Class: Omnizip::Formats::Zip::Zip64EndOfCentralDirectory

Inherits:
Object
  • Object
show all
Includes:
Constants
Defined in:
lib/omnizip/formats/zip/zip64_end_of_central_directory.rb

Overview

ZIP64 End of Central Directory Record Used when the archive exceeds ZIP format limits (>4GB or >65535 entries)

Constant Summary

Constants included from Constants

Constants::ATTR_ARCHIVE, Constants::ATTR_DIRECTORY, Constants::CENTRAL_DIRECTORY_SIGNATURE, Constants::COMPRESSION_BZIP2, Constants::COMPRESSION_DEFLATE, Constants::COMPRESSION_DEFLATE64, Constants::COMPRESSION_IMPLODED, Constants::COMPRESSION_LZMA, Constants::COMPRESSION_PPMD, Constants::COMPRESSION_REDUCED_1, Constants::COMPRESSION_REDUCED_2, Constants::COMPRESSION_REDUCED_3, Constants::COMPRESSION_REDUCED_4, Constants::COMPRESSION_SHRUNK, Constants::COMPRESSION_STORE, Constants::COMPRESSION_ZSTANDARD, Constants::DATA_DESCRIPTOR_SIGNATURE, Constants::END_OF_CENTRAL_DIRECTORY_SIGNATURE, Constants::FLAG_DATA_DESCRIPTOR, Constants::FLAG_ENCRYPTED, Constants::FLAG_STRONG_ENCRYPTION, Constants::FLAG_UTF8, Constants::LOCAL_FILE_HEADER_SIGNATURE, Constants::MAX_COMMENT_LENGTH, Constants::UNIX_DIR_PERMISSIONS, Constants::UNIX_EXTRA_FIELD_TAG, Constants::UNIX_FILE_PERMISSIONS, Constants::UNIX_SYMLINK_PERMISSIONS, Constants::VERSION_BZIP2, Constants::VERSION_DEFAULT, Constants::VERSION_DEFLATE, Constants::VERSION_LZMA, Constants::VERSION_MADE_BY_UNIX, Constants::VERSION_MADE_BY_WINDOWS, Constants::VERSION_ZIP64, Constants::ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR_SIGNATURE, Constants::ZIP64_END_OF_CENTRAL_DIRECTORY_SIGNATURE, Constants::ZIP64_EXTRA_FIELD_TAG, Constants::ZIP64_LIMIT

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(signature: ZIP64_END_OF_CENTRAL_DIRECTORY_SIGNATURE, record_size: 44, version_made_by: VERSION_MADE_BY_UNIX | VERSION_ZIP64, version_needed: VERSION_ZIP64, disk_number: 0, disk_number_with_cd: 0, total_entries_this_disk: 0, total_entries: 0, central_directory_size: 0, central_directory_offset: 0, extensible_data_sector: "") ⇒ Zip64EndOfCentralDirectory

Returns a new instance of Zip64EndOfCentralDirectory.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 17

def initialize(
  signature: ZIP64_END_OF_CENTRAL_DIRECTORY_SIGNATURE,
  record_size: 44, # Size of remaining record (not including signature and size field)
  version_made_by: VERSION_MADE_BY_UNIX | VERSION_ZIP64,
  version_needed: VERSION_ZIP64,
  disk_number: 0,
  disk_number_with_cd: 0,
  total_entries_this_disk: 0,
  total_entries: 0,
  central_directory_size: 0,
  central_directory_offset: 0,
  extensible_data_sector: ""
)
  @signature = signature
  @record_size = record_size
  @version_made_by = version_made_by
  @version_needed = version_needed
  @disk_number = disk_number
  @disk_number_with_cd = disk_number_with_cd
  @total_entries_this_disk = total_entries_this_disk
  @total_entries = total_entries
  @central_directory_size = central_directory_size
  @central_directory_offset = central_directory_offset
  @extensible_data_sector = extensible_data_sector
end

Instance Attribute Details

#central_directory_offset ⇒ Object

Returns the value of attribute central_directory_offset.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def central_directory_offset
  @central_directory_offset
end

#central_directory_size ⇒ Object

Returns the value of attribute central_directory_size.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def central_directory_size
  @central_directory_size
end

#disk_number ⇒ Object

Returns the value of attribute disk_number.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def disk_number
  @disk_number
end

#disk_number_with_cd ⇒ Object

Returns the value of attribute disk_number_with_cd.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def disk_number_with_cd
  @disk_number_with_cd
end

#extensible_data_sector ⇒ Object

Returns the value of attribute extensible_data_sector.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def extensible_data_sector
  @extensible_data_sector
end

#record_size ⇒ Object

Returns the value of attribute record_size.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def record_size
  @record_size
end

#signature ⇒ Object

Returns the value of attribute signature.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def signature
  @signature
end

#total_entries ⇒ Object

Returns the value of attribute total_entries.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def total_entries
  @total_entries
end

#total_entries_this_disk ⇒ Object

Returns the value of attribute total_entries_this_disk.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def total_entries_this_disk
  @total_entries_this_disk
end

#version_made_by ⇒ Object

Returns the value of attribute version_made_by.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def version_made_by
  @version_made_by
end

#version_needed ⇒ Object

Returns the value of attribute version_needed.



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 11

def version_needed
  @version_needed
end

Class Method Details

.from_binary(data) ⇒ Object

Parse from binary data



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 62

def self.from_binary(data)
  signature, record_size, version_made_by, version_needed,
  disk_number, disk_number_with_cd,
  total_entries_this_disk, total_entries,
  central_directory_size, central_directory_offset = data.unpack("VQvvVVQQQQ")

  unless signature == ZIP64_END_OF_CENTRAL_DIRECTORY_SIGNATURE
    raise Omnizip::FormatError,
          "Invalid ZIP64 EOCD signature"
  end

  # Extensible data sector starts after the fixed 56 bytes (4+8+2+2+4+4+8+8+8+8)
  extensible_data_sector = if data.bytesize > 56
                             data[56..]
                           else
                             ""
                           end

  new(
    signature: signature,
    record_size: record_size,
    version_made_by: version_made_by,
    version_needed: version_needed,
    disk_number: disk_number,
    disk_number_with_cd: disk_number_with_cd,
    total_entries_this_disk: total_entries_this_disk,
    total_entries: total_entries,
    central_directory_size: central_directory_size,
    central_directory_offset: central_directory_offset,
    extensible_data_sector: extensible_data_sector,
  )
end

Instance Method Details

#to_binary ⇒ Object

Serialize to binary format



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 44

def to_binary
  @record_size = 44 + extensible_data_sector.bytesize

  [
    signature,
    record_size,
    version_made_by,
    version_needed,
    disk_number,
    disk_number_with_cd,
    total_entries_this_disk,
    total_entries,
    central_directory_size,
    central_directory_offset,
  ].pack("VQvvVVQQQQ") + extensible_data_sector.b
end

#total_size ⇒ Object

Total size of this record in bytes



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# File 'lib/omnizip/formats/zip/zip64_end_of_central_directory.rb', line 96

def total_size
  12 + record_size # 4 (signature) + 8 (record_size) + record_size
end