capnproto-java-rpc/runtime/src/main/java/org/capnproto/StructPointer.java

// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package org.capnproto;

import java.nio.ByteBuffer;

final class StructPointer{
    public static short dataSize(long ref) {
        // in words.
        return (short)(WirePointer.upper32Bits(ref) & 0xffff);
    }

    public static short ptrCount(long ref) {
        return (short)(WirePointer.upper32Bits(ref) >>> 16);
    }

    public static int wordSize(long ref) {
        return (int)dataSize(ref) + (int)ptrCount(ref);
    }

    public static void setFromStructSize(ByteBuffer buffer, int offset, StructSize size) {
        buffer.putShort(8 * offset + 4, size.data);
        buffer.putShort(8 * offset + 6, size.pointers);
    }

    public static void set(ByteBuffer buffer, int offset, short dataSize, short pointerCount) {
        buffer.putShort(8 * offset + 4, dataSize);
        buffer.putShort(8 * offset + 6, pointerCount);
    }
}