net.fabricmc.loom.util.Checksum.java Source code

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Here is the source code for net.fabricmc.loom.util.Checksum.java

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/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016 FabricMC
 *
 * 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 net.fabricmc.loom.util;

import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.common.io.Files;

import java.io.File;
import java.io.IOException;

public class Checksum {
    public static boolean equals(File file, String checksum) {
        if (file == null) {
            return false;
        }
        try {
            HashCode hash = Files.hash(file, Hashing.sha1());
            StringBuilder builder = new StringBuilder();
            for (Byte hashBytes : hash.asBytes()) {
                builder.append(Integer.toString((hashBytes & 0xFF) + 0x100, 16).substring(1));
            }
            return builder.toString().equals(checksum);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
}