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 * Copyright  1999-2004 The Apache Software Foundation.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package com.sun.org.apache.xml.internal.security.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.SecurityPermission;

A collection of different, general-purpose methods for JAVA-specific things
Author:
Christian Geuer-Pollmann/**
 * A collection of different, general-purpose methods for JAVA-specific things
 * @author Christian Geuer-Pollmann
 */
public class JavaUtils {

    
logging logging facility /** {@link java.util.logging} logging facility */
    static java.util.logging.Logger log =
        java.util.logging.Logger.getLogger(JavaUtils.class.getName());

    private static final SecurityPermission REGISTER_PERMISSION =
        new SecurityPermission(
            "com.sun.org.apache.xml.internal.security.register");

    private JavaUtils() {
        // we don't allow instantiation
    }

    
Method getBytesFromFile
Params:
fileName – 
Throws:
FileNotFoundException – 
IOException – 
Returns:
the bytes readed from the file/**
     * Method getBytesFromFile
     *
     * @param fileName
     * @return the bytes readed from the file
     *
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static byte[] getBytesFromFile(String fileName)
        throws FileNotFoundException, IOException {

        byte refBytes[] = null;

        FileInputStream fisRef = new FileInputStream(fileName);
        try {
            UnsyncByteArrayOutputStream baos = new UnsyncByteArrayOutputStream();
            byte buf[] = new byte[1024];
            int len;

            while ((len = fisRef.read(buf)) > 0) {
                baos.write(buf, 0, len);
            }

            refBytes = baos.toByteArray();
        } finally {
            fisRef.close();
        }

        return refBytes;
    }

    
Method writeBytesToFilename
Params:
filename – 
bytes – /**
     * Method writeBytesToFilename
     *
     * @param filename
     * @param bytes
     */
    public static void writeBytesToFilename(String filename, byte[] bytes) {

        FileOutputStream fos = null;
        try {
            if (filename != null && bytes != null) {
                File f = new File(filename);

                fos = new FileOutputStream(f);

                fos.write(bytes);
                fos.close();
            } else {
                log.log(java.util.logging.Level.FINE, "writeBytesToFilename got null byte[] pointed");
            }
        } catch (IOException ex) {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException ioe) {}
            }
        }
    }

    
This method reads all bytes from the given InputStream till EOF and
returns them as a byte array.
Params:
inputStream – 
Throws:
FileNotFoundException – 
IOException – 
Returns:
the bytes readed from the stream/**
     * This method reads all bytes from the given InputStream till EOF and
     * returns them as a byte array.
     *
     * @param inputStream
     * @return the bytes readed from the stream
     *
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static byte[] getBytesFromStream(InputStream inputStream)
        throws IOException {

        byte refBytes[] = null;

        UnsyncByteArrayOutputStream baos = new UnsyncByteArrayOutputStream();
        byte buf[] = new byte[1024];
        int len;

        while ((len = inputStream.read(buf)) > 0) {
            baos.write(buf, 0, len);
        }

        refBytes = baos.toByteArray();
        return refBytes;
    }

    
Throws a SecurityException if a security manager is installed and the caller is not allowed to register an implementation of an algorithm, transform, or other security sensitive XML Signature function. 
Throws:
SecurityException – if a security manager is installed and the caller has not been granted the "com.sun.org.apache.xml.internal.security.register" SecurityPermission/**
     * Throws a {@code SecurityException} if a security manager is installed
     * and the caller is not allowed to register an implementation of an
     * algorithm, transform, or other security sensitive XML Signature function.
     *
     * @throws SecurityException if a security manager is installed and the
     *    caller has not been granted the
     *    {@literal "com.sun.org.apache.xml.internal.security.register"}
     *    {@code SecurityPermission}
     */
    public static void checkRegisterPermission() {
        SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
            sm.checkPermission(REGISTER_PERMISSION);
        }
    }
}