* gnu/java/nio/FileChannelImpl.java
	(lengthInternal): Must be native.
	(size): Check if channel is already closed.
	(implCloseChannel): Reformated.
	(read): w was unused, removed it.
	(read): Removed.
	(read): New method.
	(write): New method.
	(map): Check arguments.
	(force): Throws IOException, check if channel is closed.
	(transferTo): New method.
	(transferFrom): New method.
	(lock): New method.
	(tryLock): New method.
	(position): New method.
	(truncate): New method.
	(nio_mmap_file): Uncommented.
	(nio_munmap_file): Uncommented.
	(nio_msync): Uncommented.
	* gnu/java/nio/natFileChannelImpl.cc: New file.

From-SVN: r62841