Class: Iso9660::DirectoryEntry

Inherits:
Object
  • Object
show all
Defined in:
lib/fs/iso9660/directory_entry.rb

Constant Summary collapse

DIR_ENT = 
BinaryStruct.new([
  'C',  'length',           # Bytes, must be even.
  'C',  'ext_attr_length',  # Sectors.
  'L',  'extentLE',         # First sector of data.
  'L',  'extentBE',
  'L',  'sizeLE',           # Size of data in bytes.
  'L',  'sizeBE',
  'a7', 'date',             # ISODATE
  'C',  'flags',            # Flags, see FB_ above.
  'C',  'file_unit_size',   # For interleaved files: not supported.
  'C',  'interleave',       # Not supported.
  'S',  'vol_seq_numLE',    # Not used.
  'S',  'vol_seq_numBE',
  'C',  'name_len',         # Bytes.
])
SIZEOF_DIR_ENT =

Here follows a name. Character set is limited ASCII. Here follows an optional padding byte (if name_len is even). Here follows unspecified extra data, size is included in member length.

DIR_ENT.size

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, suff, flags = EXT_NONE) ⇒ DirectoryEntry

Returns a new instance of DirectoryEntry.



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# File 'lib/fs/iso9660/directory_entry.rb', line 47

def initialize(data, suff, flags = EXT_NONE)
  raise "Data is nil." if data.nil?

  @suff = suff
  # Get data.
  @de = DIR_ENT.decode(data)
  @length = @de['length']
  @myEnt = data[0...@length]
  @date = Util.IsoShortToRubyDate(@de['date'])
  offset = SIZEOF_DIR_ENT
  len = @de['name_len']
  if len > 0
    name = data[offset...(offset + len)]
    # Convert 00 to dot and 01 to dotdot.
    if len == 1 && (name[0] == 0 || name[0] == 1)
      name = "." if name[0] == 0
      name = ".." if name[0] == 1
    else
      name.Ucs2ToAscii! if flags & EXT_JOLIET == EXT_JOLIET
    end
    offset += len
    offset += 1 if len & 1 == 0 && (flags & EXT_JOLIET == 0) # Cheap test for even/odd.
  end
  @de['name'] = name
  @de['sua'] = data[offset...@de['length'] - 1] if offset < @de['length']
  processRockRidge if flags & EXT_ROCKRIDGE == EXT_ROCKRIDGE
end

Instance Attribute Details

#date ⇒ Object (readonly)

Returns the value of attribute date.



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# File 'lib/fs/iso9660/directory_entry.rb', line 45

def date
  @date
end

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/fs/iso9660/directory_entry.rb', line 45

def length
  @length
end

#myEnt ⇒ Object (readonly)

Returns the value of attribute myEnt.



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# File 'lib/fs/iso9660/directory_entry.rb', line 45

def myEnt
  @myEnt
end

Instance Method Details

#checkExt(sym) ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 109

def checkExt(sym)
  return nil if @rr.nil?
  res = nil
  @rr.extensions.each do |extension|
    ext = extension.ext
    begin
      res = ext.send(sym)
    rescue
      break unless res.nil?
    end
  end
  res
end

#dump ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 131

def dump
  out = ""
  out << "Length  : #{@de['length']}\n"
  out << "Attr len: #{@de['ext_attr_length']} (sectors)\n"
  out << "Data sec: #{@de["extent#{@suff}"]}\n"
  out << "Size    : #{@de["size#{@suff}"]}\n"
  out << "Date    : #{@date}\n"
  out << "Flags   : 0x#{'%02x' % @de['flags']}\n"
  out << "Name len: #{@de['name_len']}\n"
  out << "Name    : #{@de['name']}\n"
  if @de['sua']
    out << "System U:\n"
    out << @de['sua'].hex_dump
  end
  out
end

#fileSize ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 87

def fileSize
  return @de["size#{@suff}"] if @rr.nil?
  size = checkExt("linkData")
  return size.size unless size.nil?
  @de["size#{@suff}"]
end

#fileStart ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 83

def fileStart
  @de["extent#{@suff}"]
end

#isDir? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/iso9660/directory_entry.rb', line 98

def isDir?
  @de['flags'] & FB_DIRECTORY == FB_DIRECTORY
end

#isFile? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/iso9660/directory_entry.rb', line 94

def isFile?
  @de['flags'] & FB_DIRECTORY == 0
end

#isSymLink? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/iso9660/directory_entry.rb', line 102

def isSymLink?
  return false if @rr.nil?
  isLink = checkExt("linkData")
  return true unless isLink.nil?
  false
end

#name ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 75

def name
  @de['name']
end

#processRockRidge ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 123

def processRockRidge
  return if length == 0
  @rr = RockRidge.new(self)
  # Check for alternate name.
  new_name = checkExt("name")
  @de['name'] = new_name unless new_name.nil?
end

#sua ⇒ Object 



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# File 'lib/fs/iso9660/directory_entry.rb', line 79

def sua
  @de['sua']
end