Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | 1x 1x 1x 40x 10x 7x 22x 1x 1x 10x 10x 10x 10x 10x 10x 10x 10x 10x 1x 1x 1x 1x 1x 1x 1x 10x 6x 1x 1x 1x 7x 7x 7x 7x 7x 13x 13x 7x 7x 7x 1x 6x 1x 1x 5x 1x 1x 1x 4x 4x 4x 2x 2x 2x 2x 2x 7x 21x 7x | const { decode } = require('64');
const BufferBuilder = require('buffer-builder');
module.exports = (encoding, body) => {
switch (encoding) {
case 'base64':
return decode(clean(body));
case 'quoted-printable':
return convertQuotedPrintable(body);
case '8bit':
case '7bit':
case 'binary':
return body;
default:
throw new Error(`Unknown encoding ${encoding}body: ${body}`);
}
};
const clean = (body) => {
const buffBuild = new BufferBuilder();
let start = 0;
for (let i = 0; i < body.length; i++) {
for (;i < body.length && body[i] !== CR && body[i] !== LF; i++);
const end = i;
for (;i < body.length && (body[i] === CR || body[i] === LF); i++);
buffBuild.appendBuffer(body.slice(start, end));
start = i;
}
return buffBuild.get();
};
const EQUALS = '='.charCodeAt(0);
const CR = '\r'.charCodeAt(0);
const LF = '\n'.charCodeAt(0);
const D = 'D'.charCodeAt(0);
const THREE = '3'.charCodeAt(0);
const translate = (() => {
let str = 'switch (c) {\n';
for (let i = 0; i <= 9; i++) str += `\tcase ${'0'.charCodeAt(0) + i}: return ${i};\n`;
for (let i = 0xA; i <= 0xF; i++) str += `\tcase ${'A'.charCodeAt(0) + i - 0xA}: return ${i};\n`;
str += 'default: return -1;\n';
str += '};\n';
/* eslint-disable no-new-func */
return Function('c', str);
})();
function convertQuotedPrintable(body) {
const len = body.length;
const decoded = Buffer.alloc(len); // at most this big
let j = 0;
const runTo = len - 3;
for (let i = 0; i < runTo; i++) {
while (i < runTo && (decoded[j++] = body[i++]) !== EQUALS);
if (i >= runTo) break;
// We are dealing with a '=xx' sequence.
const upper = body[i];
const lower = body[++i];
// fast path for =3D
if (upper === THREE && lower === D) {
continue;
}
if (upper === CR && lower === LF) {
j--;
continue;
}
if (upper === LF) {
// windows chrome does invalid encoding with \n and not \r\n
i--;
j--;
continue;
}
const upperTranslated = translate(upper);
const lowerTranslated = translate(lower);
if ((upperTranslated | lowerTranslated) & 128) {
// invalid seq
decoded[j++] = upper;
decoded[j++] = lower;
continue;
}
const shifted = upperTranslated << 4;
decoded[j - 1] = shifted | lowerTranslated;
}
for (let i = runTo; i < len; i++) {
decoded[j++] = body[i];
}
return decoded.slice(0, j);
}
|