jaxws/src/java.xml.ws/share/classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/UUDecoderStream.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /*
  * @(#)UUDecoderStream.java   1.8 02/07/08
  */


 package com.sun.xml.internal.messaging.saaj.packaging.mime.util;

 import java.io.*;

 /**
  * This class implements a UUDecoder. It is implemented as
  * a FilterInputStream, so one can just wrap this class around
  * any input stream and read bytes from this filter. The decoding
  * is done as the bytes are read out.
  *
  * @author John Mani
  * @author Bill Shannon
  */

 public class UUDecoderStream extends FilterInputStream {
     private String name;
     private int mode;

     private byte[] buffer;      // cache of decoded bytes
     private int bufsize = 0;    // size of the cache
     private int index = 0;      // index into the cache
     private boolean gotPrefix = false;
     private boolean gotEnd = false;
     private LineInputStream lin;

     /**
      * Create a UUdecoder that decodes the specified input stream
      * @param in        the input stream
      */
     public UUDecoderStream(InputStream in) {
         super(in);
         lin = new LineInputStream(in);
         buffer = new byte[45]; // max decoded chars in a line = 45
     }

     /**
      * Read the next decoded byte from this input stream. The byte
      * is returned as an <code>int</code> in the range <code>0</code>
      * to <code>255</code>. If no byte is available because the end of
      * the stream has been reached, the value <code>-1</code> is returned.
      * This method blocks until input data is available, the end of the
      * stream is detected, or an exception is thrown.
      *
      * @return     next byte of data, or <code>-1</code> if the end of
      *             stream is reached.
      * @exception  IOException  if an I/O error occurs.
      * @see        java.io.FilterInputStream#in
      */

     public int read() throws IOException {
         if (index >= bufsize) {
             readPrefix();
             if (!decode())
                 return -1;
             index = 0; // reset index into buffer
         }
         return buffer[index++] & 0xff; // return lower byte
     }

     public int read(byte[] buf, int off, int len) throws IOException {
         int i, c;
         for (i = 0; i < len; i++) {
             if ((c = read()) == -1) {
                 if (i == 0) // At end of stream, so we should
                     i = -1; // return -1, NOT 0.
                 break;
             }
             buf[off+i] = (byte)c;
         }
         return i;
     }

     public boolean markSupported() {
         return false;
     }

     public int available() throws IOException {
          // This is only an estimate, since in.available()
          // might include CRLFs too ..
          return ((in.available() * 3)/4 + (bufsize-index));
     }

     /**
      * Get the "name" field from the prefix. This is meant to
      * be the pathname of the decoded file
      *
      * @return     name of decoded file
      * @exception  IOException  if an I/O error occurs.
      */
     public String getName() throws IOException {
         readPrefix();
         return name;
     }

     /**
      * Get the "mode" field from the prefix. This is the permission
      * mode of the source file.
      *
      * @return     permission mode of source file
      * @exception  IOException  if an I/O error occurs.
      */
     public int getMode() throws IOException {
         readPrefix();
         return mode;
     }

     /**
      * UUencoded streams start off with the line:
      *  "begin <mode> <filename>"
      * Search for this prefix and gobble it up.
      */
     private void readPrefix() throws IOException {
         if (gotPrefix) // got the prefix
             return;

         String s;
         for (;;) {
             // read till we get the prefix: "begin MODE FILENAME"
             s = lin.readLine(); // NOTE: readLine consumes CRLF pairs too
             if (s == null)
                 throw new IOException("UUDecoder error: No Begin");
             if (s.regionMatches(true, 0, "begin", 0, 5)) {
                 try {
                     mode = Integer.parseInt(s.substring(6,9));
                 } catch (NumberFormatException ex) {
                     throw new IOException("UUDecoder error: " + ex.toString());
                 }
                 name = s.substring(10);
                 gotPrefix = true;
                 return;
             }
         }
     }

     private boolean decode() throws IOException {

         if (gotEnd)
             return false;
         bufsize = 0;
         String line;
         do {
             line = lin.readLine();

             /*
              * Improperly encoded data sometimes omits the zero length
              * line that starts with a space character, we detect the
              * following "end" line here.
              */
             if (line == null)
                 throw new IOException("Missing End");
             if (line.regionMatches(true, 0, "end", 0, 3)) {
                 gotEnd = true;
                 return false;
             }
         } while (line.length() == 0);
         int count = line.charAt(0);
         if (count < ' ')
             throw new IOException("Buffer format error");

         /*
          * The first character in a line is the number of original (not
          *  the encoded atoms) characters in the line. Note that all the
          *  code below has to handle the <SPACE> character that indicates
          *  end of encoded stream.
          */
         count = (count - ' ') & 0x3f;

         if (count == 0) {
             line = lin.readLine();
             if (line == null || !line.regionMatches(true, 0, "end", 0, 3))
                 throw new IOException("Missing End");
             gotEnd = true;
             return false;
         }

         int need = ((count * 8)+5)/6;
 //System.out.println("count " + count + ", need " + need + ", len " + line.length());
         if (line.length() < need + 1)
             throw new IOException("Short buffer error");

         int i = 1;
         byte a, b;
         /*
          * A correct uuencoder always encodes 3 characters at a time, even
          * if there aren't 3 characters left.  But since some people out
          * there have broken uuencoders we handle the case where they
          * don't include these "unnecessary" characters.
          */
         while (bufsize < count) {
             // continue decoding until we get 'count' decoded chars
             a = (byte)((line.charAt(i++) - ' ') & 0x3f);
             b = (byte)((line.charAt(i++) - ' ') & 0x3f);
             buffer[bufsize++] = (byte)(((a << 2) & 0xfc) | ((b >>> 4) & 3));

             if (bufsize < count) {
                 a = b;
                 b = (byte)((line.charAt(i++) - ' ') & 0x3f);
                 buffer[bufsize++] =
                                 (byte)(((a << 4) & 0xf0) | ((b >>> 2) & 0xf));
             }

             if (bufsize < count) {
                 a = b;
                 b = (byte)((line.charAt(i++) - ' ') & 0x3f);
                 buffer[bufsize++] = (byte)(((a << 6) & 0xc0) | (b & 0x3f));
             }
         }
         return true;
     }

     /*** begin TEST program *****
     public static void main(String argv[]) throws Exception {
         FileInputStream infile = new FileInputStream(argv[0]);
         UUDecoderStream decoder = new UUDecoderStream(infile);
         int c;

         try {
             while ((c = decoder.read()) != -1)
                 System.out.write(c);
             System.out.flush();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
     **** end TEST program ****/
 }
	/*
	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* @(#)UUDecoderStream.java 1.8 02/07/08
	*/



	package com.sun.xml.internal.messaging.saaj.packaging.mime.util;

	import java.io.*;

	/**
	* This class implements a UUDecoder. It is implemented as
	* a FilterInputStream, so one can just wrap this class around
	* any input stream and read bytes from this filter. The decoding
	* is done as the bytes are read out.
	*
	* @author John Mani
	* @author Bill Shannon
	*/

	public class UUDecoderStream extends FilterInputStream {
	private String name;
	private int mode;

	private byte[] buffer; // cache of decoded bytes
	private int bufsize = 0; // size of the cache
	private int index = 0; // index into the cache
	private boolean gotPrefix = false;
	private boolean gotEnd = false;
	private LineInputStream lin;

	/**
	* Create a UUdecoder that decodes the specified input stream
	* @param in the input stream
	*/
	public UUDecoderStream(InputStream in) {
	super(in);
	lin = new LineInputStream(in);
	buffer = new byte[45]; // max decoded chars in a line = 45
	}

	/**
	* Read the next decoded byte from this input stream. The byte
	* is returned as an <code>int</code> in the range <code>0</code>
	* to <code>255</code>. If no byte is available because the end of
	* the stream has been reached, the value <code>-1</code> is returned.
	* This method blocks until input data is available, the end of the
	* stream is detected, or an exception is thrown.
	*
	* @return next byte of data, or <code>-1</code> if the end of
	* stream is reached.
	* @exception IOException if an I/O error occurs.
	* @see java.io.FilterInputStream#in
	*/

	public int read() throws IOException {
	if (index >= bufsize) {
	readPrefix();
	if (!decode())
	return -1;
	index = 0; // reset index into buffer
	}
	return buffer[index++] & 0xff; // return lower byte
	}

	public int read(byte[] buf, int off, int len) throws IOException {
	int i, c;
	for (i = 0; i < len; i++) {
	if ((c = read()) == -1) {
	if (i == 0) // At end of stream, so we should
	i = -1; // return -1, NOT 0.
	break;
	}
	buf[off+i] = (byte)c;
	}
	return i;
	}

	public boolean markSupported() {
	return false;
	}

	public int available() throws IOException {
	// This is only an estimate, since in.available()
	// might include CRLFs too ..
	return ((in.available() * 3)/4 + (bufsize-index));
	}

	/**
	* Get the "name" field from the prefix. This is meant to
	* be the pathname of the decoded file
	*
	* @return name of decoded file
	* @exception IOException if an I/O error occurs.
	*/
	public String getName() throws IOException {
	readPrefix();
	return name;
	}

	/**
	* Get the "mode" field from the prefix. This is the permission
	* mode of the source file.
	*
	* @return permission mode of source file
	* @exception IOException if an I/O error occurs.
	*/
	public int getMode() throws IOException {
	readPrefix();
	return mode;
	}

	/**
	* UUencoded streams start off with the line:
	* "begin <mode> <filename>"
	* Search for this prefix and gobble it up.
	*/
	private void readPrefix() throws IOException {
	if (gotPrefix) // got the prefix
	return;

	String s;
	for (;;) {
	// read till we get the prefix: "begin MODE FILENAME"
	s = lin.readLine(); // NOTE: readLine consumes CRLF pairs too
	if (s == null)
	throw new IOException("UUDecoder error: No Begin");
	if (s.regionMatches(true, 0, "begin", 0, 5)) {
	try {
	mode = Integer.parseInt(s.substring(6,9));
	} catch (NumberFormatException ex) {
	throw new IOException("UUDecoder error: " + ex.toString());
	}
	name = s.substring(10);
	gotPrefix = true;
	return;
	}
	}
	}

	private boolean decode() throws IOException {

	if (gotEnd)
	return false;
	bufsize = 0;
	String line;
	do {
	line = lin.readLine();

	/*
	* Improperly encoded data sometimes omits the zero length
	* line that starts with a space character, we detect the
	* following "end" line here.
	*/
	if (line == null)
	throw new IOException("Missing End");
	if (line.regionMatches(true, 0, "end", 0, 3)) {
	gotEnd = true;
	return false;
	}
	} while (line.length() == 0);
	int count = line.charAt(0);
	if (count < ' ')
	throw new IOException("Buffer format error");

	/*
	* The first character in a line is the number of original (not
	* the encoded atoms) characters in the line. Note that all the
	* code below has to handle the <SPACE> character that indicates
	* end of encoded stream.
	*/
	count = (count - ' ') & 0x3f;

	if (count == 0) {
	line = lin.readLine();
	if (line == null \|\| !line.regionMatches(true, 0, "end", 0, 3))
	throw new IOException("Missing End");
	gotEnd = true;
	return false;
	}

	int need = ((count * 8)+5)/6;
	//System.out.println("count " + count + ", need " + need + ", len " + line.length());
	if (line.length() < need + 1)
	throw new IOException("Short buffer error");

	int i = 1;
	byte a, b;
	/*
	* A correct uuencoder always encodes 3 characters at a time, even
	* if there aren't 3 characters left. But since some people out
	* there have broken uuencoders we handle the case where they
	* don't include these "unnecessary" characters.
	*/
	while (bufsize < count) {
	// continue decoding until we get 'count' decoded chars
	a = (byte)((line.charAt(i++) - ' ') & 0x3f);
	b = (byte)((line.charAt(i++) - ' ') & 0x3f);
	buffer[bufsize++] = (byte)(((a << 2) & 0xfc) \| ((b >>> 4) & 3));

	if (bufsize < count) {
	a = b;
	b = (byte)((line.charAt(i++) - ' ') & 0x3f);
	buffer[bufsize++] =
	(byte)(((a << 4) & 0xf0) \| ((b >>> 2) & 0xf));
	}

	if (bufsize < count) {
	a = b;
	b = (byte)((line.charAt(i++) - ' ') & 0x3f);
	buffer[bufsize++] = (byte)(((a << 6) & 0xc0) \| (b & 0x3f));
	}
	}
	return true;
	}

	/* begin TEST program ***
	public static void main(String argv[]) throws Exception {
	FileInputStream infile = new FileInputStream(argv[0]);
	UUDecoderStream decoder = new UUDecoderStream(infile);
	int c;

	try {
	while ((c = decoder.read()) != -1)
	System.out.write(c);
	System.out.flush();
	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	** end TEST program **/
	}