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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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