Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 Copyright 2011 Google 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.
 */

import java.io.BufferedInputStream;

import java.io.FileDescriptor;
import java.io.FileInputStream;

import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.util.Log;

public class Main {
    private static final String TAG = "Camli_Util";
    private static final String HEX = "0123456789abcdef";

    public static String getSha1(FileDescriptor fd) {
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("SHA-1");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        byte[] b = new byte[4096];
        FileInputStream fis = new FileInputStream(fd);
        InputStream is = new BufferedInputStream(fis, 4096);
        try {
            for (int n; (n = is.read(b)) != -1;) {
                md.update(b, 0, n);
            }
        } catch (IOException e) {
            Log.w(TAG, "IOException while computing SHA-1");
            return null;
        }
        byte[] sha1hash = new byte[40];
        sha1hash = md.digest();
        return getHex(sha1hash);
    }

    public static String getHex(byte[] raw) {
        if (raw == null) {
            return null;
        }
        final StringBuilder hex = new StringBuilder(2 * raw.length);
        for (final byte b : raw) {
            hex.append(HEX.charAt((b & 0xF0) >> 4)).append(HEX.charAt((b & 0x0F)));
        }
        return hex.toString();
    }
}