cray/epub/stream.js

Epub parser

/**
 * @author: Akshay Singh
 * @date: 12/10/2015
 * @company: Matter Inc
 */
var ZipStream = require('node-stream-zip');
var streamBuffers = require('stream-buffers');
var fs = require('fs-extra');
var path = require('path');

var Streamer = function(streamPath, cb) {
  var streamer = this;
  streamer.path = streamPath;
  var callback = cb || function() {};

  fs.lstat(streamer.path, function(err, stat) {
    streamer.isFile = stat.isFile();
    if (streamer.isFile) {
      streamer.fileStream = new ZipStream({
        file: streamer.path,
        storeEntries: true
      });

      streamer.fileStream.on('error', function(err) {
        callback(err);
      });

      streamer.fileStream.on('ready', function() {
        callback(null)
      });
    } else {
      callback(null);

    }
  });
};

Streamer.prototype.fetchFileString = function(name, cb) {
  var callback = cb || function() {};

  if (this.isFile) {
    this.fileStream.stream(name, function(err, stream) {
      if (err) {
        return callback(err);
      }

      var file = new streamBuffers.WritableStreamBuffer();

      stream.pipe(file).on('finish', function() {
        callback(null, file.getContentsAsString());
      });
    });

  } else {
    fs.readFile(path.resolve(this.path, name), 'utf8', function(err, fileString) {
      if (err) {return callback(err);}

      callback(null, fileString);
    });

  }
};

module.exports = Streamer;