Class: Zip::ZipOutputStream

Inherits:
Object show all
Includes:
IOExtras::AbstractOutputStream
Defined in:
lib/pik/contrib/zip/zip.rb

Overview

ZipOutputStream is the basic class for writing zip files. It is possible to create a ZipOutputStream object directly, passing the zip file name to the constructor, but more often than not the ZipOutputStream will be obtained from a ZipFile (perhaps using the ZipFileSystem interface) object for a particular entry in the zip archive.

A ZipOutputStream inherits IOExtras::AbstractOutputStream in order to provide an IO-like interface for writing to a single zip entry. Beyond methods for mimicking an IO-object it contains the method put_next_entry that closes the current entry and creates a new.

Please refer to ZipInputStream for example code.

java.util.zip.ZipOutputStream is the original inspiration for this class.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from IOExtras::AbstractOutputStream

#print, #printf, #putc, #puts, #write

Methods included from IOExtras::FakeIO

#kind_of?

Constructor Details

#initialize(fileName) ⇒ ZipOutputStream

Opens the indicated zip file. If a file with that name already exists it will be overwritten.



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# File 'lib/pik/contrib/zip/zip.rb', line 919

def initialize(fileName)
  super()
  @fileName = fileName
  @outputStream = File.new(@fileName, "wb")
  @entrySet = ZipEntrySet.new
  @compressor = NullCompressor.instance
  @closed = false
  @currentEntry = nil
  @comment = nil
end

Instance Attribute Details

#comment ⇒ Object

Returns the value of attribute comment.



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# File 'lib/pik/contrib/zip/zip.rb', line 915

def comment
  @comment
end

Class Method Details

.open(fileName) ⇒ Object

Same as #initialize but if a block is passed the opened stream is passed to the block and closed when the block returns.



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# File 'lib/pik/contrib/zip/zip.rb', line 933

def ZipOutputStream.open(fileName)
  return new(fileName) unless block_given?
  zos = new(fileName)
  yield zos
ensure
  zos.close if zos
end

Instance Method Details

#<<(data) ⇒ Object

Modeled after IO.<<



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# File 'lib/pik/contrib/zip/zip.rb', line 1029

def << (data)
  @compressor << data
end

#close ⇒ Object

Closes the stream and writes the central directory to the zip file



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# File 'lib/pik/contrib/zip/zip.rb', line 942

def close
  return if @closed
  finalize_current_entry
  update_local_headers
  write_central_directory
  @outputStream.close
  @closed = true
end

#copy_raw_entry(entry) ⇒ Object

Raises:



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# File 'lib/pik/contrib/zip/zip.rb', line 960

def copy_raw_entry(entry)
  entry = entry.dup
  raise ZipError, "zip stream is closed" if @closed
  raise ZipError, "entry is not a ZipEntry" if !entry.kind_of?(ZipEntry)
  finalize_current_entry
  @entrySet << entry
  src_pos = entry.local_entry_offset
  entry.write_local_entry(@outputStream)
  @compressor = NullCompressor.instance
  @outputStream << entry.get_raw_input_stream { 
	|is| 
	is.seek(src_pos, IO::SEEK_SET)
	is.read(entry.compressed_size)
  }
  @compressor = NullCompressor.instance
  @currentEntry = nil
end

#put_next_entry(entry, level = Zlib::DEFAULT_COMPRESSION) ⇒ Object

Closes the current entry and opens a new for writing. entry can be a ZipEntry object or a string.

Raises:



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# File 'lib/pik/contrib/zip/zip.rb', line 953

def put_next_entry(entry, level = Zlib::DEFAULT_COMPRESSION)
  raise ZipError, "zip stream is closed" if @closed
  newEntry = entry.kind_of?(ZipEntry) ? entry : ZipEntry.new(@fileName, entry.to_s)
  init_next_entry(newEntry, level)
  @currentEntry=newEntry
end