export function encodeBase64(bytes) {
    return encodeBase64_internal(bytes, base64Alphabet, EncodingPadding.Include);
}
export function encodeBase64NoPadding(bytes) {
    return encodeBase64_internal(bytes, base64Alphabet, EncodingPadding.None);
}
export function encodeBase64url(bytes) {
    return encodeBase64_internal(bytes, base64urlAlphabet, EncodingPadding.Include);
}
export function encodeBase64urlNoPadding(bytes) {
    return encodeBase64_internal(bytes, base64urlAlphabet, EncodingPadding.None);
}
function encodeBase64_internal(bytes, alphabet, padding) {
    let result = "";
    for (let i = 0; i < bytes.byteLength; i += 3) {
        let buffer = 0;
        let bufferBitSize = 0;
        for (let j = 0; j < 3 && i + j < bytes.byteLength; j++) {
            buffer = (buffer << 8) | bytes[i + j];
            bufferBitSize += 8;
        }
        for (let j = 0; j < 4; j++) {
            if (bufferBitSize >= 6) {
                result += alphabet[(buffer >> (bufferBitSize - 6)) & 0x3f];
                bufferBitSize -= 6;
            }
            else if (bufferBitSize > 0) {
                result += alphabet[(buffer << (6 - bufferBitSize)) & 0x3f];
                bufferBitSize = 0;
            }
            else if (padding === EncodingPadding.Include) {
                result += "=";
            }
        }
    }
    return result;
}
const base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const base64urlAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
export function decodeBase64(encoded) {
    return decodeBase64_internal(encoded, base64DecodeMap, DecodingPadding.Required);
}
export function decodeBase64IgnorePadding(encoded) {
    return decodeBase64_internal(encoded, base64DecodeMap, DecodingPadding.Ignore);
}
export function decodeBase64url(encoded) {
    return decodeBase64_internal(encoded, base64urlDecodeMap, DecodingPadding.Required);
}
export function decodeBase64urlIgnorePadding(encoded) {
    return decodeBase64_internal(encoded, base64urlDecodeMap, DecodingPadding.Ignore);
}
function decodeBase64_internal(encoded, decodeMap, padding) {
    const result = new Uint8Array(Math.ceil(encoded.length / 4) * 3);
    let totalBytes = 0;
    for (let i = 0; i < encoded.length; i += 4) {
        let chunk = 0;
        let bitsRead = 0;
        for (let j = 0; j < 4; j++) {
            if (padding === DecodingPadding.Required && encoded[i + j] === "=") {
                continue;
            }
            if (padding === DecodingPadding.Ignore &&
                (i + j >= encoded.length || encoded[i + j] === "=")) {
                continue;
            }
            if (j > 0 && encoded[i + j - 1] === "=") {
                throw new Error("Invalid padding");
            }
            if (!(encoded[i + j] in decodeMap)) {
                throw new Error("Invalid character");
            }
            chunk |= decodeMap[encoded[i + j]] << ((3 - j) * 6);
            bitsRead += 6;
        }
        if (bitsRead < 24) {
            let unused;
            if (bitsRead === 12) {
                unused = chunk & 0xffff;
            }
            else if (bitsRead === 18) {
                unused = chunk & 0xff;
            }
            else {
                throw new Error("Invalid padding");
            }
            if (unused !== 0) {
                throw new Error("Invalid padding");
            }
        }
        const byteLength = Math.floor(bitsRead / 8);
        for (let i = 0; i < byteLength; i++) {
            result[totalBytes] = (chunk >> (16 - i * 8)) & 0xff;
            totalBytes++;
        }
    }
    return result.slice(0, totalBytes);
}
var EncodingPadding;
(function (EncodingPadding) {
    EncodingPadding[EncodingPadding["Include"] = 0] = "Include";
    EncodingPadding[EncodingPadding["None"] = 1] = "None";
})(EncodingPadding || (EncodingPadding = {}));
var DecodingPadding;
(function (DecodingPadding) {
    DecodingPadding[DecodingPadding["Required"] = 0] = "Required";
    DecodingPadding[DecodingPadding["Ignore"] = 1] = "Ignore";
})(DecodingPadding || (DecodingPadding = {}));
const base64DecodeMap = {
    "0": 52,
    "1": 53,
    "2": 54,
    "3": 55,
    "4": 56,
    "5": 57,
    "6": 58,
    "7": 59,
    "8": 60,
    "9": 61,
    A: 0,
    B: 1,
    C: 2,
    D: 3,
    E: 4,
    F: 5,
    G: 6,
    H: 7,
    I: 8,
    J: 9,
    K: 10,
    L: 11,
    M: 12,
    N: 13,
    O: 14,
    P: 15,
    Q: 16,
    R: 17,
    S: 18,
    T: 19,
    U: 20,
    V: 21,
    W: 22,
    X: 23,
    Y: 24,
    Z: 25,
    a: 26,
    b: 27,
    c: 28,
    d: 29,
    e: 30,
    f: 31,
    g: 32,
    h: 33,
    i: 34,
    j: 35,
    k: 36,
    l: 37,
    m: 38,
    n: 39,
    o: 40,
    p: 41,
    q: 42,
    r: 43,
    s: 44,
    t: 45,
    u: 46,
    v: 47,
    w: 48,
    x: 49,
    y: 50,
    z: 51,
    "+": 62,
    "/": 63
};
const base64urlDecodeMap = {
    "0": 52,
    "1": 53,
    "2": 54,
    "3": 55,
    "4": 56,
    "5": 57,
    "6": 58,
    "7": 59,
    "8": 60,
    "9": 61,
    A: 0,
    B: 1,
    C: 2,
    D: 3,
    E: 4,
    F: 5,
    G: 6,
    H: 7,
    I: 8,
    J: 9,
    K: 10,
    L: 11,
    M: 12,
    N: 13,
    O: 14,
    P: 15,
    Q: 16,
    R: 17,
    S: 18,
    T: 19,
    U: 20,
    V: 21,
    W: 22,
    X: 23,
    Y: 24,
    Z: 25,
    a: 26,
    b: 27,
    c: 28,
    d: 29,
    e: 30,
    f: 31,
    g: 32,
    h: 33,
    i: 34,
    j: 35,
    k: 36,
    l: 37,
    m: 38,
    n: 39,
    o: 40,
    p: 41,
    q: 42,
    r: 43,
    s: 44,
    t: 45,
    u: 46,
    v: 47,
    w: 48,
    x: 49,
    y: 50,
    z: 51,
    "-": 62,
    _: 63
};