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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 200x 200x 59x 59x 141x 141x 141x 59x 59x 200x 200x 200x 200x 200x 200x 200x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 3648x 200x 118x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 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 => {
Iif (!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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