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/** * @fileoverview Provides cross-platform encoding utilities. * @module src/utils/internal/encoding */ import { runtimeCaps } from './runtime.js'; /** * Encodes an ArrayBuffer into a base64 string in a cross-platform manner. * Prefers Node.js Buffer for performance if available, otherwise uses a * standard web API fallback. * * @param buffer - The ArrayBuffer to encode. * @returns The base64-encoded string. */ export function arrayBufferToBase64(buffer: ArrayBuffer): string { if (runtimeCaps.hasBuffer) { // Node.js environment return Buffer.from(buffer).toString('base64'); } else { // Browser/Worker environment let binary = ''; const bytes = new Uint8Array(buffer); const len = bytes.byteLength; for (let i = 0; i < len; i++) { binary += String.fromCharCode(bytes[i]!); } return btoa(binary); } }