Java UTF from toUTFBody(String str)

Description

to UTF Body

License

Open Source License

Declaration

public static String toUTFBody(String str) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.IOException;

import java.io.UTFDataFormatException;

public class Main {
    public static String toUTFBody(String str) throws IOException {
        int strlen = str.length();
        int utflen = 0;
        int c, count = 0;

        /* use charAt instead of copying String to char array */
        for (int i = 0; i < strlen; i++) {
            c = str.charAt(i);// w  ww  .j a  v  a2  s. co m
            if ((c >= 0x0001) && (c <= 0x007F)) {
                utflen++;
            } else if (c > 0x07FF) {
                utflen += 3;
            } else {
                utflen += 2;
            }
        }

        if (utflen > 65535)
            throw new UTFDataFormatException("encoded string too long: " + utflen + " bytes");

        byte[] bytearr = new byte[utflen];

        // bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
        // bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);

        int i = 0;
        for (i = 0; i < strlen; i++) {
            c = str.charAt(i);
            if (!((c >= 0x0001) && (c <= 0x007F)))
                break;
            bytearr[count++] = (byte) c;
        }

        for (; i < strlen; i++) {
            c = str.charAt(i);
            if ((c >= 0x0001) && (c <= 0x007F)) {
                bytearr[count++] = (byte) c;

            } else if (c > 0x07FF) {
                bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
                bytearr[count++] = (byte) (0x80 | ((c >> 6) & 0x3F));
                bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
            } else {
                bytearr[count++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
                bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
            }
        }
        // out.write(bytearr, 0, utflen + 2);
        // return utflen + 2;
        return new String(bytearr, "UTF-8");
    }
}

Related

1. toUtf8Path(String path)
2. toUTF8String(byte[] b, int offset, int length)
3. toUtf8String(String source)
4. toUTF8String(String str)
5. toUTF_8(String s)
6. toUtfBytes(final String s)
7. toUtfString(char[] encoded)