jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/BASE64DecoderStream.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/BASE64DecoderStream.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/BASE64DecoderStream.java

Thu, 31 Aug 2017 15:18:52 +0800

author: aoqi
date: Thu, 31 Aug 2017 15:18:52 +0800
changeset 637: 9c07ef4934dd
parent 368: 0989ad8c0860
parent 0: 373ffda63c9a
permissions: -rw-r--r--

merge

 /*
  * 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.
  */
 /*
  * @(#)BASE64DecoderStream.java       1.8 02/03/27
  */
 package com.sun.xml.internal.messaging.saaj.packaging.mime.util;
 import java.io.*;
 /**
  * This class implements a BASE64 Decoder. 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 BASE64DecoderStream extends FilterInputStream {
     private byte[] buffer;      // cache of decoded bytes
     private int bufsize = 0;    // size of the cache
     private int index = 0;      // index into the cache
     /**
      * Create a BASE64 decoder that decodes the specified input stream
      * @param in        the input stream
      */
     public BASE64DecoderStream(InputStream in) {
         super(in);
         buffer = new byte[3];
     }
     /**
      * 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 the
      *             stream is reached.
      * @exception  IOException  if an I/O error occurs.
      * @see        java.io.FilterInputStream#in
      */
     public int read() throws IOException {
         if (index >= bufsize) {
             decode(); // Fills up buffer
             if (bufsize == 0) // buffer is empty
                 return -1;
             index = 0; // reset index into buffer
         }
         return buffer[index++] & 0xff; // Zero off the MSB
     }
     /**
      * Reads up to <code>len</code> decoded bytes of data from this input stream
      * into an array of bytes. This method blocks until some input is
      * available.
      * <p>
      *
      * @param      buf   the buffer into which the data is read.
      * @param      off   the start offset of the data.
      * @param      len   the maximum number of bytes read.
      * @return     the total number of bytes read into the buffer, or
      *             <code>-1</code> if there is no more data because the end of
      *             the stream has been reached.
      * @exception  IOException  if an I/O error occurs.
      */
     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;
     }
     /**
      * Tests if this input stream supports marks. Currently this class
      * does not support marks
      */
     public boolean markSupported() {
         return false; // Maybe later ..
     }
     /**
      * Returns the number of bytes that can be read from this input
      * stream without blocking. However, this figure is only
      * a close approximation in case the original encoded stream
      * contains embedded CRLFs; since the CRLFs are discarded, not decoded
      */
     public int available() throws IOException {
          // This is only an estimate, since in.available()
          // might include CRLFs too ..
          return ((in.available() * 3)/4 + (bufsize-index));
     }
     /**
      * This character array provides the character to value map
      * based on RFC1521.
      */
     private final static char pem_array[] = {
         'A','B','C','D','E','F','G','H', // 0
         'I','J','K','L','M','N','O','P', // 1
         'Q','R','S','T','U','V','W','X', // 2
         'Y','Z','a','b','c','d','e','f', // 3
         'g','h','i','j','k','l','m','n', // 4
         'o','p','q','r','s','t','u','v', // 5
         'w','x','y','z','0','1','2','3', // 6
         '4','5','6','7','8','9','+','/'  // 7
     };
     private final static byte pem_convert_array[] = new byte[256];
     static {
         for (int i = 0; i < 255; i++)
             pem_convert_array[i] = -1;
         for(int i = 0; i < pem_array.length; i++)
             pem_convert_array[pem_array[i]] = (byte) i;
     }
     /* The decoder algorithm */
     private byte[] decode_buffer = new byte[4];
     private void decode() throws IOException {
         bufsize = 0;
         /*
          * We need 4 valid base64 characters before we start decoding.
          * We skip anything that's not a valid base64 character (usually
          * just CRLF).
          */
         int got = 0;
         while (got < 4) {
             int i = in.read();
             if (i == -1) {
                 if (got == 0)
                     return;     // EOF before any data is ok
                 throw new IOException("Error in encoded stream, got " + got);
             }
             if (i >= 0 && i < 256 && i == '=' || pem_convert_array[i] != -1)
                 decode_buffer[got++] = (byte)i;
         }
         byte a, b;
         a = pem_convert_array[decode_buffer[0] & 0xff];
         b = pem_convert_array[decode_buffer[1] & 0xff];
         // The first decoded byte
         buffer[bufsize++] = (byte)(((a << 2) & 0xfc) | ((b >>> 4) & 3));
         if (decode_buffer[2] == '=') // End of this BASE64 encoding
             return;
         a = b;
         b = pem_convert_array[decode_buffer[2] & 0xff];
         // The second decoded byte
         buffer[bufsize++] = (byte)(((a << 4) & 0xf0) | ((b >>> 2) & 0xf));
         if (decode_buffer[3] == '=') // End of this BASE64 encoding
             return;
         a = b;
         b = pem_convert_array[decode_buffer[3] & 0xff];
         // The third decoded byte
         buffer[bufsize++] = (byte)(((a << 6) & 0xc0) | (b & 0x3f));
     }
     /**
      * Base64 decode a byte array.  No line breaks are allowed.
      * This method is suitable for short strings, such as those
      * in the IMAP AUTHENTICATE protocol, but not to decode the
      * entire content of a MIME part.
      *
      * NOTE: inbuf may only contain valid base64 characters.
      *       Whitespace is not ignored.
      */
     public static byte[] decode(byte[] inbuf) {
         int size = (inbuf.length / 4) * 3;
         if (size == 0)
             return inbuf;
         if (inbuf[inbuf.length - 1] == '=') {
             size--;
             if (inbuf[inbuf.length - 2] == '=')
                 size--;
         }
         byte[] outbuf = new byte[size];
         int inpos = 0, outpos = 0;
         size = inbuf.length;
         while (size > 0) {
             byte a, b;
             a = pem_convert_array[inbuf[inpos++] & 0xff];
             b = pem_convert_array[inbuf[inpos++] & 0xff];
             // The first decoded byte
             outbuf[outpos++] = (byte)(((a << 2) & 0xfc) | ((b >>> 4) & 3));
             if (inbuf[inpos] == '=') // End of this BASE64 encoding
                 return outbuf;
             a = b;
             b = pem_convert_array[inbuf[inpos++] & 0xff];
             // The second decoded byte
             outbuf[outpos++] = (byte)(((a << 4) & 0xf0) | ((b >>> 2) & 0xf));
             if (inbuf[inpos] == '=') // End of this BASE64 encoding
                 return outbuf;
             a = b;
             b = pem_convert_array[inbuf[inpos++] & 0xff];
             // The third decoded byte
             outbuf[outpos++] = (byte)(((a << 6) & 0xc0) | (b & 0x3f));
             size -= 4;
         }
         return outbuf;
     }
     /*** begin TEST program ***
     public static void main(String argv[]) throws Exception {
         FileInputStream infile = new FileInputStream(argv[0]);
         BASE64DecoderStream decoder = new BASE64DecoderStream(infile);
         int c;
         while ((c = decoder.read()) != -1)
             System.out.print((char)c);
         System.out.flush();
     }
     *** end TEST program ***/
 }

Mercurial > jdk8-mips64-public > jaxws / annotate

src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/BASE64DecoderStream.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/messaging/saaj/packaging/mime/util/BASE64DecoderStream.java