# File lib/ole/storage/base.rb, line 105 def load # we always read 512 for the header block. if the block size ends up being different, # what happens to the 109 fat entries. are there more/less entries? @io.rewind header_block = @io.read 512 @header = Header.new header_block # create an empty bbat. @bbat = AllocationTable::Big.new self bbat_chain = header_block[Header::SIZE..-1].unpack 'V*' mbat_block = @header.mbat_start @header.num_mbat.times do blocks = @bbat.read([mbat_block]).unpack 'V*' mbat_block = blocks.pop bbat_chain += blocks end # am i using num_bat in the right way? @bbat.load @bbat.read(bbat_chain[0, @header.num_bat]) # get block chain for directories, read it, then split it into chunks and load the # directory entries. semantics changed - used to cut at first dir where dir.type == 0 @dirents = @bbat.read(@header.dirent_start).to_enum(:each_chunk, Dirent::SIZE). map { |str| Dirent.new self, str } # now reorder from flat into a tree # links are stored in some kind of balanced binary tree # check that everything is visited at least, and at most once # similarly with the blocks of the file. # was thinking of moving this to Dirent.to_tree instead. class << @dirents def to_tree idx=0 return [] if idx == Dirent::EOT d = self[idx] d.children = to_tree d.child raise FormatError, "directory #{d.inspect} used twice" if d.idx d.idx = idx to_tree(d.prev) + [d] + to_tree(d.next) end end @root = @dirents.to_tree.first @dirents.reject! { |d| d.type_id == 0 } # silence this warning by default, its not really important (issue #5). # fairly common one appears to be "R" (from office OS X?) which smells # like some kind of UTF16 snafu, but scottwillson also has had some kanji... #Log.warn "root name was #{@root.name.inspect}" unless @root.name == 'Root Entry' unused = @dirents.reject(&:idx).length Log.warn "#{unused} unused directories" if unused > 0 # FIXME i don't currently use @header.num_sbat which i should # hmm. nor do i write it. it means what exactly again? # which mode to use here? @sb_file = RangesIOResizeable.new @bbat, :first_block => @root.first_block, :size => @root.size @sbat = AllocationTable::Small.new self @sbat.load @bbat.read(@header.sbat_start) end