Read file/stream

[nrgyzer]

I'm trying to read a png file and I'm having some trouble with the
chunk-size. Each chunk of a png file begins with a 4 byte (unsigned)
integer. When I read this 4 byte integer (uint) I get an absolutely
incorrect length. My code currently looks like:

void main(string args) {

   File f = new File("test.png", FileMode.In);

   // png signature
   ubyte[8] buffer;
   f.read(buffer);

   // first chunk (IHDR)
   uint size;
   f.read(size);

   f.close();
}

When I run my code, I get 218103808 instead of 13 (decimal) or 0x0D
(hex). When I try to read the 4 byte integer as a ubyte[4]-array, I
get [0, 0, 0, 13] where 13 seems to be the correct ones because my
hex-editor says [0x00 0x00 0x00 0x0D] for these 4 bytes.

I hope anyone know where my mistake is. Thanks!