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   <title>Data Compression</title>

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   <body>
      <br/><br/>
  <p>
     This page contains a bunch of objects that implement various parts of compression algorithms.  
     They can be put together in different ways to construct many different algorithms.  
     Note that the <a href="#compress_stream">compress_stream</a> object contains complete compression algorithms.  So if you
     just want to compress some data then you can easily use that object and not bother with the others.
  </p>
      <p>
      In the column to the right you can see benchmark data for each of the compress_stream 
      typedefs.  The times measured are the time it takes to compress and then
      decompress each file.  It was run on a 3.0ghz P4.   For reference see the Canterbury corpus 
      <a href="http://corpus.canterbury.ac.nz/">web site</a>.
      </p>


   
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   <menu width="200">
    <top>
      <section>
         <name>Objects</name>
         <item>compress_stream</item>
         <item>conditioning_class</item>
         <item>entropy_decoder</item>
         <item>entropy_encoder</item>
         <item>entropy_decoder_model</item>
         <item>entropy_encoder_model</item>
         <item>lz77_buffer</item>
         <item>lzp_buffer</item>
      </section>
 
 
 
 
      <section>
         <name>Benchmarks</name>
         <item>
            <name>kernel_1a</name>
            <link>kernel_1a.html</link>
         </item>
         <item>
            <name>kernel_1b</name>
            <link>kernel_1b.html</link>
         </item>
         <item>
            <name>kernel_1c</name>
            <link>kernel_1c.html</link>
         </item>
         <item>
            <name>kernel_1da</name>
            <link>kernel_1da.html</link>
         </item>
         <item>
            <name>kernel_1db</name>
            <link>kernel_1db.html</link>
         </item>
         <item>
            <name>kernel_1ea</name>
            <link>kernel_1ea.html</link>
         </item>
         <item>
            <name>kernel_1eb</name>
            <link>kernel_1eb.html</link>
         </item>
         <item>
            <name>kernel_1ec</name>
            <link>kernel_1ec.html</link>
         </item>
         <item>
            <name>kernel_2a</name>
            <link>kernel_2a.html</link>
         </item>
         <item>
            <name>kernel_3a</name>
            <link>kernel_3a.html</link>
         </item>
         <item>
            <name>kernel_3b</name>
            <link>kernel_3b.html</link>
         </item>
      </section>
    </top>  
   </menu>

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   <components>
   
      
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      <component>
         <name>compress_stream</name>
         <file>dlib/compress_stream.h</file>
         <spec_file>dlib/compress_stream/compress_stream_kernel_abstract.h</spec_file>
         <description>
            This object is pretty straight forward.  It has no state and just 
            contains the functions compress and decompress.
            They do just what their names imply to iostream objects.       
         </description>
         
         <examples>
            <example>compress_stream_ex.cpp.html</example>
            <example>file_to_code_ex.cpp.html</example>
         </examples>

         <implementations>
            <implementation>
               <name>compress_stream_kernel_1</name>
               <file>dlib/compress_stream/compress_stream_kernel_1.h</file>
               <description> 
                  This implementation is done using the <a href="#entropy_encoder_model">entropy_encoder_model</a> and 
                  <a href="#entropy_decoder_model">entropy_decoder_model</a> objects.
               </description> 
   

               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_1b and entropy_decoder_model_kernel_1b</description>
                  </typedef>
                  <typedef>
                     <name>kernel_1b</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_2b and entropy_decoder_model_kernel_2b  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1c</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_3b and entropy_decoder_model_kernel_3b  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1da</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_4a and entropy_decoder_model_kernel_4a  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1db</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_4b and entropy_decoder_model_kernel_4b  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1ea</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_5a and entropy_decoder_model_kernel_5a  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1eb</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_5b and entropy_decoder_model_kernel_5b  </description>
                  </typedef>
                  <typedef>
                     <name>kernel_1ec</name>
                     <description>is a typedef for compress_stream_kernel_1 which uses entropy_decoder_model_kernel_5c and entropy_decoder_model_kernel_5c  </description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>compress_stream_kernel_2</name>
               <file>dlib/compress_stream/compress_stream_kernel_2.h</file>
               <description> 
                  This implementation is done using the <a href="#entropy_encoder_model">entropy_encoder_model</a> and 
                  <a href="#entropy_decoder_model">entropy_decoder_model</a> objects.  It also uses the
                  <a href="#lz77_buffer">lz77_buffer</a> object.  It uses the entropy coder models to
                  encode symbols when there is no match found by the lz77_buffer.  
               </description> 
  

               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for compress_stream_kernel_2 which uses entropy_encoder_model_kernel_2b, entropy_decoder_model_kernel_2b, and lz77_buffer_kernel_2a.</description>
                  </typedef>
                  
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>compress_stream_kernel_3</name>
               <file>dlib/compress_stream/compress_stream_kernel_3.h</file>
               <description> 
                  This implementation is done using the the <a href="#lzp_buffer">lzp_buffer</a> object and
                  <a href="other.html#crc32">crc32</a> object.  It does not use any sort of entropy coding, instead
                  a byte aligned output method is used.
               </description> 
  

               <typedefs>
                  <typedef>
                     <name>kernel_3a</name>
                     <description>is a typedef for compress_stream_kernel_3 which uses lzp_buffer_kernel_1.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_3b</name>
                     <description>is a typedef for compress_stream_kernel_3 which uses lzp_buffer_kernel_2.</description>
                  </typedef>
                  
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
      
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      <component checked="true">
         <name>conditioning_class</name>
         <file>dlib/conditioning_class.h</file>
         <spec_file>dlib/conditioning_class/conditioning_class_kernel_abstract.h</spec_file>
         <description>
                This object represents a conditioning class used for arithmetic style
                compression.  It maintains the cumulative counts which are needed
                by the entropy_encoder and entropy_decoder objects below.  
         </description>
         
         <implementations>
            <implementation>
               <name>conditioning_class_kernel_1</name>
               <file>dlib/conditioning_class/conditioning_class_kernel_1.h</file>
               <description> 
                  This implementation is done using an array to store all the counts and they are summed 
                  whenever the cumulative counts are requested.  It's pretty straight forward.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for conditioning_class_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
            <implementation>
               <name>conditioning_class_kernel_2</name>
               <file>dlib/conditioning_class/conditioning_class_kernel_2.h</file>
               <description> 
                  This implementation is done using a binary tree where each node in the tree represents one symbol and
                  contains that symbols count and the sum of all the counts for the nodes to the left.  This way
                  when you request a cumulative count it can be computed by visiting log n nodes where n is the 
                  size of the alphabet.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for conditioning_class_kernel_2</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                        
            <implementation>
               <name>conditioning_class_kernel_3</name>
               <file>dlib/conditioning_class/conditioning_class_kernel_3.h</file>
               <description> 
                  This implementation is done using an array to store all the counts and they are 
                  summed whenever the cumulative counts are requested. The counts are also kept in 
                  semi-sorted order to speed up the calculation of the cumulative count.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_3a</name>
                     <description>is a typedef for conditioning_class_kernel_3</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>conditioning_class_kernel_4</name>
               <file>dlib/conditioning_class/conditioning_class_kernel_4.h</file>
               <description> 
                  This implementation is done using a linked list to store all the counts and they are 
                  summed whenever the cumulative counts are requested. The counts are also kept in 
                  semi-sorted order to speed up the calculation of the cumulative count.  This implementation
                  also uses the <a href="other.html#memory_manager">memory_manager</a> component to create a 
                  memory pool of linked list nodes.  This implementation is especially useful for high order
                  contexts and/or very large and sparce alphabets.
               </description> 
    
    
               <typedefs>
                  <typedef>
                     <name>kernel_4a</name>
                     <description>is a typedef for conditioning_class_kernel_4 with a memory pool of 10,000 nodes.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_4b</name>
                     <description>is a typedef for conditioning_class_kernel_4 with a memory pool of 100,000 nodes.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_4c</name>
                     <description>is a typedef for conditioning_class_kernel_4 with a memory pool of 1,000,000 nodes.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_4d</name>
                     <description>is a typedef for conditioning_class_kernel_4 with a memory pool of 10,000,000 nodes.</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
      
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      <component checked="true">
         <name>entropy_decoder</name>
         <file>dlib/entropy_decoder.h</file>
         <spec_file>dlib/entropy_decoder/entropy_decoder_kernel_abstract.h</spec_file>
         <description>
            This object represents an entropy decoder.  E.g. the decoding part of 
            an arithmetic coder.
         </description>
         
         <implementations>
            <implementation>
               <name>entropy_decoder_kernel_1</name>
               <file>dlib/entropy_decoder/entropy_decoder_kernel_1.h</file>
               <description> 
                  This object is implemented using arithmetic coding and is done in the 
                  straight forward way using integers and fixed precision math. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for entropy_decoder_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation>
            <implementation>
               <name>entropy_decoder_kernel_2</name>
               <file>dlib/entropy_decoder/entropy_decoder_kernel_2.h</file>
               <description> 
                  This object is implemented using "range" coding and is done 
                  in the straight forward way using integers and fixed precision math. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for entropy_decoder_kernel_2</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
      
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      <component checked="true">
         <name>entropy_encoder</name>
         <file>dlib/entropy_encoder.h</file>
         <spec_file>dlib/entropy_encoder/entropy_encoder_kernel_abstract.h</spec_file>
         <description>
            This object represents an entropy encoder.  E.g. the encoding part of 
            an arithmetic coder.
         </description>
         
         <implementations>
            <implementation>
               <name>entropy_encoder_kernel_1</name>
               <file>dlib/entropy_encoder/entropy_encoder_kernel_1.h</file>
               <description> 
                  This object is implemented using arithmetic coding and is done in the 
                  straight forward way using integers and fixed precision math. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for entropy_encoder_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation>
            <implementation>
               <name>entropy_encoder_kernel_2</name>
               <file>dlib/entropy_encoder/entropy_encoder_kernel_2.h</file>
               <description> 
                  This object is implemented using "range" coding and is done 
                  in the straight forward way using integers and fixed precision math. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for entropy_encoder_kernel_2</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
      
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      <component>
         <name>entropy_decoder_model</name>
         <file>dlib/entropy_decoder_model.h</file>
         <spec_file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_abstract.h</spec_file>
         <description>
                This object represents some kind of statistical model.  You
                can use it to read symbols from an entropy_decoder and it will calculate
                the cumulative counts/probabilities and manage contexts for you.
         </description>
         
         <implementations>
            <implementation>
               <name>entropy_decoder_model_kernel_1</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_1.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for entropy_decoder_model_kernel_1 that uses conditioning_class_kernel_1a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_1b</name>
                     <description>is a typedef for entropy_decoder_model_kernel_1 that uses conditioning_class_kernel_2a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_1c</name>
                     <description>is a typedef for entropy_decoder_model_kernel_1 that uses conditioning_class_kernel_3a</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_decoder_model_kernel_2</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_2.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-1-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for entropy_decoder_model_kernel_2 that uses conditioning_class_kernel_1a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2b</name>
                     <description>is a typedef for entropy_decoder_model_kernel_2 that uses conditioning_class_kernel_2a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2c</name>
                     <description>is a typedef for entropy_decoder_model_kernel_2 that uses conditioning_class_kernel_3a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2d</name>
                     <description>is a typedef for entropy_decoder_model_kernel_2 that uses conditioning_class_kernel_2a for its order-0
                         context and conditioning_class_kernel_4b for its order-1 context.</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_decoder_model_kernel_3</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_3.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-2-1-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_3a</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_3 that uses conditioning_class_kernel_1a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_3b</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_3 that uses conditioning_class_kernel_2a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_3c</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_3 that uses conditioning_class_kernel_3a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_decoder_model_kernel_4</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_4.h</file>
               <description> 
                  This object is implemented using a variation of the PPM algorithm described by Alistair Moffat in his paper "Implementing 
                  the PPM data compression scheme."
                  It provides template arguments to select the maximum order and maximum memory to use.  For speed,
                  exclusions are not used.  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_4a</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_4 with the max order set to 4 and the max number
                        of nodes set to 200,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_4b</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_4 with the max order set to 5 and the max number
                        of nodes set to 1,000,000</description>
                  </typedef>
               </typedefs>                
               
            </implementation>    
                     
            <implementation>
               <name>entropy_decoder_model_kernel_5</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_5.h</file>
               <description> 
                  This object is implemented using a variation of the PPM algorithm described by Alistair Moffat in his paper "Implementing 
                  the PPM data compression scheme."
                  It provides template arguments to select the maximum order and maximum memory to use.  Exclusions are used. The escape method used is method D.
                  This implementation is very much like kernel_4 except it is tuned for higher compression rather than speed.
                  This also uses Dmitry Shkarin's Information Inheritance scheme.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_5a</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_5 with the max order set to 4 and the max number
                        of nodes set to 200,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_5b</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_5 with the max order set to 5 and the max number
                         of nodes set to 1,000,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_5c</name>
                     <description>   is a typedef for entropy_decoder_model_kernel_5 with the max order set to 7 and the max number
                         of nodes set to 2,500,000</description>
                  </typedef>
               </typedefs>                
               
            </implementation>    
                     
            <implementation>
               <name>entropy_decoder_model_kernel_6</name>
               <file>dlib/entropy_decoder_model/entropy_decoder_model_kernel_6.h</file>
               <description> 
                  This object just assigns every symbol the same probability.  I.e. it uses an <i>order-(-1)</i> model.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_6a</name>
                     <description>is a typedef for entropy_decoder_model_kernel_6</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
      
      
   <!-- ************************************************************************* -->
      
      <component checked="true">
         <name>entropy_encoder_model</name>
         <file>dlib/entropy_encoder_model.h</file>
         <spec_file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_abstract.h</spec_file>
         <description>
                This object represents some kind of statistical model.  You
                can use it to write symbols to an entropy_encoder and it will calculate
                the cumulative counts/probabilities and manage contexts for you.
         </description>
         
         <implementations>
            <implementation>
               <name>entropy_encoder_model_kernel_1</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_1.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for entropy_encoder_model_kernel_1 that uses conditioning_class_kernel_1a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_1b</name>
                     <description>is a typedef for entropy_encoder_model_kernel_1 that uses conditioning_class_kernel_2a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_1c</name>
                     <description>is a typedef for entropy_encoder_model_kernel_1 that uses conditioning_class_kernel_3a</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_encoder_model_kernel_2</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_2.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-1-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for entropy_encoder_model_kernel_2 that uses conditioning_class_kernel_1a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2b</name>
                     <description>is a typedef for entropy_encoder_model_kernel_2 that uses conditioning_class_kernel_2a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2c</name>
                     <description>is a typedef for entropy_encoder_model_kernel_2 that uses conditioning_class_kernel_3a</description>
                  </typedef>
                  <typedef>
                     <name>kernel_2d</name>
                     <description>is a typedef for entropy_encoder_model_kernel_2 that uses conditioning_class_kernel_2a for its order-0
                         context and conditioning_class_kernel_4b for its order-1 context.</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_encoder_model_kernel_3</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_3.h</file>
               <description> 
                  This object is implemented using the <a href="#conditioning_class">conditioning_class</a> component.
                  It implements an <i>order-2-1-0</i> finite context model and uses lazy exclusions and update exclusions.  
                  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_3a</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_3 that uses conditioning_class_kernel_1a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_3b</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_3 that uses conditioning_class_kernel_2a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
                  <typedef>
                     <name>kernel_3c</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_3 that uses conditioning_class_kernel_3a for orders 0 and 1
                        and conditioning_class_kernel_4b for order-2.</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
            <implementation>
               <name>entropy_encoder_model_kernel_4</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_4.h</file>
               <description> 
                  This object is implemented using a variation of the PPM algorithm described by Alistair Moffat in his paper "Implementing 
                  the PPM data compression scheme."
                  It provides template arguments to select the maximum order and maximum memory to use.  For speed,
                  exclusions are not used.  The escape method used is method D.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_4a</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_4 with the max order set to 4 and the max number
                        of nodes set to 200,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_4b</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_4 with the max order set to 5 and the max number
                        of nodes set to 1,000,000</description>
                  </typedef>
               </typedefs>                
               
            </implementation>    
                     
            <implementation>
               <name>entropy_encoder_model_kernel_5</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_5.h</file>
               <description> 
                  This object is implemented using a variation of the PPM algorithm described by Alistair Moffat in his paper "Implementing 
                  the PPM data compression scheme."
                  It provides template arguments to select the maximum order and maximum memory to use.  Exclusions are used. The escape method used is method D.
                  This implementation is very much like kernel_4 except it is tuned for higher compression rather than speed.
                  This also uses Dmitry Shkarin's Information Inheritance scheme.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_5a</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_5 with the max order set to 4 and the max number
                        of nodes set to 200,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_5b</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_5 with the max order set to 5 and the max number
                         of nodes set to 1,000,000</description>
                  </typedef>
                  <typedef>
                     <name>kernel_5c</name>
                     <description>   is a typedef for entropy_encoder_model_kernel_5 with the max order set to 7 and the max number
                         of nodes set to 2,500,000</description>
                  </typedef>
               </typedefs>                
               
            </implementation>    
                     
            <implementation>
               <name>entropy_encoder_model_kernel_6</name>
               <file>dlib/entropy_encoder_model/entropy_encoder_model_kernel_6.h</file>
               <description> 
                  This object just assigns every symbol the same probability.  I.e. it uses an <i>order-(-1)</i> model.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_6a</name>
                     <description>is a typedef for entropy_encoder_model_kernel_6</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
      
      
   <!-- ************************************************************************* -->
      
      <component checked="true">
         <name>lz77_buffer</name>
         <file>dlib/lz77_buffer.h</file>
         <spec_file>dlib/lz77_buffer/lz77_buffer_kernel_abstract.h</spec_file>
         <description>
            This object represents a pair of buffers (history and lookahead buffers) 
                used during lz77 style compression.
         </description>
         
         <implementations>
            <implementation>
               <name>lz77_buffer_kernel_1</name>
               <file>dlib/lz77_buffer/lz77_buffer_kernel_1.h</file>
               <description> 
                  This object is implemented using the <a href="containers.html#sliding_buffer">sliding_buffer</a> and it 
                  just does simple linear searches of the history buffer to find matches. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for lz77_buffer_kernel_1 that uses sliding_buffer_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
            <implementation>
               <name>lz77_buffer_kernel_2</name>
               <file>dlib/lz77_buffer/lz77_buffer_kernel_2.h</file>
               <description> 
                  This object is implemented using the <a href="containers.html#sliding_buffer">sliding_buffer</a>.  It
                  finds matches by using a hash table. 
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for lz77_buffer_kernel_2 that uses sliding_buffer_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
      
   <!-- ************************************************************************* -->
      
      <component checked="true">
         <name>lzp_buffer</name>
         <file>dlib/lzp_buffer.h</file>
         <spec_file>dlib/lzp_buffer/lzp_buffer_kernel_abstract.h</spec_file>
         <description>
                This object represents some varation on the LZP algorithm
                described by Charles Bloom in his paper "LZP: a new data
                compression algorithm"
         </description>
         
         <implementations>
            <implementation>
               <name>lzp_buffer_kernel_1</name>
               <file>dlib/lzp_buffer/lzp_buffer_kernel_1.h</file>
               <description> 
                  This object is implemented using the <a href="containers.html#sliding_buffer">sliding_buffer</a> and uses
                  an order-3 model to predict matches.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_1a</name>
                     <description>is a typedef for lzp_buffer_kernel_1 that uses sliding_buffer_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
            <implementation>
               <name>lzp_buffer_kernel_2</name>
               <file>dlib/lzp_buffer/lzp_buffer_kernel_2.h</file>
               <description> 
                  This object is implemented using the <a href="containers.html#sliding_buffer">sliding_buffer</a> and uses
                  an order-5-4-3 model to predict matches.
               </description> 
    
               <typedefs>
                  <typedef>
                     <name>kernel_2a</name>
                     <description>is a typedef for lzp_buffer_kernel_2 that uses sliding_buffer_kernel_1</description>
                  </typedef>
               </typedefs>                
               
            </implementation> 
                     
         </implementations>
                        
      </component>
            
   <!-- ************************************************************************* -->
      
   </components>

   <!-- ************************************************************************* -->


</doc>
