Script to extract images from hex photo recall export file

imageExtractor.js

'use strict';
var fs = require('fs');

var stringHex = fs.createReadStream('./myOutputFile.txt');
var lastIndex = 0;
var imageBuffer = new Buffer('');
var dirname = process.argv[2];

if (!dirname) {
  return console.log('Usage: ./imageExtractor.js <localDirectoryToExportImagesTo>');
}

if (!fs.existsSync('./' + dirname)) {
  fs.mkdirSync('./' + dirname);
}

var rowChunk = '';
var leftOverChunk = '';

stringHex.on('data', function (chunk) {
  stringHex.pause();
  console.log('chunk');

  rowChunk += chunk.toString();
  if (rowChunk.indexOf('\n') === -1) {
    return stringHex.resume();
  }
  else {
    var rows = rowChunk.toString().split('\n');
    leftOverChunk = rows[rows.length - 1];
    rows.pop();
    rows.forEach(function (row) {
      row = row.split('|||');
      if (row.length !== 7) {
        return;
      }
      var filename = row[0];
      var data = row[4];
      console.log('file', filename);
      fs.appendFileSync('./' + dirname + '/img-' + filename + '.jpg', new Buffer(data, 'hex'), {encoding: 'binary'});
    });
    rowChunk = leftOverChunk;
    stringHex.resume();
  }
});

stringHex.on('end', function () {
  var row = rowChunk.split('\n')[0];
  row = row.split('|||');
  if (row.length !== 7) {
    return;
  }
  var filename = row[0];
  var data = row[4];
  fs.appendFileSync('./' + dirname + '/img-' + filename + '.jpg', new Buffer(data, 'hex'), {encoding: 'binary'});
});