block/dmg: factor out block type check
In preparation for adding bzip2 support, split the type check into a separate function. Make all offsets relative to the begin of a chunk such that it is easier to recognize the position without having to add up all offsets. Some comments are added to describe the fields. There is no functional change. Signed-off-by: NPeter Wu <peter@lekensteyn.nl> Reviewed-by: NJohn Snow <jsnow@redhat.com> Message-id: 1420566495-13284-11-git-send-email-peter@lekensteyn.nl Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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