[JAVA]Verificare semnatura

[qps1]

Verifica semnaturile de fisier(Magic number).

package org.malc0de.corejava;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Arrays;
 
/**
 *
 */
public class MagicNumberChecker {
 
    /**
     * Default Constructor
     */
    public MagicNumberChecker() {
    }
 
    public boolean verifyFileHeader(File file, int[] magicNumber) {
        try(FileInputStream fis = new FileInputStream(file)) {
            for (int i : magicNumber) {
                if (fis.read() != i) {
                    return false;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return true;
    }
 
    public boolean verifyFileHeader(File file, byte[] magicNumber) {
        try(FileInputStream fis = new FileInputStream(file)) {
            byte[] buffer = new byte[magicNumber.length];
            if(fis.read(buffer) != -1) {
                return Arrays.equals(magicNumber, buffer);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
 
    public static void main(String... strings) {
 
        final int[] SQLITE3_MAGIC_HEADER = {
                0x53, 0x51, 0x4c, 0x69, 0x74, 0x65, 0x20, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x74,
                0x20, 0x33, 0x00
        };
 
        final byte[] SQLITE3_MAGIC_HEADER2 = {
                (byte) 0x53, (byte) 0x51, (byte) 0x4c, (byte) 0x69, (byte) 0x74, (byte) 0x65,
                (byte) 0x20, (byte) 0x66, (byte) 0x6f, (byte) 0x72, (byte) 0x6d, (byte) 0x61,
                (byte) 0x74, (byte) 0x20, (byte) 0x33, (byte) 0x00
        };
 
        MagicNumberChecker mnc = new MagicNumberChecker();
 
        File file = new File(mnc.getClass().getResource("resources/test.db").getFile());
 
        if (mnc.verifyFileHeader(file, SQLITE3_MAGIC_HEADER)) {
            System.out.println("Valid Sqlite3 Database!");
        } else {
            System.out.println("Invalid Sqlite3 Database!");
        }
 
        if (mnc.verifyFileHeader(file, SQLITE3_MAGIC_HEADER2)) {
            System.out.println("Valid Sqlite3 Database!");
        } else {
            System.out.println("Invalid Sqlite3 Database!");
        }
    }
}