title: qcar-resource.dat file format of QCAR(Vuforia) SDK
body: <p>My question is simple, that is, given two qcar-resource.dat files, how to combine them into one. 
  We all know that, there is an library called libQCAR.so. However, it is ARMed-instruction set and there is no debugger like ollydbg to debug it. So I can only start analyzing with the dat file.</p>
  
  <p>By checking the file head, I see this dat file is a zip. Unzip it, we can get at least 5 files, as below:chips.kpts,chips.tex.jpg,config.feat,config.info,config.src</p>
  
  <p>No matter how many images a dat file caontains, there is only a config.feat, a confing.info and confing.src. So my question will focus on how to combine each dat's config files into one.</p>
  
  <p>confg.info is simple, because it is an xml.</p>
  
  <p>So is config.feat. Its format is as below:
  <a href="http://filebeam.com/7dde984e385e8e8e3a08ddd4ebd15d95.jpg" rel="nofollow">format1</a></p>
  
  <p>this file has 3 parts, head, body, tail. When combining, the head becomes two head's combination, so is the body. You can check it yourself with this format I give you.</p>
  
  <p>This file probably is a fearture file, containing image's feature that QCAR has extracted.
  the config.src file is the hardest. the file format is as below:
  <a href="http://filebeam.com/971c7aa09a99e91aeabd1c47d5becc92.jpg" rel="nofollow">format2</a></p>
  
  <p>From the ASCII I see, this file probably is an image feature index file.</p>
  
  <p>When combaning, I can see no regular pattern.
  Is the src file made form feat file?</p>
  
  <p>Look forward to your further analysis!
  Thanks!</p>