util.java

OSGI这是一个中间件,与UPNP齐名,是用于移植到嵌入式平台之上

/*
 * Oscar Bundle Repository Copyright (c) 2004, Richard S. Hall All rights
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. * Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. * Neither the name of the
 * ungoverned.org nor the names of its contributors may be used to endorse or
 * promote products derived from this software without specific prior written
 * permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Contact: Richard S. Hall ([e-mail]) Contributor(s): Erik Wistrand
 * ([e-mail])
 *  
 */
package org.ungoverned.osgi.bundle.bundlerepository;

import java.util.StringTokenizer;

import org.osgi.framework.Bundle;
import org.osgi.framework.Constants;

import java.io.*;

public class Util
{
    public static String getBundleName(Bundle bundle)
    {
        String name = (String) bundle.getHeaders().get(Constants.BUNDLE_NAME);
        return (name == null)
            ? "Bundle " + Long.toString(bundle.getBundleId())
            : name;
    }

    public static int compareVersion(int[] v1, int[] v2)
    {
        if (v1[0] > v2[0])
        {
            return 1;
        }
        else if (v1[0] < v2[0])
        {
            return -1;
        }
        else if (v1[1] > v2[1])
        {
            return 1;
        }
        else if (v1[1] < v2[1])
        {
            return -1;
        }
        else if (v1[2] > v2[2])
        {
            return 1;
        }
        else if (v1[2] < v2[2])
        {
            return -1;
        }
        return 0;
    }

    public static int[] parseVersionString(String s)
    {
        int[] version = new int[] { 0, 0, 0 };

        if (s != null)
        {
            StringTokenizer st = new StringTokenizer(s, ".");
            if (st.hasMoreTokens())
            {
                try
                {
                    version[0] = Integer.parseInt(st.nextToken());
                    if (st.hasMoreTokens())
                    {
                        version[1] = Integer.parseInt(st.nextToken());
                        if (st.hasMoreTokens())
                        {
                            version[2] = Integer.parseInt(st.nextToken());
                        }
                    }
                    return version;
                }
                catch (NumberFormatException ex)
                {
                    throw new IllegalArgumentException(
                        "Improper version number.");
                }
            }
        }

        return version;
    }

    private static final byte encTab[] = { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
        0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
        0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x61, 0x62, 0x63, 0x64,
        0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
        0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x30, 0x31,
        0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2b, 0x2f };

    private static final byte decTab[] = { -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1,
        -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1,
        -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
        18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29,
        30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
        48, 49, 50, 51, -1, -1, -1, -1, -1 };

    public static String base64Encode(String s) throws IOException
    {
        return encode(s.getBytes(), 0);
    }

    /**
     * Encode a raw byte array to a Base64 String.
     * 
     * @param in Byte array to encode.
     * @param len Length of Base64 lines. 0 means no line breaks.
    **/
    public static String encode(byte[] in, int len) throws IOException
    {
        ByteArrayOutputStream baos = null;
        ByteArrayInputStream bais = null;
        try
        {
            baos = new ByteArrayOutputStream();
            bais = new ByteArrayInputStream(in);
            encode(bais, baos, len);
            // ASCII byte array to String
            return (new String(baos.toByteArray()));
        }
        finally
        {
            if (baos != null)
            {
                baos.close();
            }
            if (bais != null)
            {
                bais.close();
            }
        }
    }

    public static void encode(InputStream in, OutputStream out, int len)
        throws IOException
    {

        // Check that length is a multiple of 4 bytes
        if (len % 4 != 0)
        {
            throw new IllegalArgumentException("Length must be a multiple of 4");
        }

        // Read input stream until end of file
        int bits = 0;
        int nbits = 0;
        int nbytes = 0;
        int b;

        while ((b = in.read()) != -1)
        {
            bits = (bits << 8) | b;
            nbits += 8;
            while (nbits >= 6)
            {
                nbits -= 6;
                out.write(encTab[0x3f & (bits >> nbits)]);
                nbytes++;
                // New line
                if (len != 0 && nbytes >= len)
                {
                    out.write(0x0d);
                    out.write(0x0a);
                    nbytes -= len;
                }
            }
        }

        switch (nbits)
        {
            case 2:
                out.write(encTab[0x3f & (bits << 4)]);
                out.write(0x3d); // 0x3d = '='
                out.write(0x3d);
                break;
            case 4:
                out.write(encTab[0x3f & (bits << 2)]);
                out.write(0x3d);
                break;
        }

        if (len != 0)
        {
            if (nbytes != 0)
            {
                out.write(0x0d);
                out.write(0x0a);
            }
            out.write(0x0d);
            out.write(0x0a);
        }
    }
}