Copying a font

Question

I'm trying to copy a standard font file through java and have hit a strange problem. Using the Mac finder I can select a font and move it wherever I want but programatically it fails every time.
I've tried several file copy techniques and have had no luck, the font file will be created in the destination but the size is never correct (thus corrupting the font). A friend has mentioned that all kinds of weird characters can exist in font files including EOF in random spots and I'm thinking this might somehow be related to the problem. Code is below (and common, probably found it here) but is there any other way to ensure a byte for byte copy of any file despite it's contents (assuming that's what's going on)?
        FileChannel in = new FileInputStream(src).getChannel();
        FileChannel out = new FileOutputStream(dst).getChannel();
        in.transferTo(0, in.size(), out);
        in.close();
        out.close();

Answer 1

From the Javadoc for java.nio.channels.FileChannel.transferTo(), i.e. the first place you should look:
An invocation of this method may or may not transfer all of the requested bytes
Cater for that possibility.