I am developing a C# program that will load files and get information such as loaded file created date, modification date, size etc. Another thing that I need to know is whether the loaded file (executable.exe
) is linked with the LARGEADDRESSAWARE
flag. The FileInfo class doesn't provide this information.
Does anyone know how in C# can I find out whether a given executable.exe is linked with the LARGEADDRESSAWARE
flag (to handle addresses larger than 2 GB)?
Here is some code that checks for the Large Address Aware flag. All you have to do is pass a stream that is pointed to the start of an executable.
IsLargeAware("some.exe");
static bool IsLargeAware(string file)
{
using (var fs = File.OpenRead(file))
{
return IsLargeAware(fs);
}
}
/// <summary>
/// Checks if the stream is a MZ header and if it is large address aware
/// </summary>
/// <param name="stream">Stream to check, make sure its at the start of the MZ header</param>
/// <exception cref=""></exception>
/// <returns></returns>
static bool IsLargeAware(Stream stream)
{
const int IMAGE_FILE_LARGE_ADDRESS_AWARE = 0x20;
var br = new BinaryReader(stream);
if (br.ReadInt16() != 0x5A4D) //No MZ Header
return false;
br.BaseStream.Position = 0x3C;
var peloc = br.ReadInt32(); //Get the PE header location.
br.BaseStream.Position = peloc;
if (br.ReadInt32() != 0x4550) //No PE header
return false;
br.BaseStream.Position += 0x12;
return (br.ReadInt16() & IMAGE_FILE_LARGE_ADDRESS_AWARE) == IMAGE_FILE_LARGE_ADDRESS_AWARE;
}