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						 | 
						- var Buffer = require('buffer').Buffer
 - 
 - module.exports = function (buf) {
 - 	// If the buffer is backed by a Uint8Array, a faster version will work
 - 	if (buf instanceof Uint8Array) {
 - 		// If the buffer isn't a subarray, return the underlying ArrayBuffer
 - 		if (buf.byteOffset === 0 && buf.byteLength === buf.buffer.byteLength) {
 - 			return buf.buffer
 - 		} else if (typeof buf.buffer.slice === 'function') {
 - 			// Otherwise we need to get a proper copy
 - 			return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)
 - 		}
 - 	}
 - 
 - 	if (Buffer.isBuffer(buf)) {
 - 		// This is the slow version that will work with any Buffer
 - 		// implementation (even in old browsers)
 - 		var arrayCopy = new Uint8Array(buf.length)
 - 		var len = buf.length
 - 		for (var i = 0; i < len; i++) {
 - 			arrayCopy[i] = buf[i]
 - 		}
 - 		return arrayCopy.buffer
 - 	} else {
 - 		throw new Error('Argument must be a Buffer')
 - 	}
 - }
 
 
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