mirror of
https://github.com/aljazceru/cdk.git
synced 2025-12-23 15:44:50 +01:00
77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
let inited = false;
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module.exports.loadWasmSync = function () {
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if (inited) {
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return;
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}
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if (initPromise) {
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throw new Error("Asynchronous initialisation already in progress: cannot initialise synchronously");
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}
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const bytes = unbase64(require("./cashu_js_bg.wasm.js"));
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const mod = new WebAssembly.Module(bytes);
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const instance = new WebAssembly.Instance(mod, imports);
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wasm = instance.exports;
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wasm.__wbindgen_start();
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inited = true;
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};
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let initPromise = null;
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/**
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* Load the WebAssembly module in the background, if it has not already been loaded.
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*
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* Returns a promise which will resolve once the other methods are ready.
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*
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* @returns {Promise<void>}
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*/
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module.exports.loadWasmAsync = function () {
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if (inited) {
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return Promise.resolve();
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}
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if (!initPromise) {
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initPromise = Promise.resolve()
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.then(() => require("./cashu_js_bg.wasm.js"))
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.then((b64) => WebAssembly.instantiate(unbase64(b64), imports))
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.then((result) => {
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wasm = result.instance.exports;
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wasm.__wbindgen_start();
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inited = true;
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});
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}
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return initPromise;
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};
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const b64lookup = new Uint8Array([
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 62, 0, 62, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 63, 0, 26, 27, 28, 29, 30, 31, 32,
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33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
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]);
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// base64 decoder, based on the code at https://developer.mozilla.org/en-US/docs/Glossary/Base64#solution_2_%E2%80%93_rewriting_atob_and_btoa_using_typedarrays_and_utf-8
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function unbase64(sBase64) {
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const sB64Enc = sBase64.replace(/[^A-Za-z0-9+/]/g, "");
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const nInLen = sB64Enc.length;
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const nOutLen = (nInLen * 3 + 1) >> 2;
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const taBytes = new Uint8Array(nOutLen);
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let nMod3;
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let nMod4;
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let nUint24 = 0;
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let nOutIdx = 0;
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for (let nInIdx = 0; nInIdx < nInLen; nInIdx++) {
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nMod4 = nInIdx & 3;
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nUint24 |= b64lookup[sB64Enc.charCodeAt(nInIdx)] << (6 * (3 - nMod4));
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if (nMod4 === 3 || nInLen - nInIdx === 1) {
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nMod3 = 0;
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while (nMod3 < 3 && nOutIdx < nOutLen) {
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taBytes[nOutIdx] = (nUint24 >>> ((16 >>> nMod3) & 24)) & 255;
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nMod3++;
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nOutIdx++;
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}
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nUint24 = 0;
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}
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}
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return taBytes;
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}
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