Class: Iso9660::Directory

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

Constant Summary collapse

FE_DIR =

Find entry flags.

0
FE_FILE = 
1
FE_EITHER = 
2
SUSP =

System Use Sharing Protocol header (for Rock Ridge in this implementation).

BinaryStruct.new([
  'a2', 'signature',
  'C',  'len',
  'C',  'version',
  'n',  'check',
  'C',  'skip_bytes'
])
SUSP_SIGNATURE = 
"SP"
SUSP_SIZE = 
7
SUSP_VERSION = 
1
SUSP_CHECK_WORD = 
0xbeef

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bs, thisEntry) ⇒ Directory

Returns a new instance of Directory.



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# File 'lib/fs/iso9660/directory.rb', line 26

def initialize(bs, thisEntry)
  raise "Boot sector is nil." if bs.nil?
  raise "No directory entry specified." if thisEntry.nil?
  raise "Given entry is not a DirectoryEntry" if thisEntry.class.to_s != "Iso9660::DirectoryEntry"

  @bs = bs
  @myEnt = thisEntry
  @data = getDirData

  # Check for RockRidge extensions.
  @susp = checkRockRidge(DirectoryEntry.new(@data, @bs.suff))
end

Instance Attribute Details

#myEnt ⇒ Object (readonly)

Returns the value of attribute myEnt.



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# File 'lib/fs/iso9660/directory.rb', line 24

def myEnt
  @myEnt
end

#susp ⇒ Object (readonly)

Returns the value of attribute susp.



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# File 'lib/fs/iso9660/directory.rb', line 24

def susp
  @susp
end

Instance Method Details

#checkRockRidge(de) ⇒ Object 



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# File 'lib/fs/iso9660/directory.rb', line 78

def checkRockRidge(de)
  if de.sua
    susp = SUSP.decode(de.sua)
    return nil if susp['signature'] != SUSP_SIGNATURE
    return nil if susp['len'] != SUSP_SIZE
    return nil if susp['check'] != SUSP_CHECK_WORD
    raise "System Use Sharing Protocol version mismatch" if susp['version'] != SUSP_VERSION
    return susp
  end
  nil
end

#findEntry(name, _flags = FE_EITHER) ⇒ Object 



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# File 'lib/fs/iso9660/directory.rb', line 49

def findEntry(name, _flags = FE_EITHER)
  # TODO: enable flags
  globEntries.each do |de|
    return de if de.name == name        # Joliet & RR are case sensitive.
    return de if de.name == name.upcase # ISO 9660 is ucase only.
  end
  nil
end

#getDirData ⇒ Object 



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# File 'lib/fs/iso9660/directory.rb', line 39

def getDirData
  @bs.getSectors(@myEnt.fileStart, @myEnt.fileSize / @bs.sectorSize)
end

#globEntries ⇒ Object 



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# File 'lib/fs/iso9660/directory.rb', line 58

def globEntries
  # Prep flag bits.
  flags = EXT_NONE
  flags |= EXT_JOLIET if @bs.isJoliet?
  flags |= EXT_ROCKRIDGE if @susp

  # Glob entries.
  entries = []
  offset = 0
  loop do
    de = DirectoryEntry.new(@data[offset..-1], @bs.suff, flags)
    break if de.length == 0
    entries << de
    # Debugging only.
    # puts "#{de.dump}\n"
    offset += de.length
  end
  entries
end

#globNames ⇒ Object 



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# File 'lib/fs/iso9660/directory.rb', line 43

def globNames
  names = []
  globEntries.each { |de| names << de.name }
  names
end