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