如何从二进制文件中删除一些第一位

Question

I've used an HEX editor to figure out that a encrypting made to a .WAV file is adding 16 blocks of empty 00's. I understood that the first 64 positions should be deleted and then the file is de-crypted. After searching the site i couldn't find an example that will match my case, I just need to open the file and write it to another file without those first 64 positions. Appreciate your help

Answer 1

If you use 64byte buffer to copy the file, than you can skip the first one:

using(var originalFile = File.OpenRead("some file"))
using(var newFile = File.OpenWrite("some file"))
{

byte[] buffer = new byte[64];

    int readBytes= 0;
    int currentReaded = 0;
    do
    {
        currentReaded = originalFile.Read(buffer, 0, buffer.Length);
        readBytes += currentReaded; 

        if(readBytes > 64)
        {
            newFile.Write(buffer, 0, currentReaded);
        }

    } while (currentReaded == buffer.Length);
}