public static IconInjector.IconFile FromFile(string filename)
{
IconInjector.IconFile iconFile = new IconInjector.IconFile();
byte[] numArray = File.ReadAllBytes(filename);
GCHandle gcHandle = GCHandle.Alloc((object)numArray, GCHandleType.Pinned);
iconFile.iconDir = (IconInjector.ICONDIR)Marshal.PtrToStructure(gcHandle.AddrOfPinnedObject(), typeof(IconInjector.ICONDIR));
iconFile.iconEntry = new IconInjector.ICONDIRENTRY[checked ((int)iconFile.iconDir.Count - 1 + 1)];
iconFile.iconImage = new byte[checked ((int)iconFile.iconDir.Count - 1 + 1)][];
int num1 = Marshal.SizeOf((object)iconFile.iconDir);
Type type = typeof(IconInjector.ICONDIRENTRY);
int num2 = Marshal.SizeOf(type);
int num3 = 0;
int num4 = checked ((int)iconFile.iconDir.Count - 1);
int index = num3;
while (index <= num4)
{
IconInjector.ICONDIRENTRY icondirentry = (IconInjector.ICONDIRENTRY)Marshal.PtrToStructure(new IntPtr(checked (gcHandle.AddrOfPinnedObject().ToInt64() + (long)num1)), type);
iconFile.iconEntry[index] = icondirentry;
iconFile.iconImage[index] = new byte[checked (icondirentry.BytesInRes - 1 + 1)];
Buffer.BlockCopy((Array)numArray, icondirentry.ImageOffset, (Array)iconFile.iconImage[index], 0, icondirentry.BytesInRes);
checked { num1 += num2; }
checked { ++index; }
}
gcHandle.Free();
return(iconFile);
}
public static void InjectIcon(string exeFileName, string iconFileName, uint iconGroupID, uint iconBaseID)
{
IconInjector.IconFile iconFile = IconInjector.IconFile.FromFile(iconFileName);
IntPtr hUpdate1 = IconInjector.NativeMethods.BeginUpdateResource(exeFileName, false);
byte[] iconGroupData = iconFile.CreateIconGroupData(iconBaseID);
IntPtr hUpdate2 = hUpdate1;
IntPtr num1 = new IntPtr(14L);
IntPtr type1 = num1;
IntPtr num2 = new IntPtr((long)iconGroupID);
IntPtr name1 = num2;
int num3 = 0;
byte[] data1 = iconGroupData;
int length1 = iconGroupData.Length;
IconInjector.NativeMethods.UpdateResource(hUpdate2, type1, name1, (short)num3, data1, length1);
int num4 = 0;
int num5 = checked (iconFile.ImageCount - 1);
int index = num4;
while (index <= num5)
{
byte[] numArray = iconFile.get_ImageData(index);
IntPtr hUpdate3 = hUpdate1;
num2 = new IntPtr(3L);
IntPtr type2 = num2;
num1 = new IntPtr(checked ((long)iconBaseID + (long)index));
IntPtr name2 = num1;
int num6 = 0;
byte[] data2 = numArray;
int length2 = numArray.Length;
IconInjector.NativeMethods.UpdateResource(hUpdate3, type2, name2, (short)num6, data2, length2);
checked { ++index; }
}
IconInjector.NativeMethods.EndUpdateResource(hUpdate1, false);
}