Unicode to UTF - Java java.lang

Java examples for java.lang:String UTF

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Description

Unicode to UTF

Demo Code


//package com.java2s;

public class Main {
    private static final int MASKBITS = 0x3F;
    private static final int MASKBYTE = 0x80;
    private static final int MASK2BYTES = 0xC0;
    private static final int MASK3BYTES = 0xE0;

    public static byte[] UNICODE_TO_UTF8(byte[] b) {
        int i = 0;
        int j = 0;
        byte[] utf8Byte = new byte[b.length * 2];
        while (i < b.length) {
            byte[] bUTF = new byte[1];
            int nCode = (b[i] & 0xFF) | ((b[i + 1] & 0xFF) << 8);
            if (nCode < 0x80) {
                bUTF = new byte[1];
                bUTF[0] = (byte) nCode;
            }//from   w w  w . j  a  v  a  2  s  .  c  o m
            // 110xxxxx 10xxxxxx
            else if (nCode < 0x800) {
                bUTF = new byte[2];
                bUTF[0] = (byte) (MASK2BYTES | nCode >> 6);
                bUTF[1] = (byte) (MASKBYTE | nCode & MASKBITS);
            }
            // 1110xxxx 10xxxxxx 10xxxxxx
            else if (nCode < 0x10000) {
                bUTF = new byte[3];
                bUTF[0] = (byte) (MASK3BYTES | nCode >> 12);
                bUTF[1] = (byte) (MASKBYTE | nCode >> 6 & MASKBITS);
                bUTF[2] = (byte) (MASKBYTE | nCode & MASKBITS);
            }
            for (int k = 0; k < bUTF.length; k++) {
                utf8Byte[j++] = bUTF[k];
            }
            i += 2;
        }
        b = new byte[j];
        System.arraycopy(utf8Byte, 0, b, 0, j);
        return b;
    }
}

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