68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <iostream>
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#include <openssl/md5.h> /* md5sum */
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#include "../include/calibrate.hpp"
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#include "../include/exceptionhandler.hpp"
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unsigned int Calibrate::_i = 0;
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Calibrate::Calibrate(const std::string &path, const std::string &md5)
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: Generic(std::move(path)), _md5(std::move(md5)) {}
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bool Calibrate::CompareMD5(unsigned char *md5) const
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{
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/*
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* Variable initialisation
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*/
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int file_descript;
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unsigned long file_size;
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unsigned char* file_buffer;
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/* Checks if the file path can be opened. */
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file_descript = open(_path.c_str(), O_RDONLY);
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if (file_descript < 0)
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{
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throw ExceptionHandler(INVALID_PATH_ERROR, _path);
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}
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/* Grabs the size of file */
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file_size = GetSizeByFD(file_descript);
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/* Generates the buffer */
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file_buffer = static_cast<unsigned char*>(mmap(static_cast<caddr_t>(0), file_size, PROT_READ, MAP_SHARED, file_descript, 0));
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/* Computes the MD5 checksum to result */
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MD5(file_buffer, file_size, md5);
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/* Removes fime_buffer and file_size */
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munmap(file_buffer, file_size);
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MD5_wrapper md5_wrapper(md5);
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if (_md5.GetString() != md5_wrapper.GetString())
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{
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std::cout << "WARNING! " << _md5.GetString() << " != " << md5_wrapper.GetString() << "\n";
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return false;
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}
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return true;
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}
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/**
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* Get the size of the file by its file descriptor
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*
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* @param file_descript
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*/
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unsigned long Calibrate::GetSizeByFD(const int fd) const
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{
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struct stat statbuf;
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if (fstat(fd, &statbuf) < 0)
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{
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exit(EXIT_FAILURE);
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}
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return statbuf.st_size;
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}
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