Package com.itextpdf.io.codec

Class TIFFLZWDecoder

  • public class TIFFLZWDecoder
extends java.lang.Object
    A class for performing LZW decoding.

    • Constructor Summary

      Constructors 
      Constructor Description
      TIFFLZWDecoder​(int w, int predictor, int samplesPerPixel)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addStringToTable​(byte[] str)
      Add a new string to the string table.
      void addStringToTable​(byte[] oldString, byte newString)
      Add a new string to the string table.
      byte[] composeString​(byte[] oldString, byte newString)
      Append newString to the end of oldString.
      byte[] decode​(byte[] data, byte[] uncompData, int h)
      Method to decode LZW compressed data.
      int getNextCode()  
      void initializeStringTable()
      Initialize the string table.
      void writeString​(byte[] str)
      Write out the string just uncompressed.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • stringTable

        byte[][] stringTable

      • data

        byte[] data

      • uncompData

        byte[] uncompData

      • tableIndex

        int tableIndex

      • bitsToGet

        int bitsToGet

      • bytePointer

        int bytePointer

      • bitPointer

        int bitPointer

      • dstIndex

        int dstIndex

      • w

        int w

      • h

        int h

      • predictor

        int predictor

      • samplesPerPixel

        int samplesPerPixel

      • nextData

        int nextData

      • nextBits

        int nextBits

      • andTable

        int[] andTable

    • Constructor Detail

      • TIFFLZWDecoder

        public TIFFLZWDecoder​(int w,
                      int predictor,
                      int samplesPerPixel)

    • Method Detail

      • decode

        public byte[] decode​(byte[] data,
                     byte[] uncompData,
                     int h)
        Method to decode LZW compressed data.
        Parameters:
        data - The compressed data
        uncompData - Array to return the uncompressed data in
        h - The number of rows the compressed data contains
        Returns:
        The decoded data

      • initializeStringTable

        public void initializeStringTable()
        Initialize the string table.

      • writeString

        public void writeString​(byte[] str)
        Write out the string just uncompressed.
        Parameters:
        str - the byte string for uncompressed write out

      • addStringToTable

        public void addStringToTable​(byte[] oldString,
                             byte newString)
        Add a new string to the string table.
        Parameters:
        oldString - the byte string at the end of which the new string will be written and which will be added to the string table
        newString - the byte to be written to the end of the old string

      • addStringToTable

        public void addStringToTable​(byte[] str)
        Add a new string to the string table.
        Parameters:
        str - the byte string which will be added to the string table

      • composeString

        public byte[] composeString​(byte[] oldString,
                            byte newString)
        Append newString to the end of oldString.
        Parameters:
        oldString - the byte string at the end of which the new string will be written
        newString - the byte to be written to the end of the old string
        Returns:
        the byte string which is the sum of the new string and the old string

      • getNextCode

        public int getNextCode()