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<font color='#009900'>// Copyright (C) 2005 Davis E. King (davis@dlib.net)
</font><font color='#009900'>// License: Boost Software License See LICENSE.txt for the full license.
</font><font color='#0000FF'>#ifndef</font> DLIB_LZP_BUFFER_KERNEl_1_
<font color='#0000FF'>#define</font> DLIB_LZP_BUFFER_KERNEl_1_
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../algs.h.html'>../algs.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='lzp_buffer_kernel_abstract.h.html'>lzp_buffer_kernel_abstract.h</a>"
<font color='#0000FF'>namespace</font> dlib
<b>{</b>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'>class</font> <b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b>
<b>{</b>
<font color='#009900'>/*!
REQUIREMENTS ON sbuf
sbuf is an implementation of sliding_buffer/sliding_buffer_kernel_abstract.h
T == unsigned char
INITIAL VALUE
- buffer.size() == the size as defined by the constructor
- table_size == the number of elements in the table array
- for all i: buffer[i] == 0
- for all i: table[i] == buffer.size()
CONVENTION
- table_size == the number of elements in the table array
- size() == buffer.size()
- operator[](i) == buffer[i]
- if (table[hash()] != buffer.size()) then
- buffer.get_element_index(table[hash()]) == the index we will
predict for the current context
- else
- there is no prediction for the current context
- last_element == buffer.size()-1
This is LZP with just an order-3 model without context confirmation.
!*/</font>
<font color='#0000FF'>public</font>:
<font color='#0000FF'>explicit</font> <b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> buffer_size
<font face='Lucida Console'>)</font>;
<font color='#0000FF'>virtual</font> ~<b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b> <font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font>;
<font color='#0000FF'><u>void</u></font> <b><a name='clear'></a>clear</b><font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font>;
<font color='#0000FF'>inline</font> <font color='#0000FF'><u>void</u></font> <b><a name='add'></a>add</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> symbol
<font face='Lucida Console'>)</font>;
<font color='#0000FF'>inline</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='predict_match'></a>predict_match</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font color='#5555FF'>&</font> index
<font face='Lucida Console'>)</font>;
<font color='#0000FF'>inline</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='size'></a>size</b> <font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>;
<font color='#0000FF'>inline</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> <b><a name='operator'></a>operator</b>[] <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> index
<font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>;
<font color='#0000FF'>private</font>:
<font color='#0000FF'>inline</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> <b><a name='hash'></a>hash</b> <font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
<font color='#009900'>/*!
ensures
- returns a hash computed from the current context. This hash
is always in the range for table.
!*/</font>
<b>{</b>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> temp <font color='#5555FF'>=</font> buffer[<font color='#979000'>0</font>];
temp <font color='#5555FF'><</font><font color='#5555FF'><</font><font color='#5555FF'>=</font> <font color='#979000'>16</font>;
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> temp2 <font color='#5555FF'>=</font> buffer[<font color='#979000'>1</font>];
temp2 <font color='#5555FF'><</font><font color='#5555FF'><</font><font color='#5555FF'>=</font> <font color='#979000'>8</font>;
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> temp3 <font color='#5555FF'>=</font> buffer[<font color='#979000'>2</font>];
temp <font color='#5555FF'>=</font> temp<font color='#5555FF'>|</font>temp2<font color='#5555FF'>|</font>temp3;
temp <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>temp<font color='#5555FF'>></font><font color='#5555FF'>></font><font color='#979000'>11</font><font face='Lucida Console'>)</font>^temp<font face='Lucida Console'>)</font><font color='#5555FF'>&</font><font color='#979000'>0xFFFF</font>;
<font color='#0000FF'>return</font> temp;
<b>}</b>
sbuf buffer;
<font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> table_size;
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font color='#5555FF'>*</font> <font color='#0000FF'>const</font> table;
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> last_element;
<font color='#009900'>// restricted functions
</font> <b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b><font face='Lucida Console'>(</font><font color='#0000FF'>const</font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font><font color='#5555FF'>&</font><font face='Lucida Console'>)</font>; <font color='#009900'>// copy constructor
</font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font><font color='#5555FF'>&</font> <b><a name='operator'></a>operator</b><font color='#5555FF'>=</font><font face='Lucida Console'>(</font><font color='#0000FF'>const</font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font><font color='#5555FF'>&</font><font face='Lucida Console'>)</font>; <font color='#009900'>// assignment operator
</font>
<b>}</b>;
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font><font color='#009900'>// ----------------------------------------------------------------------------------------
</font> <font color='#009900'>// member function definitions
</font><font color='#009900'>// ----------------------------------------------------------------------------------------
</font><font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> buffer_size
<font face='Lucida Console'>)</font> :
table_size<font face='Lucida Console'>(</font><font color='#979000'>65536</font><font face='Lucida Console'>)</font>,
table<font face='Lucida Console'>(</font><font color='#0000FF'>new</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font>[table_size]<font face='Lucida Console'>)</font>
<b>{</b>
buffer.<font color='#BB00BB'>set_size</font><font face='Lucida Console'>(</font>buffer_size<font face='Lucida Console'>)</font>;
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>; <font color='#5555FF'>+</font><font color='#5555FF'>+</font>i<font face='Lucida Console'>)</font>
buffer[i] <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> table_size; <font color='#5555FF'>+</font><font color='#5555FF'>+</font>i<font face='Lucida Console'>)</font>
table[i] <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
last_element <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#979000'>1</font>;
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
~<b><a name='lzp_buffer_kernel_1'></a>lzp_buffer_kernel_1</b> <font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>delete</font> [] table;
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='clear'></a>clear</b><font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>; <font color='#5555FF'>+</font><font color='#5555FF'>+</font>i<font face='Lucida Console'>)</font>
buffer[i] <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> table_size; <font color='#5555FF'>+</font><font color='#5555FF'>+</font>i<font face='Lucida Console'>)</font>
table[i] <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='add'></a>add</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> symbol
<font face='Lucida Console'>)</font>
<b>{</b>
buffer.<font color='#BB00BB'>rotate_left</font><font face='Lucida Console'>(</font><font color='#979000'>1</font><font face='Lucida Console'>)</font>;
buffer[<font color='#979000'>0</font>] <font color='#5555FF'>=</font> symbol;
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='predict_match'></a>predict_match</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font color='#5555FF'>&</font> index
<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#BB00BB'>hash</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>table[i] <font color='#5555FF'>!</font><font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<b>{</b>
index <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>get_element_index</font><font face='Lucida Console'>(</font>table[i]<font face='Lucida Console'>)</font>;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>index <font color='#5555FF'>></font> <font color='#979000'>20</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>// update the prediction for this context
</font> table[i] <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>get_element_id</font><font face='Lucida Console'>(</font>last_element<font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#0000FF'>return</font> <font color='#979000'>3</font>;
<b>}</b>
<font color='#0000FF'>else</font>
<b>{</b>
<font color='#009900'>// update the prediction for this context
</font> table[i] <font color='#5555FF'>=</font> buffer.<font color='#BB00BB'>get_element_id</font><font face='Lucida Console'>(</font>last_element<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>0</font>;
<b>}</b>
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='size'></a>size</b> <font face='Lucida Console'>(</font>
<font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
<b>{</b>
<font color='#0000FF'>return</font> buffer.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sbuf
<font color='#5555FF'>></font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> lzp_buffer_kernel_1<font color='#5555FF'><</font>sbuf<font color='#5555FF'>></font>::
<b><a name='operator'></a>operator</b>[] <font face='Lucida Console'>(</font>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> index
<font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
<b>{</b>
<font color='#0000FF'>return</font> buffer[index];
<b>}</b>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_LZP_BUFFER_KERNEl_1_
</font>
</pre></body></html>