filelist.doc
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C/C++
- IJG JPEG LIBRARY: FILE LIST
- Copyright (C) 1994-1998, Thomas G. Lane.
- This file is part of the Independent JPEG Group's software.
- For conditions of distribution and use, see the accompanying README file.
- Here is a road map to the files in the IJG JPEG distribution. The
- distribution includes the JPEG library proper, plus two application
- programs ("cjpeg" and "djpeg") which use the library to convert JPEG
- files to and from some other popular image formats. A third application
- "jpegtran" uses the library to do lossless conversion between different
- variants of JPEG. There are also two stand-alone applications,
- "rdjpgcom" and "wrjpgcom".
- THE JPEG LIBRARY
- ================
- Include files:
- jpeglib.h JPEG library's exported data and function declarations.
- jconfig.h Configuration declarations. Note: this file is not present
- in the distribution; it is generated during installation.
- jmorecfg.h Additional configuration declarations; need not be changed
- for a standard installation.
- jerror.h Declares JPEG library's error and trace message codes.
- jinclude.h Central include file used by all IJG .c files to reference
- system include files.
- jpegint.h JPEG library's internal data structures.
- jchuff.h Private declarations for Huffman encoder modules.
- jdhuff.h Private declarations for Huffman decoder modules.
- jdct.h Private declarations for forward & reverse DCT subsystems.
- jmemsys.h Private declarations for memory management subsystem.
- jversion.h Version information.
- Applications using the library should include jpeglib.h (which in turn
- includes jconfig.h and jmorecfg.h). Optionally, jerror.h may be included
- if the application needs to reference individual JPEG error codes. The
- other include files are intended for internal use and would not normally
- be included by an application program. (cjpeg/djpeg/etc do use jinclude.h,
- since its function is to improve portability of the whole IJG distribution.
- Most other applications will directly include the system include files they
- want, and hence won't need jinclude.h.)
- C source code files:
- These files contain most of the functions intended to be called directly by
- an application program:
- jcapimin.c Application program interface: core routines for compression.
- jcapistd.c Application program interface: standard compression.
- jdapimin.c Application program interface: core routines for decompression.
- jdapistd.c Application program interface: standard decompression.
- jcomapi.c Application program interface routines common to compression
- and decompression.
- jcparam.c Compression parameter setting helper routines.
- jctrans.c API and library routines for transcoding compression.
- jdtrans.c API and library routines for transcoding decompression.
- Compression side of the library:
- jcinit.c Initialization: determines which other modules to use.
- jcmaster.c Master control: setup and inter-pass sequencing logic.
- jcmainct.c Main buffer controller (preprocessor => JPEG compressor).
- jcprepct.c Preprocessor buffer controller.
- jccoefct.c Buffer controller for DCT coefficient buffer.
- jccolor.c Color space conversion.
- jcsample.c Downsampling.
- jcdctmgr.c DCT manager (DCT implementation selection & control).
- jfdctint.c Forward DCT using slow-but-accurate integer method.
- jfdctfst.c Forward DCT using faster, less accurate integer method.
- jfdctflt.c Forward DCT using floating-point arithmetic.
- jchuff.c Huffman entropy coding for sequential JPEG.
- jcphuff.c Huffman entropy coding for progressive JPEG.
- jcmarker.c JPEG marker writing.
- jdatadst.c Data destination manager for stdio output.
- Decompression side of the library:
- jdmaster.c Master control: determines which other modules to use.
- jdinput.c Input controller: controls input processing modules.
- jdmainct.c Main buffer controller (JPEG decompressor => postprocessor).
- jdcoefct.c Buffer controller for DCT coefficient buffer.
- jdpostct.c Postprocessor buffer controller.
- jdmarker.c JPEG marker reading.
- jdhuff.c Huffman entropy decoding for sequential JPEG.
- jdphuff.c Huffman entropy decoding for progressive JPEG.
- jddctmgr.c IDCT manager (IDCT implementation selection & control).
- jidctint.c Inverse DCT using slow-but-accurate integer method.
- jidctfst.c Inverse DCT using faster, less accurate integer method.
- jidctflt.c Inverse DCT using floating-point arithmetic.
- jidctred.c Inverse DCTs with reduced-size outputs.
- jdsample.c Upsampling.
- jdcolor.c Color space conversion.
- jdmerge.c Merged upsampling/color conversion (faster, lower quality).
- jquant1.c One-pass color quantization using a fixed-spacing colormap.
- jquant2.c Two-pass color quantization using a custom-generated colormap.
- Also handles one-pass quantization to an externally given map.
- jdatasrc.c Data source manager for stdio input.
- Support files for both compression and decompression:
- jerror.c Standard error handling routines (application replaceable).
- jmemmgr.c System-independent (more or less) memory management code.
- jutils.c Miscellaneous utility routines.
- jmemmgr.c relies on a system-dependent memory management module. The IJG
- distribution includes the following implementations of the system-dependent
- module:
- jmemnobs.c "No backing store": assumes adequate virtual memory exists.
- jmemansi.c Makes temporary files with ANSI-standard routine tmpfile().
- jmemname.c Makes temporary files with program-generated file names.
- jmemdos.c Custom implementation for MS-DOS (16-bit environment only):
- can use extended and expanded memory as well as temp files.
- jmemmac.c Custom implementation for Apple Macintosh.
- Exactly one of the system-dependent modules should be configured into an
- installed JPEG library (see install.doc for hints about which one to use).
- On unusual systems you may find it worthwhile to make a special
- system-dependent memory manager.
- Non-C source code files:
- jmemdosa.asm 80x86 assembly code support for jmemdos.c; used only in
- MS-DOS-specific configurations of the JPEG library.
- CJPEG/DJPEG/JPEGTRAN
- ====================
- Include files:
- cdjpeg.h Declarations shared by cjpeg/djpeg/jpegtran modules.
- cderror.h Additional error and trace message codes for cjpeg et al.
- transupp.h Declarations for jpegtran support routines in transupp.c.
- C source code files:
- cjpeg.c Main program for cjpeg.
- djpeg.c Main program for djpeg.
- jpegtran.c Main program for jpegtran.
- cdjpeg.c Utility routines used by all three programs.
- rdcolmap.c Code to read a colormap file for djpeg's "-map" switch.
- rdswitch.c Code to process some of cjpeg's more complex switches.
- Also used by jpegtran.
- transupp.c Support code for jpegtran: lossless image manipulations.
- Image file reader modules for cjpeg:
- rdbmp.c BMP file input.
- rdgif.c GIF file input (now just a stub).
- rdppm.c PPM/PGM file input.
- rdrle.c Utah RLE file input.
- rdtarga.c Targa file input.
- Image file writer modules for djpeg:
- wrbmp.c BMP file output.
- wrgif.c GIF file output (a mere shadow of its former self).
- wrppm.c PPM/PGM file output.
- wrrle.c Utah RLE file output.
- wrtarga.c Targa file output.
- RDJPGCOM/WRJPGCOM
- =================
- C source code files:
- rdjpgcom.c Stand-alone rdjpgcom application.
- wrjpgcom.c Stand-alone wrjpgcom application.
- These programs do not depend on the IJG library. They do use
- jconfig.h and jinclude.h, only to improve portability.
- ADDITIONAL FILES
- ================
- Documentation (see README for a guide to the documentation files):
- README Master documentation file.
- *.doc Other documentation files.
- *.1 Documentation in Unix man page format.
- change.log Version-to-version change highlights.
- example.c Sample code for calling JPEG library.
- Configuration/installation files and programs (see install.doc for more info):
- configure Unix shell script to perform automatic configuration.
- ltconfig Support scripts for configure (from GNU libtool).
- ltmain.sh
- config.guess
- config.sub
- install-sh Install shell script for those Unix systems lacking one.
- ckconfig.c Program to generate jconfig.h on non-Unix systems.
- jconfig.doc Template for making jconfig.h by hand.
- makefile.* Sample makefiles for particular systems.
- jconfig.* Sample jconfig.h for particular systems.
- ansi2knr.c De-ANSIfier for pre-ANSI C compilers (courtesy of
- L. Peter Deutsch and Aladdin Enterprises).
- Test files (see install.doc for test procedure):
- test*.* Source and comparison files for confidence test.
- These are binary image files, NOT text files.