42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
'use strict';
|
|
|
|
var os = require('os');
|
|
var equals = require('buffer-equal');
|
|
var cr = new Buffer('\r\n');
|
|
var nl = new Buffer('\n');
|
|
|
|
/**
|
|
* Append a buffer to another buffer ensuring to preserve line ending characters.
|
|
*
|
|
* ```js
|
|
* console.log([appendBuffer(new Buffer('abc\r\n'), new Buffer('def')).toString()]);
|
|
* //=> [ 'abc\r\ndef\r\n' ]
|
|
*
|
|
* console.log([appendBuffer(new Buffer('abc\n'), new Buffer('def')).toString()]);
|
|
* //=> [ 'abc\ndef\n' ]
|
|
*
|
|
* // uses os.EOL when a line ending is not found
|
|
* console.log([appendBuffer(new Buffer('abc'), new Buffer('def')).toString()]);
|
|
* //=> [ 'abc\ndef' ]
|
|
* * ```
|
|
* @param {Buffer} `buf` Buffer that will be used to check for an existing line ending. The suffix is appended to this.
|
|
* @param {Buffer} `suffix` Buffer that will be appended to the buf.
|
|
* @return {Buffer} Final Buffer
|
|
* @api public
|
|
*/
|
|
|
|
module.exports = function appendBuffer(buf, suffix) {
|
|
if (!suffix || !suffix.length) {
|
|
return buf;
|
|
}
|
|
var eol;
|
|
if (equals(buf.slice(-2), cr)) {
|
|
eol = cr;
|
|
} else if (equals(buf.slice(-1), nl)) {
|
|
eol = nl;
|
|
} else {
|
|
return Buffer.concat([buf, new Buffer(os.EOL), new Buffer(suffix)]);
|
|
}
|
|
return Buffer.concat([buf, new Buffer(suffix), eol]);
|
|
};
|