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   <TITLE>ACE Tutorial 015</TITLE>
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<CENTER><B><FONT SIZE=+2>ACE Tutorial 015</FONT></B></CENTER>

<CENTER><B><FONT SIZE=+2>Building a protocol stream</FONT></B></CENTER>

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While I might be able to come up with a competitive compressor, I
don't have a snowball's chance to code up encryption.  I'd be better
off piping the data through the standard Unix crypt command.
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So, while I was lazy with Compress, I'm realistic with Crypt.  I'll
show you the hooks and entry points and let someone else contribute an
encryptor.
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<PRE>
<font color=red>// page20.html,v 1.15 2003/08/19 15:08:26 schmidt Exp</font>

<font color=blue>#ifndef</font> <font color=purple>CRYPT_H</font>
<font color=blue>#define</font> <font color=purple>CRYPT_h</font>

<font color=blue>#include</font> "<font color=green>Protocol_Task.h</font>"

<font color=red>/* An interface (adaptor) between your favorite encryption method and
   an ACE_Stream.
*/</font>
class Crypt : public Protocol_Task
{
public:

  typedef Protocol_Task inherited;

  Crypt (void);

  ~Crypt (void);

protected:

  <font color=red>// Moving downstream will encrypt the data</font>
  int send (ACE_Message_Block *message,
            ACE_Time_Value *timeout);

  <font color=red>// And moving upstream will decrypt it.</font>
  int recv (ACE_Message_Block *message,
            ACE_Time_Value *timeout);
};

<font color=blue>#endif</font> <font color=red>/* CRYPT_H */</font>
</PRE>
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