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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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