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https://www.npmjs.com/package/byte-base64 - Encode JS Uint8Array, simple array of bytes or native JS string to base64 and back
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| const base64abc = (() => { | |
| let abc = [], | |
| A = "A".charCodeAt(0), | |
| a = "a".charCodeAt(0), | |
| n = "0".charCodeAt(0); | |
| for (let i = 0; i < 26; ++i) { | |
| abc.push(String.fromCharCode(A + i)); | |
| } | |
| for (let i = 0; i < 26; ++i) { | |
| abc.push(String.fromCharCode(a + i)); | |
| } | |
| for (let i = 0; i < 10; ++i) { | |
| abc.push(String.fromCharCode(n + i)); | |
| } | |
| abc.push("+"); | |
| abc.push("/"); | |
| return abc; | |
| })(); | |
| function bytesToBase64(bytes) { | |
| let result = '', i, l = bytes.length; | |
| for (i = 2; i < l; i += 3) { | |
| result += base64abc[bytes[i - 2] >> 2]; | |
| result += base64abc[((bytes[i - 2] & 0x03) << 4) | (bytes[i - 1] >> 4)]; | |
| result += base64abc[((bytes[i - 1] & 0x0F) << 2) | (bytes[i] >> 6)]; | |
| result += base64abc[bytes[i] & 0x3F]; | |
| } | |
| if (i === l + 1) { // 1 octet missing | |
| result += base64abc[bytes[i - 2] >> 2]; | |
| result += base64abc[(bytes[i - 2] & 0x03) << 4]; | |
| result += "=="; | |
| } | |
| if (i === l) { // 2 octets missing | |
| result += base64abc[bytes[i - 2] >> 2]; | |
| result += base64abc[((bytes[i - 2] & 0x03) << 4) | (bytes[i - 1] >> 4)]; | |
| result += base64abc[(bytes[i - 1] & 0x0F) << 2]; | |
| result += "="; | |
| } | |
| return result; | |
| } |
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