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// from https://github.com/jhiesey/to-arraybuffer/blob/6502d9850e70ba7935a7df4ad86b358fc216f9f0/index.js
// MIT License
// Copyright (c) 2016 John Hiesey
import {isBuffer} from 'buffer';
export default 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 (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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