Index: mojo/public/js/bindings/buffer.js |
diff --git a/mojo/public/js/bindings/buffer.js b/mojo/public/js/bindings/buffer.js |
new file mode 100644 |
index 0000000000000000000000000000000000000000..d74fef6c7d9d59eec8338fe2741ad9ccc21c5525 |
--- /dev/null |
+++ b/mojo/public/js/bindings/buffer.js |
@@ -0,0 +1,156 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+define("mojo/public/js/bindings/buffer", function() { |
+ |
+ var kHostIsLittleEndian = (function () { |
+ var endianArrayBuffer = new ArrayBuffer(2); |
+ var endianUint8Array = new Uint8Array(endianArrayBuffer); |
+ var endianUint16Array = new Uint16Array(endianArrayBuffer); |
+ endianUint16Array[0] = 1; |
+ return endianUint8Array[0] == 1; |
+ })(); |
+ |
+ var kHighWordMultiplier = 0x100000000; |
+ |
+ function Buffer(sizeOrArrayBuffer) { |
+ if (sizeOrArrayBuffer instanceof ArrayBuffer) |
+ this.arrayBuffer = sizeOrArrayBuffer; |
+ else |
+ this.arrayBuffer = new ArrayBuffer(sizeOrArrayBuffer); |
+ |
+ this.dataView = new DataView(this.arrayBuffer); |
+ this.next = 0; |
+ } |
+ |
+ Object.defineProperty(Buffer.prototype, "byteLength", { |
+ get: function() { return this.arrayBuffer.byteLength; } |
+ }); |
+ |
+ Buffer.prototype.alloc = function(size) { |
+ var pointer = this.next; |
+ this.next += size; |
+ if (this.next > this.byteLength) { |
+ var newSize = (1.5 * (this.byteLength + size)) | 0; |
+ this.grow(newSize); |
+ } |
+ return pointer; |
+ }; |
+ |
+ function copyArrayBuffer(dstArrayBuffer, srcArrayBuffer) { |
+ (new Uint8Array(dstArrayBuffer)).set(new Uint8Array(srcArrayBuffer)); |
+ } |
+ |
+ Buffer.prototype.grow = function(size) { |
+ var newArrayBuffer = new ArrayBuffer(size); |
+ copyArrayBuffer(newArrayBuffer, this.arrayBuffer); |
+ this.arrayBuffer = newArrayBuffer; |
+ this.dataView = new DataView(this.arrayBuffer); |
+ }; |
+ |
+ Buffer.prototype.trim = function() { |
+ this.arrayBuffer = this.arrayBuffer.slice(0, this.next); |
+ this.dataView = new DataView(this.arrayBuffer); |
+ }; |
+ |
+ Buffer.prototype.getUint8 = function(offset) { |
+ return this.dataView.getUint8(offset); |
+ } |
+ Buffer.prototype.getUint16 = function(offset) { |
+ return this.dataView.getUint16(offset, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.getUint32 = function(offset) { |
+ return this.dataView.getUint32(offset, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.getUint64 = function(offset) { |
+ var lo, hi; |
+ if (kHostIsLittleEndian) { |
+ lo = this.dataView.getUint32(offset, kHostIsLittleEndian); |
+ hi = this.dataView.getUint32(offset + 4, kHostIsLittleEndian); |
+ } else { |
+ hi = this.dataView.getUint32(offset, kHostIsLittleEndian); |
+ lo = this.dataView.getUint32(offset + 4, kHostIsLittleEndian); |
+ } |
+ return lo + hi * kHighWordMultiplier; |
+ } |
+ |
+ Buffer.prototype.getInt8 = function(offset) { |
+ return this.dataView.getInt8(offset); |
+ } |
+ Buffer.prototype.getInt16 = function(offset) { |
+ return this.dataView.getInt16(offset, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.getInt32 = function(offset) { |
+ return this.dataView.getInt32(offset, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.getInt64 = function(offset) { |
+ var lo, hi; |
+ if (kHostIsLittleEndian) { |
+ lo = this.dataView.getUint32(offset, kHostIsLittleEndian); |
+ hi = this.dataView.getInt32(offset + 4, kHostIsLittleEndian); |
+ } else { |
+ hi = this.dataView.getInt32(offset, kHostIsLittleEndian); |
+ lo = this.dataView.getUint32(offset + 4, kHostIsLittleEndian); |
+ } |
+ return lo + hi * kHighWordMultiplier; |
+ } |
+ |
+ Buffer.prototype.getFloat32 = function(offset) { |
+ return this.dataView.getFloat32(offset, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.getFloat64 = function(offset) { |
+ return this.dataView.getFloat64(offset, kHostIsLittleEndian); |
+ } |
+ |
+ Buffer.prototype.setUint8 = function(offset, value) { |
+ this.dataView.setUint8(offset, value); |
+ } |
+ Buffer.prototype.setUint16 = function(offset, value) { |
+ this.dataView.setUint16(offset, value, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.setUint32 = function(offset, value) { |
+ this.dataView.setUint32(offset, value, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.setUint64 = function(offset, value) { |
+ var hi = (value / kHighWordMultiplier) | 0; |
+ if (kHostIsLittleEndian) { |
+ this.dataView.setInt32(offset, value, kHostIsLittleEndian); |
+ this.dataView.setInt32(offset + 4, hi, kHostIsLittleEndian); |
+ } else { |
+ this.dataView.setInt32(offset, hi, kHostIsLittleEndian); |
+ this.dataView.setInt32(offset + 4, value, kHostIsLittleEndian); |
+ } |
+ } |
+ |
+ Buffer.prototype.setInt8 = function(offset, value) { |
+ this.dataView.setInt8(offset, value); |
+ } |
+ Buffer.prototype.setInt16 = function(offset, value) { |
+ this.dataView.setInt16(offset, value, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.setInt32 = function(offset, value) { |
+ this.dataView.setInt32(offset, value, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.setInt64 = function(offset, value) { |
+ var hi = Math.floor(value / kHighWordMultiplier); |
+ if (kHostIsLittleEndian) { |
+ this.dataView.setInt32(offset, value, kHostIsLittleEndian); |
+ this.dataView.setInt32(offset + 4, hi, kHostIsLittleEndian); |
+ } else { |
+ this.dataView.setInt32(offset, hi, kHostIsLittleEndian); |
+ this.dataView.setInt32(offset + 4, value, kHostIsLittleEndian); |
+ } |
+ } |
+ |
+ Buffer.prototype.setFloat32 = function(offset, value) { |
+ this.dataView.setFloat32(offset, value, kHostIsLittleEndian); |
+ } |
+ Buffer.prototype.setFloat64 = function(offset, value) { |
+ this.dataView.setFloat64(offset, value, kHostIsLittleEndian); |
+ } |
+ |
+ var exports = {}; |
+ exports.Buffer = Buffer; |
+ return exports; |
+}); |