stream

/*
 * File Operations
 */

var fs = require("fs"),
    path = require("path"),
    util = require("util");

exports.read = function(req, res) {
  var fileName = req.params.filename;
  if (fileName) {
    var resourcePath = path.resolve(__dirname, "..", fileName);
    path.exists(resourcePath, function(exists) {
      if (exists) {
        res.header("Content-Type", "image/jpeg");
        return fs.createReadStream(resourcePath).pipe(res);
      } else {
        return res.end();
      }
    });
  }
};
exports.read2 = function(req, res) {
  var fileName = req.params.filename;
  if (fileName) {
    var resourcePath = path.resolve(__dirname, "..", fileName);
    path.exists(resourcePath, function(exists) {
      if (exists) {
        var fileStats = fs.statSync(resourcePath),
            readStream = fs.createReadStream(resourcePath);

        res.header("Content-Type", "image/jpeg");
        res.header("Content-Length", fileStats.size);

        // old style
        readStream.on("data", function(data) {
          res.write(data);
        });
        
        readStream.on("end", function() {
          res.end();
        });
      } else {
        return res.end();
      }
    });
  }
};
exports.read3 = function(req, res) {
  var fileName = req.params.filename;
  if (fileName) {
    var resourcePath = path.resolve(__dirname, "..", fileName);
    path.exists(resourcePath, function(exists) {
      if (exists) {
        var fileStats = fs.statSync(resourcePath),
            readStream = fs.createReadStream(resourcePath);

        res.header("Content-Type", "image/jpeg");
        res.header("Content-Length", fileStats.size);

        // util.pump
        util.pump(readStream, res);

      } else {
        return res.end();
      }
    });
  }
};