Package totalcross.util.pdf

Class ASCII85Encoder

  • public class ASCII85Encoder
extends java.lang.Object
    This class encodes a binary stream into a text stream.

    The ASCII85encoding is suitable when binary data needs to be transmitted or stored as text. It has been defined by Adobe for the PostScript and PDF formats (see PDF Reference, section 3.3 Details of Filtered Streams).

    The encoded stream is about 25% larger than the corresponding binary stream (32 binary bits are converted into 40 encoded bits, and there may be start/end of line markers).

    • Constructor Summary

      Constructors 
      Constructor Description
      ASCII85Encoder​(Stream out)
      Create an encoder wrapping a sink of binary data.
      ASCII85Encoder​(Stream out, int lineLength, byte[] sol, byte[] eol)
      Create an encoder wrapping a sink of binary data.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()
      Closes this output stream and releases any system resources associated with the stream.
      void write​(int b)
      Writes the specified byte to this output stream.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ASCII85Encoder

        public ASCII85Encoder​(Stream out)
        Create an encoder wrapping a sink of binary data.
        Parameters:
        out - sink of binary data to filter

      • ASCII85Encoder

        public ASCII85Encoder​(Stream out,
                      int lineLength,
                      byte[] sol,
                      byte[] eol)
        Create an encoder wrapping a sink of binary data.

        The additional arguments allow to specify some text formatting

        Note that specifying a negative number for lineLength is really equivalent to calling the one argument.

        If non-null start/end of line are used, they must contain only whitespace characters as other characters would otherwise interfere with the decoding process on the other side of the channel. For safety, it is recommended to stick to space (' ', 0x32) and horizontal tabulation ('\t', 0x9) characters for the start of line marker, and to line feed ('\n', 0xa) and carriage return ('\r', 0xd) characters according to the platform convention for the end of line marker.

        Parameters:
        out - sink of binary data to filter
        lineLength - maximal length of a ligne (counting sol but not counting eol), if negative lines will not be split
        sol - start of line marker to use (mainly for indentation purposes), may be null
        eol - end of line marker to use, may be null only if lineLength is negative

    • Method Detail

      • close

        public void close()
           throws IOException
        Closes this output stream and releases any system resources associated with the stream.
        Throws:
        IOException

      • write

        public void write​(int b)
           throws IOException
        Writes the specified byte to this output stream.
        Parameters:
        b - byte to write (only the 8 low order bits are used)
        Throws:
        IOException