partoffile/index.js

Read part of file.

/**
 * Module dependencies.
 */

var fs = require('fs');

 /**
 * Read part of file.
 *
 * @param {String} path
 * @param {Int} start
 * @param {Int} length
 * @param {Function} callback 
 * @api public
 */

module.exports = function(path, start, length, callback) {
	fs.open(path, 'r', function(err, fd) {
		if(err) 
			return callback(err);
		var buffer = new Buffer(length);
		fs.read(fd, buffer, 0, length, start, function(err, bytes, buffer) {
			callback(null, buffer);
		});
	});
}