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Contents
##
# $Id: minifat.rb 8457 2010-02-11 18:36:38Z jduck $
# Version: $Revision: 8457 $
##
##
# Rex::OLE - an OLE implementation
# written in 2010 by Joshua J. Drake <jduck [at] metasploit.com>
##
module Rex
module OLE
class MiniFAT < DIFAT
#
# low-level functions
#
def read
@entries = []
visited = []
sect = @stg.header._sectMiniFatStart
@stg.header._csectMiniFat.times { |idx|
break if sect == SECT_END
if (visited.include?(sect))
raise RuntimeError, 'Sector chain loop detected (0x%08x)' % sect
end
visited << sect
buf = @stg.read_sector(sect, @stg.header.sector_size)
@stg.header.idx_per_sect.times { |idx|
@entries << Util.get32(buf, (idx*4))
}
sect = @stg.next_sector(sect)
}
end
def allocate_sector
idx = @entries.index(SECT_FREE)
if (not idx)
# add a sector worth
idx = @entries.length
@stg.header.idx_per_sect.times {
@entries << SECT_FREE
}
end
# default mini-sectors to end of chain
@entries[idx] = SECT_END
idx
end
def write
return if (@entries.length < 1)
mf_start = nil
mfs_count = 0
prev_sect = nil
copy = @entries.dup
while (copy.length > 0)
part = copy.slice!(0, @stg.header.idx_per_sect)
sbuf = Util.pack32array(part)
idx = @stg.write_sector(sbuf, nil, prev_sect)
mfs_count += 1
mf_start ||= idx
end
@stg.header._sectMiniFatStart = mf_start
@stg.header._csectMiniFat = mfs_count
end
end
end
end
Version data entries
43 entries across 43 versions & 1 rubygems