/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.alipay.sofa.jraft.util;

import com.alipay.sofa.jraft.util.internal.UnsafeUtil;
import com.google.protobuf.ByteString;

/**
 * @author jiachun.fjc
 */
public final class AsciiStringUtil {

    public static byte[] unsafeEncode(final CharSequence in) {
        final int len = in.length();
        final byte[] out = new byte[len];
        for (int i = 0; i < len; i++) {
            out[i] = (byte) in.charAt(i);
        }
        return out;
    }

    public static String unsafeDecode(final byte[] in, final int offset, final int len) {
        final char[] out = new char[len];
        for (int i = 0; i < len; i++) {
            out[i] = (char) (in[i + offset] & 0xFF);
        }
        return UnsafeUtil.moveToString(out);
    }

    public static String unsafeDecode(final byte[] in) {
        return unsafeDecode(in, 0, in.length);
    }

    public static String unsafeDecode(final ByteString in) {
        final int len = in.size();
        final char[] out = new char[len];
        for (int i = 0; i < len; i++) {
            out[i] = (char) (in.byteAt(i) & 0xFF);
        }
        return UnsafeUtil.moveToString(out);
    }

    private AsciiStringUtil() {
    }
}
