// Copyright (C) 2021 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-arraybuffer.prototype.transfer
description: Transfering from a fixed-size ArrayBuffer into a smaller ArrayBuffer
info: |
ArrayBuffer.prototype.transfer ( [ newLength ] )
1. Let O be the this value.
2. Perform ? RequireInternalSlot(O, [[ArrayBufferData]]).
3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
4. If IsDetachedBuffer(O) is true, throw a TypeError exception.
5. If newLength is undefined, let newByteLength be
O.[[ArrayBufferByteLength]].
6. Else, let newByteLength be ? ToIntegerOrInfinity(newLength).
7. Let new be ? Construct(%ArrayBuffer%, « 𝔽(newByteLength) »).
8. NOTE: This method returns a fixed-length ArrayBuffer.
9. Let copyLength be min(newByteLength, O.[[ArrayBufferByteLength]]).
10. Let fromBlock be O.[[ArrayBufferData]].
11. Let toBlock be new.[[ArrayBufferData]].
12. Perform CopyDataBlockBytes(toBlock, 0, fromBlock, 0, copyLength).
13. NOTE: Neither creation of the new Data Block nor copying from the old
Data Block are observable. Implementations reserve the right to implement
this method as a zero-copy move or a realloc.
14. Perform ! DetachArrayBuffer(O).
15. Return new.
features: [resizable-arraybuffer, arraybuffer-transfer]
---*/
var source = new ArrayBuffer(4);
var sourceArray = new Uint8Array(source);
sourceArray[0] = 1;
sourceArray[1] = 2;
sourceArray[2] = 3;
sourceArray[3] = 4;
var dest = source.transfer(3);
assert.sameValue(source.byteLength, 0, 'source.byteLength');
assert.throws(TypeError, function() {
source.slice();
});
assert.sameValue(dest.resizable, false, 'dest.resizable');
assert.sameValue(dest.byteLength, 3, 'dest.byteLength');
assert.sameValue(dest.maxByteLength, 3, 'dest.maxByteLength');
var destArray = new Uint8Array(dest);
assert.sameValue(destArray[0], 1, 'destArray[0]');
assert.sameValue(destArray[1], 2, 'destArray[1]');
assert.sameValue(destArray[2], 3, 'destArray[2]');