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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 194x 194x 66x 66x 128x 128x 128x 66x 66x 194x 194x 194x 194x 194x 194x 194x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 3054x 194x 132x 60x 60x 60x 60x 60x 60x 60x 60x 60x 60x 60x 72x 72x 72x 72x 72x 72x 72x 72x | 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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