(function() { if (typeof window === 'undefined') return; // Store original functions before overriding var originalBtoa = window.btoa; var originalAtob = window.atob; // Base64 encoding/decoding with UTF-8 support var base64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='; // Custom btoa that handles UTF-8 function utf8Btoa(input) { if (typeof input !== 'string') { input = String(input); } // First try: check if input is pure ASCII (Latin1) var isPureAscii = true; for (var j = 0; j < input.length; j++) { if (input.charCodeAt(j) > 255) { isPureAscii = false; break; } } // If pure ASCII, use original btoa (faster) if (isPureAscii && originalBtoa) { try { return originalBtoa(input); } catch(e) { // Fall through to UTF-8 encoding } } // UTF-8 encode then base64 var utf8Bytes; if (typeof TextEncoder !== 'undefined') { utf8Bytes = new TextEncoder().encode(input); } else { // Fallback for older browsers utf8Bytes = []; for (var i = 0; i < input.length; i++) { var code = input.charCodeAt(i); if (code < 128) { utf8Bytes.push(code); } else if (code < 2048) { utf8Bytes.push(192 | (code >> 6), 128 | (code & 63)); } else if (code < 65536) { utf8Bytes.push(224 | (code >> 12), 128 | ((code >> 6) & 63), 128 | (code & 63)); } else { utf8Bytes.push(240 | (code >> 18), 128 | ((code >> 12) & 63), 128 | ((code >> 6) & 63), 128 | (code & 63)); } } utf8Bytes = new Uint8Array(utf8Bytes); } var output = ''; var i = 0; while (i < utf8Bytes.length) { var byte1 = utf8Bytes[i++] || 0; var byte2 = utf8Bytes[i++]; var byte3 = utf8Bytes[i++]; var enc1 = byte1 >> 2; var enc2 = ((byte1 & 3) << 4) | ((byte2 !== undefined ? byte2 : 0) >> 4); var enc3 = byte2 !== undefined ? (((byte2 & 15) << 2) | ((byte3 !== undefined ? byte3 : 0) >> 6)) : 64; var enc4 = byte3 !== undefined ? (byte3 & 63) : 64; output += base64Chars.charAt(enc1) + base64Chars.charAt(enc2) + base64Chars.charAt(enc3) + base64Chars.charAt(enc4); } return output; } // Custom atob that handles UTF-8 function utf8Atob(input) { if (typeof input !== 'string') { input = String(input); } // Remove whitespace and validate input = input.replace(/[\s]/g, ''); // First try original atob if (originalAtob) { try { return originalAtob(input); } catch(e) { // Fall through to custom decoding } } var bytes = []; var i = 0; while (i < input.length) { var enc1 = base64Chars.indexOf(input.charAt(i++)); var enc2 = base64Chars.indexOf(input.charAt(i++)); var enc3 = base64Chars.indexOf(input.charAt(i++)); var enc4 = base64Chars.indexOf(input.charAt(i++)); if (enc1 === -1 || enc2 === -1) break; var byte1 = (enc1 << 2) | (enc2 >> 4); bytes.push(byte1); if (enc3 !== 64 && enc3 !== -1) { var byte2 = ((enc2 & 15) << 4) | (enc3 >> 2); bytes.push(byte2); } if (enc4 !== 64 && enc4 !== -1) { var byte3 = ((enc3 & 3) << 6) | enc4; bytes.push(byte3); } } // Try to decode as UTF-8 if (typeof TextDecoder !== 'undefined') { try { return new TextDecoder().decode(new Uint8Array(bytes)); } catch(e) { // Fall through to simple decoding } } // Simple byte-to-char fallback var result = ''; for (var k = 0; k < bytes.length; k++) { result += String.fromCharCode(bytes[k]); } return result; } // Replace window.btoa and window.atob window.btoa = utf8Btoa; window.atob = utf8Atob; console.log('[v0] UTF-8 safe btoa/atob polyfill loaded successfully'); })();

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