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// 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/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;
});
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