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Restored the 'mojo'.

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@5043 626c5289-ae23-0410-ae9c-e8d60b6d4f22
This commit is contained in:
Dave Beazley 2003-09-01 16:23:31 +00:00
commit ae140cc4e0
1 changed files with 110 additions and 14 deletions
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124
SWIG/Examples/GIFPlot/Lib/gif.c
View file

@ -1,13 +1,77 @@
/* -----------------------------------------------------------------------------
* gif.c
*
* GIF encoding with broken compression algorithm to avoid LZW.
/**********************************************************************
* GIFPlot 0.0
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
* Copyright (C) 1995-1996
* Dave Beazley
*
* Department of Computer Science Theoretical Division (T-11)
* University of Utah Los Alamos National Laboratory
* Salt Lake City, Utah 84112 Los Alamos, New Mexico 87545
* beazley@cs.utah.edu beazley@lanl.gov
*
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
* Copyright (c) 1996
* The Regents of the University of California and the University of Utah
* All Rights Reserved
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that
* (1) The above copyright notice and the following two paragraphs
* appear in all copies of the source code and (2) redistributions
* including binaries reproduces these notices in the supporting
* documentation. Substantial modifications to this software may be
* copyrighted by their authors and need not follow the licensing terms
* described here, provided that the new terms are clearly indicated in
* all files where they apply.
*
* IN NO EVENT SHALL THE AUTHOR, THE UNIVERSITY OF CALIFORNIA, THE
* UNIVERSITY OF UTAH OR DISTRIBUTORS OF THIS SOFTWARE BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
* EVEN IF THE AUTHORS OR ANY OF THE ABOVE PARTIES HAVE BEEN ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHOR, THE UNIVERSITY OF CALIFORNIA, AND THE UNIVERSITY OF UTAH
* SPECIFICALLY DISCLAIM ANY WARRANTIES,INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
* THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE,
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
**************************************************************************/
/*******************************************************************
* Creates a GIF format file.
*
* Dave Beazley (T-11)
* August 11, 1995
*
* Rather than writing directly to files, this module fills out
* output buffer.
*
* Note : To save memory, this routine uses approximately 50K of the
* output buffer as temporary storage (for hash tables and compression codes).
* The remainder of the output buffer is used to store the final image.
* This feature allows GIF images to be created with no additional
* memory overhead.
*
* -- Revision History
* $Log$
* Revision 1.2 2003/09/01 16:23:31 beazley
* Restored the 'mojo'.
*
* Revision 1.2 1996/09/25 22:39:30 dmb
* Fixed prototypes and use of void pointers for compatibility with the Cray T3D
*
* Revision 1.1 1996/09/10 17:44:00 dmb
* Initial revision
*
* Revision 1.2 1995/08/31 14:46:07 beazley
* Minor changes to support comments and a few bug fixes.
*
*
******************************************************************/
/*
* xvgifwr.c - handles writing of GIF files. based on flgife.c and
@ -22,6 +86,8 @@
*
*/
/*****************************************************************
* Portions of this code Copyright (C) 1989 by Michael Mauldin.
* Permission is granted to use this file in whole or in
@ -344,15 +410,45 @@ static void compress(init_bits, data, len)
}
len--;
/* Uncompressed GIF */
output_GIF(ent);
code_count++;
if (code_count >= ClearCode-2) {
output_GIF(ClearCode);
code_count = 0;
fcode = (long) ( ( (long) c << maxbits) + ent);
i = (((int) c << hshift) ^ ent); /* xor hashing */
if ( HashTabOf (i) == fcode ) {
ent = CodeTabOf (i);
continue;
}
if ( (long)HashTabOf (i) < 0 ) /* empty slot */
goto nomatch;
disp = hsize_reg - i; /* secondary hash (after G. Knott) */
if ( i == 0 )
disp = 1;
probe:
if ( (i -= disp) < 0 )
i += hsize_reg;
if ( HashTabOf (i) == fcode ) {
ent = CodeTabOf (i);
continue;
}
if ( (long)HashTabOf (i) >= 0 )
goto probe;
nomatch:
output_GIF(ent);
out_count++;
ent = c;
if ( free_ent < maxmaxcode ) {
CodeTabOf (i) = free_ent++; /* code -> hashtable */
HashTabOf (i) = fcode;
}
else
cl_block();
}
/* Put out the final code */
output_GIF(ent);