69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
package de.mc8051.arma3launcher.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* Created by gurkengewuerz.de on 27.03.2020.
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*/
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public class FileUtils {
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public static final Charset DEFAULT_CHARSET;
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private static final char[] DIGITS_LOWER;
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private static final char[] DIGITS_UPPER;
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public static String sha1Hex(File f) throws IOException, NoSuchAlgorithmException {
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return encodeHexString(sha1(f));
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}
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public static byte[] sha1(File file) throws IOException, NoSuchAlgorithmException {
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MessageDigest digest = MessageDigest.getInstance("SHA-1");
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InputStream fis = new FileInputStream(file);
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int n = 0;
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byte[] buffer = new byte[8192];
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while (n != -1) {
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n = fis.read(buffer);
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if (n > 0) {
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digest.update(buffer, 0, n);
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}
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}
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return digest.digest();
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}
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public static String encodeHexString(byte[] data) {
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return new String(encodeHex(data));
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}
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public static char[] encodeHex(byte[] data) {
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return encodeHex(data, true);
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}
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public static char[] encodeHex(byte[] data, boolean toLowerCase) {
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return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
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}
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protected static char[] encodeHex(byte[] data, char[] toDigits) {
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int l = data.length;
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char[] out = new char[l << 1];
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int i = 0;
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for(int var5 = 0; i < l; ++i) {
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out[var5++] = toDigits[(240 & data[i]) >>> 4];
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out[var5++] = toDigits[15 & data[i]];
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}
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return out;
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}
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static {
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DEFAULT_CHARSET = StandardCharsets.UTF_8;
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DIGITS_LOWER = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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DIGITS_UPPER = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
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}
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}
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