:* <3

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

char *load_file(char* filename)
{
    FILE *input = fopen(filename, "rb");
    if (input == NULL)
        return NULL;
    fseek(input, 0, SEEK_END);
    unsigned int lenght = ftell(input) + 1;
    fseek(input, 0, SEEK_SET);
    char *output = malloc(sizeof(int) * lenght);
    if(fgets(output, lenght, input) == NULL) {
        free(output);
        fclose(input);
        return NULL;
    }
    fclose(input);
    return output;
}

int main(int argc, char *argv[])
{
    int was_f = -1, file = -1;
    bool md5 = false, c16 = false, c32 = false, xorr = false;
    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-md5") == 0)
            md5 = true;
        else if (strcmp(argv[i], "-c16") == 0)
            c16 = true;
        else if (strcmp(argv[i], "-c32") == 0)
            c32 = true;
        else if (strcmp(argv[i], "-xor") == 0)
            xorr = true;
        //else if (argv[i] == "-hex")
        else if (strcmp(argv[i], "-f") == 0)
            was_f = 0;
        else {
            if (was_f == 1) {
                file = i;
                was_f = -1;
            }
        }
        if (was_f != -1)
            was_f++;
    }
    if (file > -1) {
        unsigned char *input = (unsigned char) load_file(argv[file]);
        if (!input) {
            printf("problem");
            return 1;
        }
        if (c16) {
            crc16_context hashc16;
            crc16_init(&hashc16);
            for (size_t i = 0; i < strlen(input); i++) {
                crc16_update(&hashc16, input[i]);
            }
            printf("%04x", hashc16.crc);
        }
        if (md5) {
            MD5_CTX hashmd5;
            unsigned char *result;
            MD5_Init(&hashmd5);
            for (size_t i = 0; i < strlen(input); i++) {
                MD5_Update(&hashmd5, input[i], sizeof(char));
            }
            MD5_Final(result, &hashmd5);
            printf("%s", result);
        }
    } else if (was_f > -1) {
        printf("ERROR");
        return 1;
    }
    return 0;
}