Examples of io.netty.buffer.ByteBuf.clear()

io.netty.buffer.ByteBuf.clear()
Sets the {@code readerIndex} and {@code writerIndex} of this buffer to{@code 0}. This method is identical to {@link #setIndex(int,int) setIndex(0, 0)}.
Please note that the behavior of this method is different from that of NIO buffer, which sets the {@code limit} tothe {@code capacity} of the buffer.

        assertArrayEquals("Three byte short written", new byte[] { -128, 0, 1}, buf.array());
        assertEquals("Three byte short written", 3, buf.readableBytes());


        buf.clear();
        buf.writeZero(3);
        buf.clear();
        buf.writeShort(-32768);
        buf.writeByte(1);
        val = ByteBufUtils.readVarShort(buf);
        assertEquals("Three byte short read correctly", 32768, val);

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        buf.writeShort(-32768);
        buf.writeByte(1);
        val = ByteBufUtils.readVarShort(buf);
        assertEquals("Three byte short read correctly", 32768, val);


        buf.clear();
        buf.writeZero(3);
        buf.clear();


        ByteBufUtils.writeVarShort(buf, 8388607);
        assertArrayEquals("Three byte short written", new byte[] { -1, -1, -1}, buf.array());

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        val = ByteBufUtils.readVarShort(buf);
        assertEquals("Three byte short read correctly", 32768, val);


        buf.clear();
        buf.writeZero(3);
        buf.clear();


        ByteBufUtils.writeVarShort(buf, 8388607);
        assertArrayEquals("Three byte short written", new byte[] { -1, -1, -1}, buf.array());
        assertEquals("Three byte short written", 3, buf.readableBytes());

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        ByteBufUtils.writeVarShort(buf, 8388607);
        assertArrayEquals("Three byte short written", new byte[] { -1, -1, -1}, buf.array());
        assertEquals("Three byte short written", 3, buf.readableBytes());


        buf.clear();
        buf.writeZero(3);
        buf.clear();
        buf.writeShort(-1);
        buf.writeByte(-1);
        val = ByteBufUtils.readVarShort(buf);

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        assertArrayEquals("Three byte short written", new byte[] { -1, -1, -1}, buf.array());
        assertEquals("Three byte short written", 3, buf.readableBytes());


        buf.clear();
        buf.writeZero(3);
        buf.clear();
        buf.writeShort(-1);
        buf.writeByte(-1);
        val = ByteBufUtils.readVarShort(buf);
        assertEquals("Three byte short read correctly", 8388607, val);
    }

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