package com.rockchip.alexa.jacky.utils;
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import android.util.Log;
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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.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class Md5Util {
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// public static String getFileMD5String(String filePath) {
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// String value = null;
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// FileInputStream in = null;
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// File file = new File(filePath);
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// if (!file.exists()) {
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// return null;
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// }
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// try {
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// in = new FileInputStream(file);
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// MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());
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// MessageDigest md5 = MessageDigest.getInstance("MD5");
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// md5.update(byteBuffer);
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// BigInteger bi = new BigInteger(1, md5.digest());
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// value = bi.toString(16);
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// } catch (Exception e) {
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// e.printStackTrace();
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// } finally {
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// if (null != in) {
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// try {
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// in.close();
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// } catch (IOException e) {
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// e.printStackTrace();
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// }
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// }
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// }
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// return value.toUpperCase();
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// }
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private static MessageDigest mMessageDigest;
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private static char mHexDigits[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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static {
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try {
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mMessageDigest = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException e) {
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}
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}
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public static byte[] getFileMD5String(String filePath){
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InputStream fis = null;
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try {
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fis = new FileInputStream(filePath);
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byte[] buf = new byte[1024];
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int numRead;
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while ((numRead = fis.read(buf)) != -1) {
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mMessageDigest.update(buf, 0, numRead);
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}
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}catch (IOException e){
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e.printStackTrace();
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}finally {
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try {
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fis.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return mMessageDigest.digest();
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}
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private static String bufferToHex(byte bytes[]) {
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return bufferToHex(bytes, 0, bytes.length);
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}
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private static String bufferToHex(byte bytes[], int m, int n) {
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StringBuffer stringbuffer = new StringBuffer(2 * n);
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int k = m + n;
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for (int l = m; l < k; l++) {
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appendHexPair(bytes[l], stringbuffer);
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}
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Log.d("System.out", "bufferToHex: " +stringbuffer.toString().length());
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return stringbuffer.toString();
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}
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private static void appendHexPair(byte bt, StringBuffer stringBuffer) {
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char c0 = mHexDigits[(bt & 0xf0) >> 4]; // 取字节中高 4 位的数字转换
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char c1 = mHexDigits[bt & 0xf]; // 取字节中低 4 位的数字转换
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stringBuffer.append(c0);
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stringBuffer.append(c1);
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}
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}
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