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| #include "utypes.h"
#include "gtbitio.h"
#include "sf.h"
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
typedef struct
{
char algorithm[4];
ulong file_size;
} file_stamp;
sffreq_type freq;
char filename_in[256];
char filename_out[256];
FILE *in, *out;
file_stamp fstamp;
ulong in_file_len, out_file_len;
ulong i_file_size = 0;
#define IN_BUFSIZE 4096
char input_buf[ IN_BUFSIZE ];
uint nread = 0, in_i = 0;
void read_stats ( FILE *in, sffreq_type *sffreq );
void get_name(void);
int main(void)
{
unsigned int c = 0;
char ch;
time_t start, end;
//clrscr();
printf("\n\t Fano-arh.programm.");
printf("\n\t what are you want?");
printf("\n\t\t 1.Compress file");
printf("\n\t\t 2.DeCompress file\n");
printf("\n\t Enter your choise: ");
ch = getc(stdin);
printf("\n");
switch(ch)
{
case '1':
{
get_name();
start=time(NULL);
gIN=in;
pOUT=out;
init_put_buffer();
fprintf(stderr, "\n--( A Static *Shannon-Fano* Coding Implementation )--\n");
fprintf(stderr, "\nName of input file : %s", filename_in);
fseek( in, 0, SEEK_END );
in_file_len = ftell( in );
fprintf(stderr, "\nLength of input file = %15lu bytes", in_file_len );
init_sffreq();
fprintf(stderr, "\n\nAnalyzing file...");
read_stats( in, sffreq );
fprintf(stderr, "complete.");
fprintf(stderr, "\nShannon-Fano Compressing...");
init_sflist();
create_symbol_list();
top = create_node();
top->next = list;
create_shannon_fano_tree( top );
rewind( pOUT );
strcpy( fstamp.algorithm, "TSF" );
fstamp.file_size = in_file_len;
fwrite( &fstamp, sizeof(file_stamp), 1, out );
fwrite( &sfcount, sizeof(unsigned int), 1, out );
for ( c = 0; c < SF_MAX; c++ )
{
if ( sffreq[c].f > 0 )
{
fwrite( &sffreq[c], sizeof(sffreq_type), 1, out );
}
}
rewind(in);
while( true )
{
nread = fread( input_buf, 1, IN_BUFSIZE, in );
if ( nread == 0 ) break;
in_i = 0;
while( in_i < nread )
{
c = (uchar) *(input_buf+in_i);
++in_i;
sfcompress( sflist[c] );
}
}
flush_put_buffer(); /* flush output buffer */
fprintf(stderr, "complete.");
out_file_len = ftell( out );
end=time(NULL);
fprintf(stderr, "\n\nName of output file: %s", filename_out);
fprintf(stderr, "\nLength of input file = %15lu bytes", in_file_len );
fprintf(stderr, "\nLength of output file = %15lu bytes", out_file_len );
fprintf(stderr, "\nCompression ratio: %15.2f %%\n",
( ((float) in_file_len - (float) out_file_len) / (float) in_file_len
) * (float) 100 );
fprintf(stderr, "\nCompress time = %f Second", difftime(end,start));
//halt_prog:
getchar();
}break;
case '2':
{
get_name();
start=time(NULL);
gIN=in;
fread( &fstamp, sizeof(file_stamp), 1, in );
init_sffreq();
fread( &sfcount, sizeof(int), 1, in );
for ( c = 0; c < sfcount; c++ )
{
fread( &freq, sizeof(sffreq_type), 1, in );
sffreq[ (unsigned char) freq.b ] = freq;
}
init_sflist();
create_symbol_list();
top = create_node();
top->next = list;
create_shannon_fano_tree( top );
init_get_buffer();
fprintf(stderr, "\n Name of input file : %s", filename_in );
fprintf(stderr, "\n Decompressing...");
rewind( out );
for ( i_file_size = fstamp.file_size; i_file_size; i_file_size-- )
{
c = sfdecompress( top );
fputc( (uchar) c, out );
}
fprintf(stderr, "complete.\n");
end=time(NULL);
fprintf(stderr, "\n Name of output file : %s\n", filename_out );
fprintf(stderr, "\n Decompress time = %f second\n", difftime(end,start));
getchar() ;
}break;
default:
{
printf("\n\tError - You enter bad number");
getchar() ;
} break;
}
free_put_buffer();
if ( in ) fclose( in );
if ( out ) fclose( out );
return 0;
}
void get_name(void)
{
int i=0;
for(i=0;i<256;i++)
{
filename_in[i]=filename_out[i]=0;
}
printf("Enter name of input file: ");
//gets(filename_in);
scanf("%s",filename_in);
if ( (in = fopen( filename_in, "rb" )) == NULL )
{
fprintf(stderr, "\n\tError opening input file.");
getchar();
exit(0);
}
printf("\n\tEnter name of output file: ");
// gets(filename_out);
scanf("%s",filename_out);
if ( (out = fopen( filename_out, "wb" )) == NULL )
{
fprintf(stderr, "\n\tError opening output file.");
getchar();
exit(0);
}
}
void read_stats( FILE *in, sffreq_type *sffreq )
{
int c;
rewind(in);
while ( (c=fgetc(in)) != EOF ) {
sffreq[ c ].f++;
}
} |
(
