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