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node_modules/@noble/ciphers/esm/utils.js

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+/*! noble-ciphers - MIT License (c) 2023 Paul Miller (paulmillr.com) */
+const u8a = (a) => a instanceof Uint8Array;
+// Cast array to different type
+export const u8 = (arr) => new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength);
+export const u16 = (arr) => new Uint16Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 2));
+export const u32 = (arr) => new Uint32Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 4));
+// Cast array to view
+export const createView = (arr) => new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
+// big-endian hardware is rare. Just in case someone still decides to run ciphers:
+// early-throw an error because we don't support BE yet.
+export const isLE = new Uint8Array(new Uint32Array([0x11223344]).buffer)[0] === 0x44;
+if (!isLE)
+    throw new Error('Non little-endian hardware is not supported');
+const hexes = /* @__PURE__ */ Array.from({ length: 256 }, (_, i) => i.toString(16).padStart(2, '0'));
+/**
+ * @example bytesToHex(Uint8Array.from([0xca, 0xfe, 0x01, 0x23])) // 'cafe0123'
+ */
+export function bytesToHex(bytes) {
+    if (!u8a(bytes))
+        throw new Error('Uint8Array expected');
+    // pre-caching improves the speed 6x
+    let hex = '';
+    for (let i = 0; i < bytes.length; i++) {
+        hex += hexes[bytes[i]];
+    }
+    return hex;
+}
+/**
+ * @example hexToBytes('cafe0123') // Uint8Array.from([0xca, 0xfe, 0x01, 0x23])
+ */
+export function hexToBytes(hex) {
+    if (typeof hex !== 'string')
+        throw new Error('hex string expected, got ' + typeof hex);
+    const len = hex.length;
+    if (len % 2)
+        throw new Error('padded hex string expected, got unpadded hex of length ' + len);
+    const array = new Uint8Array(len / 2);
+    for (let i = 0; i < array.length; i++) {
+        const j = i * 2;
+        const hexByte = hex.slice(j, j + 2);
+        const byte = Number.parseInt(hexByte, 16);
+        if (Number.isNaN(byte) || byte < 0)
+            throw new Error('Invalid byte sequence');
+        array[i] = byte;
+    }
+    return array;
+}
+// There is no setImmediate in browser and setTimeout is slow.
+// call of async fn will return Promise, which will be fullfiled only on
+// next scheduler queue processing step and this is exactly what we need.
+export const nextTick = async () => { };
+// Returns control to thread each 'tick' ms to avoid blocking
+export async function asyncLoop(iters, tick, cb) {
+    let ts = Date.now();
+    for (let i = 0; i < iters; i++) {
+        cb(i);
+        // Date.now() is not monotonic, so in case if clock goes backwards we return return control too
+        const diff = Date.now() - ts;
+        if (diff >= 0 && diff < tick)
+            continue;
+        await nextTick();
+        ts += diff;
+    }
+}
+/**
+ * @example utf8ToBytes('abc') // new Uint8Array([97, 98, 99])
+ */
+export function utf8ToBytes(str) {
+    if (typeof str !== 'string')
+        throw new Error(`utf8ToBytes expected string, got ${typeof str}`);
+    return new Uint8Array(new TextEncoder().encode(str)); // https://bugzil.la/1681809
+}
+export function bytesToUtf8(bytes) {
+    return new TextDecoder().decode(bytes);
+}
+/**
+ * Normalizes (non-hex) string or Uint8Array to Uint8Array.
+ * Warning: when Uint8Array is passed, it would NOT get copied.
+ * Keep in mind for future mutable operations.
+ */
+export function toBytes(data) {
+    if (typeof data === 'string')
+        data = utf8ToBytes(data);
+    if (!u8a(data))
+        throw new Error(`expected Uint8Array, got ${typeof data}`);
+    return data;
+}
+/**
+ * Copies several Uint8Arrays into one.
+ */
+export function concatBytes(...arrays) {
+    const r = new Uint8Array(arrays.reduce((sum, a) => sum + a.length, 0));
+    let pad = 0; // walk through each item, ensure they have proper type
+    arrays.forEach((a) => {
+        if (!u8a(a))
+            throw new Error('Uint8Array expected');
+        r.set(a, pad);
+        pad += a.length;
+    });
+    return r;
+}
+// Check if object doens't have custom constructor (like Uint8Array/Array)
+const isPlainObject = (obj) => Object.prototype.toString.call(obj) === '[object Object]' && obj.constructor === Object;
+export function checkOpts(defaults, opts) {
+    if (opts !== undefined && (typeof opts !== 'object' || !isPlainObject(opts)))
+        throw new Error('options must be object or undefined');
+    const merged = Object.assign(defaults, opts);
+    return merged;
+}
+export function ensureBytes(b, len) {
+    if (!(b instanceof Uint8Array))
+        throw new Error('Uint8Array expected');
+    if (typeof len === 'number')
+        if (b.length !== len)
+            throw new Error(`Uint8Array length ${len} expected`);
+}
+// Constant-time equality
+export function equalBytes(a, b) {
+    // Should not happen
+    if (a.length !== b.length)
+        throw new Error('equalBytes: Different size of Uint8Arrays');
+    let isSame = true;
+    for (let i = 0; i < a.length; i++)
+        isSame && (isSame = a[i] === b[i]); // Lets hope JIT won't optimize away.
+    return isSame;
+}
+// For runtime check if class implements interface
+export class Hash {
+}
+// Polyfill for Safari 14
+export function setBigUint64(view, byteOffset, value, isLE) {
+    if (typeof view.setBigUint64 === 'function')
+        return view.setBigUint64(byteOffset, value, isLE);
+    const _32n = BigInt(32);
+    const _u32_max = BigInt(0xffffffff);
+    const wh = Number((value >> _32n) & _u32_max);
+    const wl = Number(value & _u32_max);
+    const h = isLE ? 4 : 0;
+    const l = isLE ? 0 : 4;
+    view.setUint32(byteOffset + h, wh, isLE);
+    view.setUint32(byteOffset + l, wl, isLE);
+}
+//# sourceMappingURL=utils.js.map