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- let inited = false;
- module.exports.loadWasmSync = function () {
- if (inited) {
- return;
- }
- if (initPromise) {
- throw new Error("Asynchronous initialisation already in progress: cannot initialise synchronously");
- }
- const bytes = unbase64(require("./cashu_sdk_js_bg.wasm.js"));
- const mod = new WebAssembly.Module(bytes);
- const instance = new WebAssembly.Instance(mod, imports);
- wasm = instance.exports;
- wasm.__wbindgen_start();
- inited = true;
- };
- let initPromise = null;
- /**
- * Load the WebAssembly module in the background, if it has not already been loaded.
- *
- * Returns a promise which will resolve once the other methods are ready.
- *
- * @returns {Promise<void>}
- */
- module.exports.loadWasmAsync = function () {
- if (inited) {
- return Promise.resolve();
- }
- if (!initPromise) {
- initPromise = Promise.resolve()
- .then(() => require("./cashu_sdk_js_bg.wasm.js"))
- .then((b64) => WebAssembly.instantiate(unbase64(b64), imports))
- .then((result) => {
- wasm = result.instance.exports;
- wasm.__wbindgen_start();
- inited = true;
- });
- }
- return initPromise;
- };
- const b64lookup = new Uint8Array([
- 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,
- 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,
- 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,
- 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
- ]);
- // 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
- function unbase64(sBase64) {
- const sB64Enc = sBase64.replace(/[^A-Za-z0-9+/]/g, "");
- const nInLen = sB64Enc.length;
- const nOutLen = (nInLen * 3 + 1) >> 2;
- const taBytes = new Uint8Array(nOutLen);
- let nMod3;
- let nMod4;
- let nUint24 = 0;
- let nOutIdx = 0;
- for (let nInIdx = 0; nInIdx < nInLen; nInIdx++) {
- nMod4 = nInIdx & 3;
- nUint24 |= b64lookup[sB64Enc.charCodeAt(nInIdx)] << (6 * (3 - nMod4));
- if (nMod4 === 3 || nInLen - nInIdx === 1) {
- nMod3 = 0;
- while (nMod3 < 3 && nOutIdx < nOutLen) {
- taBytes[nOutIdx] = (nUint24 >>> ((16 >>> nMod3) & 24)) & 255;
- nMod3++;
- nOutIdx++;
- }
- nUint24 = 0;
- }
- }
- return taBytes;
- }
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