Contents

require 'zlib'

module CcipherFactory 
  module Compression
    module ZlibDecompressor
      include CcipherFactory::Common

      def decompress_init(*args, &block)

        if block
          instance_eval(&block)
          decompress_final
        else
          self
        end

      end

      def decompress_update_meta(val)
        if @decompressor.nil?
          begin
            intOutputBuf.write(val)
            Encoding.extract_meta(intOutputBuf) do |meta, bal|
              ts = BinStruct.instance.struct_from_bin(meta)

              case ts.oid
              when BTag.constant_value(:compression_zlib)
                @decompressor = Ccrypto::UtilFactory.instance(:decompression)
              else
                raise DecompressionError, "Unknown compression type '#{ts.id}'"
              end

              decompress_update(bal)
            end
          rescue Encoding::InsufficientData => e
          end
        else
          decompress_update(val)
        end
      end

      def decompress_update(val)
        if val.length > 0
          check_state
          begin
            res = @decompressor.update(val)
            write_to_output(res)
            res
          rescue Exception => ex
            raise DecompressionError, ex
          end
        end
      end

      def decompress_final
        @decompressor.final
      end

      private
      def check_state
        raise DecompressionError, "Please call decompress_update_meta() to setup the state first." if @decompressor.nil?
      end

    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
ccipher_factory-0.1.2	lib/ccipher_factory/compression/zlib_decompressor.rb
ccipher_factory-0.1.1	lib/ccipher_factory/compression/zlib_decompressor.rb
ccipher_factory-0.1.0	lib/ccipher_factory/compression/zlib_decompressor.rb