public class: RunLengthDecodeFilter
All Implemented Interfaces:
This is a filter for the RunLength Decoder.
From the PDF Reference
The RunLengthDecode filter decodes data that has been encoded in a simple
byte-oriented format based on run length. The encoded data is a sequence of
runs, where each run consists of a length byte followed by 1 to 128 bytes of data. If
the length byte is in the range 0 to 127, the following length + 1 (1 to 128) bytes
are copied literally during decompression. If length is in the range 129 to 255, the
following single byte is to be copied 257 ? length (2 to 128) times during decompression.
A length value of 128 denotes EOD.
The compression achieved by run-length encoding depends on the input data. In
the best case (all zeros), a compression of approximately 64:1 is achieved for long
files. The worst case (the hexadecimal sequence 00 alternating with FF) results in
an expansion of 127:128.
|Method from org.apache.pdfbox.filter.RunLengthDecodeFilter Summary:|
|Methods from java.lang.Object:|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait|