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Code Issues Releases Activity

Added FileHash utility class

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Cristian Maglie 2014-05-16 00:54:33 +02:00 committed by Federico Fissore
parent 0588790f5b
commit 38aefb2ab4
1 changed files with 75 additions and 0 deletions
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arduino-core/src/cc/arduino/utils/FileHash.java Normal file
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/*
* This file is part of Arduino.
*
* Copyright 2014 Arduino LLC (http://www.arduino.cc/)
*
* Arduino is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*/
package cc.arduino.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class FileHash {
/**
* Calculate a message digest of a file using the algorithm specified. The
* result is a string containing the algorithm name followed by ":" and by the
* resulting hash in hex.
*
* @param file
* @param algorithm
* For example "SHA-256"
* @return The algorithm followed by ":" and the hash, for example:<br />
* "SHA-256:ee6796513086080cca078cbb383f543c5e508b647a71c9d6f39b7bca41071883"
* @throws IOException
* @throws NoSuchAlgorithmException
*/
public static String hash(File file, String algorithm) throws IOException,
NoSuchAlgorithmException {
FileInputStream in = new FileInputStream(file);
try {
byte buff[] = new byte[10240];
MessageDigest digest = MessageDigest.getInstance(algorithm);
while (in.available() > 0) {
int read = in.read(buff);
digest.update(buff, 0, read);
}
byte[] hash = digest.digest();
String res = "";
for (byte b : hash) {
int c = b & 0xFF;
if (c < 0x10)
res += "0";
res += Integer.toHexString(c);
}
return algorithm + ":" + res;
} finally {
in.close();
}
}
}