Question

I am trying to determine whether or not a file has been compressed with the GZip protocol.

The consensus seems to be that I need to read the first two bytes of the file, and check that they are equal to 0x1f8b. I have just learned that this is known as a magic number.

How do I, preferably using .Net/C# as this is what I am used to, read the individual bytes of a file?

Thankyou

Answer 1

you could try this…

you might need to use a different variable type for v or you could convert the int…

using (BinaryReader b = new BinaryReader(File.Open("file.bin", FileMode.Open)))
{
    int v = b.ReadByte();
    Console.WriteLine(v);
}