Package com.sun.pdfview.decode

Class ASCII85Decode

  • public class ASCII85Decode
extends java.lang.Object
    decode ASCII85 text into a byte array.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private java.nio.ByteBuffer buf  

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private ASCII85Decode​(java.nio.ByteBuffer buf)
      initialize the decoder with byte buffer in ASCII85 format

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private java.nio.ByteBuffer decode()
      decode the bytes
      static java.nio.ByteBuffer decode​(java.nio.ByteBuffer buf, PDFObject params)
      decode an array of bytes in ASCII85 format.
      private boolean decode5​(java.io.ByteArrayOutputStream baos)
      decode the next five ASCII85 characters into up to four decoded bytes.
      private int nextChar()
      get the next character from the input.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • buf

        private java.nio.ByteBuffer buf

    • Constructor Detail

      • ASCII85Decode

        private ASCII85Decode​(java.nio.ByteBuffer buf)
        initialize the decoder with byte buffer in ASCII85 format

    • Method Detail

      • nextChar

        private int nextChar()
        get the next character from the input.
        Returns:
        the next character, or -1 if at end of stream

      • decode5

        private boolean decode5​(java.io.ByteArrayOutputStream baos)
                 throws PDFParseException
        decode the next five ASCII85 characters into up to four decoded bytes. Return false when finished, or true otherwise.
        Parameters:
        baos - the ByteArrayOutputStream to write output to, set to the correct position
        Returns:
        false when finished, or true otherwise.
        Throws:
        PDFParseException

      • decode

        public static java.nio.ByteBuffer decode​(java.nio.ByteBuffer buf,
                                         PDFObject params)
                                  throws PDFParseException
        decode an array of bytes in ASCII85 format.

        In ASCII85 format, every 5 characters represents 4 decoded bytes in base 85. The entire stream can contain whitespace, and ends in the characters '~>'.

        Parameters:
        buf - the encoded ASCII85 characters in a byte buffer
        params - parameters to the decoder (ignored)
        Returns:
        the decoded bytes
        Throws:
        PDFParseException