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-<HTML>
-<HEAD>
-   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
-   <META NAME="Author" CONTENT="James CE Johnson">
-   <TITLE>ACE Tutorial 015</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 015</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Building a protocol stream</FONT></B></CENTER>
-
-<P>
-<HR WIDTH="100%">
-The encryption implementation isn't any smarter than that of the
-compressor.  Still, the hooks are there for you to insert your
-favorite library.
-<HR>
-<PRE>
-
-<font color=red>// $Id$</font>
-
-<font color=blue>#include</font> "<font color=green>Crypt.h</font>"
-<font color=blue>#include</font> "<font color=green>ace/SOCK_Stream.h</font>"
-
-<font color=red>/* The expected constructor...
- */</font>
-<font color=#008888>Crypt::Crypt</font>( int _thr_count )
-        : Protocol_Task(_thr_count)
-{
-}
-
-<font color=#008888>Crypt::~Crypt</font>(void)
-{
-}
-
-<font color=red>/* To send the data we'll apply a signature and encryption.
- */</font>
-int <font color=#008888>Crypt::send</font>(ACE_Message_Block *message, ACE_Time_Value *timeout)
-{
-    ACE_DEBUG ((LM_INFO, "<font color=green>(%P|%t) <font color=#008888>Crypt::send</font>() encrypting (%s)\n</font>", message->rd_ptr() ));
-
-        <font color=red>// I suspect that some encryptors might change the data size.</font>
-        <font color=red>// It probably isn't safe to create a same-size destination buffer.</font>
-    ACE_Message_Block * encrypted = new ACE_Message_Block( message->size() );
-
-        <font color=red>// Perform a bogus encryption algorithm and add our safety</font>
-        <font color=red>// signature.  Adding the original data size is also probably</font>
-        <font color=red>// a good idea that I haven't encorporated here.</font>
-    <font color=#008888>ACE_OS::sprintf</font>( encrypted->wr_ptr(), "<font color=green>ED:%s</font>", message->rd_ptr() );
-    encrypted->wr_ptr( strlen(encrypted->wr_ptr())+1 );
-
-        <font color=red>// Send the encrypted data down the stream to the next module</font>
-    this->put_next( encrypted );
-
-        <font color=red>// We're done here.</font>
-    message->release();
-
-    return( 0 );
-}
-
-<font color=red>/* The upstream movement requires that we decrypt what the peer has 
-   given us.
-*/</font>
-int <font color=#008888>Crypt::recv</font>(ACE_Message_Block *message, ACE_Time_Value *timeout)
-{
-    ACE_DEBUG ((LM_INFO, "<font color=green>(%P|%t) <font color=#008888>Crypt::recv</font>() decrypting (%s)\n</font>", message->rd_ptr() ));
-
-        <font color=red>// Create a destination for the decrypted data.  The same</font>
-        <font color=red>// block size caveat exists of course.</font>
-    ACE_Message_Block * decrypted = new ACE_Message_Block( message->size() );
-
-        <font color=red>// Check the signature as expected.</font>
-    if( <font color=#008888>ACE_OS::strncmp</font>( message->rd_ptr(), "<font color=green>ED:</font>", 3  ) )
-    {
-        ACE_DEBUG ((LM_INFO, "<font color=green>(%P|%t) Improperly encrypted data.\n</font>" ));
-        message->release();
-        return(-1);
-    }
-
-        <font color=red>// Don't forget to skip past the signature before decrypting</font>
-        <font color=red>// or things will be quite exciting!</font>
-    message->rd_ptr( 3 );
-    
-        <font color=red>// Perform a bogus decryption algorithm</font>
-    <font color=#008888>ACE_OS::sprintf</font>( decrypted->wr_ptr(), "<font color=green>%s</font>", message->rd_ptr() );
-    decrypted->wr_ptr( strlen(decrypted->wr_ptr())+1 );
-
-        <font color=red>// Send the decrypted data down the stream to the next module</font>
-    this->put_next( decrypted );
-
-        <font color=red>// We're done here.</font>
-    message->release();
-
-    return( 0 );
-}
-</PRE>
-<P><HR WIDTH="100%">
-<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page22.html">Continue This Tutorial</A>]</CENTER>