An antivirus program is a special application that detects malicious files and viruses that harm your computer. If you have programming skills, then you can write an anti-virus application yourself.
Instructions
Step 1
Create basic structures for building your own antivirus. They will be used both by the program for creating the anti-virus database and by the scanner. First, declare the structures you want. The first is the signature structure. The next one is a record structure that combines a signature and a name. Include the function of allocating memory for the name of the virus in it. Place both structures in a header file.
Step 2
Write a class for working with anti-virus database files. You will need to create a few classes: the base file class, the file reader class, and the write add class. Declare these classes in the CAVBFile.h file. Place the implementation of the classes in the AVBFile.cpp file. Include the header file. You also need to add a check for the existence of the file. Then implement the class functions for writing to the file.
Step 3
Implement the following algorithm: if a file is opened and it is not found, then a new file will be created, a header will be written to it. If the file exists, the signature will be checked and the number of records will be read. Add the addRecord function here, which will take a reference to the record structure as a parameter. Move the entry to the end of the file. After that, it is necessary to increase the record counter.
Step 4
Implement a program to create an anti-virus program database. Use the path to the virus file and the database as its parameters, as well as change the sequence in the virus file and its name. Use passing arguments in the format A [Value], where A is the corresponding key, Value is the value. Write down the following algorithm for the program's action: open the malware file, navigate by offset, calculate the hash, and add an entry to the database. Place the program code in the avrec.cpp file.
Step 5
Write down the scanner code that will check the file for malware. Place the file with the base in the same folder with the base and name it avbase.avb. Use the following work algorithm to create an anti-virus scanner: download a database file, get a list of files, scan a file.
