/*
 * CS 261 PA1: Mini-ELF header verifier
 *
 * Name: Nicholas Tamassia
 */

#include "p1-check.h"

/**********************************************************************
 *                         REQUIRED FUNCTIONS
 *********************************************************************/

bool read_header (FILE *file, elf_hdr_t *hdr)
{
    if (!file || !hdr) {
        return false;
    }

    return ((fread(hdr, sizeof(elf_hdr_t), 1, file) == 1) && hdr->magic == 0x00464c45);
}

/**********************************************************************
 *                         OPTIONAL FUNCTIONS
 *********************************************************************/

void dump_header (elf_hdr_t *hdr)
{
    uint8_t *byte_arr = (uint8_t*)hdr;
    size_t size = sizeof(elf_hdr_t) / sizeof(byte_arr[0]);

    for (int i = 0; i < size; i++) {
        printf("%02x", byte_arr[i]);

        if (i != size - 1) {
            printf(" ");
        }   

        if (i == size / 2 - 1) {
            printf(" ");
        }
    }
    printf("\n");

    printf("Mini-ELF version %d\n", hdr->e_version);
    printf("Entry point 0x%03x\n", hdr->e_entry);
    printf("There are %d program headers, starting at offset %d (0x%02x)\n", hdr->e_num_phdr, hdr->e_phdr_start, hdr->e_phdr_start);

    if (hdr->e_symtab != 0) {
        printf("There is a symbol table starting at offset %d (0x%02x)\n", hdr->e_symtab, hdr->e_symtab);
    } else {
        printf("There is no symbol table present\n");
    }

    if (hdr->e_strtab != 0) {
        printf("There is a string table starting at offset %d (0x%02x)\n", hdr->e_strtab, hdr->e_strtab);
    } else {
        printf("There is no string table present\n");
    }
}