Merge branch 'add-bufferobject-cast-test'

tests/ecmascript/test-bug-bufferobject-cast-gh336.js

@@ -0,0 +1,47 @@
+/*
+ *  Demonstrate double-to-integer casting issues present on some (broken)
+ *  exotic ARM platforms.  This is not a Duktape bug as such, because the
+ *  underlying cause is broken double casts.  For example:
+ *
+ *    double d = (double) 0xdeadbeefUL;
+ *    unsigned int i = (unsigned int) d;
+ *
+ *  Instead of the above 'i' being 0xdeadbeefUL, 'i' becomes 0x7fffffffUL
+ *  on this particular platform.  This also shows up in the test below.
+ *
+ *  This testcase demonstrates the issue if present, so that it's possible
+ *  to see if it has been fixed.
+ *
+ *  https://github.com/svaarala/duktape/issues/336
+ */
+
+/*---
+{
+    "custom": true
+}
+---*/
+
+/*===
+|414243deadbeef48|
+|4142437fedcba948|
+===*/
+
+function test() {
+    var b;
+
+    // Here 0xdeadbeef incorrectly casts to 0x7fffffff on the exotic target.
+    b = new Buffer('ABCDEFGH');
+    b.writeUInt32BE(0xdeadbeef, 3);
+    print(Duktape.enc('jx', Duktape.Buffer(b)));
+
+    // But 0x7fedcba9 works correctly.
+    b = new Buffer('ABCDEFGH');
+    b.writeUInt32BE(0x7fedcba9, 3);
+    print(Duktape.enc('jx', Duktape.Buffer(b)));
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}