Gets the number of lines in the new file.
Gets the starting line number in the new file.
Gets the number of lines in the old file.
Gets the starting line number in the old file.
Atomically increments the reference count of hunk
by one.
This function is MT-safe and may be called from any thread.
Atomically decrements the reference count of hunk
by one.
If the reference count drops to 0, hunk
is freed.
Represents the hunk of a diff.