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/*
* Copyright 2018 - 2021 Anton Tananaev (anton@traccar.org)
* Copyright 2018 Andrey Kunitsyn (andrey@traccar.org)
*
* 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.traccar.helper;
import java.nio.charset.StandardCharsets;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
public final class BufferUtil {
private BufferUtil() {
}
public static int indexOf(String needle, ByteBuf haystack) {
return indexOf(needle, haystack, haystack.readerIndex(), haystack.writerIndex());
}
public static int indexOf(String needle, ByteBuf haystack, int startIndex, int endIndex) {
ByteBuf wrappedNeedle = Unpooled.wrappedBuffer(needle.getBytes(StandardCharsets.US_ASCII));
try {
return indexOf(wrappedNeedle, haystack, startIndex, endIndex);
} finally {
wrappedNeedle.release();
}
}
public static int indexOf(ByteBuf needle, ByteBuf haystack, int startIndex, int endIndex) {
ByteBuf wrappedHaystack;
if (startIndex == haystack.readerIndex() && endIndex == haystack.writerIndex()) {
wrappedHaystack = haystack;
} else {
wrappedHaystack = Unpooled.wrappedBuffer(haystack);
wrappedHaystack.readerIndex(startIndex - haystack.readerIndex());
wrappedHaystack.writerIndex(endIndex - haystack.readerIndex());
}
int result = ByteBufUtil.indexOf(needle, wrappedHaystack);
return result < 0 ? result : haystack.readerIndex() + startIndex + result;
}
}
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