Package com.sun.pdfview.decode

Class RunLengthDecode

  • public class RunLengthDecode
extends java.lang.Object
    decode an array of Run Length encoded bytes into a byte array

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private java.nio.ByteBuffer buf  
      private static int RUN_LENGTH_EOD
      the end of data in the RunLength encoding.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private RunLengthDecode​(java.nio.ByteBuffer buf)
      initialize the decoder with an array of bytes in RunLength format

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private java.nio.ByteBuffer decode()
      decode the array
      static java.nio.ByteBuffer decode​(java.nio.ByteBuffer buf, PDFObject params)
      decode an array of bytes in RunLength format.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • RUN_LENGTH_EOD

        private static final int RUN_LENGTH_EOD
        the end of data in the RunLength encoding.
        See Also:
        Constant Field Values

      • buf

        private java.nio.ByteBuffer buf

    • Constructor Detail

      • RunLengthDecode

        private RunLengthDecode​(java.nio.ByteBuffer buf)
        initialize the decoder with an array of bytes in RunLength format

    • Method Detail

      • decode

        public static java.nio.ByteBuffer decode​(java.nio.ByteBuffer buf,
                                         PDFObject params)
                                  throws PDFParseException
        decode an array of bytes in RunLength format.

        RunLength format consists of a sequence of a byte-oriented format based on run length. There are a series of "runs", where a run is a length byte followed by 1 to 128 bytes of data. If the length is 0-127, the following length+1 (1 to 128) bytes are to be copied. If the length is 129 through 255, the following single byte is copied 257-length (2 to 128) times. A length value of 128 means and End of Data (EOD).

        Parameters:
        buf - the RUnLEngth encoded bytes in a byte buffer
        params - parameters to the decoder (ignored)
        Returns:
        the decoded bytes
        Throws:
        PDFParseException