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Grab the first n bytes out of a stream.

npm install --save headerstream

call it with a size n and a callback, callback is called with first n bytes, of stream, rest of date is simply passed through. If there is an error emitted by the stream the callback will be called with that instead of the header.

var HeaderStream = require('headerstream');
var destStream = getDestStream();
var srcStream = getSrcStream();
var headerStream = new HeaderStream(16, function (err, header) {