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/***************************************************************************
* Sample Program Using LZW Encoding Library
*
* File : sample.c
* Purpose : Demonstrate usage of LZW encoding library
* Author : Michael Dipperstein
* Date : January 30, 2005
*
****************************************************************************
* UPDATES
*
* $Id: sample.c,v 1.4 2007/09/29 01:28:27 michael Exp $
* $Log: sample.c,v $
* Revision 1.4 2007/09/29 01:28:27 michael
* Replace getopt with optlist.
* Changes required for LGPL v3.
*
* Revision 1.3 2005/03/27 21:10:22 michael
* Update e-mail address in copyright notice.
*
* Revision 1.2 2005/02/21 03:52:06 michael
* Correct comments in headers.
*
* Revision 1.1.1.1 2005/02/21 03:35:34 michael
* Initial Release
*
****************************************************************************
*
* SAMPLE: Sample usage of Lempel-Ziv-Welch Encoding Library
* Copyright (C) 2005, 2007 by
* Michael Dipperstein (mdipper@alumni.engr.ucsb.edu)
*
* This file is part of the lzw library.
*
* The lzw library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* The lzw library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
***************************************************************************/
/***************************************************************************
* INCLUDED FILES
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "optlist.h"
#include "lzw.h"
/***************************************************************************
* PROTOTYPES
***************************************************************************/
char *RemovePath(char *fullPath);
/***************************************************************************
* FUNCTIONS
***************************************************************************/
/****************************************************************************
* Function : main
* Description: This is the main function for this program, it validates
* the command line input and, if valid, it will call
* functions to encode or decode a file using the lzw
* coding algorithm.
* Parameters : argc - number of parameters
* argv - parameter list
* Effects : Encodes/Decodes input file
* Returned : EXIT_SUCCESS for success, otherwise EXIT_FAILURE.
****************************************************************************/
int main(int argc, char *argv[])
{
option_t *optList, *thisOpt;
char *inFile, *outFile; /* name of input & output files */
char encode; /* encode/decode */
/* initialize data */
inFile = NULL;
outFile = NULL;
encode = TRUE;
/* parse command line */
optList = GetOptList(argc, argv, "cdi:o:h?");
thisOpt = optList;
while (thisOpt != NULL)
{
switch(thisOpt->option)
{
case 'c': /* compression mode */
encode = TRUE;
break;
case 'd': /* decompression mode */
encode = FALSE;
break;
case 'i': /* input file name */
if (inFile != NULL)
{
fprintf(stderr, "Multiple input files not allowed.\n");
free(inFile);
if (outFile != NULL)
{
free(outFile);
}
FreeOptList(optList);
exit(EXIT_FAILURE);
}
else if ((inFile =
(char *)malloc(strlen(thisOpt->argument) + 1)) == NULL)
{
perror("Memory allocation");
if (outFile != NULL)
{
free(outFile);
}
FreeOptList(optList);
exit(EXIT_FAILURE);
}
strcpy(inFile, thisOpt->argument);
break;
case 'o': /* output file name */
if (outFile != NULL)
{
fprintf(stderr, "Multiple output files not allowed.\n");
free(outFile);
if (inFile != NULL)
{
free(inFile);
}
FreeOptList(optList);
exit(EXIT_FAILURE);
}
else if ((outFile =
(char *)malloc(strlen(thisOpt->argument) + 1)) == NULL)
{
perror("Memory allocation");
if (inFile != NULL)
{
free(inFile);
}
FreeOptList(optList);
exit(EXIT_FAILURE);
}
strcpy(outFile, thisOpt->argument);
break;
case 'h':
case '?':
printf("Usage: %s <options>\n\n", RemovePath(argv[0]));
printf("options:\n");
printf(" -c : Encode input file to output file.\n");
printf(" -d : Decode input file to output file.\n");
printf(" -i <filename> : Name of input file.\n");
printf(" -o <filename> : Name of output file.\n");
printf(" -h | ? : Print out command line options.\n\n");
printf("Default: %s -c\n", RemovePath(argv[0]));
FreeOptList(optList);
return(EXIT_SUCCESS);
}
optList = thisOpt->next;
free(thisOpt);
thisOpt = optList;
}
/* validate command line */
if (inFile == NULL)
{
fprintf(stderr, "Input file must be provided\n");
fprintf(stderr, "Enter \"%s -?\" for help.\n", RemovePath(argv[0]));
if (outFile != NULL)
{
free(outFile);
}
exit (EXIT_FAILURE);
}
else if (outFile == NULL)
{
fprintf(stderr, "Output file must be provided\n");
fprintf(stderr, "Enter \"%s -?\" for help.\n", RemovePath(argv[0]));
if (inFile != NULL)
{
free(inFile);
}
exit (EXIT_FAILURE);
}
/* we have valid parameters encode or decode */
if (encode)
{
LZWEncodeFile(inFile, outFile);
}
else
{
LZWDecodeFile(inFile, outFile);
}
free(inFile);
free(outFile);
return EXIT_SUCCESS;
}
/****************************************************************************
* Function : RemovePath
* Description: This is function accepts a pointer to the name of a file
* along with path information and returns a pointer to the
* character that is not part of the path.
* Parameters : fullPath - pointer to an array of characters containing
* a file name and possible path modifiers.
* Effects : None
* Returned : Returns a pointer to the first character after any path
* information.
****************************************************************************/
char *RemovePath(char *fullPath)
{
int i;
char *start, *tmp; /* start of file name */
const char delim[3] = {'\\', '/', ':'}; /* path deliminators */
start = fullPath;
/* find the first character after all file path delimiters */
for (i = 0; i < 3; i++)
{
tmp = strrchr(start, delim[i]);
if (tmp != NULL)
{
start = tmp + 1;
}
}
return start;
}
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