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/*
 * JCudaUtils - Utilities for JCuda 
 * http://www.jcuda.org
 *
 * Copyright (c) 2010 Marco Hutter - http://www.jcuda.org
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

package jcuda.utils;

import java.io.*;
import java.util.*;
import java.util.regex.Pattern;

import jcuda.CudaException;

/**
 * File I/O functions, similar to the CUTIL file functions
 */
public class FileIO
{
    /**
     * Private constructor to prevent instantiation
     */
    private FileIO()
    {
    }
    
    /**
     * Reads the file with the given name containing single precision floating 
     * point data, and returns the contents of this file as an array
     * 
     * @param filename The name of the file
     * @return The contents of the file
     * @throws CudaException if the file could not be read
     */
    public static float[] readFileFloat(String filename)
    {
        if (filename == null)
        {
            throw new CudaException("The filename is null");
        }

        List values = new ArrayList();
        try 
        {
            Scanner scanner = new Scanner(new File(filename));
            scanner.useDelimiter(Pattern.compile("\\s+"));
            while (scanner.hasNext()) 
            {
                try
                {
                    values.add(Float.parseFloat(scanner.next()));
                } 
                catch (NumberFormatException e)
                {
                    throw new CudaException(
                        "Could not read value from file '"+filename+"'", e);
                }
            }
            scanner.close();
        }
        catch (FileNotFoundException e)
        {
            throw new CudaException("File '"+filename+"' not found", e);
        }

        float data[] = new float[values.size()];
        for (int i=0; i values = new ArrayList();
        try 
        {
            Scanner scanner = new Scanner(new File(filename));
            scanner.useDelimiter(Pattern.compile("\\s+"));
            while (scanner.hasNext()) 
            {
                try
                {
                    values.add(Double.parseDouble(scanner.next()));
                } 
                catch (NumberFormatException e)
                {
                    throw new CudaException(
                        "Could not read value from file '"+filename+"'", e);
                }
            }
            scanner.close();
        }
        catch (FileNotFoundException e)
        {
            throw new CudaException("File '"+filename+"' not found", e);
        }

        double data[] = new double[values.size()];
        for (int i=0; i values = new ArrayList();
        try 
        {
            Scanner scanner = new Scanner(new File(filename));
            scanner.useDelimiter(Pattern.compile("\\s+"));
            while (scanner.hasNext()) 
            {
                try
                {
                    values.add(Integer.parseInt(scanner.next()));
                } 
                catch (NumberFormatException e)
                {
                    throw new CudaException(
                        "Could not read value from file '"+filename+"'", e);
                }
            }
            scanner.close();
        }
        catch (FileNotFoundException e)
        {
            throw new CudaException("File '"+filename+"' not found", e);
        }

        int data[] = new int[values.size()];
        for (int i=0; i values = new ArrayList();
        try 
        {
            Scanner scanner = new Scanner(new File(filename));
            scanner.useDelimiter(Pattern.compile("\\s+"));
            while (scanner.hasNext()) 
            {
                try
                {
                    values.add(Byte.parseByte(scanner.next()));
                } 
                catch (InputMismatchException e)
                {
                    throw new CudaException(
                        "Could not read value from file '"+filename+"'", e);
                }
            }
            scanner.close();
        }
        catch (FileNotFoundException e)
        {
            throw new CudaException("File '"+filename+"' not found", e);
        }

        byte data[] = new byte[values.size()];
        for (int i=0; i