text: // 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.
  
  (function() {
    var internal = mojo.internal;
  
    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);
    }
  
    internal.Buffer = Buffer;
  })();
  