Class: Zip::ZipCentralDirectory

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/zip/zip_central_directory.rb

Direct Known Subclasses

ZipFile

Constant Summary collapse

END_OF_CENTRAL_DIRECTORY_SIGNATURE = 
0x06054b50
MAX_END_OF_CENTRAL_DIRECTORY_STRUCTURE_SIZE = 
65536 + 18
STATIC_EOCD_SIZE = 
22

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(entries = ZipEntrySet.new, comment = "") ⇒ ZipCentralDirectory

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 16

def initialize(entries = ZipEntrySet.new, comment = "")  #:nodoc:
  super()
  @entrySet = entries.kind_of?(ZipEntrySet) ? entries : ZipEntrySet.new(entries)
  @comment = comment
end

Instance Attribute Details

#comment ⇒ Object (readonly)

Returns the value of attribute comment.



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# File 'lib/zip/zip_central_directory.rb', line 9

def comment
  @comment
end

Class Method Details

.read_from_stream(io) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 118

def ZipCentralDirectory.read_from_stream(io)  #:nodoc:
  cdir  = new
  cdir.read_from_stream(io)
  return cdir
rescue ZipError
  return nil
end

Instance Method Details

#==(other) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 126

def ==(other) #:nodoc:
  return false unless other.kind_of?(ZipCentralDirectory)
  @entrySet.entries.sort == other.entries.sort && comment == other.comment
end

#each(&proc) ⇒ Object

For iterating over the entries.



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# File 'lib/zip/zip_central_directory.rb', line 108

def each(&proc)
  @entrySet.each(&proc)
end

#entries ⇒ Object

Returns an Enumerable containing the entries.



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# File 'lib/zip/zip_central_directory.rb', line 12

def entries
  @entrySet.entries
end

#get_e_o_c_d(io) ⇒ Object

:nodoc:

Raises:



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# File 'lib/zip/zip_central_directory.rb', line 89

def get_e_o_c_d(io)  #:nodoc:
  begin
    io.seek(-MAX_END_OF_CENTRAL_DIRECTORY_STRUCTURE_SIZE, IO::SEEK_END)
  rescue Errno::EINVAL
    io.seek(0, IO::SEEK_SET)
  end
  buf = io.read
  sigIndex = buf.rindex([END_OF_CENTRAL_DIRECTORY_SIGNATURE].pack('V'))
  raise ZipError, "Zip end of central directory signature not found" unless sigIndex
  buf = buf.slice!((sigIndex + 4)..(buf.bytesize))

  def buf.read(count)
    slice!(0, count)
  end

  buf
end

#read_central_directory_entries(io) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 71

def read_central_directory_entries(io)  #:nodoc:
  begin
    io.seek(@cdirOffset, IO::SEEK_SET)
  rescue Errno::EINVAL
    raise ZipError, "Zip consistency problem while reading central directory entry"
  end
  @entrySet = ZipEntrySet.new
  @size.times do
    tmp = ZipEntry.read_c_dir_entry(io)
    @entrySet << tmp
  end
end

#read_e_o_c_d(io) ⇒ Object

:nodoc:

Raises:



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# File 'lib/zip/zip_central_directory.rb', line 54

def read_e_o_c_d(io) #:nodoc:
  buf = get_e_o_c_d(io)
  @numberOfThisDisk                     = ZipEntry.read_zip_short(buf)
  @numberOfDiskWithStartOfCDir          = ZipEntry.read_zip_short(buf)
  @totalNumberOfEntriesInCDirOnThisDisk = ZipEntry.read_zip_short(buf)
  @size                                 = ZipEntry.read_zip_short(buf)
  @sizeInBytes                          = ZipEntry.read_zip_long(buf)
  @cdirOffset                           = ZipEntry.read_zip_long(buf)
  commentLength                         = ZipEntry.read_zip_short(buf)
  if commentLength <= 0
    @comment                            = buf.slice!(0, buf.size)
  else
    @comment                            = buf.read(commentLength)
  end
  raise ZipError, "Zip consistency problem while reading eocd structure" unless buf.size == 0
end

#read_from_stream(io) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 84

def read_from_stream(io)  #:nodoc:
  read_e_o_c_d(io)
  read_central_directory_entries(io)
end

#size ⇒ Object

Returns the number of entries in the central directory (and consequently in the zip archive).



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# File 'lib/zip/zip_central_directory.rb', line 114

def size
  @entrySet.size
end

#write_to_stream(io) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_central_directory.rb', line 22

def write_to_stream(io)  #:nodoc:
  offset = io.tell
  @entrySet.each { |entry| entry.write_c_dir_entry(io) }
  write_e_o_c_d(io, offset)
end