Class: Iso9660::RockRidge

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

Overview

class Extension

Constant Summary collapse

SUSP_SIZE = 
7
CONTINUE = 
1

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(de, suff) ⇒ RockRidge

Returns a new instance of RockRidge.



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# File 'lib/fs/iso9660/rock_ridge.rb', line 285

def initialize(de, suff)
  raise "No DirectoryEntry specified." if de.nil?
  raise "The specified DirectoryEntry has no System Use Area." if de.sua.nil?

  # Root directories need to skip SUSP header.
  offset = de.name == "." ? SUSP_SIZE : 0

  # Get the RR header from the DirectoryEntry & verify.
  @header = RR_HEADER.decode(de.sua[offset..-1])
  raise "This is not a Rock Ridge extension record" if @header['signature'] != RR_SIGNATURE

  # Loop through extensions.
  offset += RR_HEADER_SIZE
  @extensions = []
  loop do
    # puts "Extension data:
    # de.sua[offset..-1].hex_dump(:obj => STDOUT, :meth => :puts, :newline => false)
    # puts "\n\n"
    ext = Extension.new(de.sua[offset..-1], suff)
    @extensions << ext
    offset += ext.length
    break if offset >= de.sua.length
  end

  # Handle continuations.
  0.upto(@extensions.size - 1) do |idx|
    obj = @extensions[idx]
    next if obj.nil?

    # TODO: Simplify this - the meat of all extensions is .data
    if obj.flags & CONTINUE
      if obj.kind_of?(AlternateName)
        obj.name += @extensions[idx + 1].name
        @extensions[idx + 1] = nil
      end
      if obj.kind_of?(SymbolicLink)
        obj.linkData += @extensions[idx + 1].linkData
        @extensions[idx + 1] = nil
      end
    end
  end
  @extensions.delete(nil)
end

Instance Attribute Details

#extensions ⇒ Object (readonly)

Returns the value of attribute extensions.



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# File 'lib/fs/iso9660/rock_ridge.rb', line 283

def extensions
  @extensions
end