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POCopying DLL out of WAR results in LFs becoming CRLFs
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  1. POCopying DLL out of WAR results in LFs becoming CRLFs
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    copied!<p>I am using the Java Native Interface to include some statically compiled code in with my Java application. Particularly, I've got a DLL file with the compiled code in the WAR that contains my application.</p> <p>Unfortunately, the class loader can't load the DLL from inside the WAR (from preliminary research... if this is wrong, be sure to tell me!). So I have to copy the DLL out to a temporary folder, and then load it from there. </p> <p>But when I then try and load the copied DLL, I get <code>java.lang.UnsatisfiedLinkError: C:\path\to\dll\VIX.dll: %1 is not a valid Win32 application</code>. The file sizes look the same (both 401K, according to Windows), but it just doesn't work. Here's the code that does the copying: </p> <pre><code>InputStream ReadDLL = Thread.currentThread().getContextClassLoader().getResourceAsStream("/VIX.dll"); File file = new File(workDir, "VIX.dll"); OutputStream WriteDLL = null; try { WriteDLL = new FileOutputStream(file); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } byte[] buffer = new byte[1024]; int numchars; try { while((numchars = ReadDLL.read(buffer)) &gt; 0) { WriteDLL.write(buffer, 0, numchars); } ReadDLL.close(); WriteDLL.close(); } catch (IOException e) { e.printStackTrace(); } </code></pre> <p>Comparing the original and the copied versions of the DLL, I find that every instance of the byte 0x0A (The ASCII linefeed character) in the original is being replaced with two bytes: 0x0D0A (An ASCII CRLF). Of course, this being a DLL, the 0x0A is not <strong>actually</strong> a linefeed, just a binary opcode. But for some reason, Java insists on doing this helpful translation for me.</p> <p>Finally, the ReadDLL InputStream is being obtained by calling <code>Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);</code> where, obviously, <code>fileName</code> is the name of my file.</p>
 

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