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55 lines
1.2 KiB
55 lines
1.2 KiB
// @flow
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const xxhash = require('xxhash-wasm');
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let h64, h64Raw;
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module.exports.init = (xxhash().then(xxh => {
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({h64, h64Raw} = xxh);
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}) /*: Promise<void> */);
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const encoder = new TextEncoder();
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function hashString(s /*: string */) /*: string */ {
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return h64(s);
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}
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module.exports.hashString = hashString;
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function hashBuffer(b /*: Uint8Array */) /*: string */ {
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return toHex(h64Raw(b));
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}
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module.exports.hashBuffer = hashBuffer;
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class Hash {
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/*:: data: Array<Uint8Array>; */
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constructor() {
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this.data = [];
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}
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writeString(s /*: string */) {
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this.data.push(encoder.encode(s));
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}
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writeBuffer(b /*: Uint8Array */) {
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this.data.push(b);
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}
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finish() /*: string */ {
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return hashBuffer(concatUint8Arrays(this.data));
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}
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}
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module.exports.Hash = Hash;
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function concatUint8Arrays(arrays) {
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let totalLength = 0;
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for (let a of arrays) {
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totalLength += a.byteLength;
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}
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let result = new Uint8Array(totalLength);
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let offset = 0;
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for (let a of arrays) {
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result.set(a, offset);
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offset += a.byteLength;
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}
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return result;
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}
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function toHex(arr) {
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let dataView = new DataView(arr.buffer);
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return (
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dataView.getUint32(0, true).toString(16) +
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dataView.getUint32(4, true).toString(16)
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);
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}
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