Class: Omnizip::Formats::Iso::DirectoryRecord

Inherits:
Object
  • Object
show all
Defined in:
lib/omnizip/formats/iso/directory_record.rb

Overview

ISO 9660 Directory Record Represents a file or directory entry

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#data_length ⇒ Object (readonly)

Returns the value of attribute data_length.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def data_length
  @data_length
end

#extended_attr_length ⇒ Object (readonly)

Returns the value of attribute extended_attr_length.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def extended_attr_length
  @extended_attr_length
end

#file_unit_size ⇒ Object (readonly)

Returns the value of attribute file_unit_size.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def file_unit_size
  @file_unit_size
end

#flags ⇒ Object (readonly)

Returns the value of attribute flags.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def flags
  @flags
end

#full_path ⇒ Object

Returns the value of attribute full_path.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 9

def full_path
  @full_path
end

#interleave_gap_size ⇒ Object (readonly)

Returns the value of attribute interleave_gap_size.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def interleave_gap_size
  @interleave_gap_size
end

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def length
  @length
end

#location ⇒ Object (readonly)

Returns the value of attribute location.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def location
  @location
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def name
  @name
end

#recording_date ⇒ Object (readonly)

Returns the value of attribute recording_date.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def recording_date
  @recording_date
end

#system_use ⇒ Object (readonly)

Returns the value of attribute system_use.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def system_use
  @system_use
end

#volume_sequence_number ⇒ Object (readonly)

Returns the value of attribute volume_sequence_number.



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 10

def volume_sequence_number
  @volume_sequence_number
end

Class Method Details

.parse(data, offset = 0) ⇒ DirectoryRecord

Parse directory record from binary data

Parameters:

  • data (String) —

    Binary record data

  • offset (Integer) (defaults to: 0) —

    Offset in data to start parsing

Returns:



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 21

def self.parse(data, offset = 0)
  new.tap { |record| record.parse(data, offset) }
end

Instance Method Details

#current_directory? ⇒ Boolean

Check if this is the current directory entry

Returns:

  • (Boolean) —

    true if current directory



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 94

def current_directory?
  @name == "\x00"
end

#directory? ⇒ Boolean

Check if entry is a directory

Returns:

  • (Boolean) —

    true if directory



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 80

def directory?
  @flags.anybits?(Iso::FLAG_DIRECTORY)
end

#hidden? ⇒ Boolean

Check if entry is hidden

Returns:

  • (Boolean) —

    true if hidden



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 87

def hidden?
  @flags.anybits?(Iso::FLAG_HIDDEN)
end

#mtime ⇒ Time?

Get modification time

Returns:

  • (Time, nil) —

    Modification time



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 115

def mtime
  @recording_date
end

#parent_directory? ⇒ Boolean

Check if this is the parent directory entry

Returns:

  • (Boolean) —

    true if parent directory



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 101

def parent_directory?
  @name == "\x01"
end

#parse(data, offset = 0) ⇒ Object

Parse record data

Parameters:

  • data (String) —

    Binary data

  • offset (Integer) (defaults to: 0) —

    Starting offset



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 29

def parse(data, offset = 0)
  # Byte 0: Length of directory record
  @length = data.getbyte(offset)
  return if @length.zero? # Padding

  # Byte 1: Extended attribute record length
  @extended_attr_length = data.getbyte(offset + 1)

  # Bytes 2-9: Location of extent (both-endian)
  @location = data[offset + 2, 4].unpack1("V")

  # Bytes 10-17: Data length (both-endian)
  @data_length = data[offset + 10, 4].unpack1("V")

  # Bytes 18-24: Recording date and time
  @recording_date = parse_record_datetime(data[offset + 18, 7])

  # Byte 25: File flags
  @flags = data.getbyte(offset + 25)

  # Byte 26: File unit size (for interleaved files)
  @file_unit_size = data.getbyte(offset + 26)

  # Byte 27: Interleave gap size
  @interleave_gap_size = data.getbyte(offset + 27)

  # Bytes 28-31: Volume sequence number (both-endian)
  @volume_sequence_number = data[offset + 28, 2].unpack1("v")

  # Byte 32: Length of file identifier
  name_length = data.getbyte(offset + 32)

  # Bytes 33+: File identifier
  @name = data[offset + 33, name_length]

  # Parse file identifier
  parse_name

  # System Use field (Rock Ridge extensions, etc.)
  # Located after name and padding
  su_offset = offset + 33 + name_length
  su_offset += 1 if name_length.even? # Padding byte

  return unless su_offset < offset + @length

  @system_use = data[su_offset, offset + @length - su_offset]
end

#size ⇒ Integer

Get file size

Returns:

  • (Integer) —

    Size in bytes



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# File 'lib/omnizip/formats/iso/directory_record.rb', line 108

def size
  @data_length
end