From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Fri, 5 Jun 2020 11:42:41 +0000 (+0000)
Subject: Fixed %TypedArray%.prototype.copyWithin() with nonzero byte offset.
X-Git-Url: http://git.kaiwu.me/postgresql/log/contrib/postgres_fdw/static/gitweb.js?a=commitdiff_plain;h=eabbd1827d1de4c9b4d86c1a33978283e844277e;p=njs.git

Fixed %TypedArray%.prototype.copyWithin() with nonzero byte offset.
---

diff --git a/src/njs_typed_array.c b/src/njs_typed_array.c
index e9ea2c65..1ab8a1be 100644
--- a/src/njs_typed_array.c
+++ b/src/njs_typed_array.c
@@ -803,8 +803,8 @@ njs_typed_array_prototype_copy_within(njs_vm_t *vm, njs_value_t *args,
     buffer = njs_typed_array_buffer(array);
     element_size = njs_typed_array_element_size(array->type);
 
-    to = to * element_size;
-    from = from * element_size;
+    to = (to + array->offset) * element_size;
+    from = (from + array->offset) * element_size;
     count = count * element_size;
 
     memmove(&buffer->u.u8[to], &buffer->u.u8[from], count);
diff --git a/src/test/njs_unit_test.c b/src/test/njs_unit_test.c
index d7ec6ee0..26335448 100644
--- a/src/test/njs_unit_test.c
+++ b/src/test/njs_unit_test.c
@@ -5719,6 +5719,13 @@ static njs_unit_test_t  njs_test[] =
               "           return a.toString() === '1,2,3,3'})"),
       njs_str("true") },
 
+    { njs_str(NJS_TYPED_ARRAY_LIST
+              ".every(v=>{var orig = new v([255,255,1,2,3,4,5]);"
+              "           var a = new v(orig.buffer, 2* v.BYTES_PER_ELEMENT);"
+              "           a.copyWithin(0,3);"
+              "           return a.toString() === '4,5,3,4,5'})"),
+      njs_str("true") },
+
     { njs_str(NJS_TYPED_ARRAY_LIST
               ".every(v=>{var a = new v([]); a.sort(); "
               "           return a.toString() === ''})"),