MHS Existing Items 999x

#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>

#define BUFFER_SIZE (1024*1024)
char buffer[BUFFER_SIZE];

int main(int argc, char* argv[])
{
    if(argc == 2)
    {
        FILE* file;
        file = fopen(argv[1], "r");
        size_t actual_size = fread(buffer, sizeof(char), BUFFER_SIZE, file);
        printf("Read file size: %u\n", actual_size);
        fclose(file);
        for(int i = 0x10; i < 0x2ee8; i+=8)
        {
            uint16_t* idptr = (uint16_t*)(&buffer[i]);
            if(*idptr != 0)
            {
                // if there is an item ID
                // set it to max
        if(*idptr == 1227)
            break;
                printf("Setting %d from %d to 999.\n", *idptr, *(idptr+1));
                *(idptr+1) = 999;
            }

        }
        file = fopen(strcat(argv[1], "hacked"), "w");
        actual_size = fwrite(buffer, sizeof(char), actual_size, file);
        fclose(file);
        printf("Written file size: %u\n", actual_size);
    }
    else
    {
        fprintf(stderr, "Invalid arguments!\n");
    }
    return 0;
}