Example usage for io.netty.buffer ByteBuf copy

Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf copy.

Prototype

public abstract ByteBuf copy(int index, int length);

Source Link

Document

Returns a copy of this buffer's sub-region.

Usage

From source file:ru.jts_dev.authserver.util.Encoder.java

License:Open Source License

public ByteBuf validateChecksum(ByteBuf buf) {
    if (buf.readableBytes() % 4 != 0 || buf.readableBytes() <= 4) {
        throw new IndexOutOfBoundsException("ByteBuf size must be multiply of 4 and more, that 4");
    }//from   ww w. j av a2  s  .  c  o  m

    long checksum = 0;
    long check;
    int i;

    for (i = 0; i < buf.readableBytes() - 4; i += 4) {
        check = buf.getInt(i);

        checksum ^= check;
    }

    check = buf.getInt(i);

    if (check != checksum) {
        throw new InvalidParameterException("Wrong checksum");
    }

    return buf.copy(0, buf.readableBytes() - 4);
}