Class: Zip::Entry

Inherits:
Object
  • Object
show all
Defined in:
lib/zip/entry.rb

Direct Known Subclasses

StreamableDirectory, StreamableStream

Constant Summary collapse

STORED = 
0
DEFLATED = 
8
EFS =

Language encoding flag (EFS) bit

0b100000000000

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Entry

Returns a new instance of Entry.



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# File 'lib/zip/entry.rb', line 52

def initialize(*args)
  name = args[1] || ''
  check_name(name)

  set_default_vars_values
  @fstype = ::Zip::RUNNING_ON_WINDOWS ? ::Zip::FSTYPE_FAT : ::Zip::FSTYPE_UNIX

  @zipfile            = args[0] || ''
  @name               = name
  @comment            = args[2] || ''
  @extra              = args[3] || ''
  @compressed_size    = args[4] || 0
  @crc                = args[5] || 0
  @compression_method = args[6] || ::Zip::Entry::DEFLATED
  @size               = args[7] || 0
  @time               = args[8] || ::Zip::DOSTime.now

  @ftype = name_is_directory? ? :directory : :file
  @extra = ::Zip::ExtraField.new(@extra.to_s) unless @extra.is_a?(::Zip::ExtraField)
end

Instance Attribute Details

#comment ⇒ Object

Returns the value of attribute comment.



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# File 'lib/zip/entry.rb', line 8

def comment
  @comment
end

#compressed_size ⇒ Object

Returns the value of attribute compressed_size.



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# File 'lib/zip/entry.rb', line 8

def compressed_size
  @compressed_size
end

#compression_method ⇒ Object

Returns the value of attribute compression_method.



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# File 'lib/zip/entry.rb', line 8

def compression_method
  @compression_method
end

#crc ⇒ Object

Returns the value of attribute crc.



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# File 'lib/zip/entry.rb', line 8

def crc
  @crc
end

#dirty ⇒ Object

Returns the value of attribute dirty.



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# File 'lib/zip/entry.rb', line 8

def dirty
  @dirty
end

#external_file_attributes ⇒ Object

Returns the value of attribute external_file_attributes.



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# File 'lib/zip/entry.rb', line 8

def external_file_attributes
  @external_file_attributes
end

#extra ⇒ Object

Returns the value of attribute extra.



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# File 'lib/zip/entry.rb', line 8

def extra
  @extra
end

#filepath ⇒ Object (readonly)

:nodoc:



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# File 'lib/zip/entry.rb', line 14

def filepath
  @filepath
end

#follow_symlinks ⇒ Object

Returns the value of attribute follow_symlinks.



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# File 'lib/zip/entry.rb', line 8

def follow_symlinks
  @follow_symlinks
end

#fstype ⇒ Object

Returns the value of attribute fstype.



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# File 'lib/zip/entry.rb', line 8

def fstype
  @fstype
end

#ftype ⇒ Object (readonly)

:nodoc:



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# File 'lib/zip/entry.rb', line 14

def ftype
  @ftype
end

#gp_flags ⇒ Object

Returns the value of attribute gp_flags.



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# File 'lib/zip/entry.rb', line 8

def gp_flags
  @gp_flags
end

#header_signature ⇒ Object

Returns the value of attribute header_signature.



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# File 'lib/zip/entry.rb', line 8

def header_signature
  @header_signature
end

#local_header_offset ⇒ Object

Returns the value of attribute local_header_offset.



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# File 'lib/zip/entry.rb', line 8

def local_header_offset
  @local_header_offset
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/zip/entry.rb', line 8

def name
  @name
end

#restore_ownership ⇒ Object

Returns the value of attribute restore_ownership.



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# File 'lib/zip/entry.rb', line 8

def restore_ownership
  @restore_ownership
end

#restore_permissions ⇒ Object

Returns the value of attribute restore_permissions.



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# File 'lib/zip/entry.rb', line 8

def restore_permissions
  @restore_permissions
end

#restore_times ⇒ Object

Returns the value of attribute restore_times.



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# File 'lib/zip/entry.rb', line 8

def restore_times
  @restore_times
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/zip/entry.rb', line 8

def size
  @size
end

#unix_gid ⇒ Object

Returns the value of attribute unix_gid.



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# File 'lib/zip/entry.rb', line 8

def unix_gid
  @unix_gid
end

#unix_perms ⇒ Object

Returns the value of attribute unix_perms.



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# File 'lib/zip/entry.rb', line 8

def unix_perms
  @unix_perms
end

#unix_uid ⇒ Object

Returns the value of attribute unix_uid.



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# File 'lib/zip/entry.rb', line 8

def unix_uid
  @unix_uid
end

#zipfile ⇒ Object

Returns the value of attribute zipfile.



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# File 'lib/zip/entry.rb', line 8

def zipfile
  @zipfile
end

Class Method Details

.read_c_dir_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 178

def read_c_dir_entry(io) #:nodoc:all
  path = if io.respond_to?(:path)
           io.path
         else
           io
         end
  entry = new(path)
  entry.read_c_dir_entry(io)
  entry
rescue Error
  nil
end

.read_local_entry(io) ⇒ Object 



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# File 'lib/zip/entry.rb', line 191

def read_local_entry(io)
  entry = new(io)
  entry.read_local_entry(io)
  entry
rescue Error
  nil
end

.read_zip_64_long(io) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 174

def read_zip_64_long(io) # :nodoc:
  io.read(8).unpack('Q<')[0]
end

.read_zip_long(io) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 170

def read_zip_long(io) # :nodoc:
  io.read(4).unpack('V')[0]
end

.read_zip_short(io) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 166

def read_zip_short(io) # :nodoc:
  io.read(2).unpack('v')[0]
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/zip/entry.rb', line 467

def <=>(other)
  to_s <=> other.to_s
end

#==(other) ⇒ Object 



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# File 'lib/zip/entry.rb', line 458

def ==(other)
  return false unless other.class == self.class
  # Compares contents of local entry and exposed fields
  keys_equal = %w(compression_method crc compressed_size size name extra filepath).all? do |k|
    other.__send__(k.to_sym) == __send__(k.to_sym)
  end
  keys_equal && time.dos_equals(other.time)
end

#calculate_local_header_size ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 127

def calculate_local_header_size #:nodoc:all
  LOCAL_ENTRY_STATIC_HEADER_LENGTH + name_size + extra_size
end

#cdir_header_size ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 139

def cdir_header_size #:nodoc:all
  CDIR_ENTRY_STATIC_HEADER_LENGTH + name_size +
    (@extra ? @extra.c_dir_size : 0) + comment_size
end

#check_c_dir_entry_comment_size ⇒ Object

Raises:



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# File 'lib/zip/entry.rb', line 341

def check_c_dir_entry_comment_size
  return if @comment && @comment.bytesize == @comment_length
  raise ::Zip::Error, 'Truncated cdir zip entry header'
end

#check_c_dir_entry_signature ⇒ Object

Raises:



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# File 'lib/zip/entry.rb', line 336

def check_c_dir_entry_signature
  return if header_signature == ::Zip::CENTRAL_DIRECTORY_ENTRY_SIGNATURE
  raise Error, "Zip local header magic not found at location '#{local_header_offset}'"
end

#check_c_dir_entry_static_header_length(buf) ⇒ Object

Raises:



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# File 'lib/zip/entry.rb', line 331

def check_c_dir_entry_static_header_length(buf)
  return if buf.bytesize == ::Zip::CDIR_ENTRY_STATIC_HEADER_LENGTH
  raise Error, 'Premature end of file. Not enough data for zip cdir entry header'
end

#check_name(name) ⇒ Object

Raises:



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# File 'lib/zip/entry.rb', line 47

def check_name(name)
  return unless name.start_with?('/')
  raise ::Zip::EntryNameError, "Illegal ZipEntry name '#{name}', name must not start with /"
end

#clean_up ⇒ Object 



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# File 'lib/zip/entry.rb', line 558

def clean_up
  # By default, do nothing
end

#comment_size ⇒ Object 



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# File 'lib/zip/entry.rb', line 123

def comment_size
  @comment ? @comment.bytesize : 0
end

#extra_size ⇒ Object 



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# File 'lib/zip/entry.rb', line 119

def extra_size
  @extra ? @extra.local_size : 0
end

#extract(dest_path = @name, &block) ⇒ Object

Extracts entry to file dest_path (defaults to @name).



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# File 'lib/zip/entry.rb', line 149

def extract(dest_path = @name, &block)
  block ||= proc { ::Zip.on_exists_proc }

  if directory? || file? || symlink?
    __send__("create_#{@ftype}", dest_path, &block)
  else
    raise "unknown file type #{inspect}"
  end

  self
end

#file_stat(path) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 368

def file_stat(path) # :nodoc:
  if @follow_symlinks
    ::File.stat(path)
  else
    ::File.lstat(path)
  end
end

#file_type_is?(type) ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/zip/entry.rb', line 95

def file_type_is?(type)
  raise InternalError, "current filetype is unknown: #{inspect}" unless @ftype
  @ftype == type
end

#gather_fileinfo_from_srcpath(src_path) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 505

def gather_fileinfo_from_srcpath(src_path) # :nodoc:
  stat   = file_stat(src_path)
  @ftype = case stat.ftype
           when 'file'
             if name_is_directory?
               raise ArgumentError,
                     "entry name '#{newEntry}' indicates directory entry, but " \
                         "'#{src_path}' is not a directory"
             end
             :file
           when 'directory'
             @name += '/' unless name_is_directory?
             :directory
           when 'link'
             if name_is_directory?
               raise ArgumentError,
                     "entry name '#{newEntry}' indicates directory entry, but " \
                         "'#{src_path}' is not a directory"
             end
             :symlink
           else
             raise "unknown file type: #{src_path.inspect} #{stat.inspect}"
           end

  @filepath = src_path
  get_extra_attributes_from_path(@filepath)
end

#get_extra_attributes_from_path(path) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 376

def get_extra_attributes_from_path(path) # :nodoc:
  return if Zip::RUNNING_ON_WINDOWS
  stat        = file_stat(path)
  @unix_uid   = stat.uid
  @unix_gid   = stat.gid
  @unix_perms = stat.mode & 07777
end

#get_input_stream(&block) ⇒ Object

Returns an IO like object for the given ZipEntry. Warning: may behave weird with symlinks.



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# File 'lib/zip/entry.rb', line 473

def get_input_stream(&block)
  if @ftype == :directory
    yield ::Zip::NullInputStream if block_given?
    ::Zip::NullInputStream
  elsif @filepath
    case @ftype
    when :file
      ::File.open(@filepath, 'rb', &block)
    when :symlink
      linkpath = ::File.readlink(@filepath)
      stringio = ::StringIO.new(linkpath)
      yield(stringio) if block_given?
      stringio
    else
      raise "unknown @file_type #{@ftype}"
    end
  else
    zis = ::Zip::InputStream.new(@zipfile, local_header_offset)
    zis.instance_variable_set(:@internal, true)
    zis.get_next_entry
    if block_given?
      begin
        yield(zis)
      ensure
        zis.close
      end
    else
      zis
    end
  end
end

#get_raw_input_stream(&block) ⇒ Object 



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# File 'lib/zip/entry.rb', line 550

def get_raw_input_stream(&block)
  if @zipfile.respond_to?(:seek) && @zipfile.respond_to?(:read)
    yield @zipfile
  else
    ::File.open(@zipfile, 'rb', &block)
  end
end

#local_entry_offset ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 111

def local_entry_offset #:nodoc:all
  local_header_offset + @local_header_size
end

#name_is_directory? ⇒ Boolean

:nodoc:all

Returns:

  • (Boolean) 


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# File 'lib/zip/entry.rb', line 107

def name_is_directory? #:nodoc:all
  @name.end_with?('/')
end

#name_size ⇒ Object 



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# File 'lib/zip/entry.rb', line 115

def name_size
  @name ? @name.bytesize : 0
end

#next_header_offset ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 144

def next_header_offset #:nodoc:all
  local_entry_offset + compressed_size + data_descriptor_size
end

#pack_c_dir_entry ⇒ Object 



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# File 'lib/zip/entry.rb', line 403

def pack_c_dir_entry
  zip64 = @extra['Zip64']
  [
    @header_signature,
    @version, # version of encoding software
    @fstype, # filesystem type
    @version_needed_to_extract, # @versionNeededToExtract           ,
    @gp_flags, # @gp_flags                          ,
    @compression_method,
    @time.to_binary_dos_time, # @last_mod_time                      ,
    @time.to_binary_dos_date, # @last_mod_date                      ,
    @crc,
    (zip64 && zip64.compressed_size) ? 0xFFFFFFFF : @compressed_size,
    (zip64 && zip64.original_size) ? 0xFFFFFFFF : @size,
    name_size,
    @extra ? @extra.c_dir_size : 0,
    comment_size,
    (zip64 && zip64.disk_start_number) ? 0xFFFF : 0, # disk number start
    @internal_file_attributes, # file type (binary=0, text=1)
    @external_file_attributes, # native filesystem attributes
    (zip64 && zip64.relative_header_offset) ? 0xFFFFFFFF : @local_header_offset,
    @name,
    @extra,
    @comment
  ].pack('VCCvvvvvVVVvvvvvVV')
end

#pack_local_entry ⇒ Object 



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# File 'lib/zip/entry.rb', line 251

def pack_local_entry
  zip64 = @extra['Zip64']
  [::Zip::LOCAL_ENTRY_SIGNATURE,
   @version_needed_to_extract, # version needed to extract
   @gp_flags, # @gp_flags                  ,
   @compression_method,
   @time.to_binary_dos_time, # @last_mod_time              ,
   @time.to_binary_dos_date, # @last_mod_date              ,
   @crc,
   (zip64 && zip64.compressed_size) ? 0xFFFFFFFF : @compressed_size,
   (zip64 && zip64.original_size) ? 0xFFFFFFFF : @size,
   name_size,
   @extra ? @extra.local_size : 0].pack('VvvvvvVVVvv')
end

#parent_as_string ⇒ Object 



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# File 'lib/zip/entry.rb', line 544

def parent_as_string
  entry_name  = name.chomp('/')
  slash_index = entry_name.rindex('/')
  slash_index ? entry_name.slice(0, slash_index + 1) : nil
end

#read_c_dir_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 354

def read_c_dir_entry(io) #:nodoc:all
  static_sized_fields_buf = io.read(::Zip::CDIR_ENTRY_STATIC_HEADER_LENGTH)
  check_c_dir_entry_static_header_length(static_sized_fields_buf)
  unpack_c_dir_entry(static_sized_fields_buf)
  check_c_dir_entry_signature
  set_time(@last_mod_date, @last_mod_time)
  @name = io.read(@name_length).tr('\\', '/')
  read_c_dir_extra_field(io)
  @comment = io.read(@comment_length)
  check_c_dir_entry_comment_size
  set_ftype_from_c_dir_entry
  parse_zip64_extra(false)
end

#read_c_dir_extra_field(io) ⇒ Object 



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# File 'lib/zip/entry.rb', line 346

def read_c_dir_extra_field(io)
  if @extra.is_a?(::Zip::ExtraField)
    @extra.merge(io.read(@extra_length))
  else
    @extra = ::Zip::ExtraField.new(io.read(@extra_length))
  end
end

#read_local_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 217

def read_local_entry(io) #:nodoc:all
  @local_header_offset = io.tell

  static_sized_fields_buf = io.read(::Zip::LOCAL_ENTRY_STATIC_HEADER_LENGTH) || ''

  unless static_sized_fields_buf.bytesize == ::Zip::LOCAL_ENTRY_STATIC_HEADER_LENGTH
    raise Error, 'Premature end of file. Not enough data for zip entry local header'
  end

  unpack_local_entry(static_sized_fields_buf)

  unless @header_signature == ::Zip::LOCAL_ENTRY_SIGNATURE
    raise ::Zip::Error, "Zip local header magic not found at location '#{local_header_offset}'"
  end
  set_time(@last_mod_date, @last_mod_time)

  @name = io.read(@name_length)
  extra = io.read(@extra_length)

  @name.gsub!('\\', '/')

  if extra && extra.bytesize != @extra_length
    raise ::Zip::Error, 'Truncated local zip entry header'
  else
    if @extra.is_a?(::Zip::ExtraField)
      @extra.merge(extra) if extra
    else
      @extra = ::Zip::ExtraField.new(extra)
    end
  end
  parse_zip64_extra(true)
  @local_header_size = calculate_local_header_size
end

#set_default_vars_values ⇒ Object 



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

def set_default_vars_values
  @local_header_offset      = 0
  @local_header_size        = nil # not known until local entry is created or read
  @internal_file_attributes = 1
  @external_file_attributes = 0
  @header_signature         = ::Zip::CENTRAL_DIRECTORY_ENTRY_SIGNATURE

  @version_needed_to_extract = VERSION_NEEDED_TO_EXTRACT
  @version                   = VERSION_MADE_BY

  @ftype           = nil          # unspecified or unknown
  @filepath        = nil
  @gp_flags        = 0
  if ::Zip.unicode_names
    @gp_flags |= EFS
    @version = 63
  end
  @follow_symlinks = false

  @restore_times       = true
  @restore_permissions = false
  @restore_ownership   = false
  # BUG: need an extra field to support uid/gid's
  @unix_uid            = nil
  @unix_gid            = nil
  @unix_perms          = nil
  # @posix_acl = nil
  # @ntfs_acl = nil
  @dirty               = false
end

#set_extra_attributes_on_path(dest_path) ⇒ Object

:nodoc:



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# File 'lib/zip/entry.rb', line 394

def set_extra_attributes_on_path(dest_path) # :nodoc:
  return unless file? || directory?

  case @fstype
  when ::Zip::FSTYPE_UNIX
    set_unix_permissions_on_path(dest_path)
  end
end

#set_ftype_from_c_dir_entry ⇒ Object 



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# File 'lib/zip/entry.rb', line 302

def set_ftype_from_c_dir_entry
  @ftype = case @fstype
           when ::Zip::FSTYPE_UNIX
             @unix_perms = (@external_file_attributes >> 16) & 07777
             case (@external_file_attributes >> 28)
             when ::Zip::FILE_TYPE_DIR
               :directory
             when ::Zip::FILE_TYPE_FILE
               :file
             when ::Zip::FILE_TYPE_SYMLINK
               :symlink
             else
               # best case guess for whether it is a file or not
               # Otherwise this would be set to unknown and that entry would never be able to extracted
               if name_is_directory?
                 :directory
               else
                 :file
               end
             end
           else
             if name_is_directory?
               :directory
             else
               :file
             end
           end
end

#set_unix_permissions_on_path(dest_path) ⇒ Object 



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# File 'lib/zip/entry.rb', line 384

def set_unix_permissions_on_path(dest_path)
  # BUG: does not update timestamps into account
  # ignore setuid/setgid bits by default.  honor if @restore_ownership
  unix_perms_mask = 01777
  unix_perms_mask = 07777 if @restore_ownership
  ::FileUtils.chmod(@unix_perms & unix_perms_mask, dest_path) if @restore_permissions && @unix_perms
  ::FileUtils.chown(@unix_uid, @unix_gid, dest_path) if @restore_ownership && @unix_uid && @unix_gid && ::Process.egid == 0
  # File::utimes()
end

#time ⇒ Object Also known as: mtime 



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# File 'lib/zip/entry.rb', line 73

def time
  if @extra['UniversalTime']
    @extra['UniversalTime'].mtime
  elsif @extra['NTFS']
    @extra['NTFS'].mtime
  else
    # Standard time field in central directory has local time
    # under archive creator. Then, we can't get timezone.
    @time
  end
end

#time=(value) ⇒ Object 



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# File 'lib/zip/entry.rb', line 87

def time=(value)
  unless @extra.member?('UniversalTime') || @extra.member?('NTFS')
    @extra.create('UniversalTime')
  end
  (@extra['UniversalTime'] || @extra['NTFS']).mtime = value
  @time                         = value
end

#to_s ⇒ Object 



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# File 'lib/zip/entry.rb', line 161

def to_s
  @name
end

#unpack_c_dir_entry(buf) ⇒ Object 



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# File 'lib/zip/entry.rb', line 278

def unpack_c_dir_entry(buf)
  @header_signature,
    @version, # version of encoding software
    @fstype, # filesystem type
    @version_needed_to_extract,
    @gp_flags,
    @compression_method,
    @last_mod_time,
    @last_mod_date,
    @crc,
    @compressed_size,
    @size,
    @name_length,
    @extra_length,
    @comment_length,
    _, # diskNumberStart
    @internal_file_attributes,
    @external_file_attributes,
    @local_header_offset,
    @name,
    @extra,
    @comment = buf.unpack('VCCvvvvvVVVvvvvvVV')
end

#unpack_local_entry(buf) ⇒ Object 



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# File 'lib/zip/entry.rb', line 202

def unpack_local_entry(buf)
  @header_signature,
    @version,
    @fstype,
    @gp_flags,
    @compression_method,
    @last_mod_time,
    @last_mod_date,
    @crc,
    @compressed_size,
    @size,
    @name_length,
    @extra_length = buf.unpack('VCCvvvvVVVvv')
end

#verify_local_header_size! ⇒ Object

check before rewriting an entry (after file sizes are known) that we didn’t change the header size (and thus clobber file data or something)

Raises:



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# File 'lib/zip/entry.rb', line 133

def verify_local_header_size!
  return if @local_header_size.nil?
  new_size = calculate_local_header_size
  raise Error, "local header size changed (#{@local_header_size} -> #{new_size})" if @local_header_size != new_size
end

#write_c_dir_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 430

def write_c_dir_entry(io) #:nodoc:all
  prep_zip64_extra(false)
  case @fstype
  when ::Zip::FSTYPE_UNIX
    ft = case @ftype
         when :file
           @unix_perms ||= 0644
           ::Zip::FILE_TYPE_FILE
         when :directory
           @unix_perms ||= 0755
           ::Zip::FILE_TYPE_DIR
         when :symlink
           @unix_perms ||= 0755
           ::Zip::FILE_TYPE_SYMLINK
         end

    unless ft.nil?
      @external_file_attributes = (ft << 12 | (@unix_perms & 07777)) << 16
    end
  end

  io << pack_c_dir_entry

  io << @name
  io << (@extra ? @extra.to_c_dir_bin : '')
  io << @comment
end

#write_local_entry(io, rewrite = false) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 266

def write_local_entry(io, rewrite = false) #:nodoc:all
  prep_zip64_extra(true)
  verify_local_header_size! if rewrite
  @local_header_offset = io.tell

  io << pack_local_entry

  io << @name
  io << @extra.to_local_bin if @extra
  @local_header_size = io.tell - @local_header_offset
end

#write_to_zip_output_stream(zip_output_stream) ⇒ Object

:nodoc:all



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# File 'lib/zip/entry.rb', line 533

def write_to_zip_output_stream(zip_output_stream) #:nodoc:all
  if @ftype == :directory
    zip_output_stream.put_next_entry(self, nil, nil, ::Zip::Entry::STORED)
  elsif @filepath
    zip_output_stream.put_next_entry(self, nil, nil, compression_method || ::Zip::Entry::DEFLATED)
    get_input_stream { |is| ::Zip::IOExtras.copy_stream(zip_output_stream, is) }
  else
    zip_output_stream.copy_raw_entry(self)
  end
end