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<html><head><title>dlib C++ Library - jcomapi.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jcomapi.c
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*
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* Copyright (C) 1994-1997, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains application interface routines that are used for both
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* compression and decompression.
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*/</font>
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<font color='#0000FF'>#define</font> JPEG_INTERNALS
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
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<font color='#009900'>/*
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* Abort processing of a JPEG compression or decompression operation,
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* but don't destroy the object itself.
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*
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* For this, we merely clean up all the nonpermanent memory pools.
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* Note that temp files (virtual arrays) are not allowed to belong to
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* the permanent pool, so we will be able to close all temp files here.
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* Closing a data source or destination, if necessary, is the application's
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* responsibility.
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*/</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_abort'></a>jpeg_abort</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'><u>int</u></font> pool;
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<font color='#009900'>/* Do nothing if called on a not-initialized or destroyed JPEG object. */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font color='#0000FF'>return</font>;
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<font color='#009900'>/* Releasing pools in reverse order might help avoid fragmentation
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* with some (brain-damaged) malloc libraries.
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*/</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>pool <font color='#5555FF'>=</font> JPOOL_NUMPOOLS<font color='#5555FF'>-</font><font color='#979000'>1</font>; pool <font color='#5555FF'>></font> JPOOL_PERMANENT; pool<font color='#5555FF'>-</font><font color='#5555FF'>-</font><font face='Lucida Console'>)</font> <b>{</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>free_pool<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, pool<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/* Reset overall state for possible reuse of object */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>is_decompressor<font face='Lucida Console'>)</font> <b>{</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font> DSTATE_START;
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<font color='#009900'>/* Try to keep application from accessing now-deleted marker list.
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* A bit kludgy to do it here, but this is the most central place.
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*/</font>
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<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#5555FF'>></font>marker_list <font color='#5555FF'>=</font> NULL;
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<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font> CSTATE_START;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/*
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* Destruction of a JPEG object.
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*
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* Everything gets deallocated except the master jpeg_compress_struct itself
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* and the error manager struct. Both of these are supplied by the application
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* and must be freed, if necessary, by the application. (Often they are on
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* the stack and so don't need to be freed anyway.)
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* Closing a data source or destination, if necessary, is the application's
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* responsibility.
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*/</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_destroy'></a>jpeg_destroy</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#009900'>/* We need only tell the memory manager to release everything. */</font>
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<font color='#009900'>/* NB: mem pointer is NULL if memory mgr failed to initialize. */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>self_destruct<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem <font color='#5555FF'>=</font> NULL; <font color='#009900'>/* be safe if jpeg_destroy is called twice */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font> <font color='#979000'>0</font>; <font color='#009900'>/* mark it destroyed */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Convenience routines for allocating quantization and Huffman tables.
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* (Would jutils.c be a more reasonable place to put these?)
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*/</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font>JQUANT_TBL <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_alloc_quant_table'></a>jpeg_alloc_quant_table</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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JQUANT_TBL <font color='#5555FF'>*</font>tbl;
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tbl <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JQUANT_TBL <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, JPOOL_PERMANENT, <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JQUANT_TBL<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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tbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>sent_table <font color='#5555FF'>=</font> FALSE; <font color='#009900'>/* make sure this is false in any new table */</font>
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<font color='#0000FF'>return</font> tbl;
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<b>}</b>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font>JHUFF_TBL <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_alloc_huff_table'></a>jpeg_alloc_huff_table</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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JHUFF_TBL <font color='#5555FF'>*</font>tbl;
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tbl <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JHUFF_TBL <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, JPOOL_PERMANENT, <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JHUFF_TBL<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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tbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>sent_table <font color='#5555FF'>=</font> FALSE; <font color='#009900'>/* make sure this is false in any new table */</font>
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<font color='#0000FF'>return</font> tbl;
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<b>}</b>
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</pre></body></html> |
