/** | |
* node-compress-commons | |
* | |
* Copyright (c) 2014 Chris Talkington, contributors. | |
* Licensed under the MIT license. | |
* https://github.com/ctalkington/node-compress-commons/blob/master/LICENSE-MIT | |
*/ | |
var Stream = require('stream').Stream; | |
var PassThrough = require('readable-stream').PassThrough; | |
var util = module.exports = {}; | |
util.isStream = function(source) { | |
return source instanceof Stream; | |
}; | |
util.normalizeInputSource = function(source) { | |
if (source === null) { | |
return new Buffer(0); | |
} else if (typeof source === 'string') { | |
return new Buffer(source); | |
} else if (util.isStream(source) && !source._readableState) { | |
var normalized = new PassThrough(); | |
source.pipe(normalized); | |
return normalized; | |
} | |
return source; | |
}; |