changes

PDF417编码的算法的源程序

/* This work is based somewhat on the pdf417_enc code written by */
/*              Ian Goldberg at UC-Berkeley */
/*                                        */
/* Authors: John Lien ([e-mail]) */
/*          Laszlo Agoston   [e-mail] */
/*          Tom Tollenaere  [e-mail] (gif output routines )  */
/*     Useful examples provided by "Tom Tollenaere" [e-mail]  */
/*
           
   Revisions:  1.0    4/18/00     Initial release   
   Revisions:  1.1    4/31/00     Added code to support differenct error   
                                  correction levels                        
   Revisions:  1.2    6/08/00     Fixed the PBM output file                
   Revisions:  1.3    11/28/00    Fixed overrun problem found by Laszlo    
                                  Combined get_cvalue and get_ctype         
                                   Routines (per Laszlo )                  
                                  Fixed problems with byte_compress        
                                     remainder > 900 should be             
                                     remainder > 899                       
                                   Also in numeric compress                
                                     fix b900_result[mm] > 900              
                                   Should be b900_result[mm] > 899         
   Revisions:  1.4    12/6/00    Add code to do \NL \CR \LF in text compress  
   Revisions:  1.5    12/7/00    Fix problem with 901 code at beginning   
                                    and default to text compress mode     
                                 Fix problem in do_row_begin and          
                                    do_row_end.  Number of columns        
                                    was wrong for right indicator         
                                    and left indicator :                  
                                  Rewrote the text_compress to work       
                                    better.                               
                                                                          
   Revisions:  1.6    12/8/00    Fixed more problems with text_compress    
                                  Folded in Tom Tollenaere gif output code   
                                  Update Makefile                           
   Revisions:  1.7    3/13/01    Fixed problem with PDF417_STOP    
                                  Submitted by "nobody" at sourceforge      
                                                                            
   Revisions:  1.8    5/17/01    Fixed problem switching between            
                                  text compress and byte compact mode       
                                  Found by Chris Cowan and Ray Sweeney      
   Revisions:  1.9    6/17/01    Added 900 pads for case when number        
                                  codewords used for message plus           
                                  Error Codewords < row * cols -2           
                                 also error if number of codewords is too   
                              large. Thanks to Frederic Ramanaga for this   
                                  Added test for ecc syndromes to make      
                                  sure ecc is calculated correctly          
                                  Also, added Reed Solomon Decoder          
                                  Code from Phil Karns rs.c                 
                                  (Not debugged yet...)                     
   Revisions:  2.0    10/12/01    Reed Solomon Decoder success              
                                  if test_ecc is turned on, ecc can         
                                  now be decoded!!!!                        
                                  Checked up to four errors corrected       
                                  at a time                                 
   Revisions:  2.1    10/21/01    Fix problems with rows = 999              
                                  and postscript output                     
                                  Thanks to Jeff Chua                       
   Revisions:  2.2    10/24/01    Fix problems with rows = 999              
                                  and postscript output, added top and      
                                  bottom clear space to postscript out      
   Revisions:  2.3    11/04/01    Fix problems with rows = 999              
                                  Added better command line handling        
                                  submitted by Andrew Baker                 
   Revisions:  2.4    11/21/01    Fixes for easier Virtual C++ compile      
                                  Thanks to Chris Wille                     
                                  New pdf417_en function that does most     
                                  of the work                               
   Revisions:  2.5    11/30/01    Fixes for problems with text compress     
                                  found by Tomas Gruszewski     
                                                                            
   Revisions:  2.6    12/11/01    Made stdout default output for ps, pbm    
                                  Added -t psbits for ps bitmap only        
                                  Made the in_data lines wider              
                                  All to make this easier to use as         
                                   as a printer filter.                     
                                  Changes due to Stephan Leemburg           
                                  Also,    Raod Plank had some fixes to     
                                  allow input lines > 256, also as a fix    
                                  to the nc routine                         
   Revisions:  2.7    12/19/01    Removed some dead code from generateEC   
                                  routine.                                  
                                  Commented out some code in eras_dec_rs    
                                  that caused some problems when using      
                                  erasures.                                 
   Revision    2.8    10/25/02    No changes, just added the scan           
                                      binary to decode the generated        
                                      barcode                               
   Revision    3.1    4/13/03     Fixed a bug in PDF417_encodeGIF           
                                    Found by Dash Wendrzyk                  
   Revision    3.2    6/06/03     Added a makefile for freeBSD and          
                                   code in main.c for bsd compilation       
                                    Thanks to Ken Marx                      
   Revision    3.3    7/04/03     Added code to demonstrate usage as        
                                     a callable shared library              
                                   lib_test.c   is an example of a          
                                    program calling the library functions   
                                   pdf417.h is the include used by caller   
                                   make lib     will make libary            
                                                                            
   Revision    3.4    9/01/03     Fixed some errors in the pdf417_dec      
                                   program.       
                                                                            
   Revision    3.5   10/14/03     Fixed bug in get_line that changes HT     
                                  ( Horizontal Tab) to Space                
                                  Added code to allow double quotes         
                                   in TC ( text compress) using \DQ         
                                  Added the code written by Vladislav       
                                   Naumov with help from Paulo Soares      
                                    to allow support for Macro PDF          
                                  you can now have a line such as           
                                   MC "FILE ID  XXXXX Segment 2/2"          
                                  That specified a macro pdf file id       
                                  and macro pdf segment index.  This       
                                  must be the last line of input file      
                                  Also fixed bug in text_compress that     
                                 failed for puctuation followed by space   
                                  Vladislav Naumov wrote a better Makefile.
                                       
                                            
   Revision    3.6   11/30/03     Added Borland subdirectory of code
                                  for Borland C++ due to Robert Grobau
                                  of U.S. Navy.  Added support for
                                  stdin file and stdout file ( just
                                  replace normal file name with _ )

                                                                          
                                            
   Revision    3.7   3/05/04      Fixed problem in ecc table for
                                  level 6 and above ecc found by
                                  Horvath Gabor.
                                  Added tests for level 6 ecc in 
                                  tests.c
           
   Revision    3.8   4/26/04      Added source code for the pdf417_dec
                                  program ( frontend.c ) in the scan_src
                                  directory.

           
   Revision    3.9   9/01/04      Fix extra plus problem found by arthurdent99
                                  Updated the pdf417_dec to work with netpbm
                                  v10.  Also fixed some minor bugs in 
                                  pdf417_dec, added some array bounds checking
                                  etc.

           
   Revision    4.0    10/22/04      Added contributions by Huver at amgraf.com
                                  These include better treatment of quiet
                                  zone around the barcode, ability to
                                  specify bar width in mils, and row height
                                  as a function of bar width, and quiet zone
                                  width.  Also, a -h and a better command
                                  line interface.

   Revision    4.1   1/30/05        Added changes to numerical compact
                                  and nc routines that resulted in debug
                                  information being printed on stdout.
                                  This was found by Mark Brand.   I also
                                  added Mark Brand's code for the annex p
                                  pdf417 pre_processor.