一、前言
关于dbunit(2.4.8)开源包中的org.dbunit.util.Base64源码类,进行Base64算法方式对字符串、二进制、序列化Serializable类型进行加解密,具体参见源码说明。
二、源码说明
package org.dbunit.util;@b@@b@import java.io.ByteArrayInputStream;@b@import java.io.ByteArrayOutputStream;@b@import java.io.FileInputStream;@b@import java.io.FilterInputStream;@b@import java.io.FilterOutputStream;@b@import java.io.IOException;@b@import java.io.InputStream;@b@import java.io.ObjectInputStream;@b@import java.io.ObjectOutputStream;@b@import java.io.OutputStream;@b@import java.io.PrintStream;@b@import java.io.Serializable;@b@import org.slf4j.Logger;@b@import org.slf4j.LoggerFactory;@b@@b@public class Base64@b@{@b@ private static final Logger logger = LoggerFactory.getLogger(Base64.class);@b@ public static final boolean ENCODE = 1;@b@ public static final boolean DECODE = 0;@b@ private static final int MAX_LINE_LENGTH = 76;@b@ private static final byte EQUALS_SIGN = 61;@b@ private static final byte NEW_LINE = 10;@b@ private static final byte[] ALPHABET = { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 43, 47 };@b@ private static final byte[] DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, -5, -5, -9, -9, -5, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -5, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 62, -9, -9, -9, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -9, -9, -9, -1, -9, -9, -9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -9, -9, -9, -9, -9, -9, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -9, -9, -9, -9 };@b@ private static final byte BAD_ENCODING = -9;@b@ private static final byte WHITE_SPACE_ENC = -5;@b@ private static final byte EQUALS_SIGN_ENC = -1;@b@ static Class class$org$dbunit$util$Base64$InputStream;@b@ static Class class$org$dbunit$util$Base64$OutputStream;@b@@b@ public static void main(String[] args)@b@ {@b@ logger.debug("main(args=" + args + ") - start");@b@@b@ String s = "Hello, world";@b@ s = "abcd";@b@@b@ byte[] b = encodeString(s).getBytes();@b@ byte[] c = decode(b, 0, b.length);@b@@b@ System.out.println("\n\n" + s + ":" + new String(b) + ":" + new String(c));@b@ try@b@ {@b@ FileInputStream fis = new FileInputStream("c:\\abcd.txt");@b@ InputStream b64is = new InputStream(fis, false);@b@ int ib = 0;@b@ while ((ib = b64is.read()) > 0);@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("main()", e);@b@@b@ e.printStackTrace();@b@ }@b@ }@b@@b@ private static byte[] encode3to4(byte[] threeBytes)@b@ {@b@ logger.debug("encode3to4(threeBytes=" + threeBytes + ") - start");@b@@b@ return encode3to4(threeBytes, 3);@b@ }@b@@b@ private static byte[] encode3to4(byte[] threeBytes, int numSigBytes)@b@ {@b@ logger.debug("encode3to4(threeBytes=" + threeBytes + ", numSigBytes=" + numSigBytes + ") - start");@b@@b@ byte[] dest = new byte[4];@b@ encode3to4(threeBytes, 0, numSigBytes, dest, 0);@b@ return dest;@b@ }@b@@b@ private static byte[] encode3to4(byte[] source, int srcOffset, int numSigBytes, byte[] destination, int destOffset)@b@ {@b@ if (logger.isDebugEnabled()) {@b@ logger.debug("encode3to4(source=" + source + ", srcOffset=" + srcOffset + ", numSigBytes=" + numSigBytes + ", destination=" + destination + ", destOffset=" + destOffset + ") - start");@b@ }@b@@b@ int inBuff = ((numSigBytes > 0) ? source[srcOffset] << 24 >>> 8 : 0) | ((numSigBytes > 1) ? source[(srcOffset + 1)] << 24 >>> 16 : 0) | ((numSigBytes > 2) ? source[(srcOffset + 2)] << 24 >>> 24 : 0);@b@@b@ switch (numSigBytes)@b@ {@b@ case 3:@b@ destination[destOffset] = ALPHABET[(inBuff >>> 18)];@b@ destination[(destOffset + 1)] = ALPHABET[(inBuff >>> 12 & 0x3F)];@b@ destination[(destOffset + 2)] = ALPHABET[(inBuff >>> 6 & 0x3F)];@b@ destination[(destOffset + 3)] = ALPHABET[(inBuff & 0x3F)];@b@ return destination;@b@ case 2:@b@ destination[destOffset] = ALPHABET[(inBuff >>> 18)];@b@ destination[(destOffset + 1)] = ALPHABET[(inBuff >>> 12 & 0x3F)];@b@ destination[(destOffset + 2)] = ALPHABET[(inBuff >>> 6 & 0x3F)];@b@ destination[(destOffset + 3)] = 61;@b@ return destination;@b@ case 1:@b@ destination[destOffset] = ALPHABET[(inBuff >>> 18)];@b@ destination[(destOffset + 1)] = ALPHABET[(inBuff >>> 12 & 0x3F)];@b@ destination[(destOffset + 2)] = 61;@b@ destination[(destOffset + 3)] = 61;@b@ return destination;@b@ }@b@@b@ return destination;@b@ }@b@@b@ public static String encodeObject(Serializable serializableObject)@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("encodeObject(serializableObject=" + serializableObject + ") - start");@b@@b@ ByteArrayOutputStream baos = null;@b@ OutputStream b64os = null;@b@ ObjectOutputStream oos = null;@b@ try@b@ {@b@ baos = new ByteArrayOutputStream();@b@ b64os = new OutputStream(baos, true);@b@ oos = new ObjectOutputStream(b64os);@b@@b@ oos.writeObject(serializableObject);@b@ }@b@ catch (IOException e)@b@ {@b@ logger.error("encodeObject()", e);@b@@b@ e.printStackTrace();@b@ Object localObject1 = null;@b@@b@ return localObject1;@b@ }@b@ finally@b@ {@b@ try@b@ {@b@ oos.close();@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("encodeObject()", e);@b@ }@b@ try@b@ {@b@ b64os.close();@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("encodeObject()", e);@b@ }@b@ try@b@ {@b@ baos.close();@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("encodeObject()", e);@b@ }@b@ }@b@@b@ return new String(baos.toByteArray());@b@ }@b@@b@ public static String encodeBytes(byte[] source)@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("encodeBytes(source=" + source + ") - start");@b@@b@ return encodeBytes(source, 0, source.length);@b@ }@b@@b@ public static String encodeBytes(byte[] source, int off, int len)@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("encodeBytes(source=" + source + ", off=" + off + ", len=" + len + ") - start");@b@@b@ int len43 = len * 4 / 3;@b@ byte[] outBuff = new byte[len43 + ((len % 3 > 0) ? 4 : 0) + len43 / 76];@b@@b@ int d = 0;@b@ int e = 0;@b@ int len2 = len - 2;@b@ int lineLength = 0;@b@ while (d < len2)@b@ {@b@ encode3to4(source, d, 3, outBuff, e);@b@@b@ lineLength += 4;@b@ if (lineLength == 76)@b@ {@b@ outBuff[(e + 4)] = 10;@b@ ++e;@b@ lineLength = 0;@b@ }@b@ d += 3; e += 4;@b@ }@b@@b@ if (d < len)@b@ {@b@ encode3to4(source, d, len - d, outBuff, e);@b@ e += 4;@b@ }@b@@b@ return new String(outBuff, 0, e);@b@ }@b@@b@ public static String encodeString(String s)@b@ {@b@ logger.debug("encodeString(s={}) - start", s);@b@@b@ return encodeBytes(s.getBytes());@b@ }@b@@b@ private static byte[] decode4to3(byte[] fourBytes)@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("decode4to3(fourBytes=" + fourBytes + ") - start");@b@@b@ byte[] outBuff1 = new byte[3];@b@ int count = decode4to3(fourBytes, 0, outBuff1, 0);@b@ byte[] outBuff2 = new byte[count];@b@@b@ for (int i = 0; i < count; ++i)@b@ outBuff2[i] = outBuff1[i];@b@@b@ return outBuff2;@b@ }@b@@b@ private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset)@b@ {@b@ if (logger.isDebugEnabled()) {@b@ logger.debug("decode4to3(source=" + source + ", srcOffset=" + srcOffset + ", destination=" + destination + ", destOffset=" + destOffset + ") - start");@b@ }@b@@b@ if (source[(srcOffset + 2)] == 61)@b@ {@b@ outBuff = DECODABET[source[srcOffset]] << 24 >>> 6 | DECODABET[source[(srcOffset + 1)]] << 24 >>> 12;@b@@b@ destination[destOffset] = (byte)(outBuff >>> 16);@b@ return 1;@b@ }@b@@b@ if (source[(srcOffset + 3)] == 61)@b@ {@b@ outBuff = DECODABET[source[srcOffset]] << 24 >>> 6 | DECODABET[source[(srcOffset + 1)]] << 24 >>> 12 | DECODABET[source[(srcOffset + 2)]] << 24 >>> 18;@b@@b@ destination[destOffset] = (byte)(outBuff >>> 16);@b@ destination[(destOffset + 1)] = (byte)(outBuff >>> 8);@b@ return 2;@b@ }@b@@b@ int outBuff = DECODABET[source[srcOffset]] << 24 >>> 6 | DECODABET[source[(srcOffset + 1)]] << 24 >>> 12 | DECODABET[source[(srcOffset + 2)]] << 24 >>> 18 | DECODABET[source[(srcOffset + 3)]] << 24 >>> 24;@b@@b@ destination[destOffset] = (byte)(outBuff >> 16);@b@ destination[(destOffset + 1)] = (byte)(outBuff >> 8);@b@ destination[(destOffset + 2)] = (byte)outBuff;@b@ return 3;@b@ }@b@@b@ public static byte[] decode(String s)@b@ {@b@ logger.debug("decode(s={}) - start", s);@b@@b@ byte[] bytes = s.getBytes();@b@ return decode(bytes, 0, bytes.length);@b@ }@b@@b@ public static String decodeToString(String s)@b@ {@b@ logger.debug("decodeToString(s={}) - start", s);@b@@b@ return new String(decode(s));@b@ }@b@@b@ public static Object decodeToObject(String encodedObject)@b@ {@b@ logger.debug("decodeToObject(encodedObject={} - start", encodedObject);@b@@b@ byte[] objBytes = decode(encodedObject);@b@@b@ ByteArrayInputStream bais = null;@b@ ObjectInputStream ois = null;@b@ try@b@ {@b@ bais = new ByteArrayInputStream(objBytes);@b@ ois = new ObjectInputStream(bais);@b@@b@ Object localObject1 = ois.readObject();@b@@b@ return localObject1;@b@ }@b@ catch (IOException e)@b@ {@b@ logger.error("decodeToObject()", e);@b@@b@ e.printStackTrace();@b@ e = null;@b@@b@ return e;@b@ }@b@ catch (ClassNotFoundException e)@b@ {@b@ logger.error("decodeToObject()", e);@b@@b@ e.printStackTrace();@b@ e = null;@b@@b@ return e;@b@ }@b@ finally@b@ {@b@ try@b@ {@b@ bais.close();@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("decodeToObject()", e);@b@ }@b@ try@b@ {@b@ ois.close();@b@ }@b@ catch (Exception e)@b@ {@b@ logger.error("decodeToObject()", e);@b@ }@b@ }@b@ }@b@@b@ public static byte[] decode(byte[] source, int off, int len)@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("decode(source=" + source + ", off=" + off + ", len=" + len + ") - start");@b@@b@ int len34 = len * 3 / 4;@b@ byte[] outBuff = new byte[len34];@b@ int outBuffPosn = 0;@b@@b@ byte[] b4 = new byte[4];@b@ int b4Posn = 0;@b@ int i = 0;@b@ byte sbiCrop = 0;@b@ byte sbiDecode = 0;@b@ for (i = 0; i < len; ++i)@b@ {@b@ sbiCrop = (byte)(source[i] & 0x7F);@b@ sbiDecode = DECODABET[sbiCrop];@b@@b@ if (sbiDecode >= -5)@b@ {@b@ if (sbiDecode < -1)@b@ break label221;@b@ b4[(b4Posn++)] = sbiCrop;@b@ if (b4Posn <= 3)@b@ break label221;@b@ outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn);@b@ b4Posn = 0;@b@@b@ if (sbiCrop != 61) break label221;@b@ break;@b@ }@b@@b@ System.err.println("Bad Base64 input character at " + i + ": " + source[i] + "(decimal)");@b@ return null;@b@ }@b@@b@ label221: byte[] out = new byte[outBuffPosn];@b@ System.arraycopy(outBuff, 0, out, 0, outBuffPosn);@b@ return out;@b@ }@b@@b@ static byte[] access$000(byte[] x0, int x1, int x2, byte[] x3, int x4)@b@ {@b@ return encode3to4(x0, x1, x2, x3, x4); } @b@ static byte[] access$100() { return DECODABET; } @b@ static int access$200(byte[] x0, int x1, byte[] x2, int x3) { return decode4to3(x0, x1, x2, x3); } @b@ static byte[] access$300(byte[] x0, int x1) { return encode3to4(x0, x1); } @b@ static byte[] access$400(byte[] x0) { return decode4to3(x0);@b@ }@b@@b@ public static class OutputStream extends FilterOutputStream@b@ {@b@ private static final Logger logger = LoggerFactory.getLogger((Base64.class$org$dbunit$util$Base64$OutputStream == null) ? (Base64.class$org$dbunit$util$Base64$OutputStream = Base64.class$("org.dbunit.util.Base64$OutputStream")) : Base64.class$org$dbunit$util$Base64$OutputStream);@b@ private boolean encode;@b@ private int position;@b@ private byte[] buffer;@b@ private int bufferLength;@b@ private int lineLength;@b@@b@ public OutputStream(OutputStream out)@b@ {@b@ this(out, true);@b@ }@b@@b@ public OutputStream(OutputStream out, boolean encode)@b@ {@b@ super(out);@b@ this.encode = encode;@b@ this.bufferLength = ((encode) ? 3 : 4);@b@ this.buffer = new byte[this.bufferLength];@b@ this.position = 0;@b@ this.lineLength = 0;@b@ }@b@@b@ public void write(int theByte)@b@ throws IOException@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("write(theByte=" + theByte + ") - start");@b@@b@ this.buffer[(this.position++)] = (byte)theByte;@b@ if (this.position >= this.bufferLength)@b@ {@b@ if (this.encode)@b@ {@b@ this.out.write(Base64.access$300(this.buffer, this.bufferLength));@b@@b@ this.lineLength += 4;@b@ if (this.lineLength >= 76)@b@ {@b@ this.out.write(10);@b@ this.lineLength = 0;@b@ }@b@ }@b@ else {@b@ this.out.write(Base64.access$400(this.buffer));@b@ }@b@ this.position = 0;@b@ }@b@ }@b@@b@ public void write(byte[] theBytes, int off, int len)@b@ throws IOException@b@ {@b@ if (logger.isDebugEnabled())@b@ logger.debug("write(theBytes=" + theBytes + ", off=" + off + ", len=" + len + ") - start");@b@@b@ for (int i = 0; i < len; ++i)@b@ {@b@ write(theBytes[(off + i)]);@b@ }@b@ }@b@@b@ public void flush()@b@ throws IOException@b@ {@b@ logger.debug("flush() - start");@b@@b@ if (this.position > 0)@b@ {@b@ if (this.encode)@b@ {@b@ this.out.write(Base64.access$300(this.buffer, this.position));@b@ }@b@ else@b@ {@b@ throw new IOException("Base64 input not properly padded.");@b@ }@b@ }@b@@b@ super.flush();@b@ this.out.flush();@b@ }@b@@b@ public void close()@b@ throws IOException@b@ {@b@ logger.debug("close() - start");@b@@b@ flush();@b@@b@ super.close();@b@ this.out.close();@b@@b@ this.buffer = null;@b@ this.out = null;@b@ }@b@ }@b@@b@ public static class InputStream extends FilterInputStream@b@ {@b@ private static final Logger logger = LoggerFactory.getLogger((Base64.class$org$dbunit$util$Base64$InputStream == null) ? (Base64.class$org$dbunit$util$Base64$InputStream = Base64.class$("org.dbunit.util.Base64$InputStream")) : Base64.class$org$dbunit$util$Base64$InputStream);@b@ private boolean encode;@b@ private int position;@b@ private byte[] buffer;@b@ private int bufferLength;@b@ private int numSigBytes;@b@@b@ public InputStream(InputStream in)@b@ {@b@ this(in, false);@b@ }@b@@b@ public InputStream(InputStream in, boolean encode)@b@ {@b@ super(in);@b@ this.encode = encode;@b@ this.bufferLength = ((encode) ? 4 : 3);@b@ this.buffer = new byte[this.bufferLength];@b@ this.position = -1;@b@ }@b@@b@ public int read()@b@ throws IOException@b@ {@b@ logger.debug("read() - start");@b@@b@ if (this.position < 0)@b@ {@b@ int i;@b@ int b;@b@ if (this.encode)@b@ {@b@ byte[] b3 = new byte[3];@b@ this.numSigBytes = 0;@b@ for (i = 0; i < 3; ++i)@b@ {@b@ try@b@ {@b@ b = this.in.read();@b@@b@ if (b >= 0)@b@ {@b@ b3[i] = (byte)b;@b@ this.numSigBytes += 1;@b@ }@b@@b@ }@b@ catch (IOException e)@b@ {@b@ logger.error("read()", e);@b@@b@ if (i == 0)@b@ throw e;@b@ }@b@@b@ }@b@@b@ if (this.numSigBytes > 0)@b@ {@b@ Base64.access$000(b3, 0, this.numSigBytes, this.buffer, 0);@b@ this.position = 0;@b@ }@b@@b@ }@b@ else@b@ {@b@ byte[] b4 = new byte[4];@b@ i = 0;@b@ for (i = 0; i < 4; ++i)@b@ {@b@ b = 0;@b@ do@b@ {@b@ b = this.in.read();@b@ }@b@ while ((b >= 0) && (Base64.access$100()[(b & 0x7F)] < -5));@b@@b@ if (b < 0)@b@ break;@b@@b@ b4[i] = (byte)b;@b@ }@b@@b@ if (i == 4)@b@ {@b@ this.numSigBytes = Base64.access$200(b4, 0, this.buffer, 0);@b@ this.position = 0;@b@ }@b@@b@ }@b@@b@ }@b@@b@ if (this.position >= 0)@b@ {@b@ if (this.position >= this.numSigBytes)@b@ return -1;@b@@b@ int b = this.buffer[(this.position++)];@b@@b@ if (this.position >= this.bufferLength)@b@ this.position = -1;@b@@b@ return b;@b@ }@b@@b@ return -1;@b@ }@b@@b@ public int read(byte[] dest, int off, int len)@b@ throws IOException@b@ {@b@ if (logger.isDebugEnabled()) {@b@ logger.debug("read(dest=" + dest + ", off=" + off + ", len=" + len + ") - start");@b@ }@b@@b@ for (int i = 0; i < len; ++i)@b@ {@b@ int b = read();@b@@b@ if (b < 0)@b@ return -1;@b@@b@ dest[(off + i)] = (byte)b;@b@ }@b@ return i;@b@ }@b@ }@b@}