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<html><head><title>dlib C++ Library - jmemansi.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jmemansi.c
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*
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* Copyright (C) 1992-1996, 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 provides a simple generic implementation of the system-
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* dependent portion of the JPEG memory manager. This implementation
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* assumes that you have the ANSI-standard library routine tmpfile().
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* Also, the problem of determining the amount of memory available
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* is shoved onto the user.
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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='#0000FF'>#include</font> "<a style='text-decoration:none' href='jmemsys.h.html'>jmemsys.h</a>" <font color='#009900'>/* import the system-dependent declarations */</font>
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<font color='#0000FF'>#ifndef</font> HAVE_STDLIB_H <font color='#009900'>/* <stdlib.h> should declare malloc(),free() */</font>
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<font color='#0000FF'>extern</font> <font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font> malloc <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font> size<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>extern</font> <font color='#0000FF'><u>void</u></font> free <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font>ptr<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>#endif</font>
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<font color='#0000FF'>#ifndef</font> SEEK_SET <font color='#009900'>/* pre-ANSI systems may not define this; */</font>
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<font color='#0000FF'>#define</font> SEEK_SET <font color='#979000'>0</font> <font color='#009900'>/* if not, assume 0 is correct */</font>
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<font color='#0000FF'>#endif</font>
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<font color='#009900'>/*
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* Memory allocation and freeing are controlled by the regular library
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* routines malloc() and free().
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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 color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_get_small'></a>jpeg_get_small</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, <font color='#0000FF'><u>size_t</u></font> sizeofobject<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>return</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> <font color='#BB00BB'>malloc</font><font face='Lucida Console'>(</font>sizeofobject<font face='Lucida Console'>)</font>;
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<b>}</b>
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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_free_small'></a>jpeg_free_small</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, <font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font> object, <font color='#0000FF'><u>size_t</u></font> sizeofobject<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#BB00BB'>free</font><font face='Lucida Console'>(</font>object<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/*
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* "Large" objects are treated the same as "small" ones.
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* NB: although we include FAR keywords in the routine declarations,
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* this file won't actually work in 80x86 small/medium model; at least,
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* you probably won't be able to process useful-size images in only 64KB.
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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> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_get_large'></a>jpeg_get_large</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, <font color='#0000FF'><u>size_t</u></font> sizeofobject<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>return</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> <font color='#BB00BB'>malloc</font><font face='Lucida Console'>(</font>sizeofobject<font face='Lucida Console'>)</font>;
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<b>}</b>
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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_free_large'></a>jpeg_free_large</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, <font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font> object, <font color='#0000FF'><u>size_t</u></font> sizeofobject<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#BB00BB'>free</font><font face='Lucida Console'>(</font>object<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/*
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* This routine computes the total memory space available for allocation.
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* It's impossible to do this in a portable way; our current solution is
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* to make the user tell us (with a default value set at compile time).
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* If you can actually get the available space, it's a good idea to subtract
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* a slop factor of 5% or so.
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*/</font>
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<font color='#0000FF'>#ifndef</font> DEFAULT_MAX_MEM <font color='#009900'>/* so can override from makefile */</font>
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<font color='#0000FF'>#define</font> DEFAULT_MAX_MEM <font color='#979000'>1000000</font>L <font color='#009900'>/* default: one megabyte */</font>
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<font color='#0000FF'>#endif</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_mem_available'></a>jpeg_mem_available</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, <font color='#0000FF'><u>long</u></font> min_bytes_needed,
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<font color='#0000FF'><u>long</u></font> max_bytes_needed, <font color='#0000FF'><u>long</u></font> already_allocated<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>return</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>max_memory_to_use <font color='#5555FF'>-</font> already_allocated;
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<b>}</b>
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<font color='#009900'>/*
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* Backing store (temporary file) management.
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* Backing store objects are only used when the value returned by
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* jpeg_mem_available is less than the total space needed. You can dispense
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* with these routines if you have plenty of virtual memory; see jmemnobs.c.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</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='read_backing_store'></a>read_backing_store</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, backing_store_ptr info,
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<font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font> buffer_address,
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<font color='#0000FF'><u>long</u></font> file_offset, <font color='#0000FF'><u>long</u></font> byte_count<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>fseek</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file, file_offset, SEEK_SET<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_TFILE_SEEK<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>JFREAD</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file, buffer_address, byte_count<font face='Lucida Console'>)</font>
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<font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> byte_count<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_TFILE_READ<font face='Lucida Console'>)</font>;
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<b>}</b>
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<b><a name='METHODDEF'></a>METHODDEF</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='write_backing_store'></a>write_backing_store</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, backing_store_ptr info,
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<font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font> buffer_address,
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<font color='#0000FF'><u>long</u></font> file_offset, <font color='#0000FF'><u>long</u></font> byte_count<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>fseek</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file, file_offset, SEEK_SET<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_TFILE_SEEK<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>JFWRITE</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file, buffer_address, byte_count<font face='Lucida Console'>)</font>
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<font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> byte_count<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_TFILE_WRITE<font face='Lucida Console'>)</font>;
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<b>}</b>
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<b><a name='METHODDEF'></a>METHODDEF</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='close_backing_store'></a>close_backing_store</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, backing_store_ptr info<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#BB00BB'>fclose</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Since this implementation uses tmpfile() to create the file,
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* no explicit file deletion is needed.
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*/</font>
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<b>}</b>
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<font color='#009900'>/*
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* Initial opening of a backing-store object.
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*
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* This version uses tmpfile(), which constructs a suitable file name
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* behind the scenes. We don't have to use info->temp_name[] at all;
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* indeed, we can't even find out the actual name of the temp file.
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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_open_backing_store'></a>jpeg_open_backing_store</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo, backing_store_ptr info,
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<font color='#0000FF'><u>long</u></font> total_bytes_needed<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>info<font color='#5555FF'>-</font><font color='#5555FF'>></font>temp_file <font color='#5555FF'>=</font> <font color='#BB00BB'>tmpfile</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXITS</font><font face='Lucida Console'>(</font>cinfo, JERR_TFILE_CREATE, "<font color='#CC0000'></font>"<font face='Lucida Console'>)</font>;
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info<font color='#5555FF'>-</font><font color='#5555FF'>></font>read_backing_store <font color='#5555FF'>=</font> read_backing_store;
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info<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_backing_store <font color='#5555FF'>=</font> write_backing_store;
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info<font color='#5555FF'>-</font><font color='#5555FF'>></font>close_backing_store <font color='#5555FF'>=</font> close_backing_store;
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<b>}</b>
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<font color='#009900'>/*
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* These routines take care of any system-dependent initialization and
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* cleanup required.
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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>long</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_mem_init'></a>jpeg_mem_init</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'>return</font> DEFAULT_MAX_MEM; <font color='#009900'>/* default for max_memory_to_use */</font>
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<b>}</b>
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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_mem_term'></a>jpeg_mem_term</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'>/* no work */</font>
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<b>}</b>
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</pre></body></html> |
