#include <stdio.h>

int copy_file(const char *a, const char *b)
{
    FILE *x = fopen(a, "rb");  if (!x) return -1;
    FILE *y = fopen(b, "wb");  if (!y) { fclose(x); return -1; }
    int c, n = 0;
    while ((c = fgetc(x)) != EOF)
    {
        fputc(c, y);
        n++;
    }
    fclose(x);
    fclose(y);
    return n;
}

int compress_1(const char *a, const char *b){return copy_file(a,b);}
int compress_2(const char *a, const char *b){return copy_file(a,b);}
int decompress_1(const char *a, const char *b){return copy_file(a,b);}
int decompress_2(const char *a, const char *b){return copy_file(a,b);}