83 lines
2.0 KiB
TypeScript
83 lines
2.0 KiB
TypeScript
import wasmJson from "../wasm/crc32.wasm.json";
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import {
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type IHasher,
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type IWASMInterface,
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WASMInterface,
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} from "./WASMInterface";
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import lockedCreate from "./lockedCreate";
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import Mutex from "./mutex";
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import type { IDataType } from "./util";
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const mutex = new Mutex();
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let wasmCache: IWASMInterface = null;
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function validatePoly(poly: number) {
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if (!Number.isInteger(poly) || poly < 0 || poly > 0xffffffff) {
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return new Error("Polynomial must be a valid 32-bit long unsigned integer");
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}
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return null;
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}
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/**
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* Calculates CRC-32 hash
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* @param data Input data (string, Buffer or TypedArray)
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* @param polynomial Input polynomial (defaults to 0xedb88320, for CRC32C use 0x82f63b78)
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* @returns Computed hash as a hexadecimal string
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*/
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export function crc32(
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data: IDataType,
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polynomial = 0xedb88320,
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): Promise<string> {
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if (validatePoly(polynomial)) {
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return Promise.reject(validatePoly(polynomial));
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}
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if (wasmCache === null) {
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return lockedCreate(mutex, wasmJson, 4).then((wasm) => {
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wasmCache = wasm;
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return wasmCache.calculate(data, polynomial);
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});
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}
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try {
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const hash = wasmCache.calculate(data, polynomial);
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return Promise.resolve(hash);
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} catch (err) {
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return Promise.reject(err);
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}
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}
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/**
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* Creates a new CRC-32 hash instance
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* @param polynomial Input polynomial (defaults to 0xedb88320, for CRC32C use 0x82f63b78)
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*/
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export function createCRC32(polynomial = 0xedb88320): Promise<IHasher> {
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if (validatePoly(polynomial)) {
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return Promise.reject(validatePoly(polynomial));
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}
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return WASMInterface(wasmJson, 4).then((wasm) => {
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wasm.init(polynomial);
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const obj: IHasher = {
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init: () => {
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wasm.init(polynomial);
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return obj;
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},
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update: (data) => {
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wasm.update(data);
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return obj;
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},
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// biome-ignore lint/suspicious/noExplicitAny: Conflict with IHasher type
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digest: (outputType) => wasm.digest(outputType) as any,
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save: () => wasm.save(),
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load: (data) => {
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wasm.load(data);
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return obj;
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},
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blockSize: 4,
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digestSize: 4,
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};
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return obj;
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});
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}
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