/// <summary>
/// Identifying method for JFIF/JPEG/JPG
/// </summary>
/// <param name="filename">fiel name</param>
/// <returns>identified sig</returns>
public static FASignature IdentifyJPEG(string filename)
{
string buffer = File.ReadAllText(filename);
int index = BoyerMooreString.IndexOf(buffer, "JFIF");//jfif files have a section with an ASCII JFIF\0 that will identify it.
//most JPGs conform to the JFIF standard
if (index != -1)
{
Console.WriteLine(index);
return(new FASignature("FF D8 FF E0", "JFIF", 0, "JPEG File Interchange Format is an image file format standard"));
}
return(new FASignature("FF D8 FF E0", "JPEG", 0, "JPEG/JPG Image Format"));
}
/// <summary>
/// primitive scanner using boyer moore to identify something.
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
private static bool TestTSQL(string filename)
{
string[] tsql_keywords = { "SELECT", "FROM", "WHERE", "ORDER BY", "GROUP BY", "HAVING" }; //simple example of keywords
string text = File.ReadAllText(filename);
int count = 0, threshold = 6;
foreach (string keyword in tsql_keywords)
{
if (BoyerMooreString.IndexOf(text, keyword) > -1)
{
count++;
}
}
if (count > threshold)
{
Console.WriteLine("Possible TSQL File!");
return(true);
}
return(false);
}