标题：在Android上通过客户端写博客软件开发实例

作者：肖凤斌 binsweet@gmail.com

关注Android很久了，年初买了G4，但一直没有机会尝试Android上的软件开发。

自己有一个私人围脖，www.rysoft.net 仅供自己一个人使用，每次发围脖都要在手机的浏览器上发送，费流量呀。后来考虑是不是简化一下围脖，使用wap2来开发，就节省流量了，看了很久，没有什么头绪，所以暂时用asp.net开发了。为了不用浏览器来登录发博，就做了一个Android的发送软件，来快捷发送围脖，基本背景就是这样，下面介绍过程：

网站端：有一个anb.aspx页面，可以通过传递参数来post博客信息，如果成功，返回一个OK。

手机端：一个输入框用来输入围脖内容，一个选择按钮，可用选择图片，然后就是一个发送按钮。

用到的知识：

1、通过httpclient.execute以post 的形式发送围脖内容；

2、在Android中选择图片；

3、在Android中对图片进行缩放；

4、因为是客户端软件，又是通过post传递围脖，那么图片围脖就是难点，我同事给的思路是把图片进行编码，变成字符串，然后再网站端再对该字符串编码，存储为图片，经过实践，成功；其中用到base64编码；

5、长时间耗时处理，显示progrebar；

6、Android中控件的布局。

首先说Android中控件的布局，Android布局通过main.xml来实现

<?xml version="1.0" encoding="utf-8"?><br /> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"<br /> android:layout_width="fill_parent"<br /> android:layout_height="fill_parent"><br /> <TextView<br /> android:layout_width="fill_parent"<br /> android:layout_height="wrap_content"<br /> android:text="请输入要说的话："<br /> android:id="@+id/label"<br /> /><br /> <EditText android:text="" android:id="@+id/editText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/label"/><!-- have an eye on ! --><br /> <TextView android:text="图片路径:" android:id="@+id/TViewPic" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/editText"></TextView><br /> <Button android:text="选择图片" android:id="@+id/BtnPic" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/editText" android:layout_alignParentRight="true" android:layout_marginLeft="10dip"></Button><br /> <Button android:text="发送消息" android:id="@+id/BtnSend" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/BtnPic" android:layout_alignParentRight="true" android:layout_marginLeft="10dip"></Button><br /> <TextView android:text="发布结果:" android:id="@+id/TViewResult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/BtnPic"></TextView><br /> </RelativeLayout>

显示结果如下：

选择图片相关代码：

Button btnPic =(Button)this.findViewById(R.id.BtnPic);<br /> btnPic.setOnClickListener(new Button.OnClickListener(){<br /> public void onClick(View v) {<br /> Intent intent = new Intent();<br /> intent.setType("image/*");<br /> intent.setAction(Intent.ACTION_GET_CONTENT);<br /> startActivityForResult(Intent.createChooser(intent, "选择图片"),1);<br /> }<br /> });<br /> public void onActivityResult(int requestCode, int resultCode, Intent data) {<br /> super.onActivityResult(requestCode, resultCode, data);<br /> if (data == null) {<br /> return;<br /> }<br /> mPicPath=getImagePath(data.getData());<br /> mTVString="图片路径:"+mPicPath;<br /> mTViewPic.setText(mTVString);<br /> }<br /> private String getImagePath(Uri data) {<br /> try<br /> {<br /> Uri uri = data;<br /> Cursor cursor = getContentResolver().query(uri, null, null, null, null);<br /> cursor.moveToFirst();<br /> return cursor.getString(1);<br /> }<br /> catch(Exception e)<br /> {<br /> return "";<br /> }<br /> }

图片缩放，并把图片编码为字符串代码：

private String GetPicString()<br /> {<br /> try<br /> {<br /> Bitmap bmp = BitmapFactory.decodeFile(mPicPath);<br /> int width = bmp.getWidth();<br /> if(width>545)<br /> {<br /> int height = bmp.getHeight();<br /> int newWidth = 545;<br /> int newHeight=height*newWidth/width;<br /> //计算缩放率，新尺寸除原始尺寸<br /> float scaleWidth = ((float) newWidth) / width;<br /> float scaleHeight = ((float) newHeight) / height;<br /> Matrix matrix = new Matrix();<br /> matrix.postScale(scaleWidth, scaleHeight);<br /> Bitmap resizedBitmap = Bitmap.createBitmap(bmp, 0, 0, width,<br /> height, matrix, true);<br /> bmp = resizedBitmap;<br /> resizedBitmap = null;<br /> }<br /> ByteArrayOutputStream baos = new ByteArrayOutputStream();<br /> bmp.compress(CompressFormat.JPEG, 75, baos);<br /> byte[] bytes = baos.toByteArray();<br /> return Base64.encodeBytes(bytes);<br /> }<br /> catch (Exception e)<br /> {<br /> return "";<br /> }<br /> }

数据post发送代码：

public void SendBlog()<br /> {<br /> progressDialog = ProgressDialog.show(NYNY.this, "NYNY", "数据发送中，请稍等...", true);<br /> new Thread(new Runnable(){<br /> @Override<br /> public void run() {<br /> try {<br /> mRusult="发送结果：";<br /> handler.post(mUpdateResults);<br /> HttpClient httpclient = new DefaultHttpClient();<br /> HttpPost httppost = new HttpPost("http://www.rysoft.net/anb.aspx");<br /> List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);<br /> nameValuePairs.add(new BasicNameValuePair("UID", "XXXXX"));<br /> nameValuePairs.add(new BasicNameValuePair("PWD", "XXXX"));<br /> nameValuePairs.add(new BasicNameValuePair("BC", mEditText.getText().toString()));<br /> nameValuePairs.add(new BasicNameValuePair("MB", "1"));<br /> if(mPicPath.length()>0)<br /> {<br /> nameValuePairs.add(new BasicNameValuePair("PIC", GetPicString()));<br /> }<br /> httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8));<br /> HttpResponse response;<br /> response=httpclient.execute(httppost);<br /> if(response.getStatusLine().getStatusCode()==200)<br /> {<br /> if(EntityUtils.toString(response.getEntity()).equals("OK"))<br /> {<br /> mRusult="发送结果：发布成功！";<br /> }<br /> else<br /> {<br /> mRusult="发送结果：发布失败！";<br /> }<br /> }<br /> }<br /> catch (Exception e)<br /> {<br /> mRusult="发送结果："+e.getMessage();<br /> }<br /> handler.post(mUpdateResults);<br /> progressDialog.dismiss();<br /> }<br /> }).start();<br /> }

完整代码如下：

package com.android.rysoft.nyny;<br /> import java.io.ByteArrayOutputStream;<br /> import java.util.ArrayList;<br /> import java.util.List;<br /> import org.apache.http.HttpResponse;<br /> import org.apache.http.NameValuePair;<br /> import org.apache.http.client.HttpClient;<br /> import org.apache.http.client.entity.UrlEncodedFormEntity;<br /> import org.apache.http.client.methods.HttpPost;<br /> import org.apache.http.impl.client.DefaultHttpClient;<br /> import org.apache.http.message.BasicNameValuePair;<br /> import org.apache.http.protocol.HTTP;<br /> import org.apache.http.util.EntityUtils;<br /> import android.app.Activity;<br /> import android.app.ProgressDialog;<br /> import android.content.Intent;<br /> import android.database.Cursor;<br /> import android.graphics.Bitmap;<br /> import android.graphics.BitmapFactory;<br /> import android.graphics.Matrix;<br /> import android.graphics.Bitmap.CompressFormat;<br /> import android.net.Uri;<br /> import android.os.Bundle;<br /> import android.os.Handler;<br /> import android.view.View;<br /> import android.widget.Button;<br /> import android.widget.EditText;<br /> import android.widget.TextView;<br /> public class NYNY extends Activity {<br /> private EditText mEditText;<br /> private TextView mTViewPic,mTViewResult;<br /> private String mETString,mTVString,mPicPath="",mRusult="";<br /> private ProgressDialog progressDialog = null;<br /> private Handler handler = new Handler();<br /> private Runnable mUpdateResults = new Runnable() {<br /> public void run() {<br /> mTViewResult.setText(mRusult);<br /> }<br /> };<br /> /** Called when the activity is first created. */<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.main);<br /> mEditText = (EditText)findViewById(R.id.editText);<br /> mTViewPic = (TextView)findViewById(R.id.TViewPic);<br /> mTViewResult = (TextView)findViewById(R.id.TViewResult);<br /> Button btnPic =(Button)this.findViewById(R.id.BtnPic);<br /> btnPic.setOnClickListener(new Button.OnClickListener(){<br /> public void onClick(View v) {<br /> Intent intent = new Intent();<br /> intent.setType("image/*");<br /> intent.setAction(Intent.ACTION_GET_CONTENT);<br /> startActivityForResult(Intent.createChooser(intent, "选择图片"),1);<br /> }<br /> });<br /> Button btnSend =(Button)this.findViewById(R.id.BtnSend);<br /> btnSend.setOnClickListener(new Button.OnClickListener(){<br /> public void onClick(View v) {<br /> SendBlog();<br /> }<br /> });<br /> }<br /> public void onActivityResult(int requestCode, int resultCode, Intent data) {<br /> super.onActivityResult(requestCode, resultCode, data);<br /> if (data == null) {<br /> return;<br /> }<br /> mPicPath=getImagePath(data.getData());<br /> mTVString="图片路径:"+mPicPath;<br /> mTViewPic.setText(mTVString);<br /> }<br /> private String getImagePath(Uri data) {<br /> try<br /> {<br /> Uri uri = data;<br /> Cursor cursor = getContentResolver().query(uri, null, null, null, null);<br /> cursor.moveToFirst();<br /> return cursor.getString(1);<br /> }<br /> catch(Exception e)<br /> {<br /> return "";<br /> }<br /> }<br /> public void SendBlog()<br /> {<br /> progressDialog = ProgressDialog.show(NYNY.this, "NYNY", "数据发送中，请稍等...", true);<br /> new Thread(new Runnable(){<br /> @Override<br /> public void run() {<br /> try {<br /> mRusult="发送结果：";<br /> handler.post(mUpdateResults);<br /> HttpClient httpclient = new DefaultHttpClient();<br /> HttpPost httppost = new HttpPost("http://www.rysoft.net/anb.aspx");<br /> List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);<br /> nameValuePairs.add(new BasicNameValuePair("UID", "XXXXXX"));<br /> nameValuePairs.add(new BasicNameValuePair("PWD", "XXXXXX"));<br /> nameValuePairs.add(new BasicNameValuePair("BC", mEditText.getText().toString()));<br /> nameValuePairs.add(new BasicNameValuePair("MB", "1"));<br /> if(mPicPath.length()>0)<br /> {<br /> nameValuePairs.add(new BasicNameValuePair("PIC", GetPicString()));<br /> }<br /> httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8));<br /> HttpResponse response;<br /> response=httpclient.execute(httppost);<br /> if(response.getStatusLine().getStatusCode()==200)<br /> {<br /> if(EntityUtils.toString(response.getEntity()).equals("OK"))<br /> {<br /> mRusult="发送结果：发布成功！";<br /> }<br /> else<br /> {<br /> mRusult="发送结果：发布失败！";<br /> }<br /> }<br /> }<br /> catch (Exception e)<br /> {<br /> mRusult="发送结果："+e.getMessage();<br /> }<br /> handler.post(mUpdateResults);<br /> progressDialog.dismiss();<br /> }<br /> }).start();<br /> }<br /> private String GetPicString()<br /> {<br /> try<br /> {<br /> Bitmap bmp = BitmapFactory.decodeFile(mPicPath);<br /> int width = bmp.getWidth();<br /> if(width>545)<br /> {<br /> int height = bmp.getHeight();<br /> int newWidth = 545;<br /> int newHeight=height*newWidth/width;<br /> //计算缩放率，新尺寸除原始尺寸<br /> float scaleWidth = ((float) newWidth) / width;<br /> float scaleHeight = ((float) newHeight) / height;<br /> Matrix matrix = new Matrix();<br /> matrix.postScale(scaleWidth, scaleHeight);<br /> Bitmap resizedBitmap = Bitmap.createBitmap(bmp, 0, 0, width,<br /> height, matrix, true);<br /> bmp = resizedBitmap;<br /> resizedBitmap = null;<br /> }<br /> ByteArrayOutputStream baos = new ByteArrayOutputStream();<br /> bmp.compress(CompressFormat.JPEG, 75, baos);<br /> byte[] bytes = baos.toByteArray();<br /> return Base64.encodeBytes(bytes);<br /> }<br /> catch (Exception e)<br /> {<br /> return "";<br /> }<br /> }<br /> //当我们按HOME键时，我在onPause方法里，将输入的值赋给mString<br /> @Override<br /> protected void onPause() {<br /> super.onPause();<br /> mETString = mEditText.getText().toString();<br /> mTVString = mTViewPic.getText().toString();<br /> mRusult = mTViewResult.getText().toString();<br /> }<br /> @Override<br /> protected void onRestart() {<br /> super.onRestart();<br /> mEditText.setText(mETString);<br /> mTViewPic.setText(mTVString);<br /> mTViewResult.setText(mRusult);<br /> }<br /> }

附上用到的base64编码：

package com.android.rysoft.nyny;<br /> /**<br /> * <p>Encodes and decodes to and from Base64 notation.</p><br /> * <p>Homepage: <a href="http://iharder.net/base64" mce_href="http://iharder.net/base64">http://iharder.net/base64</a>.</p><br /> *<br /> * <p>Example:</p><br /> *<br /> * <code>String encoded = Base64.encode( myByteArray );</code><br /> * <br /><br /> * <code>byte[] myByteArray = Base64.decode( encoded );</code><br /> *<br /> * <p>The <tt>options</tt> parameter, which appears in a few places, is used to pass<br /> * several pieces of information to the encoder. In the "higher level" methods such as<br /> * encodeBytes( bytes, options ) the options parameter can be used to indicate such<br /> * things as first gzipping the bytes before encoding them, not inserting linefeeds,<br /> * and encoding using the URL-safe and Ordered dialects.</p><br /> *<br /> * <p>Note, according to <a href="http://www.faqs.org/rfcs/rfc3548.html" mce_href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>,<br /> * Section 2.1, implementations should not add line feeds unless explicitly told<br /> * to do so. I've got Base64 set to this behavior now, although earlier versions<br /> * broke lines by default.</p><br /> *<br /> * <p>The constants defined in Base64 can be OR-ed together to combine options, so you<br /> * might make a call like this:</p><br /> *<br /> * <code>String encoded = Base64.encodeBytes( mybytes, Base64.GZIP | Base64.DO_BREAK_LINES );</code><br /> * <p>to compress the data before encoding it and then making the output have newline characters.</p><br /> * <p>Also...</p><br /> * <code>String encoded = Base64.encodeBytes( crazyString.getBytes() );</code><br /> *<br /> *<br /> *<br /> * <p><br /> * Change Log:<br /> * </p><br /> * <ul><br /> * <li>v2.3.7 - Fixed subtle bug when base 64 input stream contained the<br /> * value 01111111, which is an invalid base 64 character but should not<br /> * throw an ArrayIndexOutOfBoundsException either. Led to discovery of<br /> * mishandling (or potential for better handling) of other bad input<br /> * characters. You should now get an IOException if you try decoding<br /> * something that has bad characters in it.</li><br /> * <li>v2.3.6 - Fixed bug when breaking lines and the final byte of the encoded<br /> * string ended in the last column; the buffer was not properly shrunk and<br /> * contained an extra (null) byte that made it into the string.</li><br /> * <li>v2.3.5 - Fixed bug in {@link #encodeFromFile} where estimated buffer size<br /> * was wrong for files of size 31, 34, and 37 bytes.</li><br /> * <li>v2.3.4 - Fixed bug when working with gzipped streams whereby flushing<br /> * the Base64.OutputStream closed the Base64 encoding (by padding with equals<br /> * signs) too soon. Also added an option to suppress the automatic decoding<br /> * of gzipped streams. Also added experimental support for specifying a<br /> * class loader when using the<br /> * {@link #decodeToObject(java.lang.String, int, java.lang.ClassLoader)}<br /> * method.</li><br /> * <li>v2.3.3 - Changed default char encoding to US-ASCII which reduces the internal Java<br /> * footprint with its CharEncoders and so forth. Fixed some javadocs that were<br /> * inconsistent. Removed imports and specified things like java.io.IOException<br /> * explicitly inline.</li><br /> * <li>v2.3.2 - Reduced memory footprint! Finally refined the "guessing" of how big the<br /> * final encoded data will be so that the code doesn't have to create two output<br /> * arrays: an oversized initial one and then a final, exact-sized one. Big win<br /> * when using the {@link #encodeBytesToBytes(byte[])} family of methods (and not<br /> * using the gzip options which uses a different mechanism with streams and stuff).</li><br /> * <li>v2.3.1 - Added {@link #encodeBytesToBytes(byte[], int, int, int)} and some<br /> * similar helper methods to be more efficient with memory by not returning a<br /> * String but just a byte array.</li><br /> * <li>v2.3 - <strong>This is not a drop-in replacement!</strong> This is two years of comments<br /> * and bug fixes queued up and finally executed. Thanks to everyone who sent<br /> * me stuff, and I'm sorry I wasn't able to distribute your fixes to everyone else.<br /> * Much bad coding was cleaned up including throwing exceptions where necessary<br /> * instead of returning null values or something similar. Here are some changes<br /> * that may affect you:<br /> * <ul><br /> * <li><em>Does not break lines, by default.</em> This is to keep in compliance with<br /> * <a href="http://www.faqs.org/rfcs/rfc3548.html" mce_href="http://www.faqs.org/rfcs/rfc3548.html">RFC3548</a>.</li><br /> * <li><em>Throws exceptions instead of returning null values.</em> Because some operations<br /> * (especially those that may permit the GZIP option) use IO streams, there<br /> * is a possiblity of an java.io.IOException being thrown. After some discussion and<br /> * thought, I've changed the behavior of the methods to throw java.io.IOExceptions<br /> * rather than return null if ever there's an error. I think this is more<br /> * appropriate, though it will require some changes to your code. Sorry,<br /> * it should have been done this way to begin with.</li><br /> * <li><em>Removed all references to System.out, System.err, and the like.</em><br /> * Shame on me. All I can say is sorry they were ever there.</li><br /> * <li><em>Throws NullPointerExceptions and IllegalArgumentExceptions</em> as needed<br /> * such as when passed arrays are null or offsets are invalid.</li><br /> * <li>Cleaned up as much javadoc as I could to avoid any javadoc warnings.<br /> * This was especially annoying before for people who were thorough in their<br /> * own projects and then had gobs of javadoc warnings on this file.</li><br /> * </ul><br /> * <li>v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug<br /> * when using very small files (~< 40 bytes).</li><br /> * <li>v2.2 - Added some helper methods for encoding/decoding directly from<br /> * one file to the next. Also added a main() method to support command line<br /> * encoding/decoding from one file to the next. Also added these Base64 dialects:<br /> * <ol><br /> * <li>The default is RFC3548 format.</li><br /> * <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates<br /> * URL and file name friendly format as described in Section 4 of RFC3548.<br /> * http://www.faqs.org/rfcs/rfc3548.html</li><br /> * <li>Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates<br /> * URL and file name friendly format that preserves lexical ordering as described<br /> * in http://www.faqs.org/qa/rfcc-1940.html</li><br /> * </ol><br /> * Special thanks to Jim Kellerman at <a href="http://www.powerset.com/" mce_href="http://www.powerset.com/">http://www.powerset.com/</a><br /> * for contributing the new Base64 dialects.<br /> * </li><br /> *<br /> * <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added<br /> * some convenience methods for reading and writing to and from files.</li><br /> * <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems<br /> * with other encodings (like EBCDIC).</li><br /> * <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the<br /> * encoded data was a single byte.</li><br /> * <li>v2.0 - I got rid of methods that used booleans to set options.<br /> * Now everything is more consolidated and cleaner. The code now detects<br /> * when data that's being decoded is gzip-compressed and will decompress it<br /> * automatically. Generally things are cleaner. You'll probably have to<br /> * change some method calls that you were making to support the new<br /> * options format (<tt>int</tt>s that you "OR" together).</li><br /> * <li>v1.5.1 - Fixed bug when decompressing and decoding to a<br /> * byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.<br /> * Added the ability to "suspend" encoding in the Output Stream so<br /> * you can turn on and off the encoding if you need to embed base64<br /> * data in an otherwise "normal" stream (like an XML file).</li><br /> * <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.<br /> * This helps when using GZIP streams.<br /> * Added the ability to GZip-compress objects before encoding them.</li><br /> * <li>v1.4 - Added helper methods to read/write files.</li><br /> * <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li><br /> * <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream<br /> * where last buffer being read, if not completely full, was not returned.</li><br /> * <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li><br /> * <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li><br /> * </ul><br /> *<br /> * <p><br /> * I am placing this code in the Public Domain. Do with it as you will.<br /> * This software comes with no guarantees or warranties but with<br /> * plenty of well-wishing instead!<br /> * Please visit <a href="http://iharder.net/base64" mce_href="http://iharder.net/base64">http://iharder.net/base64</a><br /> * periodically to check for updates or to contribute improvements.<br /> * </p><br /> *<br /> * @author Robert Harder<br /> * @author rob@iharder.net<br /> * @version 2.3.7<br /> */<br /> public class Base64<br /> {<br /> /* ******** P U B L I C F I E L D S ******** */<br /> /** No options specified. Value is zero. */<br /> public final static int NO_OPTIONS = 0;<br /> /** Specify encoding in first bit. Value is one. */<br /> public final static int ENCODE = 1;<br /> /** Specify decoding in first bit. Value is zero. */<br /> public final static int DECODE = 0;<br /> /** Specify that data should be gzip-compressed in second bit. Value is two. */<br /> public final static int GZIP = 2;<br /> /** Specify that gzipped data should <em>not</em> be automatically gunzipped. */<br /> public final static int DONT_GUNZIP = 4;<br /> /** Do break lines when encoding. Value is 8. */<br /> public final static int DO_BREAK_LINES = 8;<br /> /**<br /> * Encode using Base64-like encoding that is URL- and Filename-safe as described<br /> * in Section 4 of RFC3548:<br /> * <a href="http://www.faqs.org/rfcs/rfc3548.html" mce_href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.<br /> * It is important to note that data encoded this way is <em>not</em> officially valid Base64,<br /> * or at the very least should not be called Base64 without also specifying that is<br /> * was encoded using the URL- and Filename-safe dialect.<br /> */<br /> public final static int URL_SAFE = 16;<br /> /**<br /> * Encode using the special "ordered" dialect of Base64 described here:<br /> * <a href="http://www.faqs.org/qa/rfcc-1940.html" mce_href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.<br /> */<br /> public final static int ORDERED = 32;<br /> /* ******** P R I V A T E F I E L D S ******** */<br /> /** Maximum line length (76) of Base64 output. */<br /> private final static int MAX_LINE_LENGTH = 76;<br /> /** The equals sign (=) as a byte. */<br /> private final static byte EQUALS_SIGN = (byte)'=';<br /> /** The new line character (/n) as a byte. */<br /> private final static byte NEW_LINE = (byte)'/n';<br /> /** Preferred encoding. */<br /> private final static String PREFERRED_ENCODING = "US-ASCII";<br /> private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding<br /> private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding<br /> /* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */<br /> /** The 64 valid Base64 values. */<br /> /* Host platform me be something funny like EBCDIC, so we hardcode these values. */<br /> private final static byte[] _STANDARD_ALPHABET = {<br /> (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',<br /> (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',<br /> (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',<br /> (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',<br /> (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',<br /> (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',<br /> (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',<br /> (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',<br /> (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',<br /> (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'<br /> };<br /> /**<br /> * Translates a Base64 value to either its 6-bit reconstruction value<br /> * or a negative number indicating some other meaning.<br /> **/<br /> private final static byte[] _STANDARD_DECODABET = {<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8<br /> -5,-5, // Whitespace: Tab and Linefeed<br /> -9,-9, // Decimal 11 - 12<br /> -5, // Whitespace: Carriage Return<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26<br /> -9,-9,-9,-9,-9, // Decimal 27 - 31<br /> -5, // Whitespace: Space<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42<br /> 62, // Plus sign at decimal 43<br /> -9,-9,-9, // Decimal 44 - 46<br /> 63, // Slash at decimal 47<br /> 52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine<br /> -9,-9,-9, // Decimal 58 - 60<br /> -1, // Equals sign at decimal 61<br /> -9,-9,-9, // Decimal 62 - 64<br /> 0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'<br /> 14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'<br /> -9,-9,-9,-9,-9,-9, // Decimal 91 - 96<br /> 26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'<br /> 39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'<br /> -9,-9,-9,-9,-9 // Decimal 123 - 127<br /> ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255<br /> };<br /> /* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */<br /> /**<br /> * Used in the URL- and Filename-safe dialect described in Section 4 of RFC3548:<br /> * <a href="http://www.faqs.org/rfcs/rfc3548.html" mce_href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.<br /> * Notice that the last two bytes become "hyphen" and "underscore" instead of "plus" and "slash."<br /> */<br /> private final static byte[] _URL_SAFE_ALPHABET = {<br /> (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',<br /> (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',<br /> (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',<br /> (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',<br /> (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',<br /> (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',<br /> (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',<br /> (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',<br /> (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',<br /> (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'-', (byte)'_'<br /> };<br /> /**<br /> * Used in decoding URL- and Filename-safe dialects of Base64.<br /> */<br /> private final static byte[] _URL_SAFE_DECODABET = {<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8<br /> -5,-5, // Whitespace: Tab and Linefeed<br /> -9,-9, // Decimal 11 - 12<br /> -5, // Whitespace: Carriage Return<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26<br /> -9,-9,-9,-9,-9, // Decimal 27 - 31<br /> -5, // Whitespace: Space<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42<br /> -9, // Plus sign at decimal 43<br /> -9, // Decimal 44<br /> 62, // Minus sign at decimal 45<br /> -9, // Decimal 46<br /> -9, // Slash at decimal 47<br /> 52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine<br /> -9,-9,-9, // Decimal 58 - 60<br /> -1, // Equals sign at decimal 61<br /> -9,-9,-9, // Decimal 62 - 64<br /> 0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'<br /> 14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'<br /> -9,-9,-9,-9, // Decimal 91 - 94<br /> 63, // Underscore at decimal 95<br /> -9, // Decimal 96<br /> 26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'<br /> 39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'<br /> -9,-9,-9,-9,-9 // Decimal 123 - 127<br /> ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255<br /> };<br /> /* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */<br /> /**<br /> * I don't get the point of this technique, but someone requested it,<br /> * and it is described here:<br /> * <a href="http://www.faqs.org/qa/rfcc-1940.html" mce_href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc-1940.html</a>.<br /> */<br /> private final static byte[] _ORDERED_ALPHABET = {<br /> (byte)'-',<br /> (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',<br /> (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9',<br /> (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',<br /> (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',<br /> (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',<br /> (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',<br /> (byte)'_',<br /> (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',<br /> (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',<br /> (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',<br /> (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z'<br /> };<br /> /**<br /> * Used in decoding the "ordered" dialect of Base64.<br /> */<br /> private final static byte[] _ORDERED_DECODABET = {<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8<br /> -5,-5, // Whitespace: Tab and Linefeed<br /> -9,-9, // Decimal 11 - 12<br /> -5, // Whitespace: Carriage Return<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26<br /> -9,-9,-9,-9,-9, // Decimal 27 - 31<br /> -5, // Whitespace: Space<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42<br /> -9, // Plus sign at decimal 43<br /> -9, // Decimal 44<br /> 0, // Minus sign at decimal 45<br /> -9, // Decimal 46<br /> -9, // Slash at decimal 47<br /> 1,2,3,4,5,6,7,8,9,10, // Numbers zero through nine<br /> -9,-9,-9, // Decimal 58 - 60<br /> -1, // Equals sign at decimal 61<br /> -9,-9,-9, // Decimal 62 - 64<br /> 11,12,13,14,15,16,17,18,19,20,21,22,23, // Letters 'A' through 'M'<br /> 24,25,26,27,28,29,30,31,32,33,34,35,36, // Letters 'N' through 'Z'<br /> -9,-9,-9,-9, // Decimal 91 - 94<br /> 37, // Underscore at decimal 95<br /> -9, // Decimal 96<br /> 38,39,40,41,42,43,44,45,46,47,48,49,50, // Letters 'a' through 'm'<br /> 51,52,53,54,55,56,57,58,59,60,61,62,63, // Letters 'n' through 'z'<br /> -9,-9,-9,-9,-9 // Decimal 123 - 127<br /> ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243<br /> -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255<br /> };<br /> /* ******** D E T E R M I N E W H I C H A L H A B E T ******** */<br /> /**<br /> * Returns one of the _SOMETHING_ALPHABET byte arrays depending on<br /> * the options specified.<br /> * It's possible, though silly, to specify ORDERED <b>and</b> URLSAFE<br /> * in which case one of them will be picked, though there is<br /> * no guarantee as to which one will be picked.<br /> */<br /> private final static byte[] getAlphabet( int options ) {<br /> if ((options & URL_SAFE) == URL_SAFE) {<br /> return _URL_SAFE_ALPHABET;<br /> } else if ((options & ORDERED) == ORDERED) {<br /> return _ORDERED_ALPHABET;<br /> } else {<br /> return _STANDARD_ALPHABET;<br /> }<br /> } // end getAlphabet<br /> /**<br /> * Returns one of the _SOMETHING_DECODABET byte arrays depending on<br /> * the options specified.<br /> * It's possible, though silly, to specify ORDERED and URL_SAFE<br /> * in which case one of them will be picked, though there is<br /> * no guarantee as to which one will be picked.<br /> */<br /> private final static byte[] getDecodabet( int options ) {<br /> if( (options & URL_SAFE) == URL_SAFE) {<br /> return _URL_SAFE_DECODABET;<br /> } else if ((options & ORDERED) == ORDERED) {<br /> return _ORDERED_DECODABET;<br /> } else {<br /> return _STANDARD_DECODABET;<br /> }<br /> } // end getAlphabet<br /> /** Defeats instantiation. */<br /> private Base64(){}<br /> /* ******** E N C O D I N G M E T H O D S ******** */<br /> /**<br /> * Encodes up to the first three bytes of array <var>threeBytes</var><br /> * and returns a four-byte array in Base64 notation.<br /> * The actual number of significant bytes in your array is<br /> * given by <var>numSigBytes</var>.<br /> * The array <var>threeBytes</var> needs only be as big as<br /> * <var>numSigBytes</var>.<br /> * Code can reuse a byte array by passing a four-byte array as <var>b4</var>.<br /> *<br /> * @param b4 A reusable byte array to reduce array instantiation<br /> * @param threeBytes the array to convert<br /> * @param numSigBytes the number of significant bytes in your array<br /> * @return four byte array in Base64 notation.<br /> * @since 1.5.1<br /> */<br /> private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes, int options ) {<br /> encode3to4( threeBytes, 0, numSigBytes, b4, 0, options );<br /> return b4;<br /> } // end encode3to4<br /> /**<br /> * <p>Encodes up to three bytes of the array <var>source</var><br /> * and writes the resulting four Base64 bytes to <var>destination</var>.<br /> * The source and destination arrays can be manipulated<br /> * anywhere along their length by specifying<br /> * <var>srcOffset</var> and <var>destOffset</var>.<br /> * This method does not check to make sure your arrays<br /> * are large enough to accomodate <var>srcOffset</var> + 3 for<br /> * the <var>source</var> array or <var>destOffset</var> + 4 for<br /> * the <var>destination</var> array.<br /> * The actual number of significant bytes in your array is<br /> * given by <var>numSigBytes</var>.</p><br /> * <p>This is the lowest level of the encoding methods with<br /> * all possible parameters.</p><br /> *<br /> * @param source the array to convert<br /> * @param srcOffset the index where conversion begins<br /> * @param numSigBytes the number of significant bytes in your array<br /> * @param destination the array to hold the conversion<br /> * @param destOffset the index where output will be put<br /> * @return the <var>destination</var> array<br /> * @since 1.3<br /> */<br /> private static byte[] encode3to4(<br /> byte[] source, int srcOffset, int numSigBytes,<br /> byte[] destination, int destOffset, int options ) {<br /> byte[] ALPHABET = getAlphabet( options );<br /> // 1 2 3<br /> // 01234567890123456789012345678901 Bit position<br /> // --------000000001111111122222222 Array position from threeBytes<br /> // --------| || || || | Six bit groups to index ALPHABET<br /> // >>18 >>12 >> 6 >> 0 Right shift necessary<br /> // 0x3f 0x3f 0x3f Additional AND<br /> // Create buffer with zero-padding if there are only one or two<br /> // significant bytes passed in the array.<br /> // We have to shift left 24 in order to flush out the 1's that appear<br /> // when Java treats a value as negative that is cast from a byte to an int.<br /> int inBuff = ( numSigBytes > 0 ? ((source[ srcOffset ] << 24) >>> 8) : 0 )<br /> | ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 )<br /> | ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 );<br /> switch( numSigBytes )<br /> {<br /> case 3:<br /> destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];<br /> destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];<br /> destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];<br /> destination[ destOffset + 3 ] = ALPHABET[ (inBuff ) & 0x3f ];<br /> return destination;<br /> case 2:<br /> destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];<br /> destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];<br /> destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];<br /> destination[ destOffset + 3 ] = EQUALS_SIGN;<br /> return destination;<br /> case 1:<br /> destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];<br /> destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];<br /> destination[ destOffset + 2 ] = EQUALS_SIGN;<br /> destination[ destOffset + 3 ] = EQUALS_SIGN;<br /> return destination;<br /> default:<br /> return destination;<br /> } // end switch<br /> } // end encode3to4<br /> /**<br /> * Performs Base64 encoding on the <code>raw</code> ByteBuffer,<br /> * writing it to the <code>encoded</code> ByteBuffer.<br /> * This is an experimental feature. Currently it does not<br /> * pass along any options (such as {@link #DO_BREAK_LINES}<br /> * or {@link #GZIP}.<br /> *<br /> * @param raw input buffer<br /> * @param encoded output buffer<br /> * @since 2.3<br /> */<br /> public static void encode( java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded ){<br /> byte[] raw3 = new byte[3];<br /> byte[] enc4 = new byte[4];<br /> while( raw.hasRemaining() ){<br /> int rem = Math.min(3,raw.remaining());<br /> raw.get(raw3,0,rem);<br /> Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );<br /> encoded.put(enc4);<br /> } // end input remaining<br /> }<br /> /**<br /> * Performs Base64 encoding on the <code>raw</code> ByteBuffer,<br /> * writing it to the <code>encoded</code> CharBuffer.<br /> * This is an experimental feature. Currently it does not<br /> * pass along any options (such as {@link #DO_BREAK_LINES}<br /> * or {@link #GZIP}.<br /> *<br /> * @param raw input buffer<br /> * @param encoded output buffer<br /> * @since 2.3<br /> */<br /> public static void encode( java.nio.ByteBuffer raw, java.nio.CharBuffer encoded ){<br /> byte[] raw3 = new byte[3];<br /> byte[] enc4 = new byte[4];<br /> while( raw.hasRemaining() ){<br /> int rem = Math.min(3,raw.remaining());<br /> raw.get(raw3,0,rem);<br /> Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );<br /> for( int i = 0; i < 4; i++ ){<br /> encoded.put( (char)(enc4[i] & 0xFF) );<br /> }<br /> } // end input remaining<br /> }<br /> /**<br /> * Serializes an object and returns the Base64-encoded<br /> * version of that serialized object.<br /> *<br /> * <p>As of v 2.3, if the object<br /> * cannot be serialized or there is another error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned a null value, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * The object is not GZip-compressed before being encoded.<br /> *<br /> * @param serializableObject The object to encode<br /> * @return The Base64-encoded object<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if serializedObject is null<br /> * @since 1.4<br /> */<br /> public static String encodeObject( java.io.Serializable serializableObject )<br /> throws java.io.IOException {<br /> return encodeObject( serializableObject, NO_OPTIONS );<br /> } // end encodeObject<br /> /**<br /> * Serializes an object and returns the Base64-encoded<br /> * version of that serialized object.<br /> *<br /> * <p>As of v 2.3, if the object<br /> * cannot be serialized or there is another error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned a null value, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * The object is not GZip-compressed before being encoded.<br /> * <p><br /> * Example options:<pre><br /> * GZIP: gzip-compresses object before encoding it.<br /> * DO_BREAK_LINES: break lines at 76 characters<br /> * </pre><br /> * <p><br /> * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or<br /> * <p><br /> * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )</code><br /> *<br /> * @param serializableObject The object to encode<br /> * @param options Specified options<br /> * @return The Base64-encoded object<br /> * @see Base64#GZIP<br /> * @see Base64#DO_BREAK_LINES<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.0<br /> */<br /> public static String encodeObject( java.io.Serializable serializableObject, int options )<br /> throws java.io.IOException {<br /> if( serializableObject == null ){<br /> throw new NullPointerException( "Cannot serialize a null object." );<br /> } // end if: null<br /> // Streams<br /> java.io.ByteArrayOutputStream baos = null;<br /> java.io.OutputStream b64os = null;<br /> java.util.zip.GZIPOutputStream gzos = null;<br /> java.io.ObjectOutputStream oos = null;<br /> try {<br /> // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream<br /> baos = new java.io.ByteArrayOutputStream();<br /> b64os = new Base64.OutputStream( baos, ENCODE | options );<br /> if( (options & GZIP) != 0 ){<br /> // Gzip<br /> gzos = new java.util.zip.GZIPOutputStream(b64os);<br /> oos = new java.io.ObjectOutputStream( gzos );<br /> } else {<br /> // Not gzipped<br /> oos = new java.io.ObjectOutputStream( b64os );<br /> }<br /> oos.writeObject( serializableObject );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> // Catch it and then throw it immediately so that<br /> // the finally{} block is called for cleanup.<br /> throw e;<br /> } // end catch<br /> finally {<br /> try{ oos.close(); } catch( Exception e ){}<br /> try{ gzos.close(); } catch( Exception e ){}<br /> try{ b64os.close(); } catch( Exception e ){}<br /> try{ baos.close(); } catch( Exception e ){}<br /> } // end finally<br /> // Return value according to relevant encoding.<br /> try {<br /> return new String( baos.toByteArray(), PREFERRED_ENCODING );<br /> } // end try<br /> catch (java.io.UnsupportedEncodingException uue){<br /> // Fall back to some Java default<br /> return new String( baos.toByteArray() );<br /> } // end catch<br /> } // end encode<br /> /**<br /> * Encodes a byte array into Base64 notation.<br /> * Does not GZip-compress data.<br /> *<br /> * @param source The data to convert<br /> * @return The data in Base64-encoded form<br /> * @throws NullPointerException if source array is null<br /> * @since 1.4<br /> */<br /> public static String encodeBytes( byte[] source ) {<br /> // Since we're not going to have the GZIP encoding turned on,<br /> // we're not going to have an java.io.IOException thrown, so<br /> // we should not force the user to have to catch it.<br /> String encoded = null;<br /> try {<br /> encoded = encodeBytes(source, 0, source.length, NO_OPTIONS);<br /> } catch (java.io.IOException ex) {<br /> assert false : ex.getMessage();<br /> } // end catch<br /> assert encoded != null;<br /> return encoded;<br /> } // end encodeBytes<br /> /**<br /> * Encodes a byte array into Base64 notation.<br /> * <p><br /> * Example options:<pre><br /> * GZIP: gzip-compresses object before encoding it.<br /> * DO_BREAK_LINES: break lines at 76 characters<br /> * <i>Note: Technically, this makes your encoding non-compliant.</i><br /> * </pre><br /> * <p><br /> * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or<br /> * <p><br /> * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code><br /> *<br /> *<br /> * <p>As of v 2.3, if there is an error with the GZIP stream,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned a null value, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> *<br /> * @param source The data to convert<br /> * @param options Specified options<br /> * @return The Base64-encoded data as a String<br /> * @see Base64#GZIP<br /> * @see Base64#DO_BREAK_LINES<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if source array is null<br /> * @since 2.0<br /> */<br /> public static String encodeBytes( byte[] source, int options ) throws java.io.IOException {<br /> return encodeBytes( source, 0, source.length, options );<br /> } // end encodeBytes<br /> /**<br /> * Encodes a byte array into Base64 notation.<br /> * Does not GZip-compress data.<br /> *<br /> * <p>As of v 2.3, if there is an error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned a null value, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> *<br /> * @param source The data to convert<br /> * @param off Offset in array where conversion should begin<br /> * @param len Length of data to convert<br /> * @return The Base64-encoded data as a String<br /> * @throws NullPointerException if source array is null<br /> * @throws IllegalArgumentException if source array, offset, or length are invalid<br /> * @since 1.4<br /> */<br /> public static String encodeBytes( byte[] source, int off, int len ) {<br /> // Since we're not going to have the GZIP encoding turned on,<br /> // we're not going to have an java.io.IOException thrown, so<br /> // we should not force the user to have to catch it.<br /> String encoded = null;<br /> try {<br /> encoded = encodeBytes( source, off, len, NO_OPTIONS );<br /> } catch (java.io.IOException ex) {<br /> assert false : ex.getMessage();<br /> } // end catch<br /> assert encoded != null;<br /> return encoded;<br /> } // end encodeBytes<br /> /**<br /> * Encodes a byte array into Base64 notation.<br /> * <p><br /> * Example options:<pre><br /> * GZIP: gzip-compresses object before encoding it.<br /> * DO_BREAK_LINES: break lines at 76 characters<br /> * <i>Note: Technically, this makes your encoding non-compliant.</i><br /> * </pre><br /> * <p><br /> * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or<br /> * <p><br /> * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code><br /> *<br /> *<br /> * <p>As of v 2.3, if there is an error with the GZIP stream,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned a null value, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> *<br /> * @param source The data to convert<br /> * @param off Offset in array where conversion should begin<br /> * @param len Length of data to convert<br /> * @param options Specified options<br /> * @return The Base64-encoded data as a String<br /> * @see Base64#GZIP<br /> * @see Base64#DO_BREAK_LINES<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if source array is null<br /> * @throws IllegalArgumentException if source array, offset, or length are invalid<br /> * @since 2.0<br /> */<br /> public static String encodeBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {<br /> byte[] encoded = encodeBytesToBytes( source, off, len, options );<br /> // Return value according to relevant encoding.<br /> try {<br /> return new String( encoded, PREFERRED_ENCODING );<br /> } // end try<br /> catch (java.io.UnsupportedEncodingException uue) {<br /> return new String( encoded );<br /> } // end catch<br /> } // end encodeBytes<br /> /**<br /> * Similar to {@link #encodeBytes(byte[])} but returns<br /> * a byte array instead of instantiating a String. This is more efficient<br /> * if you're working with I/O streams and have large data sets to encode.<br /> *<br /> *<br /> * @param source The data to convert<br /> * @return The Base64-encoded data as a byte[] (of ASCII characters)<br /> * @throws NullPointerException if source array is null<br /> * @since 2.3.1<br /> */<br /> public static byte[] encodeBytesToBytes( byte[] source ) {<br /> byte[] encoded = null;<br /> try {<br /> encoded = encodeBytesToBytes( source, 0, source.length, Base64.NO_OPTIONS );<br /> } catch( java.io.IOException ex ) {<br /> assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();<br /> }<br /> return encoded;<br /> }<br /> /**<br /> * Similar to {@link #encodeBytes(byte[], int, int, int)} but returns<br /> * a byte array instead of instantiating a String. This is more efficient<br /> * if you're working with I/O streams and have large data sets to encode.<br /> *<br /> *<br /> * @param source The data to convert<br /> * @param off Offset in array where conversion should begin<br /> * @param len Length of data to convert<br /> * @param options Specified options<br /> * @return The Base64-encoded data as a String<br /> * @see Base64#GZIP<br /> * @see Base64#DO_BREAK_LINES<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if source array is null<br /> * @throws IllegalArgumentException if source array, offset, or length are invalid<br /> * @since 2.3.1<br /> */<br /> public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {<br /> if( source == null ){<br /> throw new NullPointerException( "Cannot serialize a null array." );<br /> } // end if: null<br /> if( off < 0 ){<br /> throw new IllegalArgumentException( "Cannot have negative offset: " + off );<br /> } // end if: off < 0<br /> if( len < 0 ){<br /> throw new IllegalArgumentException( "Cannot have length offset: " + len );<br /> } // end if: len < 0<br /> if( off + len > source.length ){<br /> throw new IllegalArgumentException(<br /> String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));<br /> } // end if: off < 0<br /> // Compress?<br /> if( (options & GZIP) != 0 ) {<br /> java.io.ByteArrayOutputStream baos = null;<br /> java.util.zip.GZIPOutputStream gzos = null;<br /> Base64.OutputStream b64os = null;<br /> try {<br /> // GZip -> Base64 -> ByteArray<br /> baos = new java.io.ByteArrayOutputStream();<br /> b64os = new Base64.OutputStream( baos, ENCODE | options );<br /> gzos = new java.util.zip.GZIPOutputStream( b64os );<br /> gzos.write( source, off, len );<br /> gzos.close();<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> // Catch it and then throw it immediately so that<br /> // the finally{} block is called for cleanup.<br /> throw e;<br /> } // end catch<br /> finally {<br /> try{ gzos.close(); } catch( Exception e ){}<br /> try{ b64os.close(); } catch( Exception e ){}<br /> try{ baos.close(); } catch( Exception e ){}<br /> } // end finally<br /> return baos.toByteArray();<br /> } // end if: compress<br /> // Else, don't compress. Better not to use streams at all then.<br /> else {<br /> boolean breakLines = (options & DO_BREAK_LINES) != 0;<br /> //int len43 = len * 4 / 3;<br /> //byte[] outBuff = new byte[ ( len43 ) // Main 4:3<br /> // + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding<br /> // + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines<br /> // Try to determine more precisely how big the array needs to be.<br /> // If we get it right, we don't have to do an array copy, and<br /> // we save a bunch of memory.<br /> int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encoding<br /> if( breakLines ){<br /> encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters<br /> }<br /> byte[] outBuff = new byte[ encLen ];<br /> int d = 0;<br /> int e = 0;<br /> int len2 = len - 2;<br /> int lineLength = 0;<br /> for( ; d < len2; d+=3, e+=4 ) {<br /> encode3to4( source, d+off, 3, outBuff, e, options );<br /> lineLength += 4;<br /> if( breakLines && lineLength >= MAX_LINE_LENGTH )<br /> {<br /> outBuff[e+4] = NEW_LINE;<br /> e++;<br /> lineLength = 0;<br /> } // end if: end of line<br /> } // en dfor: each piece of array<br /> if( d < len ) {<br /> encode3to4( source, d+off, len - d, outBuff, e, options );<br /> e += 4;<br /> } // end if: some padding needed<br /> // Only resize array if we didn't guess it right.<br /> if( e <= outBuff.length - 1 ){<br /> // If breaking lines and the last byte falls right at<br /> // the line length (76 bytes per line), there will be<br /> // one extra byte, and the array will need to be resized.<br /> // Not too bad of an estimate on array size, I'd say.<br /> byte[] finalOut = new byte[e];<br /> System.arraycopy(outBuff,0, finalOut,0,e);<br /> //System.err.println("Having to resize array from " + outBuff.length + " to " + e );<br /> return finalOut;<br /> } else {<br /> //System.err.println("No need to resize array.");<br /> return outBuff;<br /> }<br /> } // end else: don't compress<br /> } // end encodeBytesToBytes<br /> /* ******** D E C O D I N G M E T H O D S ******** */<br /> /**<br /> * Decodes four bytes from array <var>source</var><br /> * and writes the resulting bytes (up to three of them)<br /> * to <var>destination</var>.<br /> * The source and destination arrays can be manipulated<br /> * anywhere along their length by specifying<br /> * <var>srcOffset</var> and <var>destOffset</var>.<br /> * This method does not check to make sure your arrays<br /> * are large enough to accomodate <var>srcOffset</var> + 4 for<br /> * the <var>source</var> array or <var>destOffset</var> + 3 for<br /> * the <var>destination</var> array.<br /> * This method returns the actual number of bytes that<br /> * were converted from the Base64 encoding.<br /> * <p>This is the lowest level of the decoding methods with<br /> * all possible parameters.</p><br /> *<br /> *<br /> * @param source the array to convert<br /> * @param srcOffset the index where conversion begins<br /> * @param destination the array to hold the conversion<br /> * @param destOffset the index where output will be put<br /> * @param options alphabet type is pulled from this (standard, url-safe, ordered)<br /> * @return the number of decoded bytes converted<br /> * @throws NullPointerException if source or destination arrays are null<br /> * @throws IllegalArgumentException if srcOffset or destOffset are invalid<br /> * or there is not enough room in the array.<br /> * @since 1.3<br /> */<br /> private static int decode4to3(<br /> byte[] source, int srcOffset,<br /> byte[] destination, int destOffset, int options ) {<br /> // Lots of error checking and exception throwing<br /> if( source == null ){<br /> throw new NullPointerException( "Source array was null." );<br /> } // end if<br /> if( destination == null ){<br /> throw new NullPointerException( "Destination array was null." );<br /> } // end if<br /> if( srcOffset < 0 || srcOffset + 3 >= source.length ){<br /> throw new IllegalArgumentException( String.format(<br /> "Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset ) );<br /> } // end if<br /> if( destOffset < 0 || destOffset +2 >= destination.length ){<br /> throw new IllegalArgumentException( String.format(<br /> "Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset ) );<br /> } // end if<br /> byte[] DECODABET = getDecodabet( options );<br /> // Example: Dk==<br /> if( source[ srcOffset + 2] == EQUALS_SIGN ) {<br /> // Two ways to do the same thing. Don't know which way I like best.<br /> //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )<br /> // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );<br /> int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )<br /> | ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 );<br /> destination[ destOffset ] = (byte)( outBuff >>> 16 );<br /> return 1;<br /> }<br /> // Example: DkL=<br /> else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) {<br /> // Two ways to do the same thing. Don't know which way I like best.<br /> //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )<br /> // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )<br /> // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );<br /> int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )<br /> | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )<br /> | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6 );<br /> destination[ destOffset ] = (byte)( outBuff >>> 16 );<br /> destination[ destOffset + 1 ] = (byte)( outBuff >>> 8 );<br /> return 2;<br /> }<br /> // Example: DkLE<br /> else {<br /> // Two ways to do the same thing. Don't know which way I like best.<br /> //int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )<br /> // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )<br /> // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )<br /> // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );<br /> int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )<br /> | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )<br /> | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6)<br /> | ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF ) );<br /> destination[ destOffset ] = (byte)( outBuff >> 16 );<br /> destination[ destOffset + 1 ] = (byte)( outBuff >> 8 );<br /> destination[ destOffset + 2 ] = (byte)( outBuff );<br /> return 3;<br /> }<br /> } // end decodeToBytes<br /> /**<br /> * Low-level access to decoding ASCII characters in<br /> * the form of a byte array. <strong>Ignores GUNZIP option, if<br /> * it's set.</strong> This is not generally a recommended method,<br /> * although it is used internally as part of the decoding process.<br /> * Special case: if len = 0, an empty array is returned. Still,<br /> * if you need more speed and reduced memory footprint (and aren't<br /> * gzipping), consider this method.<br /> *<br /> * @param source The Base64 encoded data<br /> * @return decoded data<br /> * @since 2.3.1<br /> */<br /> public static byte[] decode( byte[] source )<br /> throws java.io.IOException {<br /> byte[] decoded = null;<br /> // try {<br /> decoded = decode( source, 0, source.length, Base64.NO_OPTIONS );<br /> // } catch( java.io.IOException ex ) {<br /> // assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();<br /> // }<br /> return decoded;<br /> }<br /> /**<br /> * Low-level access to decoding ASCII characters in<br /> * the form of a byte array. <strong>Ignores GUNZIP option, if<br /> * it's set.</strong> This is not generally a recommended method,<br /> * although it is used internally as part of the decoding process.<br /> * Special case: if len = 0, an empty array is returned. Still,<br /> * if you need more speed and reduced memory footprint (and aren't<br /> * gzipping), consider this method.<br /> *<br /> * @param source The Base64 encoded data<br /> * @param off The offset of where to begin decoding<br /> * @param len The length of characters to decode<br /> * @param options Can specify options such as alphabet type to use<br /> * @return decoded data<br /> * @throws java.io.IOException If bogus characters exist in source data<br /> * @since 1.3<br /> */<br /> public static byte[] decode( byte[] source, int off, int len, int options )<br /> throws java.io.IOException {<br /> // Lots of error checking and exception throwing<br /> if( source == null ){<br /> throw new NullPointerException( "Cannot decode null source array." );<br /> } // end if<br /> if( off < 0 || off + len > source.length ){<br /> throw new IllegalArgumentException( String.format(<br /> "Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len ) );<br /> } // end if<br /> if( len == 0 ){<br /> return new byte[0];<br /> }else if( len < 4 ){<br /> throw new IllegalArgumentException(<br /> "Base64-encoded string must have at least four characters, but length specified was " + len );<br /> } // end if<br /> byte[] DECODABET = getDecodabet( options );<br /> int len34 = len * 3 / 4; // Estimate on array size<br /> byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output<br /> int outBuffPosn = 0; // Keep track of where we're writing<br /> byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating white space<br /> int b4Posn = 0; // Keep track of four byte input buffer<br /> int i = 0; // Source array counter<br /> byte sbiDecode = 0; // Special value from DECODABET<br /> for( i = off; i < off+len; i++ ) { // Loop through source<br /> sbiDecode = DECODABET[ source[i]&0xFF ];<br /> // White space, Equals sign, or legit Base64 character<br /> // Note the values such as -5 and -9 in the<br /> // DECODABETs at the top of the file.<br /> if( sbiDecode >= WHITE_SPACE_ENC ) {<br /> if( sbiDecode >= EQUALS_SIGN_ENC ) {<br /> b4[ b4Posn++ ] = source[i]; // Save non-whitespace<br /> if( b4Posn > 3 ) { // Time to decode?<br /> outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn, options );<br /> b4Posn = 0;<br /> // If that was the equals sign, break out of 'for' loop<br /> if( source[i] == EQUALS_SIGN ) {<br /> break;<br /> } // end if: equals sign<br /> } // end if: quartet built<br /> } // end if: equals sign or better<br /> } // end if: white space, equals sign or better<br /> else {<br /> // There's a bad input character in the Base64 stream.<br /> throw new java.io.IOException( String.format(<br /> "Bad Base64 input character decimal %d in array position %d", ((int)source[i])&0xFF, i ) );<br /> } // end else:<br /> } // each input character<br /> byte[] out = new byte[ outBuffPosn ];<br /> System.arraycopy( outBuff, 0, out, 0, outBuffPosn );<br /> return out;<br /> } // end decode<br /> /**<br /> * Decodes data from Base64 notation, automatically<br /> * detecting gzip-compressed data and decompressing it.<br /> *<br /> * @param s the string to decode<br /> * @return the decoded data<br /> * @throws java.io.IOException If there is a problem<br /> * @since 1.4<br /> */<br /> public static byte[] decode( String s ) throws java.io.IOException {<br /> return decode( s, NO_OPTIONS );<br /> }<br /> /**<br /> * Decodes data from Base64 notation, automatically<br /> * detecting gzip-compressed data and decompressing it.<br /> *<br /> * @param s the string to decode<br /> * @param options encode options such as URL_SAFE<br /> * @return the decoded data<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if <tt>s</tt> is null<br /> * @since 1.4<br /> */<br /> public static byte[] decode( String s, int options ) throws java.io.IOException {<br /> if( s == null ){<br /> throw new NullPointerException( "Input string was null." );<br /> } // end if<br /> byte[] bytes;<br /> try {<br /> bytes = s.getBytes( PREFERRED_ENCODING );<br /> } // end try<br /> catch( java.io.UnsupportedEncodingException uee ) {<br /> bytes = s.getBytes();<br /> } // end catch<br /> //</change><br /> // Decode<br /> bytes = decode( bytes, 0, bytes.length, options );<br /> // Check to see if it's gzip-compressed<br /> // GZIP Magic Two-Byte Number: 0x8b1f (35615)<br /> boolean dontGunzip = (options & DONT_GUNZIP) != 0;<br /> if( (bytes != null) && (bytes.length >= 4) && (!dontGunzip) ) {<br /> int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);<br /> if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head ) {<br /> java.io.ByteArrayInputStream bais = null;<br /> java.util.zip.GZIPInputStream gzis = null;<br /> java.io.ByteArrayOutputStream baos = null;<br /> byte[] buffer = new byte[2048];<br /> int length = 0;<br /> try {<br /> baos = new java.io.ByteArrayOutputStream();<br /> bais = new java.io.ByteArrayInputStream( bytes );<br /> gzis = new java.util.zip.GZIPInputStream( bais );<br /> while( ( length = gzis.read( buffer ) ) >= 0 ) {<br /> baos.write(buffer,0,length);<br /> } // end while: reading input<br /> // No error? Get new bytes.<br /> bytes = baos.toByteArray();<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> e.printStackTrace();<br /> // Just return originally-decoded bytes<br /> } // end catch<br /> finally {<br /> try{ baos.close(); } catch( Exception e ){}<br /> try{ gzis.close(); } catch( Exception e ){}<br /> try{ bais.close(); } catch( Exception e ){}<br /> } // end finally<br /> } // end if: gzipped<br /> } // end if: bytes.length >= 2<br /> return bytes;<br /> } // end decode<br /> /**<br /> * Attempts to decode Base64 data and deserialize a Java<br /> * Object within. Returns <tt>null</tt> if there was an error.<br /> *<br /> * @param encodedObject The Base64 data to decode<br /> * @return The decoded and deserialized object<br /> * @throws NullPointerException if encodedObject is null<br /> * @throws java.io.IOException if there is a general error<br /> * @throws ClassNotFoundException if the decoded object is of a<br /> * class that cannot be found by the JVM<br /> * @since 1.5<br /> */<br /> public static Object decodeToObject( String encodedObject )<br /> throws java.io.IOException, java.lang.ClassNotFoundException {<br /> return decodeToObject(encodedObject,NO_OPTIONS,null);<br /> }<br /> /**<br /> * Attempts to decode Base64 data and deserialize a Java<br /> * Object within. Returns <tt>null</tt> if there was an error.<br /> * If <tt>loader</tt> is not null, it will be the class loader<br /> * used when deserializing.<br /> *<br /> * @param encodedObject The Base64 data to decode<br /> * @param options Various parameters related to decoding<br /> * @param loader Optional class loader to use in deserializing classes.<br /> * @return The decoded and deserialized object<br /> * @throws NullPointerException if encodedObject is null<br /> * @throws java.io.IOException if there is a general error<br /> * @throws ClassNotFoundException if the decoded object is of a<br /> * class that cannot be found by the JVM<br /> * @since 2.3.4<br /> */<br /> public static Object decodeToObject(<br /> String encodedObject, int options, final ClassLoader loader )<br /> throws java.io.IOException, java.lang.ClassNotFoundException {<br /> // Decode and gunzip if necessary<br /> byte[] objBytes = decode( encodedObject, options );<br /> java.io.ByteArrayInputStream bais = null;<br /> java.io.ObjectInputStream ois = null;<br /> Object obj = null;<br /> try {<br /> bais = new java.io.ByteArrayInputStream( objBytes );<br /> // If no custom class loader is provided, use Java's builtin OIS.<br /> if( loader == null ){<br /> ois = new java.io.ObjectInputStream( bais );<br /> } // end if: no loader provided<br /> // Else make a customized object input stream that uses<br /> // the provided class loader.<br /> else {<br /> ois = new java.io.ObjectInputStream(bais){<br /> @Override<br /> public Class<?> resolveClass(java.io.ObjectStreamClass streamClass)<br /> throws java.io.IOException, ClassNotFoundException {<br /> Class c = Class.forName(streamClass.getName(), false, loader);<br /> if( c == null ){<br /> return super.resolveClass(streamClass);<br /> } else {<br /> return c; // Class loader knows of this class.<br /> } // end else: not null<br /> } // end resolveClass<br /> }; // end ois<br /> } // end else: no custom class loader<br /> obj = ois.readObject();<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and throw in order to execute finally{}<br /> } // end catch<br /> catch( java.lang.ClassNotFoundException e ) {<br /> throw e; // Catch and throw in order to execute finally{}<br /> } // end catch<br /> finally {<br /> try{ bais.close(); } catch( Exception e ){}<br /> try{ ois.close(); } catch( Exception e ){}<br /> } // end finally<br /> return obj;<br /> } // end decodeObject<br /> /**<br /> * Convenience method for encoding data to a file.<br /> *<br /> * <p>As of v 2.3, if there is a error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned false, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * @param dataToEncode byte array of data to encode in base64 form<br /> * @param filename Filename for saving encoded data<br /> * @throws java.io.IOException if there is an error<br /> * @throws NullPointerException if dataToEncode is null<br /> * @since 2.1<br /> */<br /> public static void encodeToFile( byte[] dataToEncode, String filename )<br /> throws java.io.IOException {<br /> if( dataToEncode == null ){<br /> throw new NullPointerException( "Data to encode was null." );<br /> } // end iff<br /> Base64.OutputStream bos = null;<br /> try {<br /> bos = new Base64.OutputStream(<br /> new java.io.FileOutputStream( filename ), Base64.ENCODE );<br /> bos.write( dataToEncode );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and throw to execute finally{} block<br /> } // end catch: java.io.IOException<br /> finally {<br /> try{ bos.close(); } catch( Exception e ){}<br /> } // end finally<br /> } // end encodeToFile<br /> /**<br /> * Convenience method for decoding data to a file.<br /> *<br /> * <p>As of v 2.3, if there is a error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned false, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * @param dataToDecode Base64-encoded data as a string<br /> * @param filename Filename for saving decoded data<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.1<br /> */<br /> public static void decodeToFile( String dataToDecode, String filename )<br /> throws java.io.IOException {<br /> Base64.OutputStream bos = null;<br /> try{<br /> bos = new Base64.OutputStream(<br /> new java.io.FileOutputStream( filename ), Base64.DECODE );<br /> bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and throw to execute finally{} block<br /> } // end catch: java.io.IOException<br /> finally {<br /> try{ bos.close(); } catch( Exception e ){}<br /> } // end finally<br /> } // end decodeToFile<br /> /**<br /> * Convenience method for reading a base64-encoded<br /> * file and decoding it.<br /> *<br /> * <p>As of v 2.3, if there is a error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned false, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * @param filename Filename for reading encoded data<br /> * @return decoded byte array<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.1<br /> */<br /> public static byte[] decodeFromFile( String filename )<br /> throws java.io.IOException {<br /> byte[] decodedData = null;<br /> Base64.InputStream bis = null;<br /> try<br /> {<br /> // Set up some useful variables<br /> java.io.File file = new java.io.File( filename );<br /> byte[] buffer = null;<br /> int length = 0;<br /> int numBytes = 0;<br /> // Check for size of file<br /> if( file.length() > Integer.MAX_VALUE )<br /> {<br /> throw new java.io.IOException( "File is too big for this convenience method (" + file.length() + " bytes)." );<br /> } // end if: file too big for int index<br /> buffer = new byte[ (int)file.length() ];<br /> // Open a stream<br /> bis = new Base64.InputStream(<br /> new java.io.BufferedInputStream(<br /> new java.io.FileInputStream( file ) ), Base64.DECODE );<br /> // Read until done<br /> while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {<br /> length += numBytes;<br /> } // end while<br /> // Save in a variable to return<br /> decodedData = new byte[ length ];<br /> System.arraycopy( buffer, 0, decodedData, 0, length );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and release to execute finally{}<br /> } // end catch: java.io.IOException<br /> finally {<br /> try{ bis.close(); } catch( Exception e) {}<br /> } // end finally<br /> return decodedData;<br /> } // end decodeFromFile<br /> /**<br /> * Convenience method for reading a binary file<br /> * and base64-encoding it.<br /> *<br /> * <p>As of v 2.3, if there is a error,<br /> * the method will throw an java.io.IOException. <b>This is new to v2.3!</b><br /> * In earlier versions, it just returned false, but<br /> * in retrospect that's a pretty poor way to handle it.</p><br /> *<br /> * @param filename Filename for reading binary data<br /> * @return base64-encoded string<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.1<br /> */<br /> public static String encodeFromFile( String filename )<br /> throws java.io.IOException {<br /> String encodedData = null;<br /> Base64.InputStream bis = null;<br /> try<br /> {<br /> // Set up some useful variables<br /> java.io.File file = new java.io.File( filename );<br /> byte[] buffer = new byte[ Math.max((int)(file.length() * 1.4+1),40) ]; // Need max() for math on small files (v2.2.1); Need +1 for a few corner cases (v2.3.5)<br /> int length = 0;<br /> int numBytes = 0;<br /> // Open a stream<br /> bis = new Base64.InputStream(<br /> new java.io.BufferedInputStream(<br /> new java.io.FileInputStream( file ) ), Base64.ENCODE );<br /> // Read until done<br /> while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {<br /> length += numBytes;<br /> } // end while<br /> // Save in a variable to return<br /> encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and release to execute finally{}<br /> } // end catch: java.io.IOException<br /> finally {<br /> try{ bis.close(); } catch( Exception e) {}<br /> } // end finally<br /> return encodedData;<br /> } // end encodeFromFile<br /> /**<br /> * Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>.<br /> *<br /> * @param infile Input file<br /> * @param outfile Output file<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.2<br /> */<br /> public static void encodeFileToFile( String infile, String outfile )<br /> throws java.io.IOException {<br /> String encoded = Base64.encodeFromFile( infile );<br /> java.io.OutputStream out = null;<br /> try{<br /> out = new java.io.BufferedOutputStream(<br /> new java.io.FileOutputStream( outfile ) );<br /> out.write( encoded.getBytes("US-ASCII") ); // Strict, 7-bit output.<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and release to execute finally{}<br /> } // end catch<br /> finally {<br /> try { out.close(); }<br /> catch( Exception ex ){}<br /> } // end finally<br /> } // end encodeFileToFile<br /> /**<br /> * Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>.<br /> *<br /> * @param infile Input file<br /> * @param outfile Output file<br /> * @throws java.io.IOException if there is an error<br /> * @since 2.2<br /> */<br /> public static void decodeFileToFile( String infile, String outfile )<br /> throws java.io.IOException {<br /> byte[] decoded = Base64.decodeFromFile( infile );<br /> java.io.OutputStream out = null;<br /> try{<br /> out = new java.io.BufferedOutputStream(<br /> new java.io.FileOutputStream( outfile ) );<br /> out.write( decoded );<br /> } // end try<br /> catch( java.io.IOException e ) {<br /> throw e; // Catch and release to execute finally{}<br /> } // end catch<br /> finally {<br /> try { out.close(); }<br /> catch( Exception ex ){}<br /> } // end finally<br /> } // end decodeFileToFile<br /> /* ******** I N N E R C L A S S I N P U T S T R E A M ******** */<br /> /**<br /> * A {@link Base64.InputStream} will read data from another<br /> * <tt>java.io.InputStream</tt>, given in the constructor,<br /> * and encode/decode to/from Base64 notation on the fly.<br /> *<br /> * @see Base64<br /> * @since 1.3<br /> */<br /> public static class InputStream extends java.io.FilterInputStream {<br /> private boolean encode; // Encoding or decoding<br /> private int position; // Current position in the buffer<br /> private byte[] buffer; // Small buffer holding converted data<br /> private int bufferLength; // Length of buffer (3 or 4)<br /> private int numSigBytes; // Number of meaningful bytes in the buffer<br /> private int lineLength;<br /> private boolean breakLines; // Break lines at less than 80 characters<br /> private int options; // Record options used to create the stream.<br /> private byte[] decodabet; // Local copies to avoid extra method calls<br /> /**<br /> * Constructs a {@link Base64.InputStream} in DECODE mode.<br /> *<br /> * @param in the <tt>java.io.InputStream</tt> from which to read data.<br /> * @since 1.3<br /> */<br /> public InputStream( java.io.InputStream in ) {<br /> this( in, DECODE );<br /> } // end constructor<br /> /**<br /> * Constructs a {@link Base64.InputStream} in<br /> * either ENCODE or DECODE mode.<br /> * <p><br /> * Valid options:<pre><br /> * ENCODE or DECODE: Encode or Decode as data is read.<br /> * DO_BREAK_LINES: break lines at 76 characters<br /> * (only meaningful when encoding)</i><br /> * </pre><br /> * <p><br /> * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code><br /> *<br /> *<br /> * @param in the <tt>java.io.InputStream</tt> from which to read data.<br /> * @param options Specified options<br /> * @see Base64#ENCODE<br /> * @see Base64#DECODE<br /> * @see Base64#DO_BREAK_LINES<br /> * @since 2.0<br /> */<br /> public InputStream( java.io.InputStream in, int options ) {<br /> super( in );<br /> this.options = options; // Record for later<br /> this.breakLines = (options & DO_BREAK_LINES) > 0;<br /> this.encode = (options & ENCODE) > 0;<br /> this.bufferLength = encode ? 4 : 3;<br /> this.buffer = new byte[ bufferLength ];<br /> this.position = -1;<br /> this.lineLength = 0;<br /> this.decodabet = getDecodabet(options);<br /> } // end constructor<br /> /**<br /> * Reads enough of the input stream to convert<br /> * to/from Base64 and returns the next byte.<br /> *<br /> * @return next byte<br /> * @since 1.3<br /> */<br /> @Override<br /> public int read() throws java.io.IOException {<br /> // Do we need to get data?<br /> if( position < 0 ) {<br /> if( encode ) {<br /> byte[] b3 = new byte[3];<br /> int numBinaryBytes = 0;<br /> for( int i = 0; i < 3; i++ ) {<br /> int b = in.read();<br /> // If end of stream, b is -1.<br /> if( b >= 0 ) {<br /> b3[i] = (byte)b;<br /> numBinaryBytes++;<br /> } else {<br /> break; // out of for loop<br /> } // end else: end of stream<br /> } // end for: each needed input byte<br /> if( numBinaryBytes > 0 ) {<br /> encode3to4( b3, 0, numBinaryBytes, buffer, 0, options );<br /> position = 0;<br /> numSigBytes = 4;<br /> } // end if: got data<br /> else {<br /> return -1; // Must be end of stream<br /> } // end else<br /> } // end if: encoding<br /> // Else decoding<br /> else {<br /> byte[] b4 = new byte[4];<br /> int i = 0;<br /> for( i = 0; i < 4; i++ ) {<br /> // Read four "meaningful" bytes:<br /> int b = 0;<br /> do{ b = in.read(); }<br /> while( b >= 0 && decodabet[ b & 0x7f ] <= WHITE_SPACE_ENC );<br /> if( b < 0 ) {<br /> break; // Reads a -1 if end of stream<br /> } // end if: end of stream<br /> b4[i] = (byte)b;<br /> } // end for: each needed input byte<br /> if( i == 4 ) {<br /> numSigBytes = decode4to3( b4, 0, buffer, 0, options );<br /> position = 0;<br /> } // end if: got four characters<br /> else if( i == 0 ){<br /> return -1;<br /> } // end else if: also padded correctly<br /> else {<br /> // Must have broken out from above.<br /> throw new java.io.IOException( "Improperly padded Base64 input." );<br /> } // end<br /> } // end else: decode<br /> } // end else: get data<br /> // Got data?<br /> if( position >= 0 ) {<br /> // End of relevant data?<br /> if( /*!encode &&*/ position >= numSigBytes ){<br /> return -1;<br /> } // end if: got data<br /> if( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) {<br /> lineLength = 0;<br /> return '/n';<br /> } // end if<br /> else {<br /> lineLength++; // This isn't important when decoding<br /> // but throwing an extra "if" seems<br /> // just as wasteful.<br /> int b = buffer[ position++ ];<br /> if( position >= bufferLength ) {<br /> position = -1;<br /> } // end if: end<br /> return b & 0xFF; // This is how you "cast" a byte that's<br /> // intended to be unsigned.<br /> } // end else<br /> } // end if: position >= 0<br /> // Else error<br /> else {<br /> throw new java.io.IOException( "Error in Base64 code reading stream." );<br /> } // end else<br /> } // end read<br /> /**<br /> * Calls {@link #read()} repeatedly until the end of stream<br /> * is reached or <var>len</var> bytes are read.<br /> * Returns number of bytes read into array or -1 if<br /> * end of stream is encountered.<br /> *<br /> * @param dest array to hold values<br /> * @param off offset for array<br /> * @param len max number of bytes to read into array<br /> * @return bytes read into array or -1 if end of stream is encountered.<br /> * @since 1.3<br /> */<br /> @Override<br /> public int read( byte[] dest, int off, int len )<br /> throws java.io.IOException {<br /> int i;<br /> int b;<br /> for( i = 0; i < len; i++ ) {<br /> b = read();<br /> if( b >= 0 ) {<br /> dest[off + i] = (byte) b;<br /> }<br /> else if( i == 0 ) {<br /> return -1;<br /> }<br /> else {<br /> break; // Out of 'for' loop<br /> } // Out of 'for' loop<br /> } // end for: each byte read<br /> return i;<br /> } // end read<br /> } // end inner class InputStream<br /> /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */<br /> /**<br /> * A {@link Base64.OutputStream} will write data to another<br /> * <tt>java.io.OutputStream</tt>, given in the constructor,<br /> * and encode/decode to/from Base64 notation on the fly.<br /> *<br /> * @see Base64<br /> * @since 1.3<br /> */<br /> public static class OutputStream extends java.io.FilterOutputStream {<br /> private boolean encode;<br /> private int position;<br /> private byte[] buffer;<br /> private int bufferLength;<br /> private int lineLength;<br /> private boolean breakLines;<br /> private byte[] b4; // Scratch used in a few places<br /> private boolean suspendEncoding;<br /> private int options; // Record for later<br /> private byte[] decodabet; // Local copies to avoid extra method calls<br /> /**<br /> * Constructs a {@link Base64.OutputStream} in ENCODE mode.<br /> *<br /> * @param out the <tt>java.io.OutputStream</tt> to which data will be written.<br /> * @since 1.3<br /> */<br /> public OutputStream( java.io.OutputStream out ) {<br /> this( out, ENCODE );<br /> } // end constructor<br /> /**<br /> * Constructs a {@link Base64.OutputStream} in<br /> * either ENCODE or DECODE mode.<br /> * <p><br /> * Valid options:<pre><br /> * ENCODE or DECODE: Encode or Decode as data is read.<br /> * DO_BREAK_LINES: don't break lines at 76 characters<br /> * (only meaningful when encoding)</i><br /> * </pre><br /> * <p><br /> * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code><br /> *<br /> * @param out the <tt>java.io.OutputStream</tt> to which data will be written.<br /> * @param options Specified options.<br /> * @see Base64#ENCODE<br /> * @see Base64#DECODE<br /> * @see Base64#DO_BREAK_LINES<br /> * @since 1.3<br /> */<br /> public OutputStream( java.io.OutputStream out, int options ) {<br /> super( out );<br /> this.breakLines = (options & DO_BREAK_LINES) != 0;<br /> this.encode = (options & ENCODE) != 0;<br /> this.bufferLength = encode ? 3 : 4;<br /> this.buffer = new byte[ bufferLength ];<br /> this.position = 0;<br /> this.lineLength = 0;<br /> this.suspendEncoding = false;<br /> this.b4 = new byte[4];<br /> this.options = options;<br /> this.decodabet = getDecodabet(options);<br /> } // end constructor<br /> /**<br /> * Writes the byte to the output stream after<br /> * converting to/from Base64 notation.<br /> * When encoding, bytes are buffered three<br /> * at a time before the output stream actually<br /> * gets a write() call.<br /> * When decoding, bytes are buffered four<br /> * at a time.<br /> *<br /> * @param theByte the byte to write<br /> * @since 1.3<br /> */<br /> @Override<br /> public void write(int theByte)<br /> throws java.io.IOException {<br /> // Encoding suspended?<br /> if( suspendEncoding ) {<br /> this.out.write( theByte );<br /> return;<br /> } // end if: supsended<br /> // Encode?<br /> if( encode ) {<br /> buffer[ position++ ] = (byte)theByte;<br /> if( position >= bufferLength ) { // Enough to encode.<br /> this.out.write( encode3to4( b4, buffer, bufferLength, options ) );<br /> lineLength += 4;<br /> if( breakLines && lineLength >= MAX_LINE_LENGTH ) {<br /> this.out.write( NEW_LINE );<br /> lineLength = 0;<br /> } // end if: end of line<br /> position = 0;<br /> } // end if: enough to output<br /> } // end if: encoding<br /> // Else, Decoding<br /> else {<br /> // Meaningful Base64 character?<br /> if( decodabet[ theByte & 0x7f ] > WHITE_SPACE_ENC ) {<br /> buffer[ position++ ] = (byte)theByte;<br /> if( position >= bufferLength ) { // Enough to output.<br /> int len = Base64.decode4to3( buffer, 0, b4, 0, options );<br /> out.write( b4, 0, len );<br /> position = 0;<br /> } // end if: enough to output<br /> } // end if: meaningful base64 character<br /> else if( decodabet[ theByte & 0x7f ] != WHITE_SPACE_ENC ) {<br /> throw new java.io.IOException( "Invalid character in Base64 data." );<br /> } // end else: not white space either<br /> } // end else: decoding<br /> } // end write<br /> /**<br /> * Calls {@link #write(int)} repeatedly until <var>len</var><br /> * bytes are written.<br /> *<br /> * @param theBytes array from which to read bytes<br /> * @param off offset for array<br /> * @param len max number of bytes to read into array<br /> * @since 1.3<br /> */<br /> @Override<br /> public void write( byte[] theBytes, int off, int len )<br /> throws java.io.IOException {<br /> // Encoding suspended?<br /> if( suspendEncoding ) {<br /> this.out.write( theBytes, off, len );<br /> return;<br /> } // end if: supsended<br /> for( int i = 0; i < len; i++ ) {<br /> write( theBytes[ off + i ] );<br /> } // end for: each byte written<br /> } // end write<br /> /**<br /> * Method added by PHIL. [Thanks, PHIL. -Rob]<br /> * This pads the buffer without closing the stream.<br /> * @throws java.io.IOException if there's an error.<br /> */<br /> public void flushBase64() throws java.io.IOException {<br /> if( position > 0 ) {<br /> if( encode ) {<br /> out.write( encode3to4( b4, buffer, position, options ) );<br /> position = 0;<br /> } // end if: encoding<br /> else {<br /> throw new java.io.IOException( "Base64 input not properly padded." );<br /> } // end else: decoding<br /> } // end if: buffer partially full<br /> } // end flush<br /> /**<br /> * Flushes and closes (I think, in the superclass) the stream.<br /> *<br /> * @since 1.3<br /> */<br /> @Override<br /> public void close() throws java.io.IOException {<br /> // 1. Ensure that pending characters are written<br /> flushBase64();<br /> // 2. Actually close the stream<br /> // Base class both flushes and closes.<br /> super.close();<br /> buffer = null;<br /> out = null;<br /> } // end close<br /> /**<br /> * Suspends encoding of the stream.<br /> * May be helpful if you need to embed a piece of<br /> * base64-encoded data in a stream.<br /> *<br /> * @throws java.io.IOException if there's an error flushing<br /> * @since 1.5.1<br /> */<br /> public void suspendEncoding() throws java.io.IOException {<br /> flushBase64();<br /> this.suspendEncoding = true;<br /> } // end suspendEncoding<br /> /**<br /> * Resumes encoding of the stream.<br /> * May be helpful if you need to embed a piece of<br /> * base64-encoded data in a stream.<br /> *<br /> * @since 1.5.1<br /> */<br /> public void resumeEncoding() {<br /> this.suspendEncoding = false;<br /> } // end resumeEncoding<br /> } // end inner class OutputStream<br /> } // end class Base64<br />

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