package org.yzh.protocol.commons;
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import io.netty.buffer.ByteBuf;
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public class JTUtils {
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/**
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* BCC校验(异或校验)
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*/
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public static byte bcc(ByteBuf byteBuf, int tailOffset) {
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byte cs = 0;
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int readerIndex = byteBuf.readerIndex();
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int writerIndex = byteBuf.writerIndex() + tailOffset;
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while (readerIndex < writerIndex)
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cs ^= byteBuf.getByte(readerIndex++);
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return cs;
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}
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public static int headerLength(int version, boolean isSubpackage) {
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if (version > 0)
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return isSubpackage ? 21 : 17;
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else
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return isSubpackage ? 16 : 12;
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}
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}
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