package com.eatle.utils;
import java.util.Arrays;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
/**
* @corpor ��˾����Ѷ�ſ�
* @author ���ߣ�̷����
* @explain ���壺Base64���롢������
* @version ���ڣ�2012-11-19 ����10:41:14
*/
public class Base64
{
private static final char[] CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();
private static final int[] INV = new int[256];
static
{
Arrays.fill(INV, -1);
for (int i = 0, iS = CHARS.length; i < iS; i++)
{
INV[CHARS[i]] = i;
}
INV['='] = 0;
}
/**
* Returns Base64 characters, a clone of used array.
*/
public static char[] getAlphabet()
{
return CHARS.clone();
}
// ---------------------------------------------------------------- char[]
public static char[] encodeToChar(String s)
{
try
{
return encodeToChar(s.getBytes("UTF-8"), false);
}
catch (UnsupportedEncodingException ignore)
{
return null;
}
}
public static char[] encodeToChar(byte[] arr)
{
return encodeToChar(arr, false);
}
/**
* Encodes a raw byte array into a BASE64 <code>char[]</code>.
*/
public static char[] encodeToChar(byte[] arr, boolean lineSeparator)
{
int len = arr != null ? arr.length : 0;
if (len == 0)
{
return new char[0];
}
int evenlen = (len / 3) * 3;
int cnt = ((len - 1) / 3 + 1) << 2;
int destLen = cnt + (lineSeparator ? (cnt - 1) / 76 << 1 : 0);
char[] dest = new char[destLen];
for (int s = 0, d = 0, cc = 0; s < evenlen;)
{
int i = (arr[s++] & 0xff) << 16 | (arr[s++] & 0xff) << 8
| (arr[s++] & 0xff);
dest[d++] = CHARS[(i >>> 18) & 0x3f];
dest[d++] = CHARS[(i >>> 12) & 0x3f];
dest[d++] = CHARS[(i >>> 6) & 0x3f];
dest[d++] = CHARS[i & 0x3f];
if (lineSeparator && (++cc == 19) && (d < (destLen - 2)))
{
dest[d++] = '\r';
dest[d++] = '\n';
cc = 0;
}
}
int left = len - evenlen; // 0 - 2.
if (left > 0)
{
int i = ((arr[evenlen] & 0xff) << 10)
| (left == 2 ? ((arr[len - 1] & 0xff) << 2) : 0);
dest[destLen - 4] = CHARS[i >> 12];
dest[destLen - 3] = CHARS[(i >>> 6) & 0x3f];
dest[destLen - 2] = left == 2 ? CHARS[i & 0x3f] : '=';
dest[destLen - 1] = '=';
}
return dest;
}
/**
* Decodes a BASE64 encoded char array.
*/
public byte[] decode(char[] arr)
{
int length = arr.length;
if (length == 0)
{
return new byte[0];
}
int sndx = 0, endx = length - 1;
int pad = arr[endx] == '=' ? (arr[endx - 1] == '=' ? 2 : 1) : 0;
int cnt = endx - sndx + 1;
int sepCnt = length > 76 ? (arr[76] == '\r' ? cnt / 78 : 0) << 1 : 0;
int len = ((cnt - sepCnt) * 6 >> 3) - pad;
byte[] dest = new byte[len];
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen;)
{
int i = INV[arr[sndx++]] << 18 | INV[arr[sndx++]] << 12
| INV[arr[sndx++]] << 6 | INV[arr[sndx++]];
dest[d++] = (byte) (i >> 16);
dest[d++] = (byte) (i >> 8);
dest[d++] = (byte) i;
if (sepCnt > 0 && ++cc == 19)
{
sndx += 2;
cc = 0;
}
}
if (d < len)
{
int i = 0;
for (int j = 0; sndx <= endx - pad; j++)
{
i |= INV[arr[sndx++]] << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8)
{
dest[d++] = (byte) (i >> r);
}
}
return dest;
}
// ---------------------------------------------------------------- byte
public static byte[] encodeToByte(String s)
{
try
{
return encodeToByte(s.getBytes("UTF-8"), false);
}
catch (UnsupportedEncodingException ignore)
{
return null;
}
}
public static byte[] encodeToByte(byte[] arr)
{
return encodeToByte(arr, false);
}
/**
* Encodes a raw byte array into a BASE64 <code>byte[]</code>.
*/
public static byte[] encodeToByte(byte[] arr, boolean lineSep)
{
int len = arr != null ? arr.length : 0;
if (len == 0)
{
return new byte[0];
}
int evenlen = (len / 3) * 3;
int cnt = ((len - 1) / 3 + 1) << 2;
int destlen = cnt + (lineSep ? (cnt - 1) / 76 << 1 : 0);
byte[] dest = new byte[destlen];
for (int s = 0, d = 0, cc = 0; s < evenlen;)
{
int i = (arr[s++] & 0xff) << 16 | (arr[s++] & 0xff) << 8
| (arr[s++] & 0xff);
dest[d++] = (byte) CHARS[(i >>> 18) & 0x3f];
dest[d++] = (byte) CHARS[(i >>> 12) & 0x3f];
dest[d++] = (byte) CHARS[(i >>> 6) & 0x3f];
dest[d++] = (byte) CHARS[i & 0x3f];
if (lineSep && ++cc == 19 && d < destlen - 2)
{
dest[d++] = '\r';
dest[d++] = '\n';
cc = 0;
}
}
int left = len - evenlen;
if (left > 0)
{
int i = ((arr[evenlen] & 0xff) << 10)
| (left == 2 ? ((arr[len - 1] & 0xff) << 2) : 0);
dest[destlen - 4] = (byte) CHARS[i >> 12];
dest[destlen - 3] = (byte) CHARS[(i >>> 6) & 0x3f];
dest[destlen - 2] = left == 2 ? (byte) CHARS[i & 0x3f] : (byte) '=';
dest[destlen - 1] = '=';
}
return dest;
}
/**
* Decodes a BASE64 encoded byte array.
*/
public static byte[] decode(byte[] arr)
{
int length = arr.length;
if (length == 0)
{
return new byte[0];
}
int sndx = 0, endx = length - 1;
int pad = arr[endx] == '=' ? (arr[endx - 1] == '=' ? 2 : 1) : 0;
int cnt = endx - sndx + 1;
int sepCnt = length > 76 ? (arr[76] == '\r' ? cnt / 78 : 0) << 1 : 0;
int len = ((cnt - sepCnt) * 6 >> 3) - pad;
byte[] dest = new byte[len];
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen;)
{
int i = INV[arr[sndx++]] << 18 | INV[arr[sndx++]] << 12
| INV[arr[sndx++]] << 6 | INV[arr[sndx++]];
dest[d++] = (byte) (i >> 16);
dest[d++] = (byte) (i >> 8);
dest[d++] = (byte) i;
if (sepCnt > 0 && ++cc == 19)
{
sndx += 2;
cc = 0;
}
}
if (d < len)
{
int i = 0;
for (int j = 0; sndx <= endx - pad; j++)
{
i |= INV[arr[sndx++]] << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8)
{
dest[d++] = (byte) (i >> r);
}
}
return dest;
}
// ---------------------------------------------------------------- string
public static String encodeToString(String s)
{
try
{
return new String(encodeToChar(s.getBytes("UTF-8"), false));
}
catch (UnsupportedEncodingException ignore)
{
return null;
}
}
public static String decodeToString(String s)
{
try
{
return new String(decode(s), "UTF-8");
}
catch (UnsupportedEncodingException ignore)
{
return null;
}
}
public static String encodeToString(byte[] arr)
{
return new String(encodeToChar(arr, false));
}
/**
* Encodes a raw byte array into a BASE64 <code>String</code>.
*/
public static String encodeToString(byte[] arr, boolean lineSep)
{
return new String(encodeToChar(arr, lineSep));
}
/**
* Decodes a BASE64 encoded string.
*/
public static byte[] decode(String s)
{
int length = s.length();
if (length == 0)
{
return new byte[0];
}
int sndx = 0, endx = length - 1;
int pad = s.charAt(endx) == '=' ? (s.charAt(endx - 1) == '=' ? 2 : 1)
: 0;
int cnt = endx - sndx + 1;
int sepCnt = length > 76 ? (s.charAt(76) == '\r' ? cnt / 78 : 0) << 1
: 0;
int len = ((cnt - sepCnt) * 6 >> 3) - pad;
byte[] dest = new byte[len];
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen;)
{
int i = INV[s.charAt(sndx++)] << 18 | INV[s.charAt(sndx++)] << 12
| INV[s.charAt(sndx++)] << 6 | INV[s.charAt(sndx++)];
dest[d++] = (byte) (i >> 16);
dest[d++] = (byte) (i >> 8);
dest[d++] = (byte) i;
if (sepCnt > 0 && ++cc == 19)
{
sndx += 2;
cc = 0;
}
}
if (d < len)
{
int i = 0;
for (int j = 0; sndx <= endx - pad; j++)
{
i |= INV[s.charAt(sndx++)] << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8)
{
dest[d++] = (byte) (i >> r);
}
}
return dest;
}
public static void main(String[] args) throws IOException
{
BufferedReader br = new BufferedReader(new FileReader("C:\\2.txt"));
BufferedWriter bw = new BufferedWriter(new FileWriter("C:\\1.txt"));
String s = "";
while((s = br.readLine()) != null)
{
bw.write(Base64.decodeToString(s));
bw.newLine();
}
}
}