Class: BRS::Stream::Raw::Compressor

Inherits:
Abstract
  • Object
show all
Defined in:
lib/brs/stream/raw/compressor.rb

Constant Summary collapse

BUFFER_LENGTH_NAMES = 
i[destination_buffer_length].freeze

Instance Method Summary collapse

Methods inherited from Abstract

#closed?

Constructor Details

#initialize(options = {}) ⇒ Compressor

Returns a new instance of Compressor.



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# File 'lib/brs/stream/raw/compressor.rb', line 17

def initialize(options = {})
  options = Option.get_compressor_options options, BUFFER_LENGTH_NAMES

  size_hint = options[:size_hint]
  Validation.validate_not_negative_integer size_hint unless size_hint.nil?

  native_stream = NativeCompressor.new options

  super native_stream
end

Instance Method Details

#close(&writer) ⇒ Object 



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# File 'lib/brs/stream/raw/compressor.rb', line 78

def close(&writer)
  return nil if closed?

  Validation.validate_proc writer

  loop do
    need_more_destination = @native_stream.finish

    if need_more_destination
      flush_destination_buffer(&writer)
      next
    end

    break
  end

  super

  nil
end

#flush(&writer) ⇒ Object 



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# File 'lib/brs/stream/raw/compressor.rb', line 57

def flush(&writer)
  do_not_use_after_close

  Validation.validate_proc writer

  loop do
    need_more_destination = @native_stream.flush

    if need_more_destination
      flush_destination_buffer(&writer)
      next
    end

    break
  end

  super

  nil
end

#write(source, &writer) ⇒ Object 



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# File 'lib/brs/stream/raw/compressor.rb', line 28

def write(source, &writer)
  do_not_use_after_close

  Validation.validate_string source
  Validation.validate_proc writer

  total_bytes_written = 0

  loop do
    bytes_written, need_more_destination  = @native_stream.write source
    total_bytes_written                  += bytes_written

    if need_more_destination
      source = source.byteslice bytes_written, source.bytesize - bytes_written
      flush_destination_buffer(&writer)
      next
    end

    unless bytes_written == source.bytesize
      # Compressor write should eat all provided "source" without remainder.
      raise UnexpectedError, "unexpected error"
    end

    break
  end

  total_bytes_written
end