/*
 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.compiler.hotspot.replacements;

import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayBaseOffset;

import org.graalvm.compiler.api.replacements.ClassSubstitution;
import org.graalvm.compiler.api.replacements.MethodSubstitution;
import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
import org.graalvm.compiler.graph.Node.NodeIntrinsic;
import org.graalvm.compiler.hotspot.nodes.ComputeObjectAddressNode;
import org.graalvm.compiler.nodes.extended.ForeignCallNode;
import org.graalvm.compiler.word.Word;
import org.graalvm.word.WordBase;
import org.graalvm.word.WordFactory;

import jdk.vm.ci.meta.JavaKind;

// JaCoCo Exclude

/**
 * Substitutions for java.util.zip.CRC32C.
 */
@ClassSubstitution(className = "java.util.zip.CRC32C", optional = true)
public class CRC32CSubstitutions {

    @MethodSubstitution
    static int updateBytes(int crc, byte[] b, int off, int end) {
        Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(b, arrayBaseOffset(JavaKind.Byte) + off));
        return updateBytesCRC32(UPDATE_BYTES_CRC32C, crc, bufAddr, end - off);
    }

    @MethodSubstitution
    static int updateDirectByteBuffer(int crc, long addr, int off, int end) {
        WordBase bufAddr = WordFactory.unsigned(addr).add(off);
        return updateBytesCRC32(UPDATE_BYTES_CRC32C, crc, bufAddr, end - off);
    }

    public static final ForeignCallDescriptor UPDATE_BYTES_CRC32C = new ForeignCallDescriptor("updateBytesCRC32C", int.class, int.class, WordBase.class, int.class);

    @NodeIntrinsic(ForeignCallNode.class)
    public static native int updateBytesCRC32(@ConstantNodeParameter ForeignCallDescriptor descriptor, int crc, WordBase buf, int length);
}