mmsdecodingutility.java

Messaging- MIDP的是一个彩信客户端

/*
 *  JVending - J2ME MMS Client
 *  Copyright (C) 2004  Shane Isbell
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


package org.jvending.messaging.impl.util;

import org.jvending.messaging.impl.io.PeekInputStream;

import java.io.IOException;

/**
 * @author Shane Isbell
 * @version 1.0.0a
 * @created 04/03/27
 */

public class MmsDecodingUtility {

    public static long readLongInteger(int[] b, int length) {
        int x = 0;
        long uIntVar = 0L;
        for (int i = 0; i < length; i++) {
            x = b[i + 1];
            uIntVar = uIntVar*128L;
            uIntVar = uIntVar + (long) (x & 0x7f);
        }
        return uIntVar;
    }


   public static Long readMultiOctetInteger(PeekInputStream dis, int length) throws IOException {
        int x = 0;
        long uIntVar = 0L;
        for (int i = 0; i < length; i++) {
            x = dis.readByte();
            uIntVar = uIntVar*128L + (long) (x);
        }
        return (new Long(uIntVar));
    }

    public static int[] readDataOctets(PeekInputStream dis, int length) throws IOException {
        int[] b = new int[length];
        b[0] = length;
        for (int i = 0; i < length; i++) {
            b[i] = dis.readUnsignedByte();
        }
        return b;
    }

    public static Long readUintvarInteger(PeekInputStream dis) throws IOException {
        int x =0;
        int i = 0;
        long uIntVar = 0L;
        while((i++ < 5)) {
            x = dis.readByte();
            uIntVar = uIntVar*128L + (long) (x & 0x7f);
            if((x & 0x80) == 0) break;//that was last one
        }
        return (new Long(uIntVar));
    }


    public static String readString(PeekInputStream dis) throws IOException {
        StringBuffer sb = new StringBuffer();
        int k = 0;
        while((k = dis.readByte()) != 0) {
            sb.append((char) k);
        }
        return sb.toString();
    }

    public static String readExtensionMedia(PeekInputStream dis, int first) throws IOException {
        return ((char) first + readString(dis));
    }


}