31 lines
682 B
JavaScript
31 lines
682 B
JavaScript
'use strict'
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var intSize = 4
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var zeroBuffer = new Buffer(intSize)
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zeroBuffer.fill(0)
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var charSize = 8
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var hashSize = 16
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function toArray (buf) {
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if ((buf.length % intSize) !== 0) {
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var len = buf.length + (intSize - (buf.length % intSize))
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buf = Buffer.concat([buf, zeroBuffer], len)
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}
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var arr = new Array(buf.length >>> 2)
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for (var i = 0, j = 0; i < buf.length; i += intSize, j++) {
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arr[j] = buf.readInt32LE(i)
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}
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return arr
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}
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module.exports = function hash (buf, fn) {
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var arr = fn(toArray(buf), buf.length * charSize)
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buf = new Buffer(hashSize)
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for (var i = 0; i < arr.length; i++) {
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buf.writeInt32LE(arr[i], i << 2, true)
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}
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return buf
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}
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