Binary Pattern Search

Anonymous User 3066 23 Apr 2011

Hi Everyone,
I wanna search a binary file for this pattern '00 00 00 08 00' then to read 8 bytes after it into a variable.
Please help!

Ask by Anonymous User

Updated 23 Apr 2011

1 Answers

Uttam Misra 23 Apr 2011

namespace XYZ
{
    public partial class Form1 : Form {
        StringBuilder bldr = new StringBuilder();
        byte[] readFromFile;

        Regex hexPattern = new Regex("0000000800(?<binaryText>.{16})");
        MatchCollection matchBinary;
        FileStream bStream = new FileStream("C:\\XYZ.bin", FileMode.Open, FileAccess.Read);
        BinaryReader fruity;

        public Form1() {
            InitializeComponent();
            using (fruity = new BinaryReader(bStream)) {
                readFromFile = fruity.ReadBytes(31);
            }
            // create a hex-dump formatted string 
            // from the binary file input data 
            foreach (byte thisbyte in readFromFile) {
                bldr.Append(thisbyte.ToString("x2"));
            }
            // then search the hex-dump-format string for the
            // pattern he seeks. 'Capture' the eight bytes which
            // follow the pattern.
            matchBinary = hexPattern.Matches(bldr.ToString());



            // No recovery required ... just index the data bytes
            // in 'readFromFile' using the index supplied by Regex.
        }// end constructor
    }// end class Form1
}// end Namespace ‘XYZ’

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