Java DataInputStream Read loadColorTable(final File file)

Description

Loads the color table from the given file.

License

Open Source License

Declaration

public static float[][] loadColorTable(final File file) 

Method Source Code

//package com.java2s;
/*/*  www  .  j  a v  a2  s.  co  m*/
 * #%L
 * VisBio application for visualization of multidimensional biological
 * image data.
 * %%
 * Copyright (C) 2002 - 2014 Board of Regents of the University of
 * Wisconsin-Madison.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

import java.io.DataInputStream;

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

public class Main {
    /** Color table file length. */
    protected static final int LUT_LEN = 768;

    /** Loads the color table from the given file. */
    public static float[][] loadColorTable(final File file) {
        if (file == null || !file.exists())
            return null;
        final long fileLen = file.length();
        if (fileLen > Integer.MAX_VALUE)
            return null;
        final int offset = (int) fileLen - LUT_LEN;
        if (offset < 0)
            return null;

        // read in LUT data
        final int[] b = new int[LUT_LEN];
        try {
            final DataInputStream fin = new DataInputStream(new FileInputStream(file));
            int skipped = 0;
            while (skipped < offset)
                skipped += fin.skipBytes(offset - skipped);
            for (int i = 0; i < LUT_LEN; i++)
                b[i] = fin.readUnsignedByte();
            fin.close();
        } catch (final IOException exc) {
            return null;
        }

        // convert data to VisAD format
        final int len = LUT_LEN / 3;
        int count = 0;
        final float[][] table = new float[3][len];
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < len; j++)
                table[i][j] = b[count++] / 255f;
        }
        return table;
    }
}

Related

1. loadChecksum(Bundle b, BundleContext bc)
2. loadIntArrayFromFile(File file)
3. readBytes(DataInputStream dataStream, int numberOfBytes)
4. readBytes(DataInputStream input, int size)
5. readBytes(DataInputStream stream, int size)