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Versions: 66
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Contents
require 'fs/ext3/group_descriptor_entry'
require 'fs/ext3/alloc_bitmap'
require 'binary_struct'
module Ext3
class GroupDescriptorTable
def initialize(sb)
raise "Ext3::GroupDescriptorTable.initialize: Nil Superblock" if sb.nil?
# Read all the group descriptor entries.
@gdt = []
sb.stream.seek(sb.blockToAddress(sb.blockSize == 1024 ? 2 : 1))
buf = sb.stream.read(SIZEOF_GDE * sb.numGroups)
offset = 0
sb.numGroups.times do
gde = GroupDescriptorEntry.new(buf[offset, SIZEOF_GDE])
# Construct allocation bitmaps for blocks & inodes.
gde.blockAllocBmp = getAllocBitmap(sb, gde.blockBmp, sb.blockSize)
gde.inodeAllocBmp = getAllocBitmap(sb, gde.inodeBmp, sb.inodesPerGroup / 8)
@gdt << gde
offset += SIZEOF_GDE
end
end
def each
@gdt.each { |gde| yield(gde) }
end
def [](group)
@gdt[group]
end
def dump(dump_bitmaps = false)
out = "\#<#{self.class}:0x#{'%08x' % object_id}>\n"
@gdt.each do|gde|
out += gde.dump
if dump_bitmaps
out += "Block allocation\n#{gde.blockAllocBmp.dump}"
out += "Inode allocation\n#{gde.inodeAllocBmp.dump}"
end
end
out
end
private
def getAllocBitmap(sb, block, size)
sb.stream.seek(sb.blockToAddress(block))
AllocBitmap.new(sb.stream.read(size))
end
end # class
end # module
Version data entries
66 entries across 66 versions & 1 rubygems