Initial import

third_party/duktape/duk_hbufobj_misc.c

@@ -0,0 +1,20 @@
+#include "third_party/duktape/duk_internal.h"
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_uint_t duk_hbufobj_clamp_bytelength(duk_hbufobj *h_bufobj, duk_uint_t len) {
+	duk_uint_t buf_size;
+	duk_uint_t buf_avail;
+
+	DUK_ASSERT(h_bufobj != NULL);
+	DUK_ASSERT(h_bufobj->buf != NULL);
+
+	buf_size = (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_bufobj->buf);
+	if (h_bufobj->offset > buf_size) {
+		/* Slice starting point is beyond current length. */
+		return 0;
+	}
+	buf_avail = buf_size - h_bufobj->offset;
+
+	return buf_avail >= len ? len : buf_avail;
+}
+#endif  /* DUK_USE_BUFFEROBJECT_SUPPORT */