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header.cpp
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header.cpp
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//
// Created by michal on 09.09.17.
//
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <sstream>
#include <stdio.h>
#include "header.h"
const char *magic_number = "ESET-VM2";
Header::Header() {
magic[0] = '\0';
code_size = 0;
data_size = 0;
initial_data_size = 0;
}
void Header::read_header(std::vector<char> &buffer) {
std::vector<char> header(buffer.begin(), buffer.begin() + header_length_in_bytes);
std::vector<char> header_magic_number(header.begin(), header.begin() + magic_number_length);
verify(header_magic_number);
for (int i = 0; i < header_magic_number.size(); i++) {
magic[i] = header_magic_number[i];
}
std::vector<char> header_code_size(header.begin() + magic_number_length,
header.begin() + magic_number_length + header_param_length);
code_size = extract_uint_32_value(header_code_size);
std::vector<char> header_data_size(header.begin() + magic_number_length + header_param_length,
header.begin() + magic_number_length + 2 * header_param_length);
data_size = extract_uint_32_value(header_data_size);
std::vector<char> header_initial_data_size(header.begin() + magic_number_length + 2 * header_param_length,
header.begin() + magic_number_length + 3 * header_param_length);
initial_data_size = extract_uint_32_value(header_initial_data_size);
}
void Header::verify(std::vector<char> &buffer) {
char *buffer_char = buffer.data();
buffer_char[8] = '\0';
if (strcmp(buffer_char, magic_number) != 0) {
fprintf(stderr, "You did not provide EVM file.\n");
exit(1);
}
}
uint32_t Header::extract_uint_32_value(std::vector<char> &buffer) {
char *buffer_char = buffer.data();
buffer_char[4] = '\0';
uint32_t int_value;
int_value = (uint32_t) (buffer_char[3] << 24) | (buffer_char[2] << 16) | (buffer_char[1] << 8) | buffer_char[0];
return int_value;
}
uint32_t Header::get_data_size() {
return data_size;
}
int Header::get_size_of_file() {
return sizeof(Header) + initial_data_size + code_size;
}
uint32_t Header::get_initial_data_size() {
return initial_data_size;
}