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The Async Http Client (AHC) classes.

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/*
 *    Copyright (c) 2014-2024 AsyncHttpClient Project. All rights reserved.
 *
 *    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-2.0
 *
 *    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.
 */
package org.asynchttpclient.util;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;

public final class StringUtils {

    private StringUtils() {
        // Prevent outside initialization
    }

    public static ByteBuffer charSequence2ByteBuffer(CharSequence cs, Charset charset) {
        return charset.encode(CharBuffer.wrap(cs));
    }

    public static byte[] byteBuffer2ByteArray(ByteBuffer bb) {
        byte[] rawBase = new byte[bb.remaining()];
        bb.get(rawBase);
        return rawBase;
    }

    public static byte[] charSequence2Bytes(CharSequence sb, Charset charset) {
        ByteBuffer bb = charSequence2ByteBuffer(sb, charset);
        return byteBuffer2ByteArray(bb);
    }

    public static String toHexString(byte[] data) {
        StringBuilder buffer = StringBuilderPool.DEFAULT.stringBuilder();
        for (byte aData : data) {
            buffer.append(Integer.toHexString((aData & 0xf0) >>> 4));
            buffer.append(Integer.toHexString(aData & 0x0f));
        }
        return buffer.toString();
    }

    public static void appendBase16(StringBuilder buf, byte[] bytes) {
        int base = 16;
        for (byte b : bytes) {
            int bi = 0xff & b;
            int c = '0' + bi / base % base;
            if (c > '9') {
                c = 'a' + c - '0' - 10;
            }
            buf.append((char) c);
            c = '0' + bi % base;
            if (c > '9') {
                c = 'a' + c - '0' - 10;
            }
            buf.append((char) c);
        }
    }
}