var binaryFeatures = {};
binaryFeatures.useBlobBuilder = (function () {
  try {
    new Blob([]);
    return false;
  } catch (e) {
    return true;
  }
})();

binaryFeatures.useArrayBufferView = !binaryFeatures.useBlobBuilder && (function () {
  try {
    return (new Blob([new Uint8Array([])])).size === 0;
  } catch (e) {
    return true;
  }
})();

module.exports.binaryFeatures = binaryFeatures;
var BlobBuilder = module.exports.BlobBuilder;
if (typeof window !== 'undefined') {
  BlobBuilder = module.exports.BlobBuilder = window.WebKitBlobBuilder ||
    window.MozBlobBuilder || window.MSBlobBuilder || window.BlobBuilder;
}

function BufferBuilder () {
  this._pieces = [];
  this._parts = [];
}

BufferBuilder.prototype.append = function (data) {
  if (typeof data === 'number') {
    this._pieces.push(data);
  } else {
    this.flush();
    this._parts.push(data);
  }
};

BufferBuilder.prototype.flush = function () {
  if (this._pieces.length > 0) {
    var buf = new Uint8Array(this._pieces);
    if (!binaryFeatures.useArrayBufferView) {
      buf = buf.buffer;
    }
    this._parts.push(buf);
    this._pieces = [];
  }
};

BufferBuilder.prototype.getBuffer = function () {
  this.flush();
  if (binaryFeatures.useBlobBuilder) {
    var builder = new BlobBuilder();
    for (var i = 0, ii = this._parts.length; i < ii; i++) {
      builder.append(this._parts[i]);
    }
    return builder.getBlob();
  } else {
    return new Blob(this._parts);
  }
};

module.exports.BufferBuilder = BufferBuilder;