Class: Zipline::OutputStream

Inherits:
Zip::OutputStream
  • Object
show all
Defined in:
lib/ext/zipline/output_stream.rb

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ OutputStream

we need to be able to hand out own custom output in order to stream to browser



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# File 'lib/ext/zipline/output_stream.rb', line 14

def initialize(io)
  # Create an io stream thing
  super StringIO.new, true
  # Overwrite it with my own
  @output_stream = io
end

Instance Method Details

#current_entry ⇒ Object

helper to deal with difference between rubyzip 1.0 and 1.1



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# File 'lib/ext/zipline/output_stream.rb', line 58

def current_entry
  @currentEntry || @current_entry
end

#finalize_current_entry ⇒ Object

just reset state, no rewinding required



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# File 'lib/ext/zipline/output_stream.rb', line 40

def finalize_current_entry
  if current_entry
    entry = current_entry
    super
    write_local_footer(entry)
  end
end

#put_next_entry(entry_name, size) ⇒ Object 



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# File 'lib/ext/zipline/output_stream.rb', line 25

def put_next_entry(entry_name, size)
  new_entry = Zip::Entry.new(@file_name, entry_name)

  #THIS IS THE MAGIC, tells zip to look after data for size, crc
  new_entry.gp_flags = new_entry.gp_flags | 0x0008

  super(new_entry)

  # Uncompressed size in the local file header must be zero when bit 3
  # of the general purpose flags is set, so set the size after the header
  # has been written.
  new_entry.size = size
end

#stream ⇒ Object 



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# File 'lib/ext/zipline/output_stream.rb', line 21

def stream
  @output_stream
end

#update_local_headers ⇒ Object

never need to do this because we set correct sizes up front



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# File 'lib/ext/zipline/output_stream.rb', line 53

def update_local_headers
  nil
end

#write_local_footer(entry) ⇒ Object 



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# File 'lib/ext/zipline/output_stream.rb', line 48

def write_local_footer(entry)
  @output_stream << [ 0x08074b50, entry.crc, entry.compressed_size, entry.size].pack('VVVV')
end