public TIFFLZWDecoder(int w,
    int predictor,
    int samplesPerPixel) 
{
    
        this.w = w;
        this.predictor = predictor;
        this.samplesPerPixel = samplesPerPixel;
}

 public  void addStringToTable(byte[] string) 
{
        
        // Add this new String to the table
        stringTable[tableIndex++] = string;
        if (tableIndex == 511) {
            bitsToGet = 10;
        } else if (tableIndex == 1023) {
            bitsToGet = 11;
        } else if (tableIndex == 2047) {
            bitsToGet = 12;
        }
}

Add a new string to the string table.

 public  void addStringToTable(byte[] oldString,
    byte newString) 
{
        int length = oldString.length;
        byte string[] = new byte[length + 1];
        System.arraycopy(oldString, 0, string, 0, length);
        string[length] = newString;
        // Add this new String to the table
        stringTable[tableIndex++] = string;
        if (tableIndex == 511) {
            bitsToGet = 10;
        } else if (tableIndex == 1023) {
            bitsToGet = 11;
        } else if (tableIndex == 2047) {
            bitsToGet = 12;
        }
}

Add a new string to the string table.

 public byte[] composeString(byte[] oldString,
    byte newString) 
{
        int length = oldString.length;
        byte string[] = new byte[length + 1];
        System.arraycopy(oldString, 0, string, 0, length);
        string[length] = newString;
        return string;
}

Append newString to the end of oldString.

 public byte[] decode(byte[] data,
    byte[] uncompData,
    int h) 
{
        
        if(data[0] == (byte)0x00 && data[1] == (byte)0x01) {
            throw new UnsupportedOperationException("TIFF 5.0-style LZW codes are not supported.");
        }
        initializeStringTable();
        this.data = data;
        this.h = h;
        this.uncompData = uncompData;
        // Initialize pointers
        bytePointer = 0;
        bitPointer = 0;
        dstIndex = 0;
        nextData = 0;
        nextBits = 0;
        int code, oldCode = 0;
        byte string[];
        while ( ((code = getNextCode()) != 257) &&
        dstIndex <  uncompData.length) {
            if (code == 256) {
                initializeStringTable();
                code = getNextCode();
                if (code == 257) {
                    break;
                }
                writeString(stringTable[code]);
                oldCode = code;
            } else {
                if (code <  tableIndex) {
                    string = stringTable[code];
                    writeString(string);
                    addStringToTable(stringTable[oldCode], string[0]);
                    oldCode = code;
                } else {
                    string = stringTable[oldCode];
                    string = composeString(string, string[0]);
                    writeString(string);
                    addStringToTable(string);
                    oldCode = code;
                }
            }
        }
        // Horizontal Differencing Predictor
        if (predictor == 2) {
            int count;
            for (int j = 0; j <  h; j++) {
                count = samplesPerPixel * (j * w + 1);
                for (int i = samplesPerPixel; i <  w * samplesPerPixel; i++) {
                    uncompData[count] += uncompData[count - samplesPerPixel];
                    count++;
                }
            }
        }
        return uncompData;
}

Method to decode LZW compressed data.

 public int getNextCode() 
{
        // Attempt to get the next code. The exception is caught to make
        // this robust to cases wherein the EndOfInformation code has been
        // omitted from a strip. Examples of such cases have been observed
        // in practice.
        try {
            nextData = (nextData < <  8) | (data[bytePointer++] & 0xff);
            nextBits += 8;
            if (nextBits <  bitsToGet) {
                nextData = (nextData < <  8) | (data[bytePointer++] & 0xff);
                nextBits += 8;
            }
            int code =
            (nextData  > > (nextBits - bitsToGet)) & andTable[bitsToGet-9];
            nextBits -= bitsToGet;
            return code;
        } catch(ArrayIndexOutOfBoundsException e) {
            // Strip not terminated as expected: return EndOfInformation code.
            return 257;
        }
}

 public  void initializeStringTable() 
{
        
        stringTable = new byte[4096][];
        for (int i=0; i< 256; i++) {
            stringTable[i] = new byte[1];
            stringTable[i][0] = (byte)i;
        }
        tableIndex = 258;
        bitsToGet = 9;
}

Initialize the string table.

 public  void writeString(byte[] string) 
{
        // Fix for broken tiff files
        int max = uncompData.length - dstIndex;
        if (string.length <  max)
            max = string.length;
        System.arraycopy(string, 0, uncompData, dstIndex, max);
        dstIndex += max;
}

Write out the string just uncompressed.