1 /*
2 * Copyright 1996-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.io;
27
28 import java.io.ObjectStreamClass.WeakClassKey;
29 import java.lang.ref.ReferenceQueue;
30 import java.lang.reflect.Array;
31 import java.lang.reflect.Modifier;
32 import java.lang.reflect.Proxy;
33 import java.security.AccessControlContext;
34 import java.security.AccessController;
35 import java.security.PrivilegedAction;
36 import java.security.PrivilegedActionException;
37 import java.security.PrivilegedExceptionAction;
38 import java.util.Arrays;
39 import java.util.HashMap;
40 import java.util.concurrent.ConcurrentHashMap;
41 import java.util.concurrent.ConcurrentMap;
42 import java.util.concurrent.atomic.AtomicBoolean;
43 import static java.io.ObjectStreamClass.processQueue;
44
45 /**
46 * An ObjectInputStream deserializes primitive data and objects previously
47 * written using an ObjectOutputStream.
48 *
49 * <p>ObjectOutputStream and ObjectInputStream can provide an application with
50 * persistent storage for graphs of objects when used with a FileOutputStream
51 * and FileInputStream respectively. ObjectInputStream is used to recover
52 * those objects previously serialized. Other uses include passing objects
53 * between hosts using a socket stream or for marshaling and unmarshaling
54 * arguments and parameters in a remote communication system.
55 *
56 * <p>ObjectInputStream ensures that the types of all objects in the graph
57 * created from the stream match the classes present in the Java Virtual
58 * Machine. Classes are loaded as required using the standard mechanisms.
59 *
60 * <p>Only objects that support the java.io.Serializable or
61 * java.io.Externalizable interface can be read from streams.
62 *
63 * <p>The method <code>readObject</code> is used to read an object from the
64 * stream. Java's safe casting should be used to get the desired type. In
65 * Java, strings and arrays are objects and are treated as objects during
66 * serialization. When read they need to be cast to the expected type.
67 *
68 * <p>Primitive data types can be read from the stream using the appropriate
69 * method on DataInput.
70 *
71 * <p>The default deserialization mechanism for objects restores the contents
72 * of each field to the value and type it had when it was written. Fields
73 * declared as transient or static are ignored by the deserialization process.
74 * References to other objects cause those objects to be read from the stream
75 * as necessary. Graphs of objects are restored correctly using a reference
76 * sharing mechanism. New objects are always allocated when deserializing,
77 * which prevents existing objects from being overwritten.
78 *
79 * <p>Reading an object is analogous to running the constructors of a new
80 * object. Memory is allocated for the object and initialized to zero (NULL).
81 * No-arg constructors are invoked for the non-serializable classes and then
82 * the fields of the serializable classes are restored from the stream starting
83 * with the serializable class closest to java.lang.object and finishing with
84 * the object's most specific class.
85 *
86 * <p>For example to read from a stream as written by the example in
87 * ObjectOutputStream:
88 * <br>
89 * <pre>
90 * FileInputStream fis = new FileInputStream("t.tmp");
91 * ObjectInputStream ois = new ObjectInputStream(fis);
92 *
93 * int i = ois.readInt();
94 * String today = (String) ois.readObject();
95 * Date date = (Date) ois.readObject();
96 *
97 * ois.close();
98 * </pre>
99 *
100 * <p>Classes control how they are serialized by implementing either the
101 * java.io.Serializable or java.io.Externalizable interfaces.
102 *
103 * <p>Implementing the Serializable interface allows object serialization to
104 * save and restore the entire state of the object and it allows classes to
105 * evolve between the time the stream is written and the time it is read. It
106 * automatically traverses references between objects, saving and restoring
107 * entire graphs.
108 *
109 * <p>Serializable classes that require special handling during the
110 * serialization and deserialization process should implement the following
111 * methods:<p>
112 *
113 * <pre>
114 * private void writeObject(java.io.ObjectOutputStream stream)
115 * throws IOException;
116 * private void readObject(java.io.ObjectInputStream stream)
117 * throws IOException, ClassNotFoundException;
118 * private void readObjectNoData()
119 * throws ObjectStreamException;
120 * </pre>
121 *
122 * <p>The readObject method is responsible for reading and restoring the state
123 * of the object for its particular class using data written to the stream by
124 * the corresponding writeObject method. The method does not need to concern
125 * itself with the state belonging to its superclasses or subclasses. State is
126 * restored by reading data from the ObjectInputStream for the individual
127 * fields and making assignments to the appropriate fields of the object.
128 * Reading primitive data types is supported by DataInput.
129 *
130 * <p>Any attempt to read object data which exceeds the boundaries of the
131 * custom data written by the corresponding writeObject method will cause an
132 * OptionalDataException to be thrown with an eof field value of true.
133 * Non-object reads which exceed the end of the allotted data will reflect the
134 * end of data in the same way that they would indicate the end of the stream:
135 * bytewise reads will return -1 as the byte read or number of bytes read, and
136 * primitive reads will throw EOFExceptions. If there is no corresponding
137 * writeObject method, then the end of default serialized data marks the end of
138 * the allotted data.
139 *
140 * <p>Primitive and object read calls issued from within a readExternal method
141 * behave in the same manner--if the stream is already positioned at the end of
142 * data written by the corresponding writeExternal method, object reads will
143 * throw OptionalDataExceptions with eof set to true, bytewise reads will
144 * return -1, and primitive reads will throw EOFExceptions. Note that this
145 * behavior does not hold for streams written with the old
146 * <code>ObjectStreamConstants.PROTOCOL_VERSION_1</code> protocol, in which the
147 * end of data written by writeExternal methods is not demarcated, and hence
148 * cannot be detected.
149 *
150 * <p>The readObjectNoData method is responsible for initializing the state of
151 * the object for its particular class in the event that the serialization
152 * stream does not list the given class as a superclass of the object being
153 * deserialized. This may occur in cases where the receiving party uses a
154 * different version of the deserialized instance's class than the sending
155 * party, and the receiver's version extends classes that are not extended by
156 * the sender's version. This may also occur if the serialization stream has
157 * been tampered; hence, readObjectNoData is useful for initializing
158 * deserialized objects properly despite a "hostile" or incomplete source
159 * stream.
160 *
161 * <p>Serialization does not read or assign values to the fields of any object
162 * that does not implement the java.io.Serializable interface. Subclasses of
163 * Objects that are not serializable can be serializable. In this case the
164 * non-serializable class must have a no-arg constructor to allow its fields to
165 * be initialized. In this case it is the responsibility of the subclass to
166 * save and restore the state of the non-serializable class. It is frequently
167 * the case that the fields of that class are accessible (public, package, or
168 * protected) or that there are get and set methods that can be used to restore
169 * the state.
170 *
171 * <p>Any exception that occurs while deserializing an object will be caught by
172 * the ObjectInputStream and abort the reading process.
173 *
174 * <p>Implementing the Externalizable interface allows the object to assume
175 * complete control over the contents and format of the object's serialized
176 * form. The methods of the Externalizable interface, writeExternal and
177 * readExternal, are called to save and restore the objects state. When
178 * implemented by a class they can write and read their own state using all of
179 * the methods of ObjectOutput and ObjectInput. It is the responsibility of
180 * the objects to handle any versioning that occurs.
181 *
182 * <p>Enum constants are deserialized differently than ordinary serializable or
183 * externalizable objects. The serialized form of an enum constant consists
184 * solely of its name; field values of the constant are not transmitted. To
185 * deserialize an enum constant, ObjectInputStream reads the constant name from
186 * the stream; the deserialized constant is then obtained by calling the static
187 * method <code>Enum.valueOf(Class, String)</code> with the enum constant's
188 * base type and the received constant name as arguments. Like other
189 * serializable or externalizable objects, enum constants can function as the
190 * targets of back references appearing subsequently in the serialization
191 * stream. The process by which enum constants are deserialized cannot be
192 * customized: any class-specific readObject, readObjectNoData, and readResolve
193 * methods defined by enum types are ignored during deserialization.
194 * Similarly, any serialPersistentFields or serialVersionUID field declarations
195 * are also ignored--all enum types have a fixed serialVersionUID of 0L.
196 *
197 * @author Mike Warres
198 * @author Roger Riggs
199 * @see java.io.DataInput
200 * @see java.io.ObjectOutputStream
201 * @see java.io.Serializable
202 * @see <a href="../../../platform/serialization/spec/input.html"> Object Serialization Specification, Section 3, Object Input Classes</a>
203 * @since JDK1.1
204 */
205 public class ObjectInputStream
206 extends InputStream implements ObjectInput, ObjectStreamConstants
207 {
208 /** handle value representing null */
209 private static final int NULL_HANDLE = -1;
210
211 /** marker for unshared objects in internal handle table */
212 private static final Object unsharedMarker = new Object();
213
214 /** table mapping primitive type names to corresponding class objects */
215 private static final HashMap<String, Class<?>> primClasses
216 = new HashMap<String, Class<?>>(8, 1.0F);
217 static {
218 primClasses.put("boolean", boolean.class);
219 primClasses.put("byte", byte.class);
220 primClasses.put("char", char.class);
221 primClasses.put("short", short.class);
222 primClasses.put("int", int.class);
223 primClasses.put("long", long.class);
224 primClasses.put("float", float.class);
225 primClasses.put("double", double.class);
226 primClasses.put("void", void.class);
227 }
228
229 private static class Caches {
230 /** cache of subclass security audit results */
231 static final ConcurrentMap<WeakClassKey,Boolean> subclassAudits =
232 new ConcurrentHashMap<WeakClassKey,Boolean>();
233
234 /** queue for WeakReferences to audited subclasses */
235 static final ReferenceQueue<Class<?>> subclassAuditsQueue =
236 new ReferenceQueue<Class<?>>();
237 }
238
239 /** filter stream for handling block data conversion */
240 private final BlockDataInputStream bin;
241 /** validation callback list */
242 private final ValidationList vlist;
243 /** recursion depth */
244 private int depth;
245 /** whether stream is closed */
246 private boolean closed;
247
248 /** wire handle -> obj/exception map */
249 private final HandleTable handles;
250 /** scratch field for passing handle values up/down call stack */
251 private int passHandle = NULL_HANDLE;
252 /** flag set when at end of field value block with no TC_ENDBLOCKDATA */
253 private boolean defaultDataEnd = false;
254
255 /** buffer for reading primitive field values */
256 private byte[] primVals;
257
258 /** if true, invoke readObjectOverride() instead of readObject() */
259 private final boolean enableOverride;
260 /** if true, invoke resolveObject() */
261 private boolean enableResolve;
262
263 /**
264 * Context during upcalls to class-defined readObject methods; holds
265 * object currently being deserialized and descriptor for current class.
266 * Null when not during readObject upcall.
267 */
268 private CallbackContext curContext;
269
270 /**
271 * Creates an ObjectInputStream that reads from the specified InputStream.
272 * A serialization stream header is read from the stream and verified.
273 * This constructor will block until the corresponding ObjectOutputStream
274 * has written and flushed the header.
275 *
276 * <p>If a security manager is installed, this constructor will check for
277 * the "enableSubclassImplementation" SerializablePermission when invoked
278 * directly or indirectly by the constructor of a subclass which overrides
279 * the ObjectInputStream.readFields or ObjectInputStream.readUnshared
280 * methods.
281 *
282 * @param in input stream to read from
283 * @throws StreamCorruptedException if the stream header is incorrect
284 * @throws IOException if an I/O error occurs while reading stream header
285 * @throws SecurityException if untrusted subclass illegally overrides
286 * security-sensitive methods
287 * @throws NullPointerException if <code>in</code> is <code>null</code>
288 * @see ObjectInputStream#ObjectInputStream()
289 * @see ObjectInputStream#readFields()
290 * @see ObjectOutputStream#ObjectOutputStream(OutputStream)
291 */
292 public ObjectInputStream(InputStream in) throws IOException {
293 verifySubclass();
294 bin = new BlockDataInputStream(in);
295 handles = new HandleTable(10);
296 vlist = new ValidationList();
297 enableOverride = false;
298 readStreamHeader();
299 bin.setBlockDataMode(true);
300 }
301
302 /**
303 * Provide a way for subclasses that are completely reimplementing
304 * ObjectInputStream to not have to allocate private data just used by this
305 * implementation of ObjectInputStream.
306 *
307 * <p>If there is a security manager installed, this method first calls the
308 * security manager's <code>checkPermission</code> method with the
309 * <code>SerializablePermission("enableSubclassImplementation")</code>
310 * permission to ensure it's ok to enable subclassing.
311 *
312 * @throws SecurityException if a security manager exists and its
313 * <code>checkPermission</code> method denies enabling
314 * subclassing.
315 * @see SecurityManager#checkPermission
316 * @see java.io.SerializablePermission
317 */
318 protected ObjectInputStream() throws IOException, SecurityException {
319 SecurityManager sm = System.getSecurityManager();
320 if (sm != null) {
321 sm.checkPermission(SUBCLASS_IMPLEMENTATION_PERMISSION);
322 }
323 bin = null;
324 handles = null;
325 vlist = null;
326 enableOverride = true;
327 }
328
329 /**
330 * Read an object from the ObjectInputStream. The class of the object, the
331 * signature of the class, and the values of the non-transient and
332 * non-static fields of the class and all of its supertypes are read.
333 * Default deserializing for a class can be overriden using the writeObject
334 * and readObject methods. Objects referenced by this object are read
335 * transitively so that a complete equivalent graph of objects is
336 * reconstructed by readObject.
337 *
338 * <p>The root object is completely restored when all of its fields and the
339 * objects it references are completely restored. At this point the object
340 * validation callbacks are executed in order based on their registered
341 * priorities. The callbacks are registered by objects (in the readObject
342 * special methods) as they are individually restored.
343 *
344 * <p>Exceptions are thrown for problems with the InputStream and for
345 * classes that should not be deserialized. All exceptions are fatal to
346 * the InputStream and leave it in an indeterminate state; it is up to the
347 * caller to ignore or recover the stream state.
348 *
349 * @throws ClassNotFoundException Class of a serialized object cannot be
350 * found.
351 * @throws InvalidClassException Something is wrong with a class used by
352 * serialization.
353 * @throws StreamCorruptedException Control information in the
354 * stream is inconsistent.
355 * @throws OptionalDataException Primitive data was found in the
356 * stream instead of objects.
357 * @throws IOException Any of the usual Input/Output related exceptions.
358 */
359 public final Object readObject()
360 throws IOException, ClassNotFoundException
361 {
362 if (enableOverride) {
363 return readObjectOverride();
364 }
365
366 // if nested read, passHandle contains handle of enclosing object
367 int outerHandle = passHandle;
368 try {
369 Object obj = readObject0(false);
370 handles.markDependency(outerHandle, passHandle);
371 ClassNotFoundException ex = handles.lookupException(passHandle);
372 if (ex != null) {
373 throw ex;
374 }
375 if (depth == 0) {
376 vlist.doCallbacks();
377 }
378 return obj;
379 } finally {
380 passHandle = outerHandle;
381 if (closed && depth == 0) {
382 clear();
383 }
384 }
385 }
386
387 /**
388 * This method is called by trusted subclasses of ObjectOutputStream that
389 * constructed ObjectOutputStream using the protected no-arg constructor.
390 * The subclass is expected to provide an override method with the modifier
391 * "final".
392 *
393 * @return the Object read from the stream.
394 * @throws ClassNotFoundException Class definition of a serialized object
395 * cannot be found.
396 * @throws OptionalDataException Primitive data was found in the stream
397 * instead of objects.
398 * @throws IOException if I/O errors occurred while reading from the
399 * underlying stream
400 * @see #ObjectInputStream()
401 * @see #readObject()
402 * @since 1.2
403 */
404 protected Object readObjectOverride()
405 throws IOException, ClassNotFoundException
406 {
407 return null;
408 }
409
410 /**
411 * Reads an "unshared" object from the ObjectInputStream. This method is
412 * identical to readObject, except that it prevents subsequent calls to
413 * readObject and readUnshared from returning additional references to the
414 * deserialized instance obtained via this call. Specifically:
415 * <ul>
416 * <li>If readUnshared is called to deserialize a back-reference (the
417 * stream representation of an object which has been written
418 * previously to the stream), an ObjectStreamException will be
419 * thrown.
420 *
421 * <li>If readUnshared returns successfully, then any subsequent attempts
422 * to deserialize back-references to the stream handle deserialized
423 * by readUnshared will cause an ObjectStreamException to be thrown.
424 * </ul>
425 * Deserializing an object via readUnshared invalidates the stream handle
426 * associated with the returned object. Note that this in itself does not
427 * always guarantee that the reference returned by readUnshared is unique;
428 * the deserialized object may define a readResolve method which returns an
429 * object visible to other parties, or readUnshared may return a Class
430 * object or enum constant obtainable elsewhere in the stream or through
431 * external means. If the deserialized object defines a readResolve method
432 * and the invocation of that method returns an array, then readUnshared
433 * returns a shallow clone of that array; this guarantees that the returned
434 * array object is unique and cannot be obtained a second time from an
435 * invocation of readObject or readUnshared on the ObjectInputStream,
436 * even if the underlying data stream has been manipulated.
437 *
438 * <p>ObjectInputStream subclasses which override this method can only be
439 * constructed in security contexts possessing the
440 * "enableSubclassImplementation" SerializablePermission; any attempt to
441 * instantiate such a subclass without this permission will cause a
442 * SecurityException to be thrown.
443 *
444 * @return reference to deserialized object
445 * @throws ClassNotFoundException if class of an object to deserialize
446 * cannot be found
447 * @throws StreamCorruptedException if control information in the stream
448 * is inconsistent
449 * @throws ObjectStreamException if object to deserialize has already
450 * appeared in stream
451 * @throws OptionalDataException if primitive data is next in stream
452 * @throws IOException if an I/O error occurs during deserialization
453 * @since 1.4
454 */
455 public Object readUnshared() throws IOException, ClassNotFoundException {
456 // if nested read, passHandle contains handle of enclosing object
457 int outerHandle = passHandle;
458 try {
459 Object obj = readObject0(true);
460 handles.markDependency(outerHandle, passHandle);
461 ClassNotFoundException ex = handles.lookupException(passHandle);
462 if (ex != null) {
463 throw ex;
464 }
465 if (depth == 0) {
466 vlist.doCallbacks();
467 }
468 return obj;
469 } finally {
470 passHandle = outerHandle;
471 if (closed && depth == 0) {
472 clear();
473 }
474 }
475 }
476
477 /**
478 * Read the non-static and non-transient fields of the current class from
479 * this stream. This may only be called from the readObject method of the
480 * class being deserialized. It will throw the NotActiveException if it is
481 * called otherwise.
482 *
483 * @throws ClassNotFoundException if the class of a serialized object
484 * could not be found.
485 * @throws IOException if an I/O error occurs.
486 * @throws NotActiveException if the stream is not currently reading
487 * objects.
488 */
489 public void defaultReadObject()
490 throws IOException, ClassNotFoundException
491 {
492 if (curContext == null) {
493 throw new NotActiveException("not in call to readObject");
494 }
495 Object curObj = curContext.getObj();
496 ObjectStreamClass curDesc = curContext.getDesc();
497 bin.setBlockDataMode(false);
498 defaultReadFields(curObj, curDesc);
499 bin.setBlockDataMode(true);
500 if (!curDesc.hasWriteObjectData()) {
501 /*
502 * Fix for 4360508: since stream does not contain terminating
503 * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere
504 * knows to simulate end-of-custom-data behavior.
505 */
506 defaultDataEnd = true;
507 }
508 ClassNotFoundException ex = handles.lookupException(passHandle);
509 if (ex != null) {
510 throw ex;
511 }
512 }
513
514 /**
515 * Reads the persistent fields from the stream and makes them available by
516 * name.
517 *
518 * @return the <code>GetField</code> object representing the persistent
519 * fields of the object being deserialized
520 * @throws ClassNotFoundException if the class of a serialized object
521 * could not be found.
522 * @throws IOException if an I/O error occurs.
523 * @throws NotActiveException if the stream is not currently reading
524 * objects.
525 * @since 1.2
526 */
527 public ObjectInputStream.GetField readFields()
528 throws IOException, ClassNotFoundException
529 {
530 if (curContext == null) {
531 throw new NotActiveException("not in call to readObject");
532 }
533 Object curObj = curContext.getObj();
534 ObjectStreamClass curDesc = curContext.getDesc();
535 bin.setBlockDataMode(false);
536 GetFieldImpl getField = new GetFieldImpl(curDesc);
537 getField.readFields();
538 bin.setBlockDataMode(true);
539 if (!curDesc.hasWriteObjectData()) {
540 /*
541 * Fix for 4360508: since stream does not contain terminating
542 * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere
543 * knows to simulate end-of-custom-data behavior.
544 */
545 defaultDataEnd = true;
546 }
547
548 return getField;
549 }
550
551 /**
552 * Register an object to be validated before the graph is returned. While
553 * similar to resolveObject these validations are called after the entire
554 * graph has been reconstituted. Typically, a readObject method will
555 * register the object with the stream so that when all of the objects are
556 * restored a final set of validations can be performed.
557 *
558 * @param obj the object to receive the validation callback.
559 * @param prio controls the order of callbacks;zero is a good default.
560 * Use higher numbers to be called back earlier, lower numbers for
561 * later callbacks. Within a priority, callbacks are processed in
562 * no particular order.
563 * @throws NotActiveException The stream is not currently reading objects
564 * so it is invalid to register a callback.
565 * @throws InvalidObjectException The validation object is null.
566 */
567 public void registerValidation(ObjectInputValidation obj, int prio)
568 throws NotActiveException, InvalidObjectException
569 {
570 if (depth == 0) {
571 throw new NotActiveException("stream inactive");
572 }
573 vlist.register(obj, prio);
574 }
575
576 /**
577 * Load the local class equivalent of the specified stream class
578 * description. Subclasses may implement this method to allow classes to
579 * be fetched from an alternate source.
580 *
581 * <p>The corresponding method in <code>ObjectOutputStream</code> is
582 * <code>annotateClass</code>. This method will be invoked only once for
583 * each unique class in the stream. This method can be implemented by
584 * subclasses to use an alternate loading mechanism but must return a
585 * <code>Class</code> object. Once returned, if the class is not an array
586 * class, its serialVersionUID is compared to the serialVersionUID of the
587 * serialized class, and if there is a mismatch, the deserialization fails
588 * and an {@link InvalidClassException} is thrown.
589 *
590 * <p>The default implementation of this method in
591 * <code>ObjectInputStream</code> returns the result of calling
592 * <pre>
593 * Class.forName(desc.getName(), false, loader)
594 * </pre>
595 * where <code>loader</code> is determined as follows: if there is a
596 * method on the current thread's stack whose declaring class was
597 * defined by a user-defined class loader (and was not a generated to
598 * implement reflective invocations), then <code>loader</code> is class
599 * loader corresponding to the closest such method to the currently
600 * executing frame; otherwise, <code>loader</code> is
601 * <code>null</code>. If this call results in a
602 * <code>ClassNotFoundException</code> and the name of the passed
603 * <code>ObjectStreamClass</code> instance is the Java language keyword
604 * for a primitive type or void, then the <code>Class</code> object
605 * representing that primitive type or void will be returned
606 * (e.g., an <code>ObjectStreamClass</code> with the name
607 * <code>"int"</code> will be resolved to <code>Integer.TYPE</code>).
608 * Otherwise, the <code>ClassNotFoundException</code> will be thrown to
609 * the caller of this method.
610 *
611 * @param desc an instance of class <code>ObjectStreamClass</code>
612 * @return a <code>Class</code> object corresponding to <code>desc</code>
613 * @throws IOException any of the usual Input/Output exceptions.
614 * @throws ClassNotFoundException if class of a serialized object cannot
615 * be found.
616 */
617 protected Class<?> resolveClass(ObjectStreamClass desc)
618 throws IOException, ClassNotFoundException
619 {
620 String name = desc.getName();
621 try {
622 return Class.forName(name, false, latestUserDefinedLoader());
623 } catch (ClassNotFoundException ex) {
624 Class<?> cl = primClasses.get(name);
625 if (cl != null) {
626 return cl;
627 } else {
628 throw ex;
629 }
630 }
631 }
632
633 /**
634 * Returns a proxy class that implements the interfaces named in a proxy
635 * class descriptor; subclasses may implement this method to read custom
636 * data from the stream along with the descriptors for dynamic proxy
637 * classes, allowing them to use an alternate loading mechanism for the
638 * interfaces and the proxy class.
639 *
640 * <p>This method is called exactly once for each unique proxy class
641 * descriptor in the stream.
642 *
643 * <p>The corresponding method in <code>ObjectOutputStream</code> is
644 * <code>annotateProxyClass</code>. For a given subclass of
645 * <code>ObjectInputStream</code> that overrides this method, the
646 * <code>annotateProxyClass</code> method in the corresponding subclass of
647 * <code>ObjectOutputStream</code> must write any data or objects read by
648 * this method.
649 *
650 * <p>The default implementation of this method in
651 * <code>ObjectInputStream</code> returns the result of calling
652 * <code>Proxy.getProxyClass</code> with the list of <code>Class</code>
653 * objects for the interfaces that are named in the <code>interfaces</code>
654 * parameter. The <code>Class</code> object for each interface name
655 * <code>i</code> is the value returned by calling
656 * <pre>
657 * Class.forName(i, false, loader)
658 * </pre>
659 * where <code>loader</code> is that of the first non-<code>null</code>
660 * class loader up the execution stack, or <code>null</code> if no
661 * non-<code>null</code> class loaders are on the stack (the same class
662 * loader choice used by the <code>resolveClass</code> method). Unless any
663 * of the resolved interfaces are non-public, this same value of
664 * <code>loader</code> is also the class loader passed to
665 * <code>Proxy.getProxyClass</code>; if non-public interfaces are present,
666 * their class loader is passed instead (if more than one non-public
667 * interface class loader is encountered, an
668 * <code>IllegalAccessError</code> is thrown).
669 * If <code>Proxy.getProxyClass</code> throws an
670 * <code>IllegalArgumentException</code>, <code>resolveProxyClass</code>
671 * will throw a <code>ClassNotFoundException</code> containing the
672 * <code>IllegalArgumentException</code>.
673 *
674 * @param interfaces the list of interface names that were
675 * deserialized in the proxy class descriptor
676 * @return a proxy class for the specified interfaces
677 * @throws IOException any exception thrown by the underlying
678 * <code>InputStream</code>
679 * @throws ClassNotFoundException if the proxy class or any of the
680 * named interfaces could not be found
681 * @see ObjectOutputStream#annotateProxyClass(Class)
682 * @since 1.3
683 */
684 protected Class<?> resolveProxyClass(String[] interfaces)
685 throws IOException, ClassNotFoundException
686 {
687 ClassLoader latestLoader = latestUserDefinedLoader();
688 ClassLoader nonPublicLoader = null;
689 boolean hasNonPublicInterface = false;
690
691 // define proxy in class loader of non-public interface(s), if any
692 Class[] classObjs = new Class[interfaces.length];
693 for (int i = 0; i < interfaces.length; i++) {
694 Class cl = Class.forName(interfaces[i], false, latestLoader);
695 if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
696 if (hasNonPublicInterface) {
697 if (nonPublicLoader != cl.getClassLoader()) {
698 throw new IllegalAccessError(
699 "conflicting non-public interface class loaders");
700 }
701 } else {
702 nonPublicLoader = cl.getClassLoader();
703 hasNonPublicInterface = true;
704 }
705 }
706 classObjs[i] = cl;
707 }
708 try {
709 return Proxy.getProxyClass(
710 hasNonPublicInterface ? nonPublicLoader : latestLoader,
711 classObjs);
712 } catch (IllegalArgumentException e) {
713 throw new ClassNotFoundException(null, e);
714 }
715 }
716
717 /**
718 * This method will allow trusted subclasses of ObjectInputStream to
719 * substitute one object for another during deserialization. Replacing
720 * objects is disabled until enableResolveObject is called. The
721 * enableResolveObject method checks that the stream requesting to resolve
722 * object can be trusted. Every reference to serializable objects is passed
723 * to resolveObject. To insure that the private state of objects is not
724 * unintentionally exposed only trusted streams may use resolveObject.
725 *
726 * <p>This method is called after an object has been read but before it is
727 * returned from readObject. The default resolveObject method just returns
728 * the same object.
729 *
730 * <p>When a subclass is replacing objects it must insure that the
731 * substituted object is compatible with every field where the reference
732 * will be stored. Objects whose type is not a subclass of the type of the
733 * field or array element abort the serialization by raising an exception
734 * and the object is not be stored.
735 *
736 * <p>This method is called only once when each object is first
737 * encountered. All subsequent references to the object will be redirected
738 * to the new object.
739 *
740 * @param obj object to be substituted
741 * @return the substituted object
742 * @throws IOException Any of the usual Input/Output exceptions.
743 */
744 protected Object resolveObject(Object obj) throws IOException {
745 return obj;
746 }
747
748 /**
749 * Enable the stream to allow objects read from the stream to be replaced.
750 * When enabled, the resolveObject method is called for every object being
751 * deserialized.
752 *
753 * <p>If <i>enable</i> is true, and there is a security manager installed,
754 * this method first calls the security manager's
755 * <code>checkPermission</code> method with the
756 * <code>SerializablePermission("enableSubstitution")</code> permission to
757 * ensure it's ok to enable the stream to allow objects read from the
758 * stream to be replaced.
759 *
760 * @param enable true for enabling use of <code>resolveObject</code> for
761 * every object being deserialized
762 * @return the previous setting before this method was invoked
763 * @throws SecurityException if a security manager exists and its
764 * <code>checkPermission</code> method denies enabling the stream
765 * to allow objects read from the stream to be replaced.
766 * @see SecurityManager#checkPermission
767 * @see java.io.SerializablePermission
768 */
769 protected boolean enableResolveObject(boolean enable)
770 throws SecurityException
771 {
772 if (enable == enableResolve) {
773 return enable;
774 }
775 if (enable) {
776 SecurityManager sm = System.getSecurityManager();
777 if (sm != null) {
778 sm.checkPermission(SUBSTITUTION_PERMISSION);
779 }
780 }
781 enableResolve = enable;
782 return !enableResolve;
783 }
784
785 /**
786 * The readStreamHeader method is provided to allow subclasses to read and
787 * verify their own stream headers. It reads and verifies the magic number
788 * and version number.
789 *
790 * @throws IOException if there are I/O errors while reading from the
791 * underlying <code>InputStream</code>
792 * @throws StreamCorruptedException if control information in the stream
793 * is inconsistent
794 */
795 protected void readStreamHeader()
796 throws IOException, StreamCorruptedException
797 {
798 short s0 = bin.readShort();
799 short s1 = bin.readShort();
800 if (s0 != STREAM_MAGIC || s1 != STREAM_VERSION) {
801 throw new StreamCorruptedException(
802 String.format("invalid stream header: %04X%04X", s0, s1));
803 }
804 }
805
806 /**
807 * Read a class descriptor from the serialization stream. This method is
808 * called when the ObjectInputStream expects a class descriptor as the next
809 * item in the serialization stream. Subclasses of ObjectInputStream may
810 * override this method to read in class descriptors that have been written
811 * in non-standard formats (by subclasses of ObjectOutputStream which have
812 * overridden the <code>writeClassDescriptor</code> method). By default,
813 * this method reads class descriptors according to the format defined in
814 * the Object Serialization specification.
815 *
816 * @return the class descriptor read
817 * @throws IOException If an I/O error has occurred.
818 * @throws ClassNotFoundException If the Class of a serialized object used
819 * in the class descriptor representation cannot be found
820 * @see java.io.ObjectOutputStream#writeClassDescriptor(java.io.ObjectStreamClass)
821 * @since 1.3
822 */
823 protected ObjectStreamClass readClassDescriptor()
824 throws IOException, ClassNotFoundException
825 {
826 ObjectStreamClass desc = new ObjectStreamClass();
827 desc.readNonProxy(this);
828 return desc;
829 }
830
831 /**
832 * Reads a byte of data. This method will block if no input is available.
833 *
834 * @return the byte read, or -1 if the end of the stream is reached.
835 * @throws IOException If an I/O error has occurred.
836 */
837 public int read() throws IOException {
838 return bin.read();
839 }
840
841 /**
842 * Reads into an array of bytes. This method will block until some input
843 * is available. Consider using java.io.DataInputStream.readFully to read
844 * exactly 'length' bytes.
845 *
846 * @param buf the buffer into which the data is read
847 * @param off the start offset of the data
848 * @param len the maximum number of bytes read
849 * @return the actual number of bytes read, -1 is returned when the end of
850 * the stream is reached.
851 * @throws IOException If an I/O error has occurred.
852 * @see java.io.DataInputStream#readFully(byte[],int,int)
853 */
854 public int read(byte[] buf, int off, int len) throws IOException {
855 if (buf == null) {
856 throw new NullPointerException();
857 }
858 int endoff = off + len;
859 if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) {
860 throw new IndexOutOfBoundsException();
861 }
862 return bin.read(buf, off, len, false);
863 }
864
865 /**
866 * Returns the number of bytes that can be read without blocking.
867 *
868 * @return the number of available bytes.
869 * @throws IOException if there are I/O errors while reading from the
870 * underlying <code>InputStream</code>
871 */
872 public int available() throws IOException {
873 return bin.available();
874 }
875
876 /**
877 * Closes the input stream. Must be called to release any resources
878 * associated with the stream.
879 *
880 * @throws IOException If an I/O error has occurred.
881 */
882 public void close() throws IOException {
883 /*
884 * Even if stream already closed, propagate redundant close to
885 * underlying stream to stay consistent with previous implementations.
886 */
887 closed = true;
888 if (depth == 0) {
889 clear();
890 }
891 bin.close();
892 }
893
894 /**
895 * Reads in a boolean.
896 *
897 * @return the boolean read.
898 * @throws EOFException If end of file is reached.
899 * @throws IOException If other I/O error has occurred.
900 */
901 public boolean readBoolean() throws IOException {
902 return bin.readBoolean();
903 }
904
905 /**
906 * Reads an 8 bit byte.
907 *
908 * @return the 8 bit byte read.
909 * @throws EOFException If end of file is reached.
910 * @throws IOException If other I/O error has occurred.
911 */
912 public byte readByte() throws IOException {
913 return bin.readByte();
914 }
915
916 /**
917 * Reads an unsigned 8 bit byte.
918 *
919 * @return the 8 bit byte read.
920 * @throws EOFException If end of file is reached.
921 * @throws IOException If other I/O error has occurred.
922 */
923 public int readUnsignedByte() throws IOException {
924 return bin.readUnsignedByte();
925 }
926
927 /**
928 * Reads a 16 bit char.
929 *
930 * @return the 16 bit char read.
931 * @throws EOFException If end of file is reached.
932 * @throws IOException If other I/O error has occurred.
933 */
934 public char readChar() throws IOException {
935 return bin.readChar();
936 }
937
938 /**
939 * Reads a 16 bit short.
940 *
941 * @return the 16 bit short read.
942 * @throws EOFException If end of file is reached.
943 * @throws IOException If other I/O error has occurred.
944 */
945 public short readShort() throws IOException {
946 return bin.readShort();
947 }
948
949 /**
950 * Reads an unsigned 16 bit short.
951 *
952 * @return the 16 bit short read.
953 * @throws EOFException If end of file is reached.
954 * @throws IOException If other I/O error has occurred.
955 */
956 public int readUnsignedShort() throws IOException {
957 return bin.readUnsignedShort();
958 }
959
960 /**
961 * Reads a 32 bit int.
962 *
963 * @return the 32 bit integer read.
964 * @throws EOFException If end of file is reached.
965 * @throws IOException If other I/O error has occurred.
966 */
967 public int readInt() throws IOException {
968 return bin.readInt();
969 }
970
971 /**
972 * Reads a 64 bit long.
973 *
974 * @return the read 64 bit long.
975 * @throws EOFException If end of file is reached.
976 * @throws IOException If other I/O error has occurred.
977 */
978 public long readLong() throws IOException {
979 return bin.readLong();
980 }
981
982 /**
983 * Reads a 32 bit float.
984 *
985 * @return the 32 bit float read.
986 * @throws EOFException If end of file is reached.
987 * @throws IOException If other I/O error has occurred.
988 */
989 public float readFloat() throws IOException {
990 return bin.readFloat();
991 }
992
993 /**
994 * Reads a 64 bit double.
995 *
996 * @return the 64 bit double read.
997 * @throws EOFException If end of file is reached.
998 * @throws IOException If other I/O error has occurred.
999 */
1000 public double readDouble() throws IOException {
1001 return bin.readDouble();
1002 }
1003
1004 /**
1005 * Reads bytes, blocking until all bytes are read.
1006 *
1007 * @param buf the buffer into which the data is read
1008 * @throws EOFException If end of file is reached.
1009 * @throws IOException If other I/O error has occurred.
1010 */
1011 public void readFully(byte[] buf) throws IOException {
1012 bin.readFully(buf, 0, buf.length, false);
1013 }
1014
1015 /**
1016 * Reads bytes, blocking until all bytes are read.
1017 *
1018 * @param buf the buffer into which the data is read
1019 * @param off the start offset of the data
1020 * @param len the maximum number of bytes to read
1021 * @throws EOFException If end of file is reached.
1022 * @throws IOException If other I/O error has occurred.
1023 */
1024 public void readFully(byte[] buf, int off, int len) throws IOException {
1025 int endoff = off + len;
1026 if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) {
1027 throw new IndexOutOfBoundsException();
1028 }
1029 bin.readFully(buf, off, len, false);
1030 }
1031
1032 /**
1033 * Skips bytes.
1034 *
1035 * @param len the number of bytes to be skipped
1036 * @return the actual number of bytes skipped.
1037 * @throws IOException If an I/O error has occurred.
1038 */
1039 public int skipBytes(int len) throws IOException {
1040 return bin.skipBytes(len);
1041 }
1042
1043 /**
1044 * Reads in a line that has been terminated by a \n, \r, \r\n or EOF.
1045 *
1046 * @return a String copy of the line.
1047 * @throws IOException if there are I/O errors while reading from the
1048 * underlying <code>InputStream</code>
1049 * @deprecated This method does not properly convert bytes to characters.
1050 * see DataInputStream for the details and alternatives.
1051 */
1052 @Deprecated
1053 public String readLine() throws IOException {
1054 return bin.readLine();
1055 }
1056
1057 /**
1058 * Reads a String in
1059 * <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
1060 * format.
1061 *
1062 * @return the String.
1063 * @throws IOException if there are I/O errors while reading from the
1064 * underlying <code>InputStream</code>
1065 * @throws UTFDataFormatException if read bytes do not represent a valid
1066 * modified UTF-8 encoding of a string
1067 */
1068 public String readUTF() throws IOException {
1069 return bin.readUTF();
1070 }
1071
1072 /**
1073 * Provide access to the persistent fields read from the input stream.
1074 */
1075 public static abstract class GetField {
1076
1077 /**
1078 * Get the ObjectStreamClass that describes the fields in the stream.
1079 *
1080 * @return the descriptor class that describes the serializable fields
1081 */
1082 public abstract ObjectStreamClass getObjectStreamClass();
1083
1084 /**
1085 * Return true if the named field is defaulted and has no value in this
1086 * stream.
1087 *
1088 * @param name the name of the field
1089 * @return true, if and only if the named field is defaulted
1090 * @throws IOException if there are I/O errors while reading from
1091 * the underlying <code>InputStream</code>
1092 * @throws IllegalArgumentException if <code>name</code> does not
1093 * correspond to a serializable field
1094 */
1095 public abstract boolean defaulted(String name) throws IOException;
1096
1097 /**
1098 * Get the value of the named boolean field from the persistent field.
1099 *
1100 * @param name the name of the field
1101 * @param val the default value to use if <code>name</code> does not
1102 * have a value
1103 * @return the value of the named <code>boolean</code> field
1104 * @throws IOException if there are I/O errors while reading from the
1105 * underlying <code>InputStream</code>
1106 * @throws IllegalArgumentException if type of <code>name</code> is
1107 * not serializable or if the field type is incorrect
1108 */
1109 public abstract boolean get(String name, boolean val)
1110 throws IOException;
1111
1112 /**
1113 * Get the value of the named byte field from the persistent field.
1114 *
1115 * @param name the name of the field
1116 * @param val the default value to use if <code>name</code> does not
1117 * have a value
1118 * @return the value of the named <code>byte</code> field
1119 * @throws IOException if there are I/O errors while reading from the
1120 * underlying <code>InputStream</code>
1121 * @throws IllegalArgumentException if type of <code>name</code> is
1122 * not serializable or if the field type is incorrect
1123 */
1124 public abstract byte get(String name, byte val) throws IOException;
1125
1126 /**
1127 * Get the value of the named char field from the persistent field.
1128 *
1129 * @param name the name of the field
1130 * @param val the default value to use if <code>name</code> does not
1131 * have a value
1132 * @return the value of the named <code>char</code> field
1133 * @throws IOException if there are I/O errors while reading from the
1134 * underlying <code>InputStream</code>
1135 * @throws IllegalArgumentException if type of <code>name</code> is
1136 * not serializable or if the field type is incorrect
1137 */
1138 public abstract char get(String name, char val) throws IOException;
1139
1140 /**
1141 * Get the value of the named short field from the persistent field.
1142 *
1143 * @param name the name of the field
1144 * @param val the default value to use if <code>name</code> does not
1145 * have a value
1146 * @return the value of the named <code>short</code> field
1147 * @throws IOException if there are I/O errors while reading from the
1148 * underlying <code>InputStream</code>
1149 * @throws IllegalArgumentException if type of <code>name</code> is
1150 * not serializable or if the field type is incorrect
1151 */
1152 public abstract short get(String name, short val) throws IOException;
1153
1154 /**
1155 * Get the value of the named int field from the persistent field.
1156 *
1157 * @param name the name of the field
1158 * @param val the default value to use if <code>name</code> does not
1159 * have a value
1160 * @return the value of the named <code>int</code> field
1161 * @throws IOException if there are I/O errors while reading from the
1162 * underlying <code>InputStream</code>
1163 * @throws IllegalArgumentException if type of <code>name</code> is
1164 * not serializable or if the field type is incorrect
1165 */
1166 public abstract int get(String name, int val) throws IOException;
1167
1168 /**
1169 * Get the value of the named long field from the persistent field.
1170 *
1171 * @param name the name of the field
1172 * @param val the default value to use if <code>name</code> does not
1173 * have a value
1174 * @return the value of the named <code>long</code> field
1175 * @throws IOException if there are I/O errors while reading from the
1176 * underlying <code>InputStream</code>
1177 * @throws IllegalArgumentException if type of <code>name</code> is
1178 * not serializable or if the field type is incorrect
1179 */
1180 public abstract long get(String name, long val) throws IOException;
1181
1182 /**
1183 * Get the value of the named float field from the persistent field.
1184 *
1185 * @param name the name of the field
1186 * @param val the default value to use if <code>name</code> does not
1187 * have a value
1188 * @return the value of the named <code>float</code> field
1189 * @throws IOException if there are I/O errors while reading from the
1190 * underlying <code>InputStream</code>
1191 * @throws IllegalArgumentException if type of <code>name</code> is
1192 * not serializable or if the field type is incorrect
1193 */
1194 public abstract float get(String name, float val) throws IOException;
1195
1196 /**
1197 * Get the value of the named double field from the persistent field.
1198 *
1199 * @param name the name of the field
1200 * @param val the default value to use if <code>name</code> does not
1201 * have a value
1202 * @return the value of the named <code>double</code> field
1203 * @throws IOException if there are I/O errors while reading from the
1204 * underlying <code>InputStream</code>
1205 * @throws IllegalArgumentException if type of <code>name</code> is
1206 * not serializable or if the field type is incorrect
1207 */
1208 public abstract double get(String name, double val) throws IOException;
1209
1210 /**
1211 * Get the value of the named Object field from the persistent field.
1212 *
1213 * @param name the name of the field
1214 * @param val the default value to use if <code>name</code> does not
1215 * have a value
1216 * @return the value of the named <code>Object</code> field
1217 * @throws IOException if there are I/O errors while reading from the
1218 * underlying <code>InputStream</code>
1219 * @throws IllegalArgumentException if type of <code>name</code> is
1220 * not serializable or if the field type is incorrect
1221 */
1222 public abstract Object get(String name, Object val) throws IOException;
1223 }
1224
1225 /**
1226 * Verifies that this (possibly subclass) instance can be constructed
1227 * without violating security constraints: the subclass must not override
1228 * security-sensitive non-final methods, or else the
1229 * "enableSubclassImplementation" SerializablePermission is checked.
1230 */
1231 private void verifySubclass() {
1232 Class cl = getClass();
1233 if (cl == ObjectInputStream.class) {
1234 return;
1235 }
1236 SecurityManager sm = System.getSecurityManager();
1237 if (sm == null) {
1238 return;
1239 }
1240 processQueue(Caches.subclassAuditsQueue, Caches.subclassAudits);
1241 WeakClassKey key = new WeakClassKey(cl, Caches.subclassAuditsQueue);
1242 Boolean result = Caches.subclassAudits.get(key);
1243 if (result == null) {
1244 result = Boolean.valueOf(auditSubclass(cl));
1245 Caches.subclassAudits.putIfAbsent(key, result);
1246 }
1247 if (result.booleanValue()) {
1248 return;
1249 }
1250 sm.checkPermission(SUBCLASS_IMPLEMENTATION_PERMISSION);
1251 }
1252
1253 /**
1254 * Performs reflective checks on given subclass to verify that it doesn't
1255 * override security-sensitive non-final methods. Returns true if subclass
1256 * is "safe", false otherwise.
1257 */
1258 private static boolean auditSubclass(final Class<?> subcl) {
1259 Boolean result = AccessController.doPrivileged(
1260 new PrivilegedAction<Boolean>() {
1261 public Boolean run() {
1262 for (Class<?> cl = subcl;
1263 cl != ObjectInputStream.class;
1264 cl = cl.getSuperclass())
1265 {
1266 try {
1267 cl.getDeclaredMethod(
1268 "readUnshared", (Class[]) null);
1269 return Boolean.FALSE;
1270 } catch (NoSuchMethodException ex) {
1271 }
1272 try {
1273 cl.getDeclaredMethod("readFields", (Class[]) null);
1274 return Boolean.FALSE;
1275 } catch (NoSuchMethodException ex) {
1276 }
1277 }
1278 return Boolean.TRUE;
1279 }
1280 }
1281 );
1282 return result.booleanValue();
1283 }
1284
1285 /**
1286 * Clears internal data structures.
1287 */
1288 private void clear() {
1289 handles.clear();
1290 vlist.clear();
1291 }
1292
1293 /**
1294 * Underlying readObject implementation.
1295 */
1296 private Object readObject0(boolean unshared) throws IOException {
1297 boolean oldMode = bin.getBlockDataMode();
1298 if (oldMode) {
1299 int remain = bin.currentBlockRemaining();
1300 if (remain > 0) {
1301 throw new OptionalDataException(remain);
1302 } else if (defaultDataEnd) {
1303 /*
1304 * Fix for 4360508: stream is currently at the end of a field
1305 * value block written via default serialization; since there
1306 * is no terminating TC_ENDBLOCKDATA tag, simulate
1307 * end-of-custom-data behavior explicitly.
1308 */
1309 throw new OptionalDataException(true);
1310 }
1311 bin.setBlockDataMode(false);
1312 }
1313
1314 byte tc;
1315 while ((tc = bin.peekByte()) == TC_RESET) {
1316 bin.readByte();
1317 handleReset();
1318 }
1319
1320 depth++;
1321 try {
1322 switch (tc) {
1323 case TC_NULL:
1324 return readNull();
1325
1326 case TC_REFERENCE:
1327 return readHandle(unshared);
1328
1329 case TC_CLASS:
1330 return readClass(unshared);
1331
1332 case TC_CLASSDESC:
1333 case TC_PROXYCLASSDESC:
1334 return readClassDesc(unshared);
1335
1336 case TC_STRING:
1337 case TC_LONGSTRING:
1338 return checkResolve(readString(unshared));
1339
1340 case TC_ARRAY:
1341 return checkResolve(readArray(unshared));
1342
1343 case TC_ENUM:
1344 return checkResolve(readEnum(unshared));
1345
1346 case TC_OBJECT:
1347 return checkResolve(readOrdinaryObject(unshared));
1348
1349 case TC_EXCEPTION:
1350 IOException ex = readFatalException();
1351 throw new WriteAbortedException("writing aborted", ex);
1352
1353 case TC_BLOCKDATA:
1354 case TC_BLOCKDATALONG:
1355 if (oldMode) {
1356 bin.setBlockDataMode(true);
1357 bin.peek(); // force header read
1358 throw new OptionalDataException(
1359 bin.currentBlockRemaining());
1360 } else {
1361 throw new StreamCorruptedException(
1362 "unexpected block data");
1363 }
1364
1365 case TC_ENDBLOCKDATA:
1366 if (oldMode) {
1367 throw new OptionalDataException(true);
1368 } else {
1369 throw new StreamCorruptedException(
1370 "unexpected end of block data");
1371 }
1372
1373 default:
1374 throw new StreamCorruptedException(
1375 String.format("invalid type code: %02X", tc));
1376 }
1377 } finally {
1378 depth--;
1379 bin.setBlockDataMode(oldMode);
1380 }
1381 }
1382
1383 /**
1384 * If resolveObject has been enabled and given object does not have an
1385 * exception associated with it, calls resolveObject to determine
1386 * replacement for object, and updates handle table accordingly. Returns
1387 * replacement object, or echoes provided object if no replacement
1388 * occurred. Expects that passHandle is set to given object's handle prior
1389 * to calling this method.
1390 */
1391 private Object checkResolve(Object obj) throws IOException {
1392 if (!enableResolve || handles.lookupException(passHandle) != null) {
1393 return obj;
1394 }
1395 Object rep = resolveObject(obj);
1396 if (rep != obj) {
1397 handles.setObject(passHandle, rep);
1398 }
1399 return rep;
1400 }
1401
1402 /**
1403 * Reads string without allowing it to be replaced in stream. Called from
1404 * within ObjectStreamClass.read().
1405 */
1406 String readTypeString() throws IOException {
1407 int oldHandle = passHandle;
1408 try {
1409 byte tc = bin.peekByte();
1410 switch (tc) {
1411 case TC_NULL:
1412 return (String) readNull();
1413
1414 case TC_REFERENCE:
1415 return (String) readHandle(false);
1416
1417 case TC_STRING:
1418 case TC_LONGSTRING:
1419 return readString(false);
1420
1421 default:
1422 throw new StreamCorruptedException(
1423 String.format("invalid type code: %02X", tc));
1424 }
1425 } finally {
1426 passHandle = oldHandle;
1427 }
1428 }
1429
1430 /**
1431 * Reads in null code, sets passHandle to NULL_HANDLE and returns null.
1432 */
1433 private Object readNull() throws IOException {
1434 if (bin.readByte() != TC_NULL) {
1435 throw new InternalError();
1436 }
1437 passHandle = NULL_HANDLE;
1438 return null;
1439 }
1440
1441 /**
1442 * Reads in object handle, sets passHandle to the read handle, and returns
1443 * object associated with the handle.
1444 */
1445 private Object readHandle(boolean unshared) throws IOException {
1446 if (bin.readByte() != TC_REFERENCE) {
1447 throw new InternalError();
1448 }
1449 passHandle = bin.readInt() - baseWireHandle;
1450 if (passHandle < 0 || passHandle >= handles.size()) {
1451 throw new StreamCorruptedException(
1452 String.format("invalid handle value: %08X", passHandle +
1453 baseWireHandle));
1454 }
1455 if (unshared) {
1456 // REMIND: what type of exception to throw here?
1457 throw new InvalidObjectException(
1458 "cannot read back reference as unshared");
1459 }
1460
1461 Object obj = handles.lookupObject(passHandle);
1462 if (obj == unsharedMarker) {
1463 // REMIND: what type of exception to throw here?
1464 throw new InvalidObjectException(
1465 "cannot read back reference to unshared object");
1466 }
1467 return obj;
1468 }
1469
1470 /**
1471 * Reads in and returns class object. Sets passHandle to class object's
1472 * assigned handle. Returns null if class is unresolvable (in which case a
1473 * ClassNotFoundException will be associated with the class' handle in the
1474 * handle table).
1475 */
1476 private Class readClass(boolean unshared) throws IOException {
1477 if (bin.readByte() != TC_CLASS) {
1478 throw new InternalError();
1479 }
1480 ObjectStreamClass desc = readClassDesc(false);
1481 Class cl = desc.forClass();
1482 passHandle = handles.assign(unshared ? unsharedMarker : cl);
1483
1484 ClassNotFoundException resolveEx = desc.getResolveException();
1485 if (resolveEx != null) {
1486 handles.markException(passHandle, resolveEx);
1487 }
1488
1489 handles.finish(passHandle);
1490 return cl;
1491 }
1492
1493 /**
1494 * Reads in and returns (possibly null) class descriptor. Sets passHandle
1495 * to class descriptor's assigned handle. If class descriptor cannot be
1496 * resolved to a class in the local VM, a ClassNotFoundException is
1497 * associated with the class descriptor's handle.
1498 */
1499 private ObjectStreamClass readClassDesc(boolean unshared)
1500 throws IOException
1501 {
1502 byte tc = bin.peekByte();
1503 switch (tc) {
1504 case TC_NULL:
1505 return (ObjectStreamClass) readNull();
1506
1507 case TC_REFERENCE:
1508 return (ObjectStreamClass) readHandle(unshared);
1509
1510 case TC_PROXYCLASSDESC:
1511 return readProxyDesc(unshared);
1512
1513 case TC_CLASSDESC:
1514 return readNonProxyDesc(unshared);
1515
1516 default:
1517 throw new StreamCorruptedException(
1518 String.format("invalid type code: %02X", tc));
1519 }
1520 }
1521
1522 /**
1523 * Reads in and returns class descriptor for a dynamic proxy class. Sets
1524 * passHandle to proxy class descriptor's assigned handle. If proxy class
1525 * descriptor cannot be resolved to a class in the local VM, a
1526 * ClassNotFoundException is associated with the descriptor's handle.
1527 */
1528 private ObjectStreamClass readProxyDesc(boolean unshared)
1529 throws IOException
1530 {
1531 if (bin.readByte() != TC_PROXYCLASSDESC) {
1532 throw new InternalError();
1533 }
1534
1535 ObjectStreamClass desc = new ObjectStreamClass();
1536 int descHandle = handles.assign(unshared ? unsharedMarker : desc);
1537 passHandle = NULL_HANDLE;
1538
1539 int numIfaces = bin.readInt();
1540 String[] ifaces = new String[numIfaces];
1541 for (int i = 0; i < numIfaces; i++) {
1542 ifaces[i] = bin.readUTF();
1543 }
1544
1545 Class cl = null;
1546 ClassNotFoundException resolveEx = null;
1547 bin.setBlockDataMode(true);
1548 try {
1549 if ((cl = resolveProxyClass(ifaces)) == null) {
1550 resolveEx = new ClassNotFoundException("null class");
1551 }
1552 } catch (ClassNotFoundException ex) {
1553 resolveEx = ex;
1554 }
1555 skipCustomData();
1556
1557 desc.initProxy(cl, resolveEx, readClassDesc(false));
1558
1559 handles.finish(descHandle);
1560 passHandle = descHandle;
1561 return desc;
1562 }
1563
1564 /**
1565 * Reads in and returns class descriptor for a class that is not a dynamic
1566 * proxy class. Sets passHandle to class descriptor's assigned handle. If
1567 * class descriptor cannot be resolved to a class in the local VM, a
1568 * ClassNotFoundException is associated with the descriptor's handle.
1569 */
1570 private ObjectStreamClass readNonProxyDesc(boolean unshared)
1571 throws IOException
1572 {
1573 if (bin.readByte() != TC_CLASSDESC) {
1574 throw new InternalError();
1575 }
1576
1577 ObjectStreamClass desc = new ObjectStreamClass();
1578 int descHandle = handles.assign(unshared ? unsharedMarker : desc);
1579 passHandle = NULL_HANDLE;
1580
1581 ObjectStreamClass readDesc = null;
1582 try {
1583 readDesc = readClassDescriptor();
1584 } catch (ClassNotFoundException ex) {
1585 throw (IOException) new InvalidClassException(
1586 "failed to read class descriptor").initCause(ex);
1587 }
1588
1589 Class cl = null;
1590 ClassNotFoundException resolveEx = null;
1591 bin.setBlockDataMode(true);
1592 try {
1593 if ((cl = resolveClass(readDesc)) == null) {
1594 resolveEx = new ClassNotFoundException("null class");
1595 }
1596 } catch (ClassNotFoundException ex) {
1597 resolveEx = ex;
1598 }
1599 skipCustomData();
1600
1601 desc.initNonProxy(readDesc, cl, resolveEx, readClassDesc(false));
1602
1603 handles.finish(descHandle);
1604 passHandle = descHandle;
1605 return desc;
1606 }
1607
1608 /**
1609 * Reads in and returns new string. Sets passHandle to new string's
1610 * assigned handle.
1611 */
1612 private String readString(boolean unshared) throws IOException {
1613 String str;
1614 byte tc = bin.readByte();
1615 switch (tc) {
1616 case TC_STRING:
1617 str = bin.readUTF();
1618 break;
1619
1620 case TC_LONGSTRING:
1621 str = bin.readLongUTF();
1622 break;
1623
1624 default:
1625 throw new StreamCorruptedException(
1626 String.format("invalid type code: %02X", tc));
1627 }
1628 passHandle = handles.assign(unshared ? unsharedMarker : str);
1629 handles.finish(passHandle);
1630 return str;
1631 }
1632
1633 /**
1634 * Reads in and returns array object, or null if array class is
1635 * unresolvable. Sets passHandle to array's assigned handle.
1636 */
1637 private Object readArray(boolean unshared) throws IOException {
1638 if (bin.readByte() != TC_ARRAY) {
1639 throw new InternalError();
1640 }
1641
1642 ObjectStreamClass desc = readClassDesc(false);
1643 int len = bin.readInt();
1644
1645 Object array = null;
1646 Class cl, ccl = null;
1647 if ((cl = desc.forClass()) != null) {
1648 ccl = cl.getComponentType();
1649 array = Array.newInstance(ccl, len);
1650 }
1651
1652 int arrayHandle = handles.assign(unshared ? unsharedMarker : array);
1653 ClassNotFoundException resolveEx = desc.getResolveException();
1654 if (resolveEx != null) {
1655 handles.markException(arrayHandle, resolveEx);
1656 }
1657
1658 if (ccl == null) {
1659 for (int i = 0; i < len; i++) {
1660 readObject0(false);
1661 }
1662 } else if (ccl.isPrimitive()) {
1663 if (ccl == Integer.TYPE) {
1664 bin.readInts((int[]) array, 0, len);
1665 } else if (ccl == Byte.TYPE) {
1666 bin.readFully((byte[]) array, 0, len, true);
1667 } else if (ccl == Long.TYPE) {
1668 bin.readLongs((long[]) array, 0, len);
1669 } else if (ccl == Float.TYPE) {
1670 bin.readFloats((float[]) array, 0, len);
1671 } else if (ccl == Double.TYPE) {
1672 bin.readDoubles((double[]) array, 0, len);
1673 } else if (ccl == Short.TYPE) {
1674 bin.readShorts((short[]) array, 0, len);
1675 } else if (ccl == Character.TYPE) {
1676 bin.readChars((char[]) array, 0, len);
1677 } else if (ccl == Boolean.TYPE) {
1678 bin.readBooleans((boolean[]) array, 0, len);
1679 } else {
1680 throw new InternalError();
1681 }
1682 } else {
1683 Object[] oa = (Object[]) array;
1684 for (int i = 0; i < len; i++) {
1685 oa[i] = readObject0(false);
1686 handles.markDependency(arrayHandle, passHandle);
1687 }
1688 }
1689
1690 handles.finish(arrayHandle);
1691 passHandle = arrayHandle;
1692 return array;
1693 }
1694
1695 /**
1696 * Reads in and returns enum constant, or null if enum type is
1697 * unresolvable. Sets passHandle to enum constant's assigned handle.
1698 */
1699 private Enum readEnum(boolean unshared) throws IOException {
1700 if (bin.readByte() != TC_ENUM) {
1701 throw new InternalError();
1702 }
1703
1704 ObjectStreamClass desc = readClassDesc(false);
1705 if (!desc.isEnum()) {
1706 throw new InvalidClassException("non-enum class: " + desc);
1707 }
1708
1709 int enumHandle = handles.assign(unshared ? unsharedMarker : null);
1710 ClassNotFoundException resolveEx = desc.getResolveException();
1711 if (resolveEx != null) {
1712 handles.markException(enumHandle, resolveEx);
1713 }
1714
1715 String name = readString(false);
1716 Enum en = null;
1717 Class cl = desc.forClass();
1718 if (cl != null) {
1719 try {
1720 en = Enum.valueOf(cl, name);
1721 } catch (IllegalArgumentException ex) {
1722 throw (IOException) new InvalidObjectException(
1723 "enum constant " + name + " does not exist in " +
1724 cl).initCause(ex);
1725 }
1726 if (!unshared) {
1727 handles.setObject(enumHandle, en);
1728 }
1729 }
1730
1731 handles.finish(enumHandle);
1732 passHandle = enumHandle;
1733 return en;
1734 }
1735
1736 /**
1737 * Reads and returns "ordinary" (i.e., not a String, Class,
1738 * ObjectStreamClass, array, or enum constant) object, or null if object's
1739 * class is unresolvable (in which case a ClassNotFoundException will be
1740 * associated with object's handle). Sets passHandle to object's assigned
1741 * handle.
1742 */
1743 private Object readOrdinaryObject(boolean unshared)
1744 throws IOException
1745 {
1746 if (bin.readByte() != TC_OBJECT) {
1747 throw new InternalError();
1748 }
1749
1750 ObjectStreamClass desc = readClassDesc(false);
1751 desc.checkDeserialize();
1752
1753 Object obj;
1754 try {
1755 obj = desc.isInstantiable() ? desc.newInstance() : null;
1756 } catch (Exception ex) {
1757 throw (IOException) new InvalidClassException(
1758 desc.forClass().getName(),
1759 "unable to create instance").initCause(ex);
1760 }
1761
1762 passHandle = handles.assign(unshared ? unsharedMarker : obj);
1763 ClassNotFoundException resolveEx = desc.getResolveException();
1764 if (resolveEx != null) {
1765 handles.markException(passHandle, resolveEx);
1766 }
1767
1768 if (desc.isExternalizable()) {
1769 readExternalData((Externalizable) obj, desc);
1770 } else {
1771 readSerialData(obj, desc);
1772 }
1773
1774 handles.finish(passHandle);
1775
1776 if (obj != null &&
1777 handles.lookupException(passHandle) == null &&
1778 desc.hasReadResolveMethod())
1779 {
1780 Object rep = desc.invokeReadResolve(obj);
1781 if (unshared && rep.getClass().isArray()) {
1782 rep = cloneArray(rep);
1783 }
1784 if (rep != obj) {
1785 handles.setObject(passHandle, obj = rep);
1786 }
1787 }
1788
1789 return obj;
1790 }
1791
1792 /**
1793 * If obj is non-null, reads externalizable data by invoking readExternal()
1794 * method of obj; otherwise, attempts to skip over externalizable data.
1795 * Expects that passHandle is set to obj's handle before this method is
1796 * called.
1797 */
1798 private void readExternalData(Externalizable obj, ObjectStreamClass desc)
1799 throws IOException
1800 {
1801 CallbackContext oldContext = curContext;
1802 curContext = null;
1803 try {
1804 boolean blocked = desc.hasBlockExternalData();
1805 if (blocked) {
1806 bin.setBlockDataMode(true);
1807 }
1808 if (obj != null) {
1809 try {
1810 obj.readExternal(this);
1811 } catch (ClassNotFoundException ex) {
1812 /*
1813 * In most cases, the handle table has already propagated
1814 * a CNFException to passHandle at this point; this mark
1815 * call is included to address cases where the readExternal
1816 * method has cons'ed and thrown a new CNFException of its
1817 * own.
1818 */
1819 handles.markException(passHandle, ex);
1820 }
1821 }
1822 if (blocked) {
1823 skipCustomData();
1824 }
1825 } finally {
1826 curContext = oldContext;
1827 }
1828 /*
1829 * At this point, if the externalizable data was not written in
1830 * block-data form and either the externalizable class doesn't exist
1831 * locally (i.e., obj == null) or readExternal() just threw a
1832 * CNFException, then the stream is probably in an inconsistent state,
1833 * since some (or all) of the externalizable data may not have been
1834 * consumed. Since there's no "correct" action to take in this case,
1835 * we mimic the behavior of past serialization implementations and
1836 * blindly hope that the stream is in sync; if it isn't and additional
1837 * externalizable data remains in the stream, a subsequent read will
1838 * most likely throw a StreamCorruptedException.
1839 */
1840 }
1841
1842 /**
1843 * Reads (or attempts to skip, if obj is null or is tagged with a
1844 * ClassNotFoundException) instance data for each serializable class of
1845 * object in stream, from superclass to subclass. Expects that passHandle
1846 * is set to obj's handle before this method is called.
1847 */
1848 private void readSerialData(Object obj, ObjectStreamClass desc)
1849 throws IOException
1850 {
1851 ObjectStreamClass.ClassDataSlot[] slots = desc.getClassDataLayout();
1852 for (int i = 0; i < slots.length; i++) {
1853 ObjectStreamClass slotDesc = slots[i].desc;
1854
1855 if (slots[i].hasData) {
1856 if (obj != null &&
1857 slotDesc.hasReadObjectMethod() &&
1858 handles.lookupException(passHandle) == null)
1859 {
1860 CallbackContext oldContext = curContext;
1861
1862 try {
1863 curContext = new CallbackContext(obj, slotDesc);
1864
1865 bin.setBlockDataMode(true);
1866 slotDesc.invokeReadObject(obj, this);
1867 } catch (ClassNotFoundException ex) {
1868 /*
1869 * In most cases, the handle table has already
1870 * propagated a CNFException to passHandle at this
1871 * point; this mark call is included to address cases
1872 * where the custom readObject method has cons'ed and
1873 * thrown a new CNFException of its own.
1874 */
1875 handles.markException(passHandle, ex);
1876 } finally {
1877 curContext.setUsed();
1878 curContext = oldContext;
1879 }
1880
1881 /*
1882 * defaultDataEnd may have been set indirectly by custom
1883 * readObject() method when calling defaultReadObject() or
1884 * readFields(); clear it to restore normal read behavior.
1885 */
1886 defaultDataEnd = false;
1887 } else {
1888 defaultReadFields(obj, slotDesc);
1889 }
1890 if (slotDesc.hasWriteObjectData()) {
1891 skipCustomData();
1892 } else {
1893 bin.setBlockDataMode(false);
1894 }
1895 } else {
1896 if (obj != null &&
1897 slotDesc.hasReadObjectNoDataMethod() &&
1898 handles.lookupException(passHandle) == null)
1899 {
1900 slotDesc.invokeReadObjectNoData(obj);
1901 }
1902 }
1903 }
1904 }
1905
1906 /**
1907 * Skips over all block data and objects until TC_ENDBLOCKDATA is
1908 * encountered.
1909 */
1910 private void skipCustomData() throws IOException {
1911 int oldHandle = passHandle;
1912 for (;;) {
1913 if (bin.getBlockDataMode()) {
1914 bin.skipBlockData();
1915 bin.setBlockDataMode(false);
1916 }
1917 switch (bin.peekByte()) {
1918 case TC_BLOCKDATA:
1919 case TC_BLOCKDATALONG:
1920 bin.setBlockDataMode(true);
1921 break;
1922
1923 case TC_ENDBLOCKDATA:
1924 bin.readByte();
1925 passHandle = oldHandle;
1926 return;
1927
1928 default:
1929 readObject0(false);
1930 break;
1931 }
1932 }
1933 }
1934
1935 /**
1936 * Reads in values of serializable fields declared by given class
1937 * descriptor. If obj is non-null, sets field values in obj. Expects that
1938 * passHandle is set to obj's handle before this method is called.
1939 */
1940 private void defaultReadFields(Object obj, ObjectStreamClass desc)
1941 throws IOException
1942 {
1943 // REMIND: is isInstance check necessary?
1944 Class cl = desc.forClass();
1945 if (cl != null && obj != null && !cl.isInstance(obj)) {
1946 throw new ClassCastException();
1947 }
1948
1949 int primDataSize = desc.getPrimDataSize();
1950 if (primVals == null || primVals.length < primDataSize) {
1951 primVals = new byte[primDataSize];
1952 }
1953 bin.readFully(primVals, 0, primDataSize, false);
1954 if (obj != null) {
1955 desc.setPrimFieldValues(obj, primVals);
1956 }
1957
1958 int objHandle = passHandle;
1959 ObjectStreamField[] fields = desc.getFields(false);
1960 Object[] objVals = new Object[desc.getNumObjFields()];
1961 int numPrimFields = fields.length - objVals.length;
1962 for (int i = 0; i < objVals.length; i++) {
1963 ObjectStreamField f = fields[numPrimFields + i];
1964 objVals[i] = readObject0(f.isUnshared());
1965 if (f.getField() != null) {
1966 handles.markDependency(objHandle, passHandle);
1967 }
1968 }
1969 if (obj != null) {
1970 desc.setObjFieldValues(obj, objVals);
1971 }
1972 passHandle = objHandle;
1973 }
1974
1975 /**
1976 * Reads in and returns IOException that caused serialization to abort.
1977 * All stream state is discarded prior to reading in fatal exception. Sets
1978 * passHandle to fatal exception's handle.
1979 */
1980 private IOException readFatalException() throws IOException {
1981 if (bin.readByte() != TC_EXCEPTION) {
1982 throw new InternalError();
1983 }
1984 clear();
1985 return (IOException) readObject0(false);
1986 }
1987
1988 /**
1989 * If recursion depth is 0, clears internal data structures; otherwise,
1990 * throws a StreamCorruptedException. This method is called when a
1991 * TC_RESET typecode is encountered.
1992 */
1993 private void handleReset() throws StreamCorruptedException {
1994 if (depth > 0) {
1995 throw new StreamCorruptedException(
1996 "unexpected reset; recursion depth: " + depth);
1997 }
1998 clear();
1999 }
2000
2001 /**
2002 * Converts specified span of bytes into float values.
2003 */
2004 // REMIND: remove once hotspot inlines Float.intBitsToFloat
2005 private static native void bytesToFloats(byte[] src, int srcpos,
2006 float[] dst, int dstpos,
2007 int nfloats);
2008
2009 /**
2010 * Converts specified span of bytes into double values.
2011 */
2012 // REMIND: remove once hotspot inlines Double.longBitsToDouble
2013 private static native void bytesToDoubles(byte[] src, int srcpos,
2014 double[] dst, int dstpos,
2015 int ndoubles);
2016
2017 /**
2018 * Returns the first non-null class loader (not counting class loaders of
2019 * generated reflection implementation classes) up the execution stack, or
2020 * null if only code from the null class loader is on the stack. This
2021 * method is also called via reflection by the following RMI-IIOP class:
2022 *
2023 * com.sun.corba.se.internal.util.JDKClassLoader
2024 *
2025 * This method should not be removed or its signature changed without
2026 * corresponding modifications to the above class.
2027 */
2028 // REMIND: change name to something more accurate?
2029 private static native ClassLoader latestUserDefinedLoader();
2030
2031 /**
2032 * Default GetField implementation.
2033 */
2034 private class GetFieldImpl extends GetField {
2035
2036 /** class descriptor describing serializable fields */
2037 private final ObjectStreamClass desc;
2038 /** primitive field values */
2039 private final byte[] primVals;
2040 /** object field values */
2041 private final Object[] objVals;
2042 /** object field value handles */
2043 private final int[] objHandles;
2044
2045 /**
2046 * Creates GetFieldImpl object for reading fields defined in given
2047 * class descriptor.
2048 */
2049 GetFieldImpl(ObjectStreamClass desc) {
2050 this.desc = desc;
2051 primVals = new byte[desc.getPrimDataSize()];
2052 objVals = new Object[desc.getNumObjFields()];
2053 objHandles = new int[objVals.length];
2054 }
2055
2056 public ObjectStreamClass getObjectStreamClass() {
2057 return desc;
2058 }
2059
2060 public boolean defaulted(String name) throws IOException {
2061 return (getFieldOffset(name, null) < 0);
2062 }
2063
2064 public boolean get(String name, boolean val) throws IOException {
2065 int off = getFieldOffset(name, Boolean.TYPE);
2066 return (off >= 0) ? Bits.getBoolean(primVals, off) : val;
2067 }
2068
2069 public byte get(String name, byte val) throws IOException {
2070 int off = getFieldOffset(name, Byte.TYPE);
2071 return (off >= 0) ? primVals[off] : val;
2072 }
2073
2074 public char get(String name, char val) throws IOException {
2075 int off = getFieldOffset(name, Character.TYPE);
2076 return (off >= 0) ? Bits.getChar(primVals, off) : val;
2077 }
2078
2079 public short get(String name, short val) throws IOException {
2080 int off = getFieldOffset(name, Short.TYPE);
2081 return (off >= 0) ? Bits.getShort(primVals, off) : val;
2082 }
2083
2084 public int get(String name, int val) throws IOException {
2085 int off = getFieldOffset(name, Integer.TYPE);
2086 return (off >= 0) ? Bits.getInt(primVals, off) : val;
2087 }
2088
2089 public float get(String name, float val) throws IOException {
2090 int off = getFieldOffset(name, Float.TYPE);
2091 return (off >= 0) ? Bits.getFloat(primVals, off) : val;
2092 }
2093
2094 public long get(String name, long val) throws IOException {
2095 int off = getFieldOffset(name, Long.TYPE);
2096 return (off >= 0) ? Bits.getLong(primVals, off) : val;
2097 }
2098
2099 public double get(String name, double val) throws IOException {
2100 int off = getFieldOffset(name, Double.TYPE);
2101 return (off >= 0) ? Bits.getDouble(primVals, off) : val;
2102 }
2103
2104 public Object get(String name, Object val) throws IOException {
2105 int off = getFieldOffset(name, Object.class);
2106 if (off >= 0) {
2107 int objHandle = objHandles[off];
2108 handles.markDependency(passHandle, objHandle);
2109 return (handles.lookupException(objHandle) == null) ?
2110 objVals[off] : null;
2111 } else {
2112 return val;
2113 }
2114 }
2115
2116 /**
2117 * Reads primitive and object field values from stream.
2118 */
2119 void readFields() throws IOException {
2120 bin.readFully(primVals, 0, primVals.length, false);
2121
2122 int oldHandle = passHandle;
2123 ObjectStreamField[] fields = desc.getFields(false);
2124 int numPrimFields = fields.length - objVals.length;
2125 for (int i = 0; i < objVals.length; i++) {
2126 objVals[i] =
2127 readObject0(fields[numPrimFields + i].isUnshared());
2128 objHandles[i] = passHandle;
2129 }
2130 passHandle = oldHandle;
2131 }
2132
2133 /**
2134 * Returns offset of field with given name and type. A specified type
2135 * of null matches all types, Object.class matches all non-primitive
2136 * types, and any other non-null type matches assignable types only.
2137 * If no matching field is found in the (incoming) class
2138 * descriptor but a matching field is present in the associated local
2139 * class descriptor, returns -1. Throws IllegalArgumentException if
2140 * neither incoming nor local class descriptor contains a match.
2141 */
2142 private int getFieldOffset(String name, Class type) {
2143 ObjectStreamField field = desc.getField(name, type);
2144 if (field != null) {
2145 return field.getOffset();
2146 } else if (desc.getLocalDesc().getField(name, type) != null) {
2147 return -1;
2148 } else {
2149 throw new IllegalArgumentException("no such field " + name +
2150 " with type " + type);
2151 }
2152 }
2153 }
2154
2155 /**
2156 * Prioritized list of callbacks to be performed once object graph has been
2157 * completely deserialized.
2158 */
2159 private static class ValidationList {
2160
2161 private static class Callback {
2162 final ObjectInputValidation obj;
2163 final int priority;
2164 Callback next;
2165 final AccessControlContext acc;
2166
2167 Callback(ObjectInputValidation obj, int priority, Callback next,
2168 AccessControlContext acc)
2169 {
2170 this.obj = obj;
2171 this.priority = priority;
2172 this.next = next;
2173 this.acc = acc;
2174 }
2175 }
2176
2177 /** linked list of callbacks */
2178 private Callback list;
2179
2180 /**
2181 * Creates new (empty) ValidationList.
2182 */
2183 ValidationList() {
2184 }
2185
2186 /**
2187 * Registers callback. Throws InvalidObjectException if callback
2188 * object is null.
2189 */
2190 void register(ObjectInputValidation obj, int priority)
2191 throws InvalidObjectException
2192 {
2193 if (obj == null) {
2194 throw new InvalidObjectException("null callback");
2195 }
2196
2197 Callback prev = null, cur = list;
2198 while (cur != null && priority < cur.priority) {
2199 prev = cur;
2200 cur = cur.next;
2201 }
2202 AccessControlContext acc = AccessController.getContext();
2203 if (prev != null) {
2204 prev.next = new Callback(obj, priority, cur, acc);
2205 } else {
2206 list = new Callback(obj, priority, list, acc);
2207 }
2208 }
2209
2210 /**
2211 * Invokes all registered callbacks and clears the callback list.
2212 * Callbacks with higher priorities are called first; those with equal
2213 * priorities may be called in any order. If any of the callbacks
2214 * throws an InvalidObjectException, the callback process is terminated
2215 * and the exception propagated upwards.
2216 */
2217 void doCallbacks() throws InvalidObjectException {
2218 try {
2219 while (list != null) {
2220 AccessController.doPrivileged(
2221 new PrivilegedExceptionAction<Void>()
2222 {
2223 public Void run() throws InvalidObjectException {
2224 list.obj.validateObject();
2225 return null;
2226 }
2227 }, list.acc);
2228 list = list.next;
2229 }
2230 } catch (PrivilegedActionException ex) {
2231 list = null;
2232 throw (InvalidObjectException) ex.getException();
2233 }
2234 }
2235
2236 /**
2237 * Resets the callback list to its initial (empty) state.
2238 */
2239 public void clear() {
2240 list = null;
2241 }
2242 }
2243
2244 /**
2245 * Input stream supporting single-byte peek operations.
2246 */
2247 private static class PeekInputStream extends InputStream {
2248
2249 /** underlying stream */
2250 private final InputStream in;
2251 /** peeked byte */
2252 private int peekb = -1;
2253
2254 /**
2255 * Creates new PeekInputStream on top of given underlying stream.
2256 */
2257 PeekInputStream(InputStream in) {
2258 this.in = in;
2259 }
2260
2261 /**
2262 * Peeks at next byte value in stream. Similar to read(), except
2263 * that it does not consume the read value.
2264 */
2265 int peek() throws IOException {
2266 return (peekb >= 0) ? peekb : (peekb = in.read());
2267 }
2268
2269 public int read() throws IOException {
2270 if (peekb >= 0) {
2271 int v = peekb;
2272 peekb = -1;
2273 return v;
2274 } else {
2275 return in.read();
2276 }
2277 }
2278
2279 public int read(byte[] b, int off, int len) throws IOException {
2280 if (len == 0) {
2281 return 0;
2282 } else if (peekb < 0) {
2283 return in.read(b, off, len);
2284 } else {
2285 b[off++] = (byte) peekb;
2286 len--;
2287 peekb = -1;
2288 int n = in.read(b, off, len);
2289 return (n >= 0) ? (n + 1) : 1;
2290 }
2291 }
2292
2293 void readFully(byte[] b, int off, int len) throws IOException {
2294 int n = 0;
2295 
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