Class LZWDecode
- java.lang.Object
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- com.sun.pdfview.decode.LZWDecode
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public class LZWDecode extends java.lang.Object
decode an LZW-encoded array of bytes. LZW is a patented algorithm.Feb 21, 2009 Legal statement on Intellectual Property from Unisys
LZW Patent Information (http://www.unisys.com/about__unisys/lzw) License Information on GIF and Other LZW-based Technologies
Unisys U.S. LZW Patent No. 4,558,302 expired on June 20, 2003, the counterpart patents in the United Kingdom, France, Germany and Italy expired on June 18, 2004, the Japanese counterpart patents expired on June 20, 2004 and the counterpart Canadian patent expired on July 7, 2004.
Unisys Corporation holds and has patents pending on a number of improvements on the inventions claimed in the above-expired patents. Information on these improvement patents and terms under which they may be licensed can be obtained by contacting the following:
Unisys Corporation Welch Patent Licensing Department Mail Stop E8-114 Unisys Way Blue Bell, PA 19424
Via the Internet, send email to Robert.Marley@unisys.com.
Via facsimile, send inquiries to Welch Patent Licensing Department at 215-986-3090.
The above is presented for information purposes only, and is subject to change by Unisys. Additionally, this information should not be considered as legally obligating Unisys in any way with regard to license availability, or as to the terms and conditions offered for a license, or with regard to the interpretation of any license agreements. You should consult with your own legal counsel regarding your particular situation.
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Field Summary
Fields Modifier and Type Field Description (package private) int
bitpos
(package private) int
bitspercode
(package private) java.nio.ByteBuffer
buf
(package private) int
bytepos
(package private) static int
CLEARDICT
(package private) byte[][]
dict
(package private) int
dictlen
(package private) static int
STOP
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Constructor Summary
Constructors Modifier Constructor Description private
LZWDecode(java.nio.ByteBuffer buf)
initialize this decoder with an array of encoded bytes
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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 LZW-encoded bytes to a byte array.private int
nextCode()
get the next code from the input streamprivate void
resetDict()
reset the dictionary to the initial 258 entries
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Constructor Detail
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LZWDecode
private LZWDecode(java.nio.ByteBuffer buf) throws PDFParseException
initialize this decoder with an array of encoded bytes- Parameters:
buf
- the buffer of bytes- Throws:
PDFParseException
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Method Detail
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resetDict
private void resetDict()
reset the dictionary to the initial 258 entries
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nextCode
private int nextCode()
get the next code from the input stream
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decode
private java.nio.ByteBuffer decode() throws PDFParseException
decode the array.- Returns:
- the uncompressed byte array
- Throws:
PDFParseException
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decode
public static java.nio.ByteBuffer decode(java.nio.ByteBuffer buf, PDFObject params) throws java.io.IOException
decode an array of LZW-encoded bytes to a byte array.- Parameters:
buf
- the buffer of encoded bytesparams
- parameters for the decoder (unused)- Returns:
- the decoded uncompressed bytes
- Throws:
java.io.IOException
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