Mercurial > jdk8-mips64-public > jaxws / file revision

 /*

  * Copyright (c) 1997, 2012, 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 ****/

 }