Java Char Array to UTF charsToUtf(char[] src, int srcIndex, byte[] dst, int dstIndex, int len)

Description

Copy characters in source array to bytes in target array, converting them to Utf8 representation.

License

Apache License

Parameter

Parameter	Description
src	The array holding the characters to convert.
srcIndex	The start index from which characters are converted.
dst	The array holding the converted characters..
dstIndex	The start index from which converted bytes are written.
len	The maximum number of characters to convert.

Return

First index in `dst' past the last copied byte.

Declaration

public static int charsToUtf(char[] src, int srcIndex, byte[] dst, int dstIndex, int len) 

Method Source Code

//package com.java2s;
/*//from  w w  w .j  av  a  2  s  .c  o  m
 * Copyright 2013 Alexander Shabanov - http://alexshabanov.com.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Copy characters in source array to bytes in target array, converting them to Utf8 representation.
     * The target array must be large enough to hold the result.
     * @param src       The array holding the characters to convert.
     * @param srcIndex  The start index from which characters are converted.
     * @param dst       The array holding the converted characters..
     * @param dstIndex  The start index from which converted bytes are written.
     * @param len       The maximum number of characters to convert.
     * @return First index in `dst' past the last copied byte.
     */
    public static int charsToUtf(char[] src, int srcIndex, byte[] dst, int dstIndex, int len) {
        int j = dstIndex;
        int limit = srcIndex + len;
        for (int i = srcIndex; i < limit; i++) {
            char ch = src[i];
            if (1 <= ch && ch <= 0x7F) {
                dst[j++] = (byte) ch;
            } else if (ch <= 0x7FF) {
                dst[j++] = (byte) (0xC0 | (ch >> 6));
                dst[j++] = (byte) (0x80 | (ch & 0x3F));
            } else {
                dst[j++] = (byte) (0xE0 | (ch >> 12));
                dst[j++] = (byte) (0x80 | ((ch >> 6) & 0x3F));
                dst[j++] = (byte) (0x80 | (ch & 0x3F));
            }
        }
        return j;
    }
}