blois@google.com
049efc4fe8
This is an update of https://codereview.chromium.org/11968047/ BUG= Review URL: https://codereview.chromium.org//12024002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@17323 260f80e4-7a28-3924-810f-c04153c831b5
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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part of $LIBRARYNAME;
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$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
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$!MEMBERS
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@DomName('ArrayBuffer.slice')
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ArrayBuffer slice(int begin, [int end]) {
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// IE10 supports ArrayBuffers but does not have the slice method.
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if (JS('bool', '!!#.slice', this)) {
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if (?end) {
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return JS('ArrayBuffer', '#.slice(#, #)', this, begin, end);
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}
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return JS('ArrayBuffer', '#.slice(#)', this, begin);
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} else {
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var start = begin;
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// Negative values go from end.
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if (start < 0) {
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start = this.byteLength + start;
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}
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var finish = ?end ? min(end, byteLength) : byteLength;
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if (finish < 0) {
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finish = this.byteLength + finish;
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}
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var length = max(finish - start, 0);
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var clone = new Int8Array(length);
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var source = new Int8Array.fromBuffer(this, start);
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for (var i = 0; i < length; ++i) {
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clone[i] = source[i];
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}
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return clone.buffer;
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}
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}
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}
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