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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | 1x 1x 1x 1x 64x 1x 123x 64x 1x 1x 1x 200x 196x 196x 58x 58x 138x 138x 138x 58x 58x 196x 196x 196x 196x 196x 196x 196x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 3380x 196x 116x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 50x 66x 66x 66x 66x 66x 66x 66x 66x | import {alphabet} from './constants';
export const createFromBase64Bin = (chars: string = alphabet, pad: string = '=') => {
Iif (chars.length !== 64) throw new Error('chars must be 64 characters long');
let max = 0;
for (let i = 0; i < chars.length; i++) max = Math.max(max, chars.charCodeAt(i));
const table: number[] = [];
for (let i = 0; i <= max; i += 1) table[i] = -1;
for (let i = 0; i < chars.length; i++) table[chars.charCodeAt(i)] = i;
const doExpectPadding = pad.length === 1;
const PAD = doExpectPadding ? pad.charCodeAt(0) : 0;
return (view: DataView, offset: number, length: number): Uint8Array => {
if (!length) return new Uint8Array(0);
let padding = 0;
if (length % 4 !== 0) {
padding = 4 - (length % 4);
length += padding;
} else {
const end = offset + length;
const last = end - 1;
if (view.getUint8(last) === PAD) {
padding = 1;
if (length > 1 && view.getUint8(last - 1) === PAD) padding = 2;
}
}
Iif (length % 4 !== 0) throw new Error('Base64 string length must be a multiple of 4');
const mainEnd = offset + length - (padding ? 4 : 0);
const bufferLength = (length >> 2) * 3 - padding;
const buf = new Uint8Array(bufferLength);
let j = 0;
let i = offset;
for (; i < mainEnd; i += 4) {
const word = view.getUint32(i);
const octet0 = word >>> 24;
const octet1 = (word >>> 16) & 0xff;
const octet2 = (word >>> 8) & 0xff;
const octet3 = word & 0xff;
const sextet0 = table[octet0];
const sextet1 = table[octet1];
const sextet2 = table[octet2];
const sextet3 = table[octet3];
Iif (sextet0 < 0 || sextet1 < 0 || sextet2 < 0 || sextet3 < 0) throw new Error('INVALID_BASE64_SEQ');
buf[j] = (sextet0 << 2) | (sextet1 >> 4);
buf[j + 1] = (sextet1 << 4) | (sextet2 >> 2);
buf[j + 2] = (sextet2 << 6) | sextet3;
j += 3;
}
if (!padding) return buf;
if (padding === 1) {
const word = view.getUint16(mainEnd);
const octet0 = word >> 8;
const octet1 = word & 0xff;
const octet2 = view.getUint8(mainEnd + 2);
const sextet0 = table[octet0];
const sextet1 = table[octet1];
const sextet2 = table[octet2];
Iif (sextet0 < 0 || sextet1 < 0 || sextet2 < 0) throw new Error('INVALID_BASE64_SEQ');
buf[j] = (sextet0 << 2) | (sextet1 >> 4);
buf[j + 1] = (sextet1 << 4) | (sextet2 >> 2);
return buf;
}
const word = view.getUint16(mainEnd);
const octet0 = word >> 8;
const octet1 = word & 0xff;
const sextet0 = table[octet0];
const sextet1 = table[octet1];
Iif (sextet0 < 0 || sextet1 < 0) throw new Error('INVALID_BASE64_SEQ');
buf[j] = (sextet0 << 2) | (sextet1 >> 4);
return buf;
};
};
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