private static Image ExtractIcon(object iconHandler, ClassIconLocation iconLocation, bool addToCache, ref Size size)
{
Image image;
if (!GetIconFromCache(iconLocation, ref size, out image))
{
IntPtr ptr;
IntPtr ptr2;
uint num;
int num2;
IntPtr ptr3;
IntPtr ptr4;
if (size.Height >= 0x20)
{
num = (uint) (size.Height | 0x100000);
}
else
{
num = (uint) (0x20 | (size.Height << 0x10));
}
IExtractIconW nw = iconHandler as IExtractIconW;
if (nw != null)
{
num2 = nw.Extract(iconLocation.IconFileName, iconLocation.IconIndex, out ptr, out ptr2, num);
}
else
{
num2 = ((IExtractIconA) iconHandler).Extract(iconLocation.IconFileName, iconLocation.IconIndex, out ptr, out ptr2, num);
}
if (num2 != 0)
{
return null;
}
if (size.Height >= 0x20)
{
ptr3 = ptr;
ptr4 = ptr2;
}
else
{
ptr3 = ptr2;
ptr4 = ptr;
}
if (ptr3 != IntPtr.Zero)
{
image = ImageHelper.IconToBitmap(ptr3);
if (addToCache)
{
AddIconToCache(iconLocation, ref size, image);
}
Windows.DestroyIcon(ptr3);
}
if (!(ptr4 != IntPtr.Zero))
{
return image;
}
if (addToCache)
{
Image icon = ImageHelper.IconToBitmap(ptr4);
if ((icon != null) && IsIconSizeInCache(iconLocation, icon.Size))
{
icon.Dispose();
icon = null;
}
if (icon != null)
{
Size size2 = icon.Size;
AddIconToCache(iconLocation, ref size2, icon);
}
}
Windows.DestroyIcon(ptr4);
}
return image;
}
public static void LoadIconCache(Stream cacheStream)
{
BinaryReader reader = new BinaryReader(cacheStream, Encoding.UTF8);
if (new string(reader.ReadChars(4)) != "IMCH")
{
throw new InvalidDataException();
}
if (reader.ReadInt32() != 1)
{
throw new InvalidDataException("Unknown icon cache format version.");
}
lock (LocationIconCache)
{
LocationIconCache.Clear();
int num = reader.ReadInt32();
for (int i = 0; i < num; i++)
{
IconLocation location;
switch (reader.ReadByte())
{
case 0:
location = new IconLocation(reader.ReadString(), reader.ReadInt32());
break;
case 1:
{
Guid classId = new Guid(reader.ReadBytes(0x10));
location = new ClassIconLocation(ref classId, reader.ReadString(), reader.ReadInt32());
break;
}
default:
throw new InvalidDataException("Unknown icon location format.");
}
IDictionary<Size, Image> dictionary = IconCollection.Create();
int num4 = reader.ReadInt32();
for (int j = 0; j < num4; j++)
{
Size key = new Size(reader.ReadInt32(), reader.ReadInt32());
int num6 = reader.ReadInt32();
long position = cacheStream.Position;
using (Image image = Image.FromStream(new SubStream(cacheStream, FileAccess.Read, (long) num6)))
{
dictionary.Add(key, new Bitmap(image));
}
cacheStream.Position = position + num6;
}
LocationIconCache.Add(location, (dictionary.Count == 0) ? null : dictionary);
}
}
}
