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Contents
module XFS
#
# Directory Entry when stored internal to an inode.
# Small directories are packed as tightly as possible so as to fit into the
# literal area of the inode. These "shortform" directories consist of a
# single header followed by zero or more dir entries. Due to the different
# inode number storage size and the variable length name field in the dir
# entry all these structures are variable length, and the accessors in
# this file should be used to iterate over them.
#
DIRECTORY_SHORTERFORM_HEADER = BinaryStruct.new([
'C', 'entry_count', # count of entries
'C', 'i8byte_count', # count of 8-byte inode #s
'I>', 'parent_ino_4byte', # parent dir inode # stored as 4 8-bit values
])
SIZEOF_DIRECTORY_SHORTERFORM_HEADER = DIRECTORY_SHORTERFORM_HEADER.size
DIRECTORY_SHORTFORM_HEADER = BinaryStruct.new([
'C', 'entry_count', # count of entries
'C', 'i8byte_count', # count of 8-byte inode #s
'Q>', 'parent_ino_8byte', # parent dir inode # stored as 8 8-bit values
])
SIZEOF_DIRECTORY_SHORTFORM_HEADER = DIRECTORY_SHORTFORM_HEADER.size
class ShortFormHeader
attr_reader :short_form_header, :entry_count, :parent_inode, :size, :small_inode
def initialize(data)
@short_form_header = DIRECTORY_SHORTERFORM_HEADER.decode(data)
@entry_count = @short_form_header['entry_count']
i8byte_count = @short_form_header['i8byte_count']
@parent_inode = @short_form_header['parent_ino_4byte']
@size = SIZEOF_DIRECTORY_SHORTERFORM_HEADER
@small_inode = true
if @entry_count == 0
@entry_count = i8byte_count
@short_form_header = DIRECTORY_SHORTFORM_HEADER.decode(data)
@parent_inode = @short_form_header['parent_ino_8byte']
@size = SIZEOF_DIRECTORY_SHORTFORM_HEADER
@small_inode = nil
end
end
end # class ShortFormHeader
end # module XFS
Version data entries
66 entries across 66 versions & 1 rubygems