#include <stdio.h>
#include <stdbool.h>
#include <string.h> 
#include <stdlib.h> 

#include <inflate.h>

void truncate_suffix(char *fname) {
    char *dot = strrchr(fname, '.'); 

    const char *suffix = ".deflate";

    for (int i = 0; i < 8; i++) {
        if (dot == NULL || *(dot + i) != suffix[i]) { 
            fprintf(stderr, "error: must be a .deflate file\n"); 
            exit(1);
        }
    }
    *dot = '\0';
}

int main(int argc, char *argv[]) { 
    if (argc != 2) {
        fprintf(stderr, "usage: inflate [file]\n");
        return 1;
    }
    
    char *fname = argv[1];

    FILE *fp = fopen(fname, "rb");
        
    if (!fp) {
        fprintf(stderr, "error: file not found\n");
        return 1;
    }
    
    fseek(fp, 0, SEEK_END); 
    long size = ftell(fp); 
    rewind(fp); 

    truncate_suffix(fname);     
    inflate(fp, size, fname);

    fclose(fp);
    return 0;
}