Lzw.cpp

1. include <time.h>

1. include "lzw.h"

/********************************************************************

• • This program gets a file name from the command line. It compresses the

• • file, placing its output in a file named test.lzw. It then expands

• • test.lzw into test.out. Test.out should then be an exact duplicate of

• • the input file.

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

main(int argc, char *argv[])

{

clock_t timer;

CLZWCompressFile lzw;

/*

• • Get the file name, open it up, and open up the lzw output file.

• /

 if (argc==1)

 {

   printf("Input file name to compress?\n");

return 0;

 }

 printf("testing %s...\n", argv[1]);

/*

• • Compress the file.

• /

 timer = clock();

 int crunch = lzw.Compress(argv[1], "test.lzw");

 timer = clock() - timer; //CLOCKS_PER_SEC

 printf("compress time=%d ms, encoding=%d, size=%u", timer, lzw.get_bits(), crunch);

 int filesize = lzw.u_io;

 printf(" (ratio=%d%%)\n", filesize ? (filesize-crunch)*100/filesize : 0);

 if(lzw.AnyIOErrors())

printf("***I/O ERROR***\n");

/*

• • Expand the file.

• /

  timer = clock();

 int orig = lzw.Expand("test.lzw", "test.out");

 timer = clock() - timer; //CLOCKS_PER_SEC

 printf("expand time=%d ms, encoding=%d\n", timer, lzw.get_bits());

if(lzw.AnyIOErrors())

printf("***I/O ERROR***\n");

 ATLASSERT(filesize == orig); // did we mangle the file?

 return 0;

}