//
//  hexdump.c
//  darksword-kexploit-fun
//
//  Created by seo on 3/26/26.
//

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

#include "hexdump.h"


void hexdump(const void* data, size_t size) {
    char ascii[17];
    size_t i, j;
    ascii[16] = '\0';
    for (i = 0; i < size; ++i) {
        if ((i % 16) == 0)
        {
            printf("[0x%016llx+0x%03zx] ", &data, i);
        }

        printf("%02X ", ((unsigned char*)data)[i]);
        if (((unsigned char*)data)[i] >= ' ' && ((unsigned char*)data)[i] <= '~') {
            ascii[i % 16] = ((unsigned char*)data)[i];
        }
        else
            ascii[i % 16] = '.';

        if ((i + 1) % 8 == 0 || i + 1 == size) {
            printf(" ");
            if ((i + 1) % 16 == 0)
                printf("|  %s \n", ascii);
            else if (i + 1 == size) {
                ascii[(i + 1) % 16] = '\0';
                if ((i + 1) % 16 <= 8) {
                    printf(" ");
                }
                for (j = (i + 1) % 16; j < 16; ++j)
                    printf("   ");

                printf("|  %s \n", ascii);
            }
        }
    }
}

void hexdump_file(const char *path, size_t size)
{
    int fd = open(path, O_RDONLY);
    void *buf = malloc(size);
    ssize_t n = read(fd, buf, size);
    close(fd);
    if (n > 0)
        hexdump(buf, n);
    free(buf);
}