com.sangupta.clitools.checksum.MD2.java Source code

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Here is the source code for com.sangupta.clitools.checksum.MD2.java

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/**
 *
 * clitools - Simple command line tools
 * Copyright (c) 2014-2015, Sandeep Gupta
 * 
 * http://sangupta.com/projects/clitools
 * 
 * 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.sangupta.clitools.checksum;

import io.airlift.airline.Arguments;
import io.airlift.airline.Command;
import io.airlift.airline.Help;
import io.airlift.airline.HelpOption;
import io.airlift.airline.SingleCommand;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.inject.Inject;

import org.apache.commons.io.FileUtils;

import com.sangupta.clitools.core.AbstractMultiFileTool;
import com.sangupta.jerry.util.AssertUtils;
import com.sangupta.jerry.util.StringUtils;

@Command(name = "md2", description = "Compute the MD2 hash of given file/file pattern(s)")
public class MD2 extends AbstractMultiFileTool {

    @Inject
    private HelpOption helpOption;

    @Arguments(description = "File(s)/file pattern(s) to work upon")
    private List<String> arguments;

    public static void main(String[] args) {
        MD2 md2 = SingleCommand.singleCommand(MD2.class).parse(args);

        if (md2.helpOption.showHelpIfRequested()) {
            return;
        }

        if (AssertUtils.isEmpty(md2.arguments)) {
            Help.help(md2.helpOption.commandMetadata);
            return;
        }

        md2.execute(md2.arguments.toArray(StringUtils.EMPTY_STRING_LIST));
    }

    protected boolean processFile(File file) throws IOException {
        if (file.isDirectory()) {
            return true;
        }

        byte[] bytes = FileUtils.readFileToByteArray(file);
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance(getAlgorithmName());
            byte[] array = md.digest(bytes);
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < array.length; ++i) {
                sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
            }

            System.out.println(sb.toString() + " *" + file.getName());
        } catch (java.security.NoSuchAlgorithmException e) {
            // do nothing
            System.out.println("No " + getAlgorithmName() + " implementation available");
            return false;
        }

        return true;
    }

    protected String getAlgorithmName() {
        return "md2";
    }

}