Class: TreasureData::FileReader::DecompressIOFilter

Inherits:
Object
  • Object
show all
Defined in:
lib/td/file_reader.rb

Class Method Summary collapse

Class Method Details

.filter(io, error, opts) ⇒ Object 



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# File 'lib/td/file_reader.rb', line 17

def self.filter(io, error, opts)
  case opts[:compress]
  when 'gzip'
    return Zlib::GzipReader.new(io)
  when 'plain'
    return io
  when nil
    data = io.read(2)
    io.rewind
    if data.unpack('CC') == [0x1f, 0x8b]
      return Zlib::GzipReader.new(io)
    else
      return io
    end
  else
    raise "unknown compression type #{opts[:compress]}"
  end
end