le-windows.js•1.29 kB
'use strict';
const stream = require('stream');
const Transform = stream.Transform;
/**
* Ensures that only <CR><LF> sequences are used for linebreaks
*
* @param {Object} options Stream options
*/
class LeWindows extends Transform {
constructor(options) {
super(options);
// init Transform
this.options = options || {};
this.lastByte = false;
}
/**
* Escapes dots
*/
_transform(chunk, encoding, done) {
let buf;
let lastPos = 0;
for (let i = 0, len = chunk.length; i < len; i++) {
if (chunk[i] === 0x0a) {
// \n
if ((i && chunk[i - 1] !== 0x0d) || (!i && this.lastByte !== 0x0d)) {
if (i > lastPos) {
buf = chunk.slice(lastPos, i);
this.push(buf);
}
this.push(Buffer.from('\r\n'));
lastPos = i + 1;
}
}
}
if (lastPos && lastPos < chunk.length) {
buf = chunk.slice(lastPos);
this.push(buf);
} else if (!lastPos) {
this.push(chunk);
}
this.lastByte = chunk[chunk.length - 1];
done();
}
}
module.exports = LeWindows;