com.facebook.buck.cxx.LcUuidScrubber.java Source code

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Here is the source code for com.facebook.buck.cxx.LcUuidScrubber.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.cxx;

import com.facebook.buck.io.FileScrubber;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;

import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Arrays;

public class LcUuidScrubber implements FileScrubber {

    private static final byte[] ZERO_UUID = new byte[16];

    @Override
    public void scrubFile(FileChannel file) throws IOException, ScrubException {
        if (!Machos.isMacho(file)) {
            return;
        }

        long size = file.size();
        MappedByteBuffer map = file.map(FileChannel.MapMode.READ_WRITE, 0, size);

        try {
            Machos.setUuid(map, ZERO_UUID);
        } catch (Machos.MachoException e) {
            throw new ScrubException(e.getMessage());
        }
        map.rewind();

        Hasher hasher = Hashing.sha1().newHasher();
        while (map.hasRemaining()) {
            hasher.putByte(map.get());
        }

        map.rewind();
        try {
            Machos.setUuid(map, Arrays.copyOf(hasher.hash().asBytes(), 16));
        } catch (Machos.MachoException e) {
            throw new ScrubException(e.getMessage());
        }
    }

}