mmsencodingutility.java

用Java写的彩信的程序。包括wsp／mime／mms几部分。

/* 
 * JVending - J2ME MMS Client
 *
 * Distributed under Apache style software license included with the source code.
 */

package org.jvending.messaging.util;

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

public class MmsEncodingUtility {

    public static byte[] encodeMultiOctetInteger(long x) {
	byte[] b = new byte[32];
	int i = 0;
      int j = 0;
      do {
            j = (int) (x % 128L);
            if(i != 0)
                b[i] = (byte) (j - 128);
            else 
                b[i] = (byte) j;
          x = x / 128L;
          if(x == 0L) break;
      } while(i++ < 32);

      byte[] c = new byte[i + 1];
      for(int k = 0; k < i + 1; k++) {
          c[k] = b[i - k];
      }
      return c;
    }

    public static byte[] encodeUintvarInteger(long x) {
	byte[] b = new byte[5];
	int i = 0;
      int j = 0;
      do {
            j = (int) (x % 128L);
            if(i != 0)
                b[i] = (byte) (j - 128);
            else 
                b[i] = (byte) j;
          x = x / 128L;
          if(x == 0L) break;
      } while(i++ < 5);

      byte[] c = new byte[i + 1];
      for(int k = 0; k < i + 1; k++) {
          c[k] = b[i - k];
      }
      return c;
    }



}