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37 lines
759 B
37 lines
759 B
import { createHash } from 'crypto';
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import { readFile } from 'fs-promise';
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/**
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* Computes hashes for the contents of each file given.
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*
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* @param {Array} of {String} full paths
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* @return {Map}
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*/
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export default async function hashes (files) {
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const map = new Map();
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await Promise.all(files.map(async (name) => {
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const data = await readFile(name);
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const h = hash(data);
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const entry = map.get(h);
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if (entry) {
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entry.names.push(name);
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} else {
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map.set(hash(data), { names: [name], data });
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}
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}));
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return map;
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}
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/**
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* Computes a hash for the given buf.
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*
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* @param {Buffer} file data
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* @return {String} hex digest
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*/
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function hash (buf) {
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return createHash('sha1')
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.update(buf)
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.digest('hex');
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}
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