HORIZON PROJECT

/**

 * An abstraction for slicing an arraybuffer even when

 * ArrayBuffer.prototype.slice is not supported

 *

 * @api public

 */

module.exports = function(arraybuffer, start, end) {

  var bytes = arraybuffer.byteLength;

  start = start || 0;

  end = end || bytes;

  if (arraybuffer.slice) { return arraybuffer.slice(start, end); }

  if (start < 0) { start += bytes; }

  if (end < 0) { end += bytes; }

  if (end > bytes) { end = bytes; }

  if (start >= bytes || start >= end || bytes === 0) {

    return new ArrayBuffer(0);

  }

  var abv = new Uint8Array(arraybuffer);

  var result = new Uint8Array(end - start);

  for (var i = start, ii = 0; i < end; i++, ii++) {

    result[ii] = abv[i];

  }

  return result.buffer;

};