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