1    
2    /* ====================================================================
3     * The Apache Software License, Version 1.1
4     *
5     * Copyright (c) 2002 The Apache Software Foundation.  All rights
6     * reserved.
7     *
8     * Redistribution and use in source and binary forms, with or without
9     * modification, are permitted provided that the following conditions
10    * are met:
11    *
12    * 1. Redistributions of source code must retain the above copyright
13    *    notice, this list of conditions and the following disclaimer.
14    *
15    * 2. Redistributions in binary form must reproduce the above copyright
16    *    notice, this list of conditions and the following disclaimer in
17    *    the documentation and/or other materials provided with the
18    *    distribution.
19    *
20    * 3. The end-user documentation included with the redistribution,
21    *    if any, must include the following acknowledgment:
22    *       "This product includes software developed by the
23    *        Apache Software Foundation (http://www.apache.org/)."
24    *    Alternately, this acknowledgment may appear in the software itself,
25    *    if and wherever such third-party acknowledgments normally appear.
26    *
27    * 4. The names "Apache" and "Apache Software Foundation" and
28    *    "Apache POI" must not be used to endorse or promote products
29    *    derived from this software without prior written permission. For
30    *    written permission, please contact apache@apache.org.
31    *
32    * 5. Products derived from this software may not be called "Apache",
33    *    "Apache POI", nor may "Apache" appear in their name, without
34    *    prior written permission of the Apache Software Foundation.
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36    * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38    * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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42    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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45    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46    * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47    * SUCH DAMAGE.
48    * ====================================================================
49    *
50    * This software consists of voluntary contributions made by many
51    * individuals on behalf of the Apache Software Foundation.  For more
52    * information on the Apache Software Foundation, please see
53    * <http://www.apache.org/>.
54    */
55   
56   package org.apache.poi.hssf.record;
57   
58   import org.apache.poi.util.LittleEndian;
59   
60   /**
61    * Title:        Unknown Record (for debugging)<P>
62    * Description:  Unknown record just tells you the sid so you can figure out
63    *               what records you are missing.  Also helps us read/modify sheets we
64    *               don't know all the records to.  (HSSF leaves these alone!) <P>
65    * Company:      SuperLink Software, Inc.<P>
66    * @author Andrew C. Oliver (acoliver at apache dot org)
67    * @version 2.0-pre
68    */
69   
70   public class UnknownRecord
71       extends Record
72   {
73       private short  sid     = 0;
74       private short  size    = 0;
75       private byte[] thedata = null;
76       int            offset  = 0;
77   
78       public UnknownRecord()
79       {
80       }
81   
82       /**
83        * construct an unknown record.  No fields are interperated and the record will
84        * be serialized in its original form more or less
85        * @param id    id of the record -not validated, just stored for serialization
86        * @param size  size of the data
87        * @param data  the data
88        */
89   
90       public UnknownRecord(short id, short size, byte [] data)
91       {
92           sid     = id;
93           size    = size;
94           thedata = data;
95       }
96   
97       /**
98        * spit the record out AS IS.  no interperatation or identification
99        */
100  
101      public int serialize(int offset, byte [] data)
102      {
103          if (thedata == null)
104          {
105              thedata = new byte[ 0 ];
106          }
107          LittleEndian.putShort(data, 0 + offset, sid);
108          LittleEndian.putShort(data, 2 + offset, ( short ) (thedata.length));
109          if (thedata.length > 0)
110          {
111              System.arraycopy(thedata, 0, data, 4 + offset, thedata.length);
112          }
113          return getRecordSize();
114      }
115  
116      public int getRecordSize()
117      {
118          int retval = 4;
119  
120          if (thedata != null)
121          {
122              retval += thedata.length;
123          }
124          return retval;
125      }
126  
127      protected void fillFields(byte [] data, short sid)
128      {
129          sid     = sid;
130          thedata = data;
131      }
132  
133      /**
134       * NO OP!
135       */
136  
137      protected void validateSid(short id)
138      {
139  
140          // if we had a valid sid we wouldn't be using the "Unknown Record" record now would we?
141      }
142  
143      /**
144       * print a sort of string representation ([UNKNOWN RECORD] id = x [/UNKNOWN RECORD])
145       */
146  
147      public String toString()
148      {
149          StringBuffer buffer = new StringBuffer();
150  
151          buffer.append("[UNKNOWN RECORD]\n");
152          buffer.append("    .id        = ").append(Integer.toHexString(sid))
153              .append("\n");
154          buffer.append("[/UNKNWON RECORD]\n");
155          return buffer.toString();
156      }
157  
158      public short getSid()
159      {
160          return this.sid;
161      }
162  
163      /**
164       * called by the constructor, should set class level fields.  Should throw
165       * runtime exception for bad/icomplete data.
166       *
167       * @param data raw data
168       * @param size size of data
169       * @param offset of the records data (provided a big array of the file)
170       */
171  
172      protected void fillFields(byte [] data, short size, int offset)
173      {
174          throw new RecordFormatException(
175              "Unknown record cannot be constructed via offset -- we need a copy of the data");
176      }
177  }
178