utf8util_ao.java

经过反编译和部分代码修改后的ultraimpro java源代码。可在netbean环境下成功编译。供学习和分析用。

// Decompiled by DJ v3.9.9.91 Copyright 2005 Atanas Neshkov  Date: 2006-5-1 19:31:40
// Home Page : http://members.fortunecity.com/neshkov/dj.html  - Check often for new version!
// Decompiler options: packimports(3) 


public final class Utf8Util_ao
{

    public Utf8Util_ao()
    {
    }

    public static final synchronized byte[] Encode(boolean flag, String s)
    {
        int i;
        if(s == null || (i = s.length()) <= 0)
            return null;
        int j = i * 3;
        if(flag && j > 800)
            j = 800;
        byte abyte0[] = new byte[j];
        int k = 0;
        int l = 0;
        do
        {
            if(l >= i)
                break;
            char c;
            if((c = s.charAt(l)) >= 0 && c <= '\177')
            {
                abyte0[k] = (byte)c;
                k++;
            } else
            if(c >= '\200' && c <= '\u07FF')
            {
                abyte0[k] = (byte)(c >> 6 | 0xc0);
                abyte0[k + 1] = (byte)(c & 0x3f | 0x80);
                k += 2;
            } else
            if(c >= '\u0800' && c <= '\uFFFF')
            {
                abyte0[k] = (byte)(c >> 12 | 0xe0);
                abyte0[k + 1] = (byte)(c >> 6 & 0x3f | 0x80);
                abyte0[k + 2] = (byte)(c & 0x3f | 0x80);
                k += 3;
            }
            if(k >= j)
                break;
            l++;
        } while(true);
        byte abyte1[] = new byte[k];
        System.arraycopy(abyte0, 0, abyte1, 0, k);
        return abyte1;
    }

    public static final int GetEncodingSize(String s)
    {
        int i;
        if(s == null || (i = s.length()) <= 0)
            return 0;
        int j = 0;
        int k = 0;
        do
        {
            if(k >= i)
                break;
            char c;
            if((c = s.charAt(k)) >= 0 && c <= '\177')
                j++;
            else
            if(c >= '\200' && c <= '\u07FF')
                j += 2;
            else
            if(c >= '\u0800' && c <= '\uFFFF')
                j += 3;
            if(j >= 800)
                break;
            k++;
        } while(true);
        return j;
    }

    public static final synchronized String Decode(byte abyte0[], int i, int j)
    {
        int k;
        if(abyte0 == null || (k = abyte0.length) <= 0)
            return null;
        if(i + j > k)
            return null;
        char ac[] = new char[k];
        int l = 0;
        int i1 = i;
        do
        {
            if(i1 >= i + j)
                break;
            if((abyte0[i1] & 0x80) == 0)
            {
                ac[l] = (char)abyte0[i1];
                l++;
                i1++;
            } else
            if((abyte0[i1] & 0xe0) == 192)
            {
                ac[l] = (char)((abyte0[i1] & 0x1f) << 6 | abyte0[i1 + 1] & 0x3f);
                l++;
                i1 += 2;
            } else
            if((abyte0[i1] & 0xe0) == 224)
            {
                ac[l] = (char)((abyte0[i1] & 0xf) << 12 | (abyte0[i1 + 1] & 0x3f) << 6 | abyte0[i1 + 2] & 0x3f);
                l++;
                i1 += 3;
            }
        } while(true);
        String s;
        return s = String.valueOf(ac, 0, l);
    }
}