Class: Zip64::ZipWriter
- Inherits:
-
Object
- Object
- Zip64::ZipWriter
- Defined in:
- lib/zip64/writer.rb
Direct Known Subclasses
Class Method Summary collapse
Instance Method Summary collapse
- #add_entry(io, info) ⇒ Object
- #add_link(target, info) ⇒ Object
- #close ⇒ Object
- #ensure_metadata(io, info) ⇒ Object
-
#initialize(io) ⇒ ZipWriter
constructor
A new instance of ZipWriter.
- #local_header_max ⇒ Object
- #make_entry(info, data, crc) ⇒ Object
- #make_entry32(info, data, crc) ⇒ Object
- #make_entry64(info, data, crc) ⇒ Object
- #threshold ⇒ Object
- #write_central_directory ⇒ Object
- #write_end_of_central_directory_record ⇒ Object
- #write_zip64_end_of_central_directory ⇒ Object
- #write_zip64_end_of_central_directory_locator ⇒ Object
Constructor Details
#initialize(io) ⇒ ZipWriter
Returns a new instance of ZipWriter.
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# File 'lib/zip64/writer.rb', line 27 def initialize(io) @io, @offset = io, 0 @dir_entries = [] if block_given? yield(self) close end end |
Class Method Details
.get_io_size(io) ⇒ Object
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# File 'lib/zip64/writer.rb', line 280 def self.get_io_size(io) if io.respond_to?(:stat) size = io.stat.size elsif io.respond_to?(:size) size = io.size else pos = io.tell io.seek(0, IO::SEEK_END) size = io.tell io.seek(pos, IO::SEEK_START) end size end |
.predict_size64(files) ⇒ Object
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# File 'lib/zip64/writer.rb', line 294 def self.predict_size64(files) file_overhead = LocalFileHeader.base_size + Zip64ExtraField.base_size cd_overhead = CDFileHeader.base_size + Zip64CDExtraField.base_size total = 0 names_size = 0 dolls = 0 doll_names_size = 0 files.each do |file| names_size += file[:name].size total += get_io_size(file[:io]) + file[:name].size + file_overhead if file[:russiandolls] file[:russiandolls].each do |doll| total += doll[:name].size + file_overhead + 4 dolls += 1 doll_names_size += doll[:name].size end end end until (total%4).zero? total += 1 end total += files.size * cd_overhead total += names_size total += dolls * cd_overhead total += doll_names_size total += EOCDR.base_size + Zip64EOCDL.base_size + Zip64EOCDR.base_size total end |
Instance Method Details
#add_entry(io, info) ⇒ Object
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# File 'lib/zip64/writer.rb', line 113 def add_entry(io, info) info = (io, info) data = io.read.to_s crc = Zlib.crc32(data, 0) # XXX: this doesn't fit well with the planned usage :( entry = { :offset => @offset, :len => data.size } @dir_entries << entry header = make_entry(info, data, crc) entry[:zip64] = header.zip64? if info[:russiandolls] first_header = header last_header = header info[:russiandolls].each_with_index do |doll,index| io.rewind doll_header = make_entry(info.merge(doll), data, crc) doll_prefix = [0x4343, doll_header.size].pack('vv') if (doll_header.to_string.size + doll_prefix.size) + first_header.to_string.size > local_header_max STDERR.puts "Can't add any more dolls! Dolls #{index}-#{dolls.size-1} omitted." else offset = @offset + first_header.to_string.size + doll_prefix.size last_header.extra_field << doll_prefix << doll_header @dir_entries << { :offset => offset, :len => data.size, :local_header => doll_header, :zip64 => doll_header.zip64? } last_header = doll_header end end end entry[:local_header] = header # write output write header.to_string # write data (& any compression?) write data # write descriptor - not need with current strategy # write DD64.new(:crc32 => crc, # :data_len => data.size, # :raw_data_len => data.size).to_string end |
#add_link(target, info) ⇒ Object
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# File 'lib/zip64/writer.rb', line 91 def add_link(target, info) info = (nil, info) crc = Zlib.crc32('', 0) make_entry(info, '', crc) entry = { :offset => @offset, :len => 0 } @dir_entries << entry header = make_entry(info, '', crc) header.extra_field.push(UnixExtraField.new(:atime => info[:mtime].to_i, :mtime => info[:mtime].to_i, :uid => info[:uid].to_i, :gid => info[:gid].to_i, :data => target)) entry[:zip64] = header.zip64? entry[:local_header] = header # write output write header.to_string end |
#close ⇒ Object
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# File 'lib/zip64/writer.rb', line 257 def close # [archive decryption header] # ignore # [archive extra data record] # ignore # [central directory] write_central_directory() if @dir_entries.any? { |entry| entry[:zip64] } # [zip64 end of central directory record] write_zip64_end_of_central_directory() # [zip64 end of central directory locator] write_zip64_end_of_central_directory_locator() end # [end of central directory record] write_end_of_central_directory_record() write_last() end |
#ensure_metadata(io, info) ⇒ Object
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# File 'lib/zip64/writer.rb', line 36 def (io, info) info = info.dup info[:mtime] ||= Time.now info[:gid] ||= Process.gid info[:uid] ||= Process.uid info[:name] ||= File.basename(io.path) if io.respond_to?(:path) && io.path info[:name] ||= "file-#{@dir_entries.size+2}.dat" info end |
#local_header_max ⇒ Object
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# File 'lib/zip64/writer.rb', line 168 def local_header_max 1024 * 64 end |
#make_entry(info, data, crc) ⇒ Object
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# File 'lib/zip64/writer.rb', line 83 def make_entry(info, data, crc) if info[:use] == 64 || @offset + data.size > self.threshold header = make_entry64(info, data, crc) else header = make_entry32(info, data, crc) end end |
#make_entry32(info, data, crc) ⇒ Object
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# File 'lib/zip64/writer.rb', line 49 def make_entry32(info, data, crc) header = LocalFileHeader.new( :flags => (1<<11), :compression => 0, :last_mod_file_time => Zip64.time_to_msdos_time(info[:mtime]), :last_mod_file_date => Zip64.date_to_msdos_date(info[:mtime]), :crc32 => crc, :data_len => data.size, :raw_data_len => data.size, :filename => info[:name], :extra_field => '') header end |
#make_entry64(info, data, crc) ⇒ Object
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# File 'lib/zip64/writer.rb', line 64 def make_entry64(info, data, crc) header = LocalFileHeader.new( :flags => 0, :last_mod_file_time => Zip64.time_to_msdos_time(info[:mtime]), :last_mod_file_date => Zip64.date_to_msdos_date(info[:mtime]), :crc32 => crc, :data_len => LEN64, :raw_data_len => LEN64, :filename => info[:name], :extra_field => Zip64ExtraField.new( :header_id => Zip64ExtraField::ID, :header_len => 16, :raw_data_len => data.size, :data_len => data.size) ) header end |
#threshold ⇒ Object
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# File 'lib/zip64/writer.rb', line 172 def threshold 1024 * # kb 1024 * # mb 1024 * # gb 2 - local_header_max end |
#write_central_directory ⇒ Object
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# File 'lib/zip64/writer.rb', line 179 def write_central_directory align @central_directory_offset = @offset @dir_entries.each do |entry| offset = entry[:offset] len = entry[:len] header = entry[:local_header] extra_field = Zip64CDExtraField.new( :data_len => len, :raw_data_len => len, :relative_offset => offset, :disk_no => 0 ) write CDFileHeader.new( :flags => header.flags, :compression => header.compression, :made_by => (3 << 8), :last_mod_file_time => header.last_mod_file_time, :last_mod_file_date => header.last_mod_file_date, :crc32 => header.crc32, :data_len => entry[:zip64] ? LEN64 : len, :raw_data_len => entry[:zip64] ? LEN64 : len, :filename => header.filename, :extra_field => entry[:zip64] ? extra_field.to_string : '', :file_comment => '', :disk_no => entry[:zip64] ? 0xffff : 0, :internal_file_attributes => 0, :external_file_attributes => 0, :rel_offset_of_local_header => entry[:zip64] ? LEN64 : offset ).to_string end # Central Directory Size @central_directory_size = @offset - @central_directory_offset end |
#write_end_of_central_directory_record ⇒ Object
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# File 'lib/zip64/writer.rb', line 244 def write_end_of_central_directory_record #align write EOCDR.new( :disk_no => 0, :disk_with_cd_no => 0, :total_entries_in_local_cd => @dir_entries.size, :total_entries => @dir_entries.size, :cd_size => @central_directory_size, :offset_to_cd_start => @central_directory_offset, :file_comment => '' ).to_string end |
#write_zip64_end_of_central_directory ⇒ Object
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# File 'lib/zip64/writer.rb', line 217 def write_zip64_end_of_central_directory #align @zip64_central_directory_offset = @offset write Zip64EOCDR.new( :made_by => 3 << 8, :this_disk_no => 0, :disk_with_cd_no => 0, :total_no_entries_on_this_disk => @dir_entries.size, :total_no_entries => @dir_entries.size, :size_of_cd => @central_directory_size, :offset_of_cd_wrt_disk_no => @central_directory_offset, :data => '' ).to_string end |
#write_zip64_end_of_central_directory_locator ⇒ Object
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# File 'lib/zip64/writer.rb', line 233 def write_zip64_end_of_central_directory_locator #align write Zip64EOCDL.new( :disk_with_z64_eocdr => 0, # Assume relative offset is relative to disk, as # is case elsewhere in Zip spec :relative_offset => @zip64_central_directory_offset, :no_disks => 1 ).to_string end |