Class: Zip::ZipEntry

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

Direct Known Subclasses

ZipStreamableDirectory, ZipStreamableStream

Constant Summary collapse

STORED = 
0
DEFLATED = 
8
FSTYPE_FAT = 
0
FSTYPE_AMIGA = 
1
FSTYPE_VMS = 
2
FSTYPE_UNIX = 
3
FSTYPE_VM_CMS = 
4
FSTYPE_ATARI = 
5
FSTYPE_HPFS = 
6
FSTYPE_MAC = 
7
FSTYPE_Z_SYSTEM = 
8
FSTYPE_CPM = 
9
FSTYPE_TOPS20 = 
10
FSTYPE_NTFS = 
11
FSTYPE_QDOS = 
12
FSTYPE_ACORN = 
13
FSTYPE_VFAT = 
14
FSTYPE_MVS = 
15
FSTYPE_BEOS = 
16
FSTYPE_TANDEM = 
17
FSTYPE_THEOS = 
18
FSTYPE_MAC_OSX = 
19
FSTYPE_ATHEOS = 
30
FSTYPES = 
{
  FSTYPE_FAT => 'FAT'.freeze,
  FSTYPE_AMIGA => 'Amiga'.freeze,
  FSTYPE_VMS => 'VMS (Vax or Alpha AXP)'.freeze,
  FSTYPE_UNIX => 'Unix'.freeze,
  FSTYPE_VM_CMS => 'VM/CMS'.freeze,
  FSTYPE_ATARI => 'Atari ST'.freeze,
  FSTYPE_HPFS => 'OS/2 or NT HPFS'.freeze,
  FSTYPE_MAC => 'Macintosh'.freeze,
  FSTYPE_Z_SYSTEM => 'Z-System'.freeze,
  FSTYPE_CPM => 'CP/M'.freeze,
  FSTYPE_TOPS20 => 'TOPS-20'.freeze,
  FSTYPE_NTFS => 'NTFS'.freeze,
  FSTYPE_QDOS => 'SMS/QDOS'.freeze,
  FSTYPE_ACORN => 'Acorn RISC OS'.freeze,
  FSTYPE_VFAT => 'Win32 VFAT'.freeze,
  FSTYPE_MVS => 'MVS'.freeze,
  FSTYPE_BEOS => 'BeOS'.freeze,
  FSTYPE_TANDEM => 'Tandem NSK'.freeze,
  FSTYPE_THEOS => 'Theos'.freeze,
  FSTYPE_MAC_OSX => 'Mac OS/X (Darwin)'.freeze,
  FSTYPE_ATHEOS => 'AtheOS'.freeze,
}.freeze
LOCAL_ENTRY_SIGNATURE = 
0x04034b50
LOCAL_ENTRY_STATIC_HEADER_LENGTH = 
30
LOCAL_ENTRY_TRAILING_DESCRIPTOR_LENGTH = 
4+4+4
VERSION_NEEDED_TO_EXTRACT = 
20
CENTRAL_DIRECTORY_ENTRY_SIGNATURE = 
0x02014b50
CDIR_ENTRY_STATIC_HEADER_LENGTH = 
46

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(zipfile = "", name = "", comment = "", extra = "", compressed_size = 0, crc = 0, compression_method = ZipEntry::DEFLATED, size = 0, time = DOSTime.now) ⇒ ZipEntry

Returns a new instance of ZipEntry.



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# File 'lib/zip/zip_entry.rb', line 61

def initialize(zipfile = "", name = "", comment = "", extra = "",
               compressed_size = 0, crc = 0, 
               compression_method = ZipEntry::DEFLATED, size = 0,
               time  = DOSTime.now)
  super()
  if name.start_with?("/")
    raise ZipEntryNameError, "Illegal ZipEntry name '#{name}', name must not start with /"
  end
  @localHeaderOffset = 0
  @local_header_size = 0
  @internalFileAttributes = 1
  @externalFileAttributes = 0
  @header_signature = CENTRAL_DIRECTORY_ENTRY_SIGNATURE
  @versionNeededToExtract = VERSION_NEEDED_TO_EXTRACT
  @version = 52 # this library's version
  @ftype = nil # unspecified or unknown
  @filepath = nil
  if Zip::RUNNING_ON_WINDOWS
    @fstype = FSTYPE_FAT
  else
    @fstype = FSTYPE_UNIX
  end
  @zipfile = zipfile
  @comment = comment
  @compressed_size = compressed_size
  @crc = crc
  @extra = extra
  @compression_method = compression_method
  @name = name
  @size = size
  @time = time
  @gp_flags = 0

  @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

  if name_is_directory?
    @ftype = :directory
  else
    @ftype = :file
  end

  unless ZipExtraField === @extra
    @extra = ZipExtraField.new(@extra.to_s)
  end

  @dirty = false
end

Instance Attribute Details

#comment ⇒ Object

Returns the value of attribute comment.



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

def comment
  @comment
end

#compressed_size ⇒ Object

Returns the value of attribute compressed_size.



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

def compressed_size
  @compressed_size
end

#compression_method ⇒ Object

Returns the value of attribute compression_method.



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

def compression_method
  @compression_method
end

#crc ⇒ Object

Returns the value of attribute crc.



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

def crc
  @crc
end

#dirty ⇒ Object

Returns the value of attribute dirty.



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# File 'lib/zip/zip_entry.rb', line 58

def dirty
  @dirty
end

#externalFileAttributes ⇒ Object

Returns the value of attribute externalFileAttributes.



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

def externalFileAttributes
  @externalFileAttributes
end

#extra ⇒ Object

Returns the value of attribute extra.



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

def extra
  @extra
end

#filepath ⇒ Object (readonly)

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 59

def filepath
  @filepath
end

#follow_symlinks ⇒ Object

Returns the value of attribute follow_symlinks.



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# File 'lib/zip/zip_entry.rb', line 55

def follow_symlinks
  @follow_symlinks
end

#fstype ⇒ Object

Returns the value of attribute fstype.



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

def fstype
  @fstype
end

#ftype ⇒ Object (readonly)

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 59

def ftype
  @ftype
end

#gp_flags ⇒ Object

Returns the value of attribute gp_flags.



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

def gp_flags
  @gp_flags
end

#header_signature ⇒ Object

Returns the value of attribute header_signature.



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

def header_signature
  @header_signature
end

#localHeaderOffset ⇒ Object

Returns the value of attribute localHeaderOffset.



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

def localHeaderOffset
  @localHeaderOffset
end

#name ⇒ Object

Returns the value of attribute name.



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

def name
  @name
end

#restore_ownership ⇒ Object

Returns the value of attribute restore_ownership.



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# File 'lib/zip/zip_entry.rb', line 56

def restore_ownership
  @restore_ownership
end

#restore_permissions ⇒ Object

Returns the value of attribute restore_permissions.



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# File 'lib/zip/zip_entry.rb', line 56

def restore_permissions
  @restore_permissions
end

#restore_times ⇒ Object

Returns the value of attribute restore_times.



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# File 'lib/zip/zip_entry.rb', line 56

def restore_times
  @restore_times
end

#size ⇒ Object

Returns the value of attribute size.



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

def size
  @size
end

#unix_gid ⇒ Object

Returns the value of attribute unix_gid.



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# File 'lib/zip/zip_entry.rb', line 57

def unix_gid
  @unix_gid
end

#unix_perms ⇒ Object

Returns the value of attribute unix_perms.



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# File 'lib/zip/zip_entry.rb', line 57

def unix_perms
  @unix_perms
end

#unix_uid ⇒ Object

Returns the value of attribute unix_uid.



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# File 'lib/zip/zip_entry.rb', line 57

def unix_uid
  @unix_uid
end

#zipfile ⇒ Object

Returns the value of attribute zipfile.



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

def zipfile
  @zipfile
end

Class Method Details

.read_c_dir_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 211

def read_c_dir_entry(io)  #:nodoc:all
  entry = new(io.path)
  entry.read_c_dir_entry(io)
  entry
rescue ZipError
  nil
end

.read_local_entry(io) ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 219

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

.read_zip_long(io) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 207

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/zip_entry.rb', line 203

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/zip_entry.rb', line 475

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

#==(other) ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 462

def == (other)
  return false unless other.class == self.class
  # Compares contents of local entry and exposed fields
  (@compression_method == other.compression_method &&
   @crc               == other.crc		     &&
   @compressed_size   == other.compressed_size   &&
   @size              == other.size	             &&
   @name              == other.name	             &&
   @extra             == other.extra             &&
   @filepath          == other.filepath          &&
   self.time.dos_equals(other.time))
end

#calculate_local_header_size ⇒ Object

:nodoc:all



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

def calculate_local_header_size  #:nodoc:all
  LOCAL_ENTRY_STATIC_HEADER_LENGTH + (@name ?  @name.bytesize : 0) + (@extra ? @extra.local_size : 0)
end

#cdir_header_size ⇒ Object

:nodoc:all



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

def cdir_header_size  #:nodoc:all
  CDIR_ENTRY_STATIC_HEADER_LENGTH  + (@name ?  @name.bytesize : 0) +
  (@extra ? @extra.c_dir_size : 0) + (@comment ? @comment.bytesize : 0)
end

#directory? ⇒ Boolean Also known as: is_directory

Returns true if the entry is a directory.

Returns:

  • (Boolean)

Raises:



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# File 'lib/zip/zip_entry.rb', line 140

def directory?
  raise ZipInternalError, "current filetype is unknown: #{self.inspect}" unless @ftype
  @ftype == :directory
end

#extract(destPath = @name, &onExistsProc) ⇒ Object

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



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# File 'lib/zip/zip_entry.rb', line 180

def extract(destPath = @name, &onExistsProc)
  onExistsProc ||= proc { Zip.options[:on_exists_proc] }

  if directory?
    create_directory(destPath, &onExistsProc)
  elsif file?
    write_file(destPath, &onExistsProc)
  elsif symlink?
    create_symlink(destPath, &onExistsProc)
  else
    raise RuntimeError, "unknown file type #{self.inspect}"
  end

  self
end

#file? ⇒ Boolean

Returns true if the entry is a file.

Returns:

  • (Boolean)

Raises:



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# File 'lib/zip/zip_entry.rb', line 147

def file?
  raise ZipInternalError, "current filetype is unknown: #{self.inspect}" unless @ftype
  @ftype == :file
end

#file_stat(path) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 378

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

#gather_fileinfo_from_srcpath(srcPath) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 512

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

  @filepath = srcPath
  get_extra_attributes_from_path(@filepath)
end

#get_extra_attributes_from_path(path) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 386

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

#get_input_stream(&aProc) ⇒ Object

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



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# File 'lib/zip/zip_entry.rb', line 481

def get_input_stream(&aProc)
  if @ftype == :directory
      return yield(NullInputStream.instance) if block_given?
      return NullInputStream.instance
  elsif @filepath
    case @ftype
    when :file
      return ::File.open(@filepath, "rb", &aProc)
    when :symlink
      linkpath = ::File::readlink(@filepath)
      stringio = StringIO.new(linkpath)
      return yield(stringio) if block_given?
      return stringio
    else
      raise "unknown @ftype #{@ftype}"
    end
  else
    zis = ZipInputStream.new(@zipfile, localHeaderOffset)
    zis.get_next_entry
    if block_given?
      begin
        return yield(zis)
      ensure
        zis.close
      end
    else
      return zis
    end
  end
end

#get_raw_input_stream(&aProc) ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 559

def get_raw_input_stream(&aProc)
  ::File.open(@zipfile, "rb", &aProc)
end

#local_entry_offset ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 162

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

#name_is_directory? ⇒ Boolean

:nodoc:all

Returns:

  • (Boolean) 


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# File 'lib/zip/zip_entry.rb', line 158

def name_is_directory?  #:nodoc:all
  (%r{\/$} =~ @name) != nil
end

#next_header_offset ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 175

def next_header_offset  #:nodoc:all
  local_entry_offset + self.compressed_size
end

#parent_as_string ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 553

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/zip_entry.rb', line 300

def read_c_dir_entry(io)  #:nodoc:all
  staticSizedFieldsBuf = io.read(CDIR_ENTRY_STATIC_HEADER_LENGTH)
  unless (staticSizedFieldsBuf.bytesize == CDIR_ENTRY_STATIC_HEADER_LENGTH)
    raise ZipError, "Premature end of file. Not enough data for zip cdir entry header"
  end


  @header_signature         ,
  @version                  , # version of encoding software
  @fstype                   , # filesystem type
  @versionNeededToExtract   ,
  @gp_flags                 ,
  @compression_method       ,
  lastModTime               ,
  lastModDate               ,
  @crc                      ,
  @compressed_size          ,
  @size                     ,
  nameLength                ,
  extraLength               ,
  commentLength             ,
  diskNumberStart           ,
  @internalFileAttributes   ,
  @externalFileAttributes   ,
  @localHeaderOffset        ,
  @name                     ,
  @extra                    ,
  @comment               = staticSizedFieldsBuf.unpack('VCCvvvvvVVVvvvvvVV')

  unless (@header_signature == CENTRAL_DIRECTORY_ENTRY_SIGNATURE)
    raise ZipError, "Zip local header magic not found at location '#{localHeaderOffset}'"
  end
  set_time(lastModDate, lastModTime)

  @name = io.read(nameLength)
  until @name.sub!('\\', '/') == nil do end # some zip files use backslashes instead of slashes as path separators
  if ZipExtraField === @extra
    @extra.merge(io.read(extraLength))
  else
    @extra = ZipExtraField.new(io.read(extraLength))
  end
  @comment = io.read(commentLength)
  unless (@comment && @comment.bytesize == commentLength)
    raise ZipError, "Truncated cdir zip entry header"
  end

  case @fstype
  when FSTYPE_UNIX
    @unix_perms = (@externalFileAttributes >> 16) & 07777

    case (@externalFileAttributes >> 28)
    when 04
      @ftype = :directory
    when 010
      @ftype = :file
    when 012
      @ftype = :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?
        @ftype = :directory
      else
        @ftype = :file
      end
    end
  else
    if name_is_directory?
      @ftype = :directory
    else
      @ftype = :file
    end
  end
  @local_header_size = calculate_local_header_size
end

#read_local_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 236

def read_local_entry(io)  #:nodoc:all
  @localHeaderOffset = io.tell
  staticSizedFieldsBuf = io.read(LOCAL_ENTRY_STATIC_HEADER_LENGTH)
  unless (staticSizedFieldsBuf.size == LOCAL_ENTRY_STATIC_HEADER_LENGTH)
    raise ZipError, "Premature end of file. Not enough data for zip entry local header"
  end

  @header_signature       ,
  @version          ,
  @fstype           ,
  @gp_flags          ,
  @compression_method,
  lastModTime       ,
  lastModDate       ,
  @crc              ,
  @compressed_size   ,
  @size             ,
  nameLength        ,
  extraLength       = staticSizedFieldsBuf.unpack('VCCvvvvVVVvv')

  unless (@header_signature == LOCAL_ENTRY_SIGNATURE)
    raise ZipError, "Zip local header magic not found at location '#{localHeaderOffset}'"
  end
  set_time(lastModDate, lastModTime)

  @name              = io.read(nameLength)
  extra              = io.read(extraLength)
  until @name.sub!('\\', '/') == nil do end # some zip files use backslashes instead of slashes as path separators
  if (extra && extra.bytesize != extraLength)
    raise ZipError, "Truncated local zip entry header"
  else
    if ZipExtraField === @extra
      @extra.merge(extra)
    else
      @extra = ZipExtraField.new(extra)
    end
  end
  @local_header_size = calculate_local_header_size
end

#set_extra_attributes_on_path(destPath) ⇒ Object

:nodoc:



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# File 'lib/zip/zip_entry.rb', line 395

def set_extra_attributes_on_path(destPath)	# :nodoc:
  return unless (file? or directory?)

  case @fstype
  when FSTYPE_UNIX
    # 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, destPath) if (@restore_permissions && @unix_perms)
    FileUtils::chown(@unix_uid, @unix_gid, destPath) if (@restore_ownership && @unix_uid && @unix_gid && Process::egid == 0)
    # File::utimes()
  end
end

#symlink? ⇒ Boolean

Returns true if the entry is a symlink.

Returns:

  • (Boolean)

Raises:



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# File 'lib/zip/zip_entry.rb', line 153

def symlink?
  raise ZipInternalError, "current filetype is unknown: #{self.inspect}" unless @ftype
  @ftype == :symlink
end

#time ⇒ Object Also known as: mtime 



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# File 'lib/zip/zip_entry.rb', line 120

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

#time=(aTime) ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 131

def time=(aTime)
  unless @extra.member?("UniversalTime")
    @extra.create("UniversalTime")
  end
  @extra["UniversalTime"].mtime = aTime
  @time = aTime
end

#to_s ⇒ Object 



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# File 'lib/zip/zip_entry.rb', line 196

def to_s
  @name
end

#write_c_dir_entry(io) ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 410

def write_c_dir_entry(io)  #:nodoc:all
  case @fstype
  when FSTYPE_UNIX
    ft = nil
    case @ftype
    when :file
      ft = 010
      @unix_perms ||= 0644
    when :directory
      ft = 004
      @unix_perms ||= 0755
    when :symlink
      ft = 012
      @unix_perms ||= 0755
    end

    if (!ft.nil?)
      @externalFileAttributes = (ft << 12 | (@unix_perms & 07777)) << 16
    end
  end

  tmp = [
    @header_signature,
    @version                          , # version of encoding software
    @fstype                           , # filesystem type
    @versionNeededToExtract         , # @versionNeededToExtract           ,
    @gp_flags                                 , # @gp_flags                          ,
    @compression_method               ,
    @time.to_binary_dos_time          , # @lastModTime                      ,
    @time.to_binary_dos_date          , # @lastModDate                      ,
    @crc                              ,
    @compressed_size                  ,
    @size                             ,
    @name  ?  @name.bytesize  : 0       ,
    @extra ? @extra.c_dir_length : 0  ,
    @comment ? @comment.bytesize : 0    ,
    0                                 , # disk number start
    @internalFileAttributes           , # file type (binary=0, text=1)
    @externalFileAttributes           , # native filesystem attributes
    @localHeaderOffset                ,
    @name                             ,
    @extra                            ,
    @comment                          
  ]

  io << tmp.pack('VCCvvvvvVVVvvvvvVV')

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

#write_local_entry(io) ⇒ Object

:nodoc:all



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

def write_local_entry(io)   #:nodoc:all
  @localHeaderOffset = io.tell

  io <<
  [LOCAL_ENTRY_SIGNATURE    ,
  @versionNeededToExtract , # version needed to extract
  @gp_flags                         , # @gp_flags                  ,
  @compression_method        ,
  @time.to_binary_dos_time     , # @lastModTime              ,
  @time.to_binary_dos_date     , # @lastModDate              ,
  @crc                      ,
  @compressed_size           ,
  @size                     ,
  @name ? @name.bytesize   : 0,
  @extra? @extra.local_length : 0 ].pack('VvvvvvVVVvv')
  io << @name
  io << (@extra ? @extra.to_local_bin : "")
end

#write_to_zip_output_stream(aZipOutputStream) ⇒ Object

:nodoc:all



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# File 'lib/zip/zip_entry.rb', line 542

def write_to_zip_output_stream(aZipOutputStream)  #:nodoc:all
  if @ftype == :directory
    aZipOutputStream.put_next_entry(self)
  elsif @filepath
    aZipOutputStream.put_next_entry(self)
    get_input_stream { |is| IOExtras.copy_stream(aZipOutputStream, is) }
  else
    aZipOutputStream.copy_raw_entry(self)
  end
end