Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.util.Log;
import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;

public class Main {
    private static final String TAG = "WXUtil";
    private static final char HEX_DIGITS[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
            'e', 'f' };

    public static String getCRC32(File file) {
        CRC32 crc32 = new CRC32();
        CheckedInputStream checkedinputstream = null;
        String crc = null;
        try {
            checkedinputstream = new CheckedInputStream(new FileInputStream(file), crc32);
            byte[] buf = new byte[1024];
            while (checkedinputstream.read(buf) >= 0) {
            }
            crc = Long.toHexString(crc32.getValue()).toUpperCase();
        } catch (Exception e) {
            Log.w(TAG, e);
            Log.e("WxException", e.getMessage(), e);
        } finally {
            if (checkedinputstream != null) {
                try {
                    checkedinputstream.close();
                } catch (IOException e) {
                }
            }
        }
        return crc;
    }

    /**
     * @hide
     * @param b
     * @return
     */
    public static String toHexString(byte[] b) { // String to byte
        StringBuilder sb = new StringBuilder(b.length * 2);
        for (int i = 0; i < b.length; i++) {
            sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]);
            sb.append(HEX_DIGITS[b[i] & 0x0f]);
        }
        return sb.toString();
    }
}