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408 lines
6 KiB
C
408 lines
6 KiB
C
/**
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** $Header: /roq/libim/imschemes.c 1 11/02/99 4:38p Zaphod $
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** Copyright (c) 1989-1995 San Diego Supercomputer Center (SDSC)
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** a division of General Atomics, San Diego, California, USA
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**
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** Users and possessors of this source code are hereby granted a
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** nonexclusive, royalty-free copyright and design patent license to
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** use this code in individual software. License is not granted for
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** commercial resale, in whole or in part, without prior written
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** permission from SDSC. This source is provided "AS IS" without express
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** or implied warranty of any kind.
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**
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** For further information contact:
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** E-Mail: info@sds.sdsc.edu
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**
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** Surface Mail: Information Center
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** San Diego Supercomputer Center
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** P.O. Box 85608
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** San Diego, CA 92138-5608
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** (619) 534-5000
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**/
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#define HEADER " $Header: /roq/libim/imschemes.c 1 11/02/99 4:38p Zaphod $"
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/**
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** FILE
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** imschemes.c - compression scheme structure declaration
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**
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** PROJECT
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** libim - SDSC image manipulation library
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**
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** DESCRIPTION
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** imschemes.c contains the structure that holds routines/ info for
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** reading/ writing encoded files.
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**
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** PUBLIC CONTENTS
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** d =defined constant
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** f =function
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** m =defined macro
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** t =typedef/struct/union
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** v =variable
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** ? =other
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**
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** ImGetCompressSchemes f get the list of compression/encoding schemes
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**
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** PRIVATE CONTENTS
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**
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** imCompressSchemes v list of compression/encoding schemes
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**
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**
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** HISTORY
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** $Log: /roq/libim/imschemes.c $
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*
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* 1 11/02/99 4:38p Zaphod
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* Revision 1.3 1995/06/29 00:28:04 bduggan
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* updated copyright year
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*
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* Revision 1.2 1995/06/16 08:45:42 bduggan
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* Took out declarations of schemes. Moved 'em into
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* immiscschemes.c
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*
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* Revision 1.1 1995/05/24 17:05:59 bduggan
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* Initial revision
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*
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**/
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//#include <unistd.h>
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//#include <sys/wait.h>
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#include "im.h"
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#include "iminternal.h"
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/**
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** CODE CREDITS
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** Custom development, Brian Duggan, San Diego Supercomputer Center, 1995.
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**/
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/*
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* VARIABLE
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* imCompressSchemes
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*
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* DESCRIPTION
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* A list of compression schemes that are supported.
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*
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* ADDING A NEW SCHEME
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*
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* Note that here and throughout the library, we try to refer to a file
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* compression 'scheme' and an image 'format', and not a compression
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* 'format', in order to keep things clear.
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*
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* Schemes may be added to this list quite easily.
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* Here's how to do it:
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*
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* 1. Add the declaration 'extern ImCompressScheme myscheme'
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* 2. Add &myscheme to the list 'imCompressSchemes'.
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* 3. Fill up the structure 'myscheme' with the following
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* elements:
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* - Suffixes of the compressed files
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* - The name of the scheme
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* - Magic number(s) for the scheme
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* - a subroutine that will encode a file
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* - a subroutine that will decode a file
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*
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* Here's an explanation of these structure elements for
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* Lempel-Ziv Encoding (.Z files).
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*
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* 1. Suffix list.
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* First we declare imCompressZNames as...
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* extern char* imCompressZNames[] = { "Z", NULL };
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* Then imCompressZNames is the first element of the ImCompressScheme
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* structure.
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*
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* 2. Scheme name.
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* "Lempel-Ziv Encoding" is the second element of the ImCompressScheme
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* structure.
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*
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* 3. Magic numbers
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* We make the following declarations:
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* static unsigned char imZMagic1[] = { 0x1f, 0x9d };
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* static unsigned char imZMagic2[] = { 0x9d, 0x1f };
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* static ImFileMagic imZMagic[] =
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* {
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* { 0, 2, imZMagic1},
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* { 0, 2, imZMagic2},
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* { 0, 0, NULL}
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* };
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* This signifies that out files may have one of the following two
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* magic numbers: 1) a magic number of length 2 at location 0 (1f9d)
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* or 2) a magic number of length 2 at location 0 (9d1f)
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*
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* 4. Decoding subroutine
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* The subroutine 'imZDecode' has the responsibility of decoding the
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* the file passed to it, and destroying that file. It must also name
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* the new file that it creates, and return that name.
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*
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* 5. Encoding subroutine.
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* The subroutine 'imZEncode' has the responsibility of encoding the
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* file passed to it, and destroying that file. It must also name the
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* new file that it creates, and return that name.
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*
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* IMPORTANT:
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* The decoding and encoding subroutines will receive a file
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* such as /usr/tmp/tmpfile. When creating a new file, the new file name
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* should be as close to the old file name as possible. More
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* specifically, the file should be in the temp directory. Thus, creating
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* a file such as /usr/tmp/tmpfile.z is fine, but creating a file like
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* 'tmpfile.z' (in the working directory) is not.
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*
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* The reason we don't want to create a file in the working
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* directory is that the file that is created by these routines will later
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* be destroyed.
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*
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* Many of these routines assume that it's okay to destroy a file
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* that has a name similar to the incoming file. e.g. if the incoming
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* file is '/usr/tmp/im.zzyxxy', then it's okay to destroy anything named
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* '/usr/tmp/im.zzyxxy.Z'.
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*
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*
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* The routines in this file are all simple calls to external programs.
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* If you wish to do something more elaborate, then you may want to make a
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* seperate file for your structure, and function declarations, and simply
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* declare the structure as an 'extern' in this file.
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*
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*/
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#ifndef WIN32
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extern ImCompressScheme imCompressuu;
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extern ImCompressScheme imCompressGZ;
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extern ImCompressScheme imCompressz;
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extern ImCompressScheme imCompressZ;
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static ImCompressScheme *imCompressSchemes[] =
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{
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&imCompressuu,
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&imCompressGZ,
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&imCompressz,
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&imCompressZ,
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NULL
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};
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#else
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static ImCompressScheme *imCompressSchemes[] =
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{
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NULL
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};
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#endif
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/*
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* FUNCTION
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* ImGetCompressSchemes
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*
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* DESCRIPTION
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* Get the list of schemes.
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*/
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ImCompressScheme**
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#ifdef __STDC__
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ImGetCompressSchemes( void )
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#else
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ImGetCompressSchemes( )
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#endif
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{
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return imCompressSchemes;
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}
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