@siteed/expo-audio-studio
Version:
Comprehensive audio processing library for React Native and Expo with recording, analysis, visualization, and streaming capabilities across iOS, Android, and web
52 lines • 1.85 kB
JavaScript
;
// Bundler (Metro/Webpack) will automatically resolve to crc32.web.ts or crc32.native.ts.
Object.defineProperty(exports, "__esModule", { value: true });
const react_native_1 = require("react-native");
// --- Web CRC32 Calculation Logic ---
let webCrcTable;
function computeWebCrc32(data) {
// Lazily compute the table only on web when first needed
if (!webCrcTable) {
webCrcTable = (() => {
const table = new Uint32Array(256);
for (let i = 0; i < 256; ++i) {
let crc = i;
for (let j = 0; j < 8; ++j) {
crc = crc & 1 ? (crc >>> 1) ^ 0xedb88320 : crc >>> 1;
}
table[i] = crc;
}
return table;
})();
}
let crc = -1; // Initialize with 0xFFFFFFFF
if (typeof data === 'string') {
const strBytes = new TextEncoder().encode(data);
for (let i = 0; i < strBytes.length; ++i) {
crc = (crc >>> 8) ^ webCrcTable[(crc ^ strBytes[i]) & 0xff];
}
}
else if (data instanceof Uint8Array) {
for (let i = 0; i < data.length; ++i) {
crc = (crc >>> 8) ^ webCrcTable[(crc ^ data[i]) & 0xff];
}
}
else {
throw new Error('Unsupported data type for CRC32 calculation.');
}
return (crc ^ -1) >>> 0; // Final XOR and ensure unsigned 32-bit
}
// --- End Web CRC32 Calculation Logic ---
let crc32Implementation;
if (react_native_1.Platform.OS === 'web') {
// Assign the web implementation
crc32Implementation = Object.assign(computeWebCrc32, {
buf: (data) => computeWebCrc32(data),
});
}
else {
// No-op implementation for native platforms
crc32Implementation = Object.assign(() => 0, { buf: () => 0 });
}
exports.default = crc32Implementation;
//# sourceMappingURL=crc32.js.map