+static VALUE
+chunk_init (VALUE self, VALUE tag, VALUE data)
+{
+ unsigned long len;
+
+ StringValue (tag);
+ StringValue (data);
+
+ if (rb_funcall (tag, id_include, 1, INT2FIX (0)) == Qtrue) \
+ rb_raise (rb_eArgError, "tag must not contain binary zeroes");
+
+ /* libeet uses a signed 32bit integer to store the
+ * chunk size, so make sure we don't overflow it
+ */
+ len = RSTRING (tag)->len + 1 + RSTRING (data)->len;
+ if (len < 0 || len >= 2147483647L)
+ rb_raise (rb_eArgError, "tag or data too long");
+
+ rb_ivar_set (self, id_tag, rb_str_dup_frozen (tag));
+ rb_ivar_set (self, id_data, rb_str_dup_frozen (data));
+
+ return self;
+}
+