Class: Ccrypto::Java::Compression

Inherits:
Object
  • Object
show all
Includes:
DataConversion, TR::CondUtils
Defined in:
lib/ccrypto/java/engines/compression_engine.rb

Instance Method Summary collapse

Methods included from DataConversion

#from_b64, #from_b64_mime, #from_hex, included, #logger, #to_b64, #to_b64_mime, #to_bin, #to_hex, #to_java_bytes, #to_str

Constructor Details

#initialize(*args, &block) ⇒ Compression

Returns a new instance of Compression.

Raises:

  • (CompressionError) 


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# File 'lib/ccrypto/java/engines/compression_engine.rb', line 10

def initialize(*args, &block)

  @config = args.first
  raise CompressionError, "Compress Config is expected. Given #{@config}" if not @config.is_a?(Ccrypto::CompressionConfig)
  
  case @config.level
  when :best_compression
    teLogger.debug "Compression with best compression"
    @eng = java.util.zip.Deflater.new(java.util.zip.Deflater::BEST_COMPRESSION)
  when :best_speed
    teLogger.debug "Compression with best speed"
    @eng = java.util.zip.Deflater.new(java.util.zip.Deflater::BEST_SPEED)
  when :no_compression
    teLogger.debug "No compression"
    @eng = java.util.zip.Deflater.new(java.util.zip.Deflater::NO_COMPRESSION)
  else
    teLogger.debug "Default compression"
    @eng = java.util.zip.Deflater.new(java.util.zip.Deflater::DEFAULT_COMPRESSION)
  end

  teLogger.debug "Default strategy"
  @eng.setStrategy(java.util.zip.Deflater::DEFAULT_STRATEGY)

  @os = java.io.ByteArrayOutputStream.new
  
end

Instance Method Details

#final ⇒ Object 



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# File 'lib/ccrypto/java/engines/compression_engine.rb', line 59

def final
     
end

#update(val) ⇒ Object

returns compressed output length



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# File 'lib/ccrypto/java/engines/compression_engine.rb', line 38

def update(val)
  if val.length > 0
    teLogger.debug "Given #{val.length} bytes for compression"

    @eng.setInput(to_java_bytes(val))

    @eng.finish

    baos = java.io.ByteArrayOutputStream.new
    buf = ::Java::byte[READ_BUF_SIZE].new
    while not @eng.finished
      done = @eng.deflate(buf)
      @os.write(buf,0,done)
    end

    @os.toByteArray
  else
    ::Java::byte[0].new
  end
end