++)
+					offset = offset * 10 + _types[i] - '0';
+
+				[_offsets addItem: &offset];
 
 				last = _types + i;
 				i--;
 			} else if (_types[i] == '{') {
 				size_t depth = 0;
@@ -111,10 +118,11 @@
 }
 
 - (void)dealloc
 {
 	[_typesPointers release];
+	[_offsets release];
 
 	[super dealloc];
 }
 
 - (size_t)numberOfArguments
@@ -124,11 +132,21 @@
 
 - (const char *)methodReturnType
 {
 	return *(const char **)[_typesPointers firstItem];
 }
+
+- (size_t)frameLength
+{
+	return *(size_t *)[_offsets firstItem];
+}
 
 - (const char *)argumentTypeAtIndex: (size_t)index
 {
 	return *(const char **)[_typesPointers itemAtIndex: index + 1];
 }
+
+- (size_t)argumentOffsetAtIndex: (size_t)index
+{
+	return *(size_t *)[_offsets itemAtIndex: index + 1];
+}
 @end