1 /* 2 * Copyright (c) 1996, 2019, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.io; 27 28 import java.io.ObjectStreamClass.WeakClassKey; 29 import java.lang.System.Logger; 30 import java.lang.ref.ReferenceQueue; 31 import java.lang.reflect.Array; 32 import java.lang.reflect.Modifier; 33 import java.lang.reflect.Proxy; 34 import java.security.AccessControlContext; 35 import java.security.AccessController; 36 import java.security.PrivilegedAction; 37 import java.security.PrivilegedActionException; 38 import java.security.PrivilegedExceptionAction; 39 import java.util.Arrays; 40 import java.util.Map; 41 import java.util.Objects; 42 import java.util.concurrent.ConcurrentHashMap; 43 import java.util.concurrent.ConcurrentMap; 44 45 import static java.io.ObjectStreamClass.processQueue; 46 47 import jdk.internal.access.SharedSecrets; 48 import jdk.internal.misc.Unsafe; 49 import sun.reflect.misc.ReflectUtil; 50 51 /** 52 * An ObjectInputStream deserializes primitive data and objects previously 53 * written using an ObjectOutputStream. 54 * 55 * <p><strong>Warning: Deserialization of untrusted data is inherently dangerous 56 * and should be avoided. Untrusted data should be carefully validated according to the 57 * "Serialization and Deserialization" section of the 58 * {@extLink secure_coding_guidelines_javase Secure Coding Guidelines for Java SE}. 59 * {@extLink serialization_filter_guide Serialization Filtering} describes best 60 * practices for defensive use of serial filters. 61 * </strong></p> 62 * 63 * <p>ObjectOutputStream and ObjectInputStream can provide an application with 64 * persistent storage for graphs of objects when used with a FileOutputStream 65 * and FileInputStream respectively. ObjectInputStream is used to recover 66 * those objects previously serialized. Other uses include passing objects 67 * between hosts using a socket stream or for marshaling and unmarshaling 68 * arguments and parameters in a remote communication system. 69 * 70 * <p>ObjectInputStream ensures that the types of all objects in the graph 71 * created from the stream match the classes present in the Java Virtual 72 * Machine. Classes are loaded as required using the standard mechanisms. 73 * 74 * <p>Only objects that support the java.io.Serializable or 75 * java.io.Externalizable interface can be read from streams. 76 * 77 * <p>The method <code>readObject</code> is used to read an object from the 78 * stream. Java's safe casting should be used to get the desired type. In 79 * Java, strings and arrays are objects and are treated as objects during 80 * serialization. When read they need to be cast to the expected type. 81 * 82 * <p>Primitive data types can be read from the stream using the appropriate 83 * method on DataInput. 84 * 85 * <p>The default deserialization mechanism for objects restores the contents 86 * of each field to the value and type it had when it was written. Fields 87 * declared as transient or static are ignored by the deserialization process. 88 * References to other objects cause those objects to be read from the stream 89 * as necessary. Graphs of objects are restored correctly using a reference 90 * sharing mechanism. New objects are always allocated when deserializing, 91 * which prevents existing objects from being overwritten. 92 * 93 * <p>Reading an object is analogous to running the constructors of a new 94 * object. Memory is allocated for the object and initialized to zero (NULL). 95 * No-arg constructors are invoked for the non-serializable classes and then 96 * the fields of the serializable classes are restored from the stream starting 97 * with the serializable class closest to java.lang.object and finishing with 98 * the object's most specific class. 99 * 100 * <p>For example to read from a stream as written by the example in 101 * ObjectOutputStream: 102 * <br> 103 * <pre> 104 * FileInputStream fis = new FileInputStream("t.tmp"); 105 * ObjectInputStream ois = new ObjectInputStream(fis); 106 * 107 * int i = ois.readInt(); 108 * String today = (String) ois.readObject(); 109 * Date date = (Date) ois.readObject(); 110 * 111 * ois.close(); 112 * </pre> 113 * 114 * <p>Classes control how they are serialized by implementing either the 115 * java.io.Serializable or java.io.Externalizable interfaces. 116 * 117 * <p>Implementing the Serializable interface allows object serialization to 118 * save and restore the entire state of the object and it allows classes to 119 * evolve between the time the stream is written and the time it is read. It 120 * automatically traverses references between objects, saving and restoring 121 * entire graphs. 122 * 123 * <p>Serializable classes that require special handling during the 124 * serialization and deserialization process should implement the following 125 * methods: 126 * 127 * <pre> 128 * private void writeObject(java.io.ObjectOutputStream stream) 129 * throws IOException; 130 * private void readObject(java.io.ObjectInputStream stream) 131 * throws IOException, ClassNotFoundException; 132 * private void readObjectNoData() 133 * throws ObjectStreamException; 134 * </pre> 135 * 136 * <p>The readObject method is responsible for reading and restoring the state 137 * of the object for its particular class using data written to the stream by 138 * the corresponding writeObject method. The method does not need to concern 139 * itself with the state belonging to its superclasses or subclasses. State is 140 * restored by reading data from the ObjectInputStream for the individual 141 * fields and making assignments to the appropriate fields of the object. 142 * Reading primitive data types is supported by DataInput. 143 * 144 * <p>Any attempt to read object data which exceeds the boundaries of the 145 * custom data written by the corresponding writeObject method will cause an 146 * OptionalDataException to be thrown with an eof field value of true. 147 * Non-object reads which exceed the end of the allotted data will reflect the 148 * end of data in the same way that they would indicate the end of the stream: 149 * bytewise reads will return -1 as the byte read or number of bytes read, and 150 * primitive reads will throw EOFExceptions. If there is no corresponding 151 * writeObject method, then the end of default serialized data marks the end of 152 * the allotted data. 153 * 154 * <p>Primitive and object read calls issued from within a readExternal method 155 * behave in the same manner--if the stream is already positioned at the end of 156 * data written by the corresponding writeExternal method, object reads will 157 * throw OptionalDataExceptions with eof set to true, bytewise reads will 158 * return -1, and primitive reads will throw EOFExceptions. Note that this 159 * behavior does not hold for streams written with the old 160 * <code>ObjectStreamConstants.PROTOCOL_VERSION_1</code> protocol, in which the 161 * end of data written by writeExternal methods is not demarcated, and hence 162 * cannot be detected. 163 * 164 * <p>The readObjectNoData method is responsible for initializing the state of 165 * the object for its particular class in the event that the serialization 166 * stream does not list the given class as a superclass of the object being 167 * deserialized. This may occur in cases where the receiving party uses a 168 * different version of the deserialized instance's class than the sending 169 * party, and the receiver's version extends classes that are not extended by 170 * the sender's version. This may also occur if the serialization stream has 171 * been tampered; hence, readObjectNoData is useful for initializing 172 * deserialized objects properly despite a "hostile" or incomplete source 173 * stream. 174 * 175 * <p>Serialization does not read or assign values to the fields of any object 176 * that does not implement the java.io.Serializable interface. Subclasses of 177 * Objects that are not serializable can be serializable. In this case the 178 * non-serializable class must have a no-arg constructor to allow its fields to 179 * be initialized. In this case it is the responsibility of the subclass to 180 * save and restore the state of the non-serializable class. It is frequently 181 * the case that the fields of that class are accessible (public, package, or 182 * protected) or that there are get and set methods that can be used to restore 183 * the state. 184 * 185 * <p>The contents of the stream can be filtered during deserialization. 186 * If a {@linkplain #setObjectInputFilter(ObjectInputFilter) filter is set} 187 * on an ObjectInputStream, the {@link ObjectInputFilter} can check that 188 * the classes, array lengths, number of references in the stream, depth, and 189 * number of bytes consumed from the input stream are allowed and 190 * if not, can terminate deserialization. 191 * A {@linkplain ObjectInputFilter.Config#setSerialFilter(ObjectInputFilter) system-wide filter} 192 * can be configured that is applied to each {@code ObjectInputStream} unless replaced 193 * using {@link #setObjectInputFilter(ObjectInputFilter) setObjectInputFilter}. 194 * 195 * <p>Any exception that occurs while deserializing an object will be caught by 196 * the ObjectInputStream and abort the reading process. 197 * 198 * <p>Implementing the Externalizable interface allows the object to assume 199 * complete control over the contents and format of the object's serialized 200 * form. The methods of the Externalizable interface, writeExternal and 201 * readExternal, are called to save and restore the objects state. When 202 * implemented by a class they can write and read their own state using all of 203 * the methods of ObjectOutput and ObjectInput. It is the responsibility of 204 * the objects to handle any versioning that occurs. 205 * 206 * <p>Enum constants are deserialized differently than ordinary serializable or 207 * externalizable objects. The serialized form of an enum constant consists 208 * solely of its name; field values of the constant are not transmitted. To 209 * deserialize an enum constant, ObjectInputStream reads the constant name from 210 * the stream; the deserialized constant is then obtained by calling the static 211 * method <code>Enum.valueOf(Class, String)</code> with the enum constant's 212 * base type and the received constant name as arguments. Like other 213 * serializable or externalizable objects, enum constants can function as the 214 * targets of back references appearing subsequently in the serialization 215 * stream. The process by which enum constants are deserialized cannot be 216 * customized: any class-specific readObject, readObjectNoData, and readResolve 217 * methods defined by enum types are ignored during deserialization. 218 * Similarly, any serialPersistentFields or serialVersionUID field declarations 219 * are also ignored--all enum types have a fixed serialVersionUID of 0L. 220 * 221 * @author Mike Warres 222 * @author Roger Riggs 223 * @see java.io.DataInput 224 * @see java.io.ObjectOutputStream 225 * @see java.io.Serializable 226 * @see <a href="{@docRoot}/../specs/serialization/input.html"> 227 * Object Serialization Specification, Section 3, Object Input Classes</a> 228 * @since 1.1 229 */ 230 public class ObjectInputStream 231 extends InputStream implements ObjectInput, ObjectStreamConstants 232 { 233 /** handle value representing null */ 234 private static final int NULL_HANDLE = -1; 235 236 /** marker for unshared objects in internal handle table */ 237 private static final Object unsharedMarker = new Object(); 238 239 /** 240 * immutable table mapping primitive type names to corresponding 241 * class objects 242 */ 243 private static final Map<String, Class<?>> primClasses = 244 Map.of("boolean", boolean.class, 245 "byte", byte.class, 246 "char", char.class, 247 "short", short.class, 248 "int", int.class, 249 "long", long.class, 250 "float", float.class, 251 "double", double.class, 252 "void", void.class); 253 254 private static class Caches { 255 /** cache of subclass security audit results */ 256 static final ConcurrentMap<WeakClassKey,Boolean> subclassAudits = 257 new ConcurrentHashMap<>(); 258 259 /** queue for WeakReferences to audited subclasses */ 260 static final ReferenceQueue<Class<?>> subclassAuditsQueue = 261 new ReferenceQueue<>(); 262 } 263 264 /* 265 * Separate class to defer initialization of logging until needed. 266 */ 267 private static class Logging { 268 /* 269 * Logger for ObjectInputFilter results. 270 * Setup the filter logger if it is set to DEBUG or TRACE. 271 * (Assuming it will not change). 272 */ 273 static final System.Logger filterLogger; 274 275 static { 276 Logger filterLog = System.getLogger("java.io.serialization"); 277 filterLogger = (filterLog.isLoggable(Logger.Level.DEBUG) 278 || filterLog.isLoggable(Logger.Level.TRACE)) ? filterLog : null; 279 } 280 } 281 282 /** filter stream for handling block data conversion */ 283 private final BlockDataInputStream bin; 284 /** validation callback list */ 285 private final ValidationList vlist; 286 /** recursion depth */ 287 private long depth; 288 /** Total number of references to any type of object, class, enum, proxy, etc. */ 289 private long totalObjectRefs; 290 /** whether stream is closed */ 291 private boolean closed; 292 293 /** wire handle -> obj/exception map */ 294 private final HandleTable handles; 295 /** scratch field for passing handle values up/down call stack */ 296 private int passHandle = NULL_HANDLE; 297 /** flag set when at end of field value block with no TC_ENDBLOCKDATA */ 298 private boolean defaultDataEnd = false; 299 300 /** if true, invoke readObjectOverride() instead of readObject() */ 301 private final boolean enableOverride; 302 /** if true, invoke resolveObject() */ 303 private boolean enableResolve; 304 305 /** 306 * Context during upcalls to class-defined readObject methods; holds 307 * object currently being deserialized and descriptor for current class. 308 * Null when not during readObject upcall. 309 */ 310 private SerialCallbackContext curContext; 311 312 /** 313 * Filter of class descriptors and classes read from the stream; 314 * may be null. 315 */ 316 private ObjectInputFilter serialFilter; 317 318 /** 319 * Creates an ObjectInputStream that reads from the specified InputStream. 320 * A serialization stream header is read from the stream and verified. 321 * This constructor will block until the corresponding ObjectOutputStream 322 * has written and flushed the header. 323 * 324 * <p>The serialization filter is initialized to the value of 325 * {@linkplain ObjectInputFilter.Config#getSerialFilter() the system-wide filter}. 326 * 327 * <p>If a security manager is installed, this constructor will check for 328 * the "enableSubclassImplementation" SerializablePermission when invoked 329 * directly or indirectly by the constructor of a subclass which overrides 330 * the ObjectInputStream.readFields or ObjectInputStream.readUnshared 331 * methods. 332 * 333 * @param in input stream to read from 334 * @throws StreamCorruptedException if the stream header is incorrect 335 * @throws IOException if an I/O error occurs while reading stream header 336 * @throws SecurityException if untrusted subclass illegally overrides 337 * security-sensitive methods 338 * @throws NullPointerException if <code>in</code> is <code>null</code> 339 * @see ObjectInputStream#ObjectInputStream() 340 * @see ObjectInputStream#readFields() 341 * @see ObjectOutputStream#ObjectOutputStream(OutputStream) 342 */ 343 public ObjectInputStream(InputStream in) throws IOException { 344 verifySubclass(); 345 bin = new BlockDataInputStream(in); 346 handles = new HandleTable(10); 347 vlist = new ValidationList(); 348 serialFilter = ObjectInputFilter.Config.getSerialFilter(); 349 enableOverride = false; 350 readStreamHeader(); 351 bin.setBlockDataMode(true); 352 } 353 354 /** 355 * Provide a way for subclasses that are completely reimplementing 356 * ObjectInputStream to not have to allocate private data just used by this 357 * implementation of ObjectInputStream. 358 * 359 * <p>The serialization filter is initialized to the value of 360 * {@linkplain ObjectInputFilter.Config#getSerialFilter() the system-wide filter}. 361 * 362 * <p>If there is a security manager installed, this method first calls the 363 * security manager's <code>checkPermission</code> method with the 364 * <code>SerializablePermission("enableSubclassImplementation")</code> 365 * permission to ensure it's ok to enable subclassing. 366 * 367 * @throws SecurityException if a security manager exists and its 368 * <code>checkPermission</code> method denies enabling 369 * subclassing. 370 * @throws IOException if an I/O error occurs while creating this stream 371 * @see SecurityManager#checkPermission 372 * @see java.io.SerializablePermission 373 */ 374 protected ObjectInputStream() throws IOException, SecurityException { 375 SecurityManager sm = System.getSecurityManager(); 376 if (sm != null) { 377 sm.checkPermission(SUBCLASS_IMPLEMENTATION_PERMISSION); 378 } 379 bin = null; 380 handles = null; 381 vlist = null; 382 serialFilter = ObjectInputFilter.Config.getSerialFilter(); 383 enableOverride = true; 384 } 385 386 /** 387 * Read an object from the ObjectInputStream. The class of the object, the 388 * signature of the class, and the values of the non-transient and 389 * non-static fields of the class and all of its supertypes are read. 390 * Default deserializing for a class can be overridden using the writeObject 391 * and readObject methods. Objects referenced by this object are read 392 * transitively so that a complete equivalent graph of objects is 393 * reconstructed by readObject. 394 * 395 * <p>The root object is completely restored when all of its fields and the 396 * objects it references are completely restored. At this point the object 397 * validation callbacks are executed in order based on their registered 398 * priorities. The callbacks are registered by objects (in the readObject 399 * special methods) as they are individually restored. 400 * 401 * <p>The serialization filter, when not {@code null}, is invoked for 402 * each object (regular or class) read to reconstruct the root object. 403 * See {@link #setObjectInputFilter(ObjectInputFilter) setObjectInputFilter} for details. 404 * 405 * <p>Exceptions are thrown for problems with the InputStream and for 406 * classes that should not be deserialized. All exceptions are fatal to 407 * the InputStream and leave it in an indeterminate state; it is up to the 408 * caller to ignore or recover the stream state. 409 * 410 * @throws ClassNotFoundException Class of a serialized object cannot be 411 * found. 412 * @throws InvalidClassException Something is wrong with a class used by 413 * serialization. 414 * @throws StreamCorruptedException Control information in the 415 * stream is inconsistent. 416 * @throws OptionalDataException Primitive data was found in the 417 * stream instead of objects. 418 * @throws IOException Any of the usual Input/Output related exceptions. 419 */ 420 public final Object readObject() 421 throws IOException, ClassNotFoundException 422 { 423 if (enableOverride) { 424 return readObjectOverride(); 425 } 426 427 // if nested read, passHandle contains handle of enclosing object 428 int outerHandle = passHandle; 429 try { 430 Object obj = readObject0(false); 431 handles.markDependency(outerHandle, passHandle); 432 ClassNotFoundException ex = handles.lookupException(passHandle); 433 if (ex != null) { 434 throw ex; 435 } 436 if (depth == 0) { 437 vlist.doCallbacks(); 438 freeze(); 439 } 440 return obj; 441 } finally { 442 passHandle = outerHandle; 443 if (closed && depth == 0) { 444 clear(); 445 } 446 } 447 } 448 449 /** 450 * This method is called by trusted subclasses of ObjectInputStream that 451 + constructed ObjectInputStream using the protected no-arg constructor. 452 * The subclass is expected to provide an override method with the modifier 453 * "final". 454 * 455 * @return the Object read from the stream. 456 * @throws ClassNotFoundException Class definition of a serialized object 457 * cannot be found. 458 * @throws OptionalDataException Primitive data was found in the stream 459 * instead of objects. 460 * @throws IOException if I/O errors occurred while reading from the 461 * underlying stream 462 * @see #ObjectInputStream() 463 * @see #readObject() 464 * @since 1.2 465 */ 466 protected Object readObjectOverride() 467 throws IOException, ClassNotFoundException 468 { 469 return null; 470 } 471 472 /** 473 * Reads an "unshared" object from the ObjectInputStream. This method is 474 * identical to readObject, except that it prevents subsequent calls to 475 * readObject and readUnshared from returning additional references to the 476 * deserialized instance obtained via this call. Specifically: 477 * <ul> 478 * <li>If readUnshared is called to deserialize a back-reference (the 479 * stream representation of an object which has been written 480 * previously to the stream), an ObjectStreamException will be 481 * thrown. 482 * 483 * <li>If readUnshared returns successfully, then any subsequent attempts 484 * to deserialize back-references to the stream handle deserialized 485 * by readUnshared will cause an ObjectStreamException to be thrown. 486 * </ul> 487 * Deserializing an object via readUnshared invalidates the stream handle 488 * associated with the returned object. Note that this in itself does not 489 * always guarantee that the reference returned by readUnshared is unique; 490 * the deserialized object may define a readResolve method which returns an 491 * object visible to other parties, or readUnshared may return a Class 492 * object or enum constant obtainable elsewhere in the stream or through 493 * external means. If the deserialized object defines a readResolve method 494 * and the invocation of that method returns an array, then readUnshared 495 * returns a shallow clone of that array; this guarantees that the returned 496 * array object is unique and cannot be obtained a second time from an 497 * invocation of readObject or readUnshared on the ObjectInputStream, 498 * even if the underlying data stream has been manipulated. 499 * 500 * <p>The serialization filter, when not {@code null}, is invoked for 501 * each object (regular or class) read to reconstruct the root object. 502 * See {@link #setObjectInputFilter(ObjectInputFilter) setObjectInputFilter} for details. 503 * 504 * <p>ObjectInputStream subclasses which override this method can only be 505 * constructed in security contexts possessing the 506 * "enableSubclassImplementation" SerializablePermission; any attempt to 507 * instantiate such a subclass without this permission will cause a 508 * SecurityException to be thrown. 509 * 510 * @return reference to deserialized object 511 * @throws ClassNotFoundException if class of an object to deserialize 512 * cannot be found 513 * @throws StreamCorruptedException if control information in the stream 514 * is inconsistent 515 * @throws ObjectStreamException if object to deserialize has already 516 * appeared in stream 517 * @throws OptionalDataException if primitive data is next in stream 518 * @throws IOException if an I/O error occurs during deserialization 519 * @since 1.4 520 */ 521 public Object readUnshared() throws IOException, ClassNotFoundException { 522 // if nested read, passHandle contains handle of enclosing object 523 int outerHandle = passHandle; 524 try { 525 Object obj = readObject0(true); 526 handles.markDependency(outerHandle, passHandle); 527 ClassNotFoundException ex = handles.lookupException(passHandle); 528 if (ex != null) { 529 throw ex; 530 } 531 if (depth == 0) { 532 vlist.doCallbacks(); 533 freeze(); 534 } 535 return obj; 536 } finally { 537 passHandle = outerHandle; 538 if (closed && depth == 0) { 539 clear(); 540 } 541 } 542 } 543 544 /** 545 * Read the non-static and non-transient fields of the current class from 546 * this stream. This may only be called from the readObject method of the 547 * class being deserialized. It will throw the NotActiveException if it is 548 * called otherwise. 549 * 550 * @throws ClassNotFoundException if the class of a serialized object 551 * could not be found. 552 * @throws IOException if an I/O error occurs. 553 * @throws NotActiveException if the stream is not currently reading 554 * objects. 555 */ 556 public void defaultReadObject() 557 throws IOException, ClassNotFoundException 558 { 559 SerialCallbackContext ctx = curContext; 560 if (ctx == null) { 561 throw new NotActiveException("not in call to readObject"); 562 } 563 Object curObj = ctx.getObj(); 564 ObjectStreamClass curDesc = ctx.getDesc(); 565 bin.setBlockDataMode(false); 566 FieldValues vals = defaultReadFields(curObj, curDesc); 567 if (curObj != null) { 568 defaultCheckFieldValues(curObj, curDesc, vals); 569 defaultSetFieldValues(curObj, curDesc, vals); 570 } 571 bin.setBlockDataMode(true); 572 if (!curDesc.hasWriteObjectData()) { 573 /* 574 * Fix for 4360508: since stream does not contain terminating 575 * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere 576 * knows to simulate end-of-custom-data behavior. 577 */ 578 defaultDataEnd = true; 579 } 580 ClassNotFoundException ex = handles.lookupException(passHandle); 581 if (ex != null) { 582 throw ex; 583 } 584 } 585 586 /** 587 * Reads the persistent fields from the stream and makes them available by 588 * name. 589 * 590 * @return the <code>GetField</code> object representing the persistent 591 * fields of the object being deserialized 592 * @throws ClassNotFoundException if the class of a serialized object 593 * could not be found. 594 * @throws IOException if an I/O error occurs. 595 * @throws NotActiveException if the stream is not currently reading 596 * objects. 597 * @since 1.2 598 */ 599 public ObjectInputStream.GetField readFields() 600 throws IOException, ClassNotFoundException 601 { 602 SerialCallbackContext ctx = curContext; 603 if (ctx == null) { 604 throw new NotActiveException("not in call to readObject"); 605 } 606 ctx.checkAndSetUsed(); 607 ObjectStreamClass curDesc = ctx.getDesc(); 608 bin.setBlockDataMode(false); 609 GetFieldImpl getField = new GetFieldImpl(curDesc); 610 getField.readFields(); 611 bin.setBlockDataMode(true); 612 if (!curDesc.hasWriteObjectData()) { 613 /* 614 * Fix for 4360508: since stream does not contain terminating 615 * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere 616 * knows to simulate end-of-custom-data behavior. 617 */ 618 defaultDataEnd = true; 619 } 620 621 return getField; 622 } 623 624 /** 625 * Register an object to be validated before the graph is returned. While 626 * similar to resolveObject these validations are called after the entire 627 * graph has been reconstituted. Typically, a readObject method will 628 * register the object with the stream so that when all of the objects are 629 * restored a final set of validations can be performed. 630 * 631 * @param obj the object to receive the validation callback. 632 * @param prio controls the order of callbacks;zero is a good default. 633 * Use higher numbers to be called back earlier, lower numbers for 634 * later callbacks. Within a priority, callbacks are processed in 635 * no particular order. 636 * @throws NotActiveException The stream is not currently reading objects 637 * so it is invalid to register a callback. 638 * @throws InvalidObjectException The validation object is null. 639 */ 640 public void registerValidation(ObjectInputValidation obj, int prio) 641 throws NotActiveException, InvalidObjectException 642 { 643 if (depth == 0) { 644 throw new NotActiveException("stream inactive"); 645 } 646 vlist.register(obj, prio); 647 } 648 649 /** 650 * Load the local class equivalent of the specified stream class 651 * description. Subclasses may implement this method to allow classes to 652 * be fetched from an alternate source. 653 * 654 * <p>The corresponding method in <code>ObjectOutputStream</code> is 655 * <code>annotateClass</code>. This method will be invoked only once for 656 * each unique class in the stream. This method can be implemented by 657 * subclasses to use an alternate loading mechanism but must return a 658 * <code>Class</code> object. Once returned, if the class is not an array 659 * class, its serialVersionUID is compared to the serialVersionUID of the 660 * serialized class, and if there is a mismatch, the deserialization fails 661 * and an {@link InvalidClassException} is thrown. 662 * 663 * <p>The default implementation of this method in 664 * <code>ObjectInputStream</code> returns the result of calling 665 * <pre> 666 * Class.forName(desc.getName(), false, loader) 667 * </pre> 668 * where <code>loader</code> is the first class loader on the current 669 * thread's stack (starting from the currently executing method) that is 670 * neither the {@linkplain ClassLoader#getPlatformClassLoader() platform 671 * class loader} nor its ancestor; otherwise, <code>loader</code> is the 672 * <em>platform class loader</em>. If this call results in a 673 * <code>ClassNotFoundException</code> and the name of the passed 674 * <code>ObjectStreamClass</code> instance is the Java language keyword 675 * for a primitive type or void, then the <code>Class</code> object 676 * representing that primitive type or void will be returned 677 * (e.g., an <code>ObjectStreamClass</code> with the name 678 * <code>"int"</code> will be resolved to <code>Integer.TYPE</code>). 679 * Otherwise, the <code>ClassNotFoundException</code> will be thrown to 680 * the caller of this method. 681 * 682 * @param desc an instance of class <code>ObjectStreamClass</code> 683 * @return a <code>Class</code> object corresponding to <code>desc</code> 684 * @throws IOException any of the usual Input/Output exceptions. 685 * @throws ClassNotFoundException if class of a serialized object cannot 686 * be found. 687 */ 688 protected Class<?> resolveClass(ObjectStreamClass desc) 689 throws IOException, ClassNotFoundException 690 { 691 String name = desc.getName(); 692 try { 693 return Class.forName(name, false, latestUserDefinedLoader()); 694 } catch (ClassNotFoundException ex) { 695 Class<?> cl = primClasses.get(name); 696 if (cl != null) { 697 return cl; 698 } else { 699 throw ex; 700 } 701 } 702 } 703 704 /** 705 * Returns a proxy class that implements the interfaces named in a proxy 706 * class descriptor; subclasses may implement this method to read custom 707 * data from the stream along with the descriptors for dynamic proxy 708 * classes, allowing them to use an alternate loading mechanism for the 709 * interfaces and the proxy class. 710 * 711 * <p>This method is called exactly once for each unique proxy class 712 * descriptor in the stream. 713 * 714 * <p>The corresponding method in <code>ObjectOutputStream</code> is 715 * <code>annotateProxyClass</code>. For a given subclass of 716 * <code>ObjectInputStream</code> that overrides this method, the 717 * <code>annotateProxyClass</code> method in the corresponding subclass of 718 * <code>ObjectOutputStream</code> must write any data or objects read by 719 * this method. 720 * 721 * <p>The default implementation of this method in 722 * <code>ObjectInputStream</code> returns the result of calling 723 * <code>Proxy.getProxyClass</code> with the list of <code>Class</code> 724 * objects for the interfaces that are named in the <code>interfaces</code> 725 * parameter. The <code>Class</code> object for each interface name 726 * <code>i</code> is the value returned by calling 727 * <pre> 728 * Class.forName(i, false, loader) 729 * </pre> 730 * where <code>loader</code> is the first class loader on the current 731 * thread's stack (starting from the currently executing method) that is 732 * neither the {@linkplain ClassLoader#getPlatformClassLoader() platform 733 * class loader} nor its ancestor; otherwise, <code>loader</code> is the 734 * <em>platform class loader</em>. 735 * Unless any of the resolved interfaces are non-public, this same value 736 * of <code>loader</code> is also the class loader passed to 737 * <code>Proxy.getProxyClass</code>; if non-public interfaces are present, 738 * their class loader is passed instead (if more than one non-public 739 * interface class loader is encountered, an 740 * <code>IllegalAccessError</code> is thrown). 741 * If <code>Proxy.getProxyClass</code> throws an 742 * <code>IllegalArgumentException</code>, <code>resolveProxyClass</code> 743 * will throw a <code>ClassNotFoundException</code> containing the 744 * <code>IllegalArgumentException</code>. 745 * 746 * @param interfaces the list of interface names that were 747 * deserialized in the proxy class descriptor 748 * @return a proxy class for the specified interfaces 749 * @throws IOException any exception thrown by the underlying 750 * <code>InputStream</code> 751 * @throws ClassNotFoundException if the proxy class or any of the 752 * named interfaces could not be found 753 * @see ObjectOutputStream#annotateProxyClass(Class) 754 * @since 1.3 755 */ 756 protected Class<?> resolveProxyClass(String[] interfaces) 757 throws IOException, ClassNotFoundException 758 { 759 ClassLoader latestLoader = latestUserDefinedLoader(); 760 ClassLoader nonPublicLoader = null; 761 boolean hasNonPublicInterface = false; 762 763 // define proxy in class loader of non-public interface(s), if any 764 Class<?>[] classObjs = new Class<?>[interfaces.length]; 765 for (int i = 0; i < interfaces.length; i++) { 766 Class<?> cl = Class.forName(interfaces[i], false, latestLoader); 767 if ((cl.getModifiers() & Modifier.PUBLIC) == 0) { 768 if (hasNonPublicInterface) { 769 if (nonPublicLoader != cl.getClassLoader()) { 770 throw new IllegalAccessError( 771 "conflicting non-public interface class loaders"); 772 } 773 } else { 774 nonPublicLoader = cl.getClassLoader(); 775 hasNonPublicInterface = true; 776 } 777 } 778 classObjs[i] = cl; 779 } 780 try { 781 @SuppressWarnings("deprecation") 782 Class<?> proxyClass = Proxy.getProxyClass( 783 hasNonPublicInterface ? nonPublicLoader : latestLoader, 784 classObjs); 785 return proxyClass; 786 } catch (IllegalArgumentException e) { 787 throw new ClassNotFoundException(null, e); 788 } 789 } 790 791 /** 792 * This method will allow trusted subclasses of ObjectInputStream to 793 * substitute one object for another during deserialization. Replacing 794 * objects is disabled until enableResolveObject is called. The 795 * enableResolveObject method checks that the stream requesting to resolve 796 * object can be trusted. Every reference to serializable objects is passed 797 * to resolveObject. To insure that the private state of objects is not 798 * unintentionally exposed only trusted streams may use resolveObject. 799 * 800 * <p>This method is called after an object has been read but before it is 801 * returned from readObject. The default resolveObject method just returns 802 * the same object. 803 * 804 * <p>When a subclass is replacing objects it must insure that the 805 * substituted object is compatible with every field where the reference 806 * will be stored. Objects whose type is not a subclass of the type of the 807 * field or array element abort the serialization by raising an exception 808 * and the object is not be stored. 809 * 810 * <p>This method is called only once when each object is first 811 * encountered. All subsequent references to the object will be redirected 812 * to the new object. 813 * 814 * @param obj object to be substituted 815 * @return the substituted object 816 * @throws IOException Any of the usual Input/Output exceptions. 817 */ 818 protected Object resolveObject(Object obj) throws IOException { 819 return obj; 820 } 821 822 /** 823 * Enables the stream to do replacement of objects read from the stream. When 824 * enabled, the {@link #resolveObject} method is called for every object being 825 * deserialized. 826 * 827 * <p>If object replacement is currently not enabled, and 828 * {@code enable} is true, and there is a security manager installed, 829 * this method first calls the security manager's 830 * {@code checkPermission} method with the 831 * {@code SerializablePermission("enableSubstitution")} permission to 832 * ensure that the caller is permitted to enable the stream to do replacement 833 * of objects read from the stream. 834 * 835 * @param enable true for enabling use of {@code resolveObject} for 836 * every object being deserialized 837 * @return the previous setting before this method was invoked 838 * @throws SecurityException if a security manager exists and its 839 * {@code checkPermission} method denies enabling the stream 840 * to do replacement of objects read from the stream. 841 * @see SecurityManager#checkPermission 842 * @see java.io.SerializablePermission 843 */ 844 protected boolean enableResolveObject(boolean enable) 845 throws SecurityException 846 { 847 if (enable == enableResolve) { 848 return enable; 849 } 850 if (enable) { 851 SecurityManager sm = System.getSecurityManager(); 852 if (sm != null) { 853 sm.checkPermission(SUBSTITUTION_PERMISSION); 854 } 855 } 856 enableResolve = enable; 857 return !enableResolve; 858 } 859 860 /** 861 * The readStreamHeader method is provided to allow subclasses to read and 862 * verify their own stream headers. It reads and verifies the magic number 863 * and version number. 864 * 865 * @throws IOException if there are I/O errors while reading from the 866 * underlying <code>InputStream</code> 867 * @throws StreamCorruptedException if control information in the stream 868 * is inconsistent 869 */ 870 protected void readStreamHeader() 871 throws IOException, StreamCorruptedException 872 { 873 short s0 = bin.readShort(); 874 short s1 = bin.readShort(); 875 if (s0 != STREAM_MAGIC || s1 != STREAM_VERSION) { 876 throw new StreamCorruptedException( 877 String.format("invalid stream header: %04X%04X", s0, s1)); 878 } 879 } 880 881 /** 882 * Read a class descriptor from the serialization stream. This method is 883 * called when the ObjectInputStream expects a class descriptor as the next 884 * item in the serialization stream. Subclasses of ObjectInputStream may 885 * override this method to read in class descriptors that have been written 886 * in non-standard formats (by subclasses of ObjectOutputStream which have 887 * overridden the <code>writeClassDescriptor</code> method). By default, 888 * this method reads class descriptors according to the format defined in 889 * the Object Serialization specification. 890 * 891 * @return the class descriptor read 892 * @throws IOException If an I/O error has occurred. 893 * @throws ClassNotFoundException If the Class of a serialized object used 894 * in the class descriptor representation cannot be found 895 * @see java.io.ObjectOutputStream#writeClassDescriptor(java.io.ObjectStreamClass) 896 * @since 1.3 897 */ 898 protected ObjectStreamClass readClassDescriptor() 899 throws IOException, ClassNotFoundException 900 { 901 ObjectStreamClass desc = new ObjectStreamClass(); 902 desc.readNonProxy(this); 903 return desc; 904 } 905 906 /** 907 * Reads a byte of data. This method will block if no input is available. 908 * 909 * @return the byte read, or -1 if the end of the stream is reached. 910 * @throws IOException If an I/O error has occurred. 911 */ 912 public int read() throws IOException { 913 return bin.read(); 914 } 915 916 /** 917 * Reads into an array of bytes. This method will block until some input 918 * is available. Consider using java.io.DataInputStream.readFully to read 919 * exactly 'length' bytes. 920 * 921 * @param buf the buffer into which the data is read 922 * @param off the start offset in the destination array {@code buf} 923 * @param len the maximum number of bytes read 924 * @return the actual number of bytes read, -1 is returned when the end of 925 * the stream is reached. 926 * @throws NullPointerException if {@code buf} is {@code null}. 927 * @throws IndexOutOfBoundsException if {@code off} is negative, 928 * {@code len} is negative, or {@code len} is greater than 929 * {@code buf.length - off}. 930 * @throws IOException If an I/O error has occurred. 931 * @see java.io.DataInputStream#readFully(byte[],int,int) 932 */ 933 public int read(byte[] buf, int off, int len) throws IOException { 934 if (buf == null) { 935 throw new NullPointerException(); 936 } 937 int endoff = off + len; 938 if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) { 939 throw new IndexOutOfBoundsException(); 940 } 941 return bin.read(buf, off, len, false); 942 } 943 944 /** 945 * Returns the number of bytes that can be read without blocking. 946 * 947 * @return the number of available bytes. 948 * @throws IOException if there are I/O errors while reading from the 949 * underlying <code>InputStream</code> 950 */ 951 public int available() throws IOException { 952 return bin.available(); 953 } 954 955 /** 956 * Closes the input stream. Must be called to release any resources 957 * associated with the stream. 958 * 959 * @throws IOException If an I/O error has occurred. 960 */ 961 public void close() throws IOException { 962 /* 963 * Even if stream already closed, propagate redundant close to 964 * underlying stream to stay consistent with previous implementations. 965 */ 966 closed = true; 967 if (depth == 0) { 968 clear(); 969 } 970 bin.close(); 971 } 972 973 /** 974 * Reads in a boolean. 975 * 976 * @return the boolean read. 977 * @throws EOFException If end of file is reached. 978 * @throws IOException If other I/O error has occurred. 979 */ 980 public boolean readBoolean() throws IOException { 981 return bin.readBoolean(); 982 } 983 984 /** 985 * Reads an 8 bit byte. 986 * 987 * @return the 8 bit byte read. 988 * @throws EOFException If end of file is reached. 989 * @throws IOException If other I/O error has occurred. 990 */ 991 public byte readByte() throws IOException { 992 return bin.readByte(); 993 } 994 995 /** 996 * Reads an unsigned 8 bit byte. 997 * 998 * @return the 8 bit byte read. 999 * @throws EOFException If end of file is reached. 1000 * @throws IOException If other I/O error has occurred. 1001 */ 1002 public int readUnsignedByte() throws IOException { 1003 return bin.readUnsignedByte(); 1004 } 1005 1006 /** 1007 * Reads a 16 bit char. 1008 * 1009 * @return the 16 bit char read. 1010 * @throws EOFException If end of file is reached. 1011 * @throws IOException If other I/O error has occurred. 1012 */ 1013 public char readChar() throws IOException { 1014 return bin.readChar(); 1015 } 1016 1017 /** 1018 * Reads a 16 bit short. 1019 * 1020 * @return the 16 bit short read. 1021 * @throws EOFException If end of file is reached. 1022 * @throws IOException If other I/O error has occurred. 1023 */ 1024 public short readShort() throws IOException { 1025 return bin.readShort(); 1026 } 1027 1028 /** 1029 * Reads an unsigned 16 bit short. 1030 * 1031 * @return the 16 bit short read. 1032 * @throws EOFException If end of file is reached. 1033 * @throws IOException If other I/O error has occurred. 1034 */ 1035 public int readUnsignedShort() throws IOException { 1036 return bin.readUnsignedShort(); 1037 } 1038 1039 /** 1040 * Reads a 32 bit int. 1041 * 1042 * @return the 32 bit integer read. 1043 * @throws EOFException If end of file is reached. 1044 * @throws IOException If other I/O error has occurred. 1045 */ 1046 public int readInt() throws IOException { 1047 return bin.readInt(); 1048 } 1049 1050 /** 1051 * Reads a 64 bit long. 1052 * 1053 * @return the read 64 bit long. 1054 * @throws EOFException If end of file is reached. 1055 * @throws IOException If other I/O error has occurred. 1056 */ 1057 public long readLong() throws IOException { 1058 return bin.readLong(); 1059 } 1060 1061 /** 1062 * Reads a 32 bit float. 1063 * 1064 * @return the 32 bit float read. 1065 * @throws EOFException If end of file is reached. 1066 * @throws IOException If other I/O error has occurred. 1067 */ 1068 public float readFloat() throws IOException { 1069 return bin.readFloat(); 1070 } 1071 1072 /** 1073 * Reads a 64 bit double. 1074 * 1075 * @return the 64 bit double read. 1076 * @throws EOFException If end of file is reached. 1077 * @throws IOException If other I/O error has occurred. 1078 */ 1079 public double readDouble() throws IOException { 1080 return bin.readDouble(); 1081 } 1082 1083 /** 1084 * Reads bytes, blocking until all bytes are read. 1085 * 1086 * @param buf the buffer into which the data is read 1087 * @throws NullPointerException If {@code buf} is {@code null}. 1088 * @throws EOFException If end of file is reached. 1089 * @throws IOException If other I/O error has occurred. 1090 */ 1091 public void readFully(byte[] buf) throws IOException { 1092 bin.readFully(buf, 0, buf.length, false); 1093 } 1094 1095 /** 1096 * Reads bytes, blocking until all bytes are read. 1097 * 1098 * @param buf the buffer into which the data is read 1099 * @param off the start offset into the data array {@code buf} 1100 * @param len the maximum number of bytes to read 1101 * @throws NullPointerException If {@code buf} is {@code null}. 1102 * @throws IndexOutOfBoundsException If {@code off} is negative, 1103 * {@code len} is negative, or {@code len} is greater than 1104 * {@code buf.length - off}. 1105 * @throws EOFException If end of file is reached. 1106 * @throws IOException If other I/O error has occurred. 1107 */ 1108 public void readFully(byte[] buf, int off, int len) throws IOException { 1109 int endoff = off + len; 1110 if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) { 1111 throw new IndexOutOfBoundsException(); 1112 } 1113 bin.readFully(buf, off, len, false); 1114 } 1115 1116 /** 1117 * Skips bytes. 1118 * 1119 * @param len the number of bytes to be skipped 1120 * @return the actual number of bytes skipped. 1121 * @throws IOException If an I/O error has occurred. 1122 */ 1123 public int skipBytes(int len) throws IOException { 1124 return bin.skipBytes(len); 1125 } 1126 1127 /** 1128 * Reads in a line that has been terminated by a \n, \r, \r\n or EOF. 1129 * 1130 * @return a String copy of the line. 1131 * @throws IOException if there are I/O errors while reading from the 1132 * underlying <code>InputStream</code> 1133 * @deprecated This method does not properly convert bytes to characters. 1134 * see DataInputStream for the details and alternatives. 1135 */ 1136 @Deprecated 1137 public String readLine() throws IOException { 1138 return bin.readLine(); 1139 } 1140 1141 /** 1142 * Reads a String in 1143 * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 1144 * format. 1145 * 1146 * @return the String. 1147 * @throws IOException if there are I/O errors while reading from the 1148 * underlying <code>InputStream</code> 1149 * @throws UTFDataFormatException if read bytes do not represent a valid 1150 * modified UTF-8 encoding of a string 1151 */ 1152 public String readUTF() throws IOException { 1153 return bin.readUTF(); 1154 } 1155 1156 /** 1157 * Returns the serialization filter for this stream. 1158 * The serialization filter is the most recent filter set in 1159 * {@link #setObjectInputFilter setObjectInputFilter} or 1160 * the initial system-wide filter from 1161 * {@link ObjectInputFilter.Config#getSerialFilter() ObjectInputFilter.Config.getSerialFilter}. 1162 * 1163 * @return the serialization filter for the stream; may be null 1164 * @since 9 1165 */ 1166 public final ObjectInputFilter getObjectInputFilter() { 1167 return serialFilter; 1168 } 1169 1170 /** 1171 * Set the serialization filter for the stream. 1172 * The filter's {@link ObjectInputFilter#checkInput checkInput} method is called 1173 * for each class and reference in the stream. 1174 * The filter can check any or all of the class, the array length, the number 1175 * of references, the depth of the graph, and the size of the input stream. 1176 * The depth is the number of nested {@linkplain #readObject readObject} 1177 * calls starting with the reading of the root of the graph being deserialized 1178 * and the current object being deserialized. 1179 * The number of references is the cumulative number of objects and references 1180 * to objects already read from the stream including the current object being read. 1181 * The filter is invoked only when reading objects from the stream and for 1182 * not primitives. 1183 * <p> 1184 * If the filter returns {@link ObjectInputFilter.Status#REJECTED Status.REJECTED}, 1185 * {@code null} or throws a {@link RuntimeException}, 1186 * the active {@code readObject} or {@code readUnshared} 1187 * throws {@link InvalidClassException}, otherwise deserialization 1188 * continues uninterrupted. 1189 * <p> 1190 * The serialization filter is initialized to the value of 1191 * {@link ObjectInputFilter.Config#getSerialFilter() ObjectInputFilter.Config.getSerialFilter} 1192 * when the {@code ObjectInputStream} is constructed and can be set 1193 * to a custom filter only once. 1194 * 1195 * @implSpec 1196 * The filter, when not {@code null}, is invoked during {@link #readObject readObject} 1197 * and {@link #readUnshared readUnshared} for each object (regular or class) in the stream. 1198 * Strings are treated as primitives and do not invoke the filter. 1199 * The filter is called for: 1200 * <ul> 1201 * <li>each object reference previously deserialized from the stream 1202 * (class is {@code null}, arrayLength is -1), 1203 * <li>each regular class (class is not {@code null}, arrayLength is -1), 1204 * <li>each interface of a dynamic proxy and the dynamic proxy class itself 1205 * (class is not {@code null}, arrayLength is -1), 1206 * <li>each array is filtered using the array type and length of the array 1207 * (class is the array type, arrayLength is the requested length), 1208 * <li>each object replaced by its class' {@code readResolve} method 1209 * is filtered using the replacement object's class, if not {@code null}, 1210 * and if it is an array, the arrayLength, otherwise -1, 1211 * <li>and each object replaced by {@link #resolveObject resolveObject} 1212 * is filtered using the replacement object's class, if not {@code null}, 1213 * and if it is an array, the arrayLength, otherwise -1. 1214 * </ul> 1215 * 1216 * When the {@link ObjectInputFilter#checkInput checkInput} method is invoked 1217 * it is given access to the current class, the array length, 1218 * the current number of references already read from the stream, 1219 * the depth of nested calls to {@link #readObject readObject} or 1220 * {@link #readUnshared readUnshared}, 1221 * and the implementation dependent number of bytes consumed from the input stream. 1222 * <p> 1223 * Each call to {@link #readObject readObject} or 1224 * {@link #readUnshared readUnshared} increases the depth by 1 1225 * before reading an object and decreases by 1 before returning 1226 * normally or exceptionally. 1227 * The depth starts at {@code 1} and increases for each nested object and 1228 * decrements when each nested call returns. 1229 * The count of references in the stream starts at {@code 1} and 1230 * is increased before reading an object. 1231 * 1232 * @param filter the filter, may be null 1233 * @throws SecurityException if there is security manager and the 1234 * {@code SerializablePermission("serialFilter")} is not granted 1235 * @throws IllegalStateException if the {@linkplain #getObjectInputFilter() current filter} 1236 * is not {@code null} and is not the system-wide filter 1237 * @since 9 1238 */ 1239 public final void setObjectInputFilter(ObjectInputFilter filter) { 1240 SecurityManager sm = System.getSecurityManager(); 1241 if (sm != null) { 1242 sm.checkPermission(ObjectStreamConstants.SERIAL_FILTER_PERMISSION); 1243 } 1244 // Allow replacement of the system-wide filter if not already set 1245 if (serialFilter != null && 1246 serialFilter != ObjectInputFilter.Config.getSerialFilter()) { 1247 throw new IllegalStateException("filter can not be set more than once"); 1248 } 1249 this.serialFilter = filter; 1250 } 1251 1252 /** 1253 * Invoke the serialization filter if non-null. 1254 * If the filter rejects or an exception is thrown, throws InvalidClassException. 1255 * 1256 * @param clazz the class; may be null 1257 * @param arrayLength the array length requested; use {@code -1} if not creating an array 1258 * @throws InvalidClassException if it rejected by the filter or 1259 * a {@link RuntimeException} is thrown 1260 */ 1261 private void filterCheck(Class<?> clazz, int arrayLength) 1262 throws InvalidClassException { 1263 if (serialFilter != null) { 1264 RuntimeException ex = null; 1265 ObjectInputFilter.Status status; 1266 // Info about the stream is not available if overridden by subclass, return 0 1267 long bytesRead = (bin == null) ? 0 : bin.getBytesRead(); 1268 try { 1269 status = serialFilter.checkInput(new FilterValues(clazz, arrayLength, 1270 totalObjectRefs, depth, bytesRead)); 1271 } catch (RuntimeException e) { 1272 // Preventive interception of an exception to log 1273 status = ObjectInputFilter.Status.REJECTED; 1274 ex = e; 1275 } 1276 if (Logging.filterLogger != null) { 1277 // Debug logging of filter checks that fail; Tracing for those that succeed 1278 Logging.filterLogger.log(status == null || status == ObjectInputFilter.Status.REJECTED 1279 ? Logger.Level.DEBUG 1280 : Logger.Level.TRACE, 1281 "ObjectInputFilter {0}: {1}, array length: {2}, nRefs: {3}, depth: {4}, bytes: {5}, ex: {6}", 1282 status, clazz, arrayLength, totalObjectRefs, depth, bytesRead, 1283 Objects.toString(ex, "n/a")); 1284 } 1285 if (status == null || 1286 status == ObjectInputFilter.Status.REJECTED) { 1287 InvalidClassException ice = new InvalidClassException("filter status: " + status); 1288 ice.initCause(ex); 1289 throw ice; 1290 } 1291 } 1292 } 1293 1294 /** 1295 * Checks the given array type and length to ensure that creation of such 1296 * an array is permitted by this ObjectInputStream. The arrayType argument 1297 * must represent an actual array type. 1298 * 1299 * This private method is called via SharedSecrets. 1300 * 1301 * @param arrayType the array type 1302 * @param arrayLength the array length 1303 * @throws NullPointerException if arrayType is null 1304 * @throws IllegalArgumentException if arrayType isn't actually an array type 1305 * @throws NegativeArraySizeException if arrayLength is negative 1306 * @throws InvalidClassException if the filter rejects creation 1307 */ 1308 private void checkArray(Class<?> arrayType, int arrayLength) throws InvalidClassException { 1309 if (! arrayType.isArray()) { 1310 throw new IllegalArgumentException("not an array type"); 1311 } 1312 1313 if (arrayLength < 0) { 1314 throw new NegativeArraySizeException(); 1315 } 1316 1317 filterCheck(arrayType, arrayLength); 1318 } 1319 1320 /** 1321 * Provide access to the persistent fields read from the input stream. 1322 */ 1323 public abstract static class GetField { 1324 /** 1325 * Constructor for subclasses to call. 1326 */ 1327 public GetField() {} 1328 1329 /** 1330 * Get the ObjectStreamClass that describes the fields in the stream. 1331 * 1332 * @return the descriptor class that describes the serializable fields 1333 */ 1334 public abstract ObjectStreamClass getObjectStreamClass(); 1335 1336 /** 1337 * Return true if the named field is defaulted and has no value in this 1338 * stream. 1339 * 1340 * @param name the name of the field 1341 * @return true, if and only if the named field is defaulted 1342 * @throws IOException if there are I/O errors while reading from 1343 * the underlying <code>InputStream</code> 1344 * @throws IllegalArgumentException if <code>name</code> does not 1345 * correspond to a serializable field 1346 */ 1347 public abstract boolean defaulted(String name) throws IOException; 1348 1349 /** 1350 * Get the value of the named boolean field from the persistent field. 1351 * 1352 * @param name the name of the field 1353 * @param val the default value to use if <code>name</code> does not 1354 * have a value 1355 * @return the value of the named <code>boolean</code> field 1356 * @throws IOException if there are I/O errors while reading from the 1357 * underlying <code>InputStream</code> 1358 * @throws IllegalArgumentException if type of <code>name</code> is 1359 * not serializable or if the field type is incorrect 1360 */ 1361 public abstract boolean get(String name, boolean val) 1362 throws IOException; 1363 1364 /** 1365 * Get the value of the named byte field from the persistent field. 1366 * 1367 * @param name the name of the field 1368 * @param val the default value to use if <code>name</code> does not 1369 * have a value 1370 * @return the value of the named <code>byte</code> field 1371 * @throws IOException if there are I/O errors while reading from the 1372 * underlying <code>InputStream</code> 1373 * @throws IllegalArgumentException if type of <code>name</code> is 1374 * not serializable or if the field type is incorrect 1375 */ 1376 public abstract byte get(String name, byte val) throws IOException; 1377 1378 /** 1379 * Get the value of the named char field from the persistent field. 1380 * 1381 * @param name the name of the field 1382 * @param val the default value to use if <code>name</code> does not 1383 * have a value 1384 * @return the value of the named <code>char</code> field 1385 * @throws IOException if there are I/O errors while reading from the 1386 * underlying <code>InputStream</code> 1387 * @throws IllegalArgumentException if type of <code>name</code> is 1388 * not serializable or if the field type is incorrect 1389 */ 1390 public abstract char get(String name, char val) throws IOException; 1391 1392 /** 1393 * Get the value of the named short field from the persistent field. 1394 * 1395 * @param name the name of the field 1396 * @param val the default value to use if <code>name</code> does not 1397 * have a value 1398 * @return the value of the named <code>short</code> field 1399 * @throws IOException if there are I/O errors while reading from the 1400 * underlying <code>InputStream</code> 1401 * @throws IllegalArgumentException if type of <code>name</code> is 1402 * not serializable or if the field type is incorrect 1403 */ 1404 public abstract short get(String name, short val) throws IOException; 1405 1406 /** 1407 * Get the value of the named int field from the persistent field. 1408 * 1409 * @param name the name of the field 1410 * @param val the default value to use if <code>name</code> does not 1411 * have a value 1412 * @return the value of the named <code>int</code> field 1413 * @throws IOException if there are I/O errors while reading from the 1414 * underlying <code>InputStream</code> 1415 * @throws IllegalArgumentException if type of <code>name</code> is 1416 * not serializable or if the field type is incorrect 1417 */ 1418 public abstract int get(String name, int val) throws IOException; 1419 1420 /** 1421 * Get the value of the named long field from the persistent field. 1422 * 1423 * @param name the name of the field 1424 * @param val the default value to use if <code>name</code> does not 1425 * have a value 1426 * @return the value of the named <code>long</code> field 1427 * @throws IOException if there are I/O errors while reading from the 1428 * underlying <code>InputStream</code> 1429 * @throws IllegalArgumentException if type of <code>name</code> is 1430 * not serializable or if the field type is incorrect 1431 */ 1432 public abstract long get(String name, long val) throws IOException; 1433 1434 /** 1435 * Get the value of the named float field from the persistent field. 1436 * 1437 * @param name the name of the field 1438 * @param val the default value to use if <code>name</code> does not 1439 * have a value 1440 * @return the value of the named <code>float</code> field 1441 * @throws IOException if there are I/O errors while reading from the 1442 * underlying <code>InputStream</code> 1443 * @throws IllegalArgumentException if type of <code>name</code> is 1444 * not serializable or if the field type is incorrect 1445 */ 1446 public abstract float get(String name, float val) throws IOException; 1447 1448 /** 1449 * Get the value of the named double field from the persistent field. 1450 * 1451 * @param name the name of the field 1452 * @param val the default value to use if <code>name</code> does not 1453 * have a value 1454 * @return the value of the named <code>double</code> field 1455 * @throws IOException if there are I/O errors while reading from the 1456 * underlying <code>InputStream</code> 1457 * @throws IllegalArgumentException if type of <code>name</code> is 1458 * not serializable or if the field type is incorrect 1459 */ 1460 public abstract double get(String name, double val) throws IOException; 1461 1462 /** 1463 * Get the value of the named Object field from the persistent field. 1464 * 1465 * @param name the name of the field 1466 * @param val the default value to use if <code>name</code> does not 1467 * have a value 1468 * @return the value of the named <code>Object</code> field 1469 * @throws IOException if there are I/O errors while reading from the 1470 * underlying <code>InputStream</code> 1471 * @throws IllegalArgumentException if type of <code>name</code> is 1472 * not serializable or if the field type is incorrect 1473 */ 1474 public abstract Object get(String name, Object val) throws IOException; 1475 } 1476 1477 /** 1478 * Verifies that this (possibly subclass) instance can be constructed 1479 * without violating security constraints: the subclass must not override 1480 * security-sensitive non-final methods, or else the 1481 * "enableSubclassImplementation" SerializablePermission is checked. 1482 */ 1483 private void verifySubclass() { 1484 Class<?> cl = getClass(); 1485 if (cl == ObjectInputStream.class) { 1486 return; 1487 } 1488 SecurityManager sm = System.getSecurityManager(); 1489 if (sm == null) { 1490 return; 1491 } 1492 processQueue(Caches.subclassAuditsQueue, Caches.subclassAudits); 1493 WeakClassKey key = new WeakClassKey(cl, Caches.subclassAuditsQueue); 1494 Boolean result = Caches.subclassAudits.get(key); 1495 if (result == null) { 1496 result = auditSubclass(cl); 1497 Caches.subclassAudits.putIfAbsent(key, result); 1498 } 1499 if (!result) { 1500 sm.checkPermission(SUBCLASS_IMPLEMENTATION_PERMISSION); 1501 } 1502 } 1503 1504 /** 1505 * Performs reflective checks on given subclass to verify that it doesn't 1506 * override security-sensitive non-final methods. Returns TRUE if subclass 1507 * is "safe", FALSE otherwise. 1508 */ 1509 private static Boolean auditSubclass(Class<?> subcl) { 1510 return AccessController.doPrivileged( 1511 new PrivilegedAction<Boolean>() { 1512 public Boolean run() { 1513 for (Class<?> cl = subcl; 1514 cl != ObjectInputStream.class; 1515 cl = cl.getSuperclass()) 1516 { 1517 try { 1518 cl.getDeclaredMethod( 1519 "readUnshared", (Class[]) null); 1520 return Boolean.FALSE; 1521 } catch (NoSuchMethodException ex) { 1522 } 1523 try { 1524 cl.getDeclaredMethod("readFields", (Class[]) null); 1525 return Boolean.FALSE; 1526 } catch (NoSuchMethodException ex) { 1527 } 1528 } 1529 return Boolean.TRUE; 1530 } 1531 } 1532 ); 1533 } 1534 1535 /** 1536 * Clears internal data structures. 1537 */ 1538 private void clear() { 1539 handles.clear(); 1540 vlist.clear(); 1541 } 1542 1543 /** 1544 * Underlying readObject implementation. 1545 */ 1546 private Object readObject0(boolean unshared) throws IOException { 1547 boolean oldMode = bin.getBlockDataMode(); 1548 if (oldMode) { 1549 int remain = bin.currentBlockRemaining(); 1550 if (remain > 0) { 1551 throw new OptionalDataException(remain); 1552 } else if (defaultDataEnd) { 1553 /* 1554 * Fix for 4360508: stream is currently at the end of a field 1555 * value block written via default serialization; since there 1556 * is no terminating TC_ENDBLOCKDATA tag, simulate 1557 * end-of-custom-data behavior explicitly. 1558 */ 1559 throw new OptionalDataException(true); 1560 } 1561 bin.setBlockDataMode(false); 1562 } 1563 1564 byte tc; 1565 while ((tc = bin.peekByte()) == TC_RESET) { 1566 bin.readByte(); 1567 handleReset(); 1568 } 1569 1570 depth++; 1571 totalObjectRefs++; 1572 try { 1573 switch (tc) { 1574 case TC_NULL: 1575 return readNull(); 1576 1577 case TC_REFERENCE: 1578 return readHandle(unshared); 1579 1580 case TC_CLASS: 1581 return readClass(unshared); 1582 1583 case TC_CLASSDESC: 1584 case TC_PROXYCLASSDESC: 1585 return readClassDesc(unshared); 1586 1587 case TC_STRING: 1588 case TC_LONGSTRING: 1589 return checkResolve(readString(unshared)); 1590 1591 case TC_ARRAY: 1592 return checkResolve(readArray(unshared)); 1593 1594 case TC_ENUM: 1595 return checkResolve(readEnum(unshared)); 1596 1597 case TC_OBJECT: 1598 return checkResolve(readOrdinaryObject(unshared)); 1599 1600 case TC_EXCEPTION: 1601 IOException ex = readFatalException(); 1602 throw new WriteAbortedException("writing aborted", ex); 1603 1604 case TC_BLOCKDATA: 1605 case TC_BLOCKDATALONG: 1606 if (oldMode) { 1607 bin.setBlockDataMode(true); 1608 bin.peek(); // force header read 1609 throw new OptionalDataException( 1610 bin.currentBlockRemaining()); 1611 } else { 1612 throw new StreamCorruptedException( 1613 "unexpected block data"); 1614 } 1615 1616 case TC_ENDBLOCKDATA: 1617 if (oldMode) { 1618 throw new OptionalDataException(true); 1619 } else { 1620 throw new StreamCorruptedException( 1621 "unexpected end of block data"); 1622 } 1623 1624 default: 1625 throw new StreamCorruptedException( 1626 String.format("invalid type code: %02X", tc)); 1627 } 1628 } finally { 1629 depth--; 1630 bin.setBlockDataMode(oldMode); 1631 } 1632 } 1633 1634 /** 1635 * If resolveObject has been enabled and given object does not have an 1636 * exception associated with it, calls resolveObject to determine 1637 * replacement for object, and updates handle table accordingly. Returns 1638 * replacement object, or echoes provided object if no replacement 1639 * occurred. Expects that passHandle is set to given object's handle prior 1640 * to calling this method. 1641 */ 1642 private Object checkResolve(Object obj) throws IOException { 1643 if (!enableResolve || handles.lookupException(passHandle) != null) { 1644 return obj; 1645 } 1646 Object rep = resolveObject(obj); 1647 if (rep != obj) { 1648 // The type of the original object has been filtered but resolveObject 1649 // may have replaced it; filter the replacement's type 1650 if (rep != null) { 1651 if (rep.getClass().isArray()) { 1652 filterCheck(rep.getClass(), Array.getLength(rep)); 1653 } else { 1654 filterCheck(rep.getClass(), -1); 1655 } 1656 } 1657 handles.setObject(passHandle, rep); 1658 } 1659 return rep; 1660 } 1661 1662 /** 1663 * Reads string without allowing it to be replaced in stream. Called from 1664 * within ObjectStreamClass.read(). 1665 */ 1666 String readTypeString() throws IOException { 1667 int oldHandle = passHandle; 1668 try { 1669 byte tc = bin.peekByte(); 1670 switch (tc) { 1671 case TC_NULL: 1672 return (String) readNull(); 1673 1674 case TC_REFERENCE: 1675 return (String) readHandle(false); 1676 1677 case TC_STRING: 1678 case TC_LONGSTRING: 1679 return readString(false); 1680 1681 default: 1682 throw new StreamCorruptedException( 1683 String.format("invalid type code: %02X", tc)); 1684 } 1685 } finally { 1686 passHandle = oldHandle; 1687 } 1688 } 1689 1690 /** 1691 * Reads in null code, sets passHandle to NULL_HANDLE and returns null. 1692 */ 1693 private Object readNull() throws IOException { 1694 if (bin.readByte() != TC_NULL) { 1695 throw new InternalError(); 1696 } 1697 passHandle = NULL_HANDLE; 1698 return null; 1699 } 1700 1701 /** 1702 * Reads in object handle, sets passHandle to the read handle, and returns 1703 * object associated with the handle. 1704 */ 1705 private Object readHandle(boolean unshared) throws IOException { 1706 if (bin.readByte() != TC_REFERENCE) { 1707 throw new InternalError(); 1708 } 1709 passHandle = bin.readInt() - baseWireHandle; 1710 if (passHandle < 0 || passHandle >= handles.size()) { 1711 throw new StreamCorruptedException( 1712 String.format("invalid handle value: %08X", passHandle + 1713 baseWireHandle)); 1714 } 1715 if (unshared) { 1716 // REMIND: what type of exception to throw here? 1717 throw new InvalidObjectException( 1718 "cannot read back reference as unshared"); 1719 } 1720 1721 Object obj = handles.lookupObject(passHandle); 1722 if (obj == unsharedMarker) { 1723 // REMIND: what type of exception to throw here? 1724 throw new InvalidObjectException( 1725 "cannot read back reference to unshared object"); 1726 } 1727 filterCheck(null, -1); // just a check for number of references, depth, no class 1728 return obj; 1729 } 1730 1731 /** 1732 * Reads in and returns class object. Sets passHandle to class object's 1733 * assigned handle. Returns null if class is unresolvable (in which case a 1734 * ClassNotFoundException will be associated with the class' handle in the 1735 * handle table). 1736 */ 1737 private Class<?> readClass(boolean unshared) throws IOException { 1738 if (bin.readByte() != TC_CLASS) { 1739 throw new InternalError(); 1740 } 1741 ObjectStreamClass desc = readClassDesc(false); 1742 Class<?> cl = desc.forClass(); 1743 passHandle = handles.assign(unshared ? unsharedMarker : cl); 1744 1745 ClassNotFoundException resolveEx = desc.getResolveException(); 1746 if (resolveEx != null) { 1747 handles.markException(passHandle, resolveEx); 1748 } 1749 1750 handles.finish(passHandle); 1751 return cl; 1752 } 1753 1754 /** 1755 * Reads in and returns (possibly null) class descriptor. Sets passHandle 1756 * to class descriptor's assigned handle. If class descriptor cannot be 1757 * resolved to a class in the local VM, a ClassNotFoundException is 1758 * associated with the class descriptor's handle. 1759 */ 1760 private ObjectStreamClass readClassDesc(boolean unshared) 1761 throws IOException 1762 { 1763 byte tc = bin.peekByte(); 1764 ObjectStreamClass descriptor; 1765 switch (tc) { 1766 case TC_NULL: 1767 descriptor = (ObjectStreamClass) readNull(); 1768 break; 1769 case TC_REFERENCE: 1770 descriptor = (ObjectStreamClass) readHandle(unshared); 1771 break; 1772 case TC_PROXYCLASSDESC: 1773 descriptor = readProxyDesc(unshared); 1774 break; 1775 case TC_CLASSDESC: 1776 descriptor = readNonProxyDesc(unshared); 1777 break; 1778 default: 1779 throw new StreamCorruptedException( 1780 String.format("invalid type code: %02X", tc)); 1781 } 1782 return descriptor; 1783 } 1784 1785 private boolean isCustomSubclass() { 1786 // Return true if this class is a custom subclass of ObjectInputStream 1787 return getClass().getClassLoader() 1788 != ObjectInputStream.class.getClassLoader(); 1789 } 1790 1791 /** 1792 * Reads in and returns class descriptor for a dynamic proxy class. Sets 1793 * passHandle to proxy class descriptor's assigned handle. If proxy class 1794 * descriptor cannot be resolved to a class in the local VM, a 1795 * ClassNotFoundException is associated with the descriptor's handle. 1796 */ 1797 private ObjectStreamClass readProxyDesc(boolean unshared) 1798 throws IOException 1799 { 1800 if (bin.readByte() != TC_PROXYCLASSDESC) { 1801 throw new InternalError(); 1802 } 1803 1804 ObjectStreamClass desc = new ObjectStreamClass(); 1805 int descHandle = handles.assign(unshared ? unsharedMarker : desc); 1806 passHandle = NULL_HANDLE; 1807 1808 int numIfaces = bin.readInt(); 1809 if (numIfaces > 65535) { 1810 throw new InvalidObjectException("interface limit exceeded: " 1811 + numIfaces); 1812 } 1813 String[] ifaces = new String[numIfaces]; 1814 for (int i = 0; i < numIfaces; i++) { 1815 ifaces[i] = bin.readUTF(); 1816 } 1817 1818 Class<?> cl = null; 1819 ClassNotFoundException resolveEx = null; 1820 bin.setBlockDataMode(true); 1821 try { 1822 if ((cl = resolveProxyClass(ifaces)) == null) { 1823 resolveEx = new ClassNotFoundException("null class"); 1824 } else if (!Proxy.isProxyClass(cl)) { 1825 throw new InvalidClassException("Not a proxy"); 1826 } else { 1827 // ReflectUtil.checkProxyPackageAccess makes a test 1828 // equivalent to isCustomSubclass so there's no need 1829 // to condition this call to isCustomSubclass == true here. 1830 ReflectUtil.checkProxyPackageAccess( 1831 getClass().getClassLoader(), 1832 cl.getInterfaces()); 1833 // Filter the interfaces 1834 for (Class<?> clazz : cl.getInterfaces()) { 1835 filterCheck(clazz, -1); 1836 } 1837 } 1838 } catch (ClassNotFoundException ex) { 1839 resolveEx = ex; 1840 } 1841 1842 // Call filterCheck on the class before reading anything else 1843 filterCheck(cl, -1); 1844 1845 skipCustomData(); 1846 1847 try { 1848 totalObjectRefs++; 1849 depth++; 1850 desc.initProxy(cl, resolveEx, readClassDesc(false)); 1851 } finally { 1852 depth--; 1853 } 1854 1855 handles.finish(descHandle); 1856 passHandle = descHandle; 1857 return desc; 1858 } 1859 1860 /** 1861 * Reads in and returns class descriptor for a class that is not a dynamic 1862 * proxy class. Sets passHandle to class descriptor's assigned handle. If 1863 * class descriptor cannot be resolved to a class in the local VM, a 1864 * ClassNotFoundException is associated with the descriptor's handle. 1865 */ 1866 private ObjectStreamClass readNonProxyDesc(boolean unshared) 1867 throws IOException 1868 { 1869 if (bin.readByte() != TC_CLASSDESC) { 1870 throw new InternalError(); 1871 } 1872 1873 ObjectStreamClass desc = new ObjectStreamClass(); 1874 int descHandle = handles.assign(unshared ? unsharedMarker : desc); 1875 passHandle = NULL_HANDLE; 1876 1877 ObjectStreamClass readDesc; 1878 try { 1879 readDesc = readClassDescriptor(); 1880 } catch (ClassNotFoundException ex) { 1881 throw (IOException) new InvalidClassException( 1882 "failed to read class descriptor").initCause(ex); 1883 } 1884 1885 Class<?> cl = null; 1886 ClassNotFoundException resolveEx = null; 1887 bin.setBlockDataMode(true); 1888 final boolean checksRequired = isCustomSubclass(); 1889 try { 1890 if ((cl = resolveClass(readDesc)) == null) { 1891 resolveEx = new ClassNotFoundException("null class"); 1892 } else if (checksRequired) { 1893 ReflectUtil.checkPackageAccess(cl); 1894 } 1895 } catch (ClassNotFoundException ex) { 1896 resolveEx = ex; 1897 } 1898 1899 // Call filterCheck on the class before reading anything else 1900 filterCheck(cl, -1); 1901 1902 skipCustomData(); 1903 1904 try { 1905 totalObjectRefs++; 1906 depth++; 1907 desc.initNonProxy(readDesc, cl, resolveEx, readClassDesc(false)); 1908 } finally { 1909 depth--; 1910 } 1911 1912 handles.finish(descHandle); 1913 passHandle = descHandle; 1914 1915 return desc; 1916 } 1917 1918 /** 1919 * Reads in and returns new string. Sets passHandle to new string's 1920 * assigned handle. 1921 */ 1922 private String readString(boolean unshared) throws IOException { 1923 String str; 1924 byte tc = bin.readByte(); 1925 switch (tc) { 1926 case TC_STRING: 1927 str = bin.readUTF(); 1928 break; 1929 1930 case TC_LONGSTRING: 1931 str = bin.readLongUTF(); 1932 break; 1933 1934 default: 1935 throw new StreamCorruptedException( 1936 String.format("invalid type code: %02X", tc)); 1937 } 1938 passHandle = handles.assign(unshared ? unsharedMarker : str); 1939 handles.finish(passHandle); 1940 return str; 1941 } 1942 1943 /** 1944 * Reads in and returns array object, or null if array class is 1945 * unresolvable. Sets passHandle to array's assigned handle. 1946 */ 1947 private Object readArray(boolean unshared) throws IOException { 1948 if (bin.readByte() != TC_ARRAY) { 1949 throw new InternalError(); 1950 } 1951 1952 ObjectStreamClass desc = readClassDesc(false); 1953 int len = bin.readInt(); 1954 1955 filterCheck(desc.forClass(), len); 1956 1957 Object array = null; 1958 Class<?> cl, ccl = null; 1959 if ((cl = desc.forClass()) != null) { 1960 ccl = cl.getComponentType(); 1961 array = Array.newInstance(ccl, len); 1962 } 1963 1964 int arrayHandle = handles.assign(unshared ? unsharedMarker : array); 1965 ClassNotFoundException resolveEx = desc.getResolveException(); 1966 if (resolveEx != null) { 1967 handles.markException(arrayHandle, resolveEx); 1968 } 1969 1970 if (ccl == null) { 1971 for (int i = 0; i < len; i++) { 1972 readObject0(false); 1973 } 1974 } else if (ccl.isPrimitive()) { 1975 if (ccl == Integer.TYPE) { 1976 bin.readInts((int[]) array, 0, len); 1977 } else if (ccl == Byte.TYPE) { 1978 bin.readFully((byte[]) array, 0, len, true); 1979 } else if (ccl == Long.TYPE) { 1980 bin.readLongs((long[]) array, 0, len); 1981 } else if (ccl == Float.TYPE) { 1982 bin.readFloats((float[]) array, 0, len); 1983 } else if (ccl == Double.TYPE) { 1984 bin.readDoubles((double[]) array, 0, len); 1985 } else if (ccl == Short.TYPE) { 1986 bin.readShorts((short[]) array, 0, len); 1987 } else if (ccl == Character.TYPE) { 1988 bin.readChars((char[]) array, 0, len); 1989 } else if (ccl == Boolean.TYPE) { 1990 bin.readBooleans((boolean[]) array, 0, len); 1991 } else { 1992 throw new InternalError(); 1993 } 1994 } else { 1995 Object[] oa = (Object[]) array; 1996 for (int i = 0; i < len; i++) { 1997 oa[i] = readObject0(false); 1998 handles.markDependency(arrayHandle, passHandle); 1999 } 2000 } 2001 2002 handles.finish(arrayHandle); 2003 passHandle = arrayHandle; 2004 return array; 2005 } 2006 2007 /** 2008 * Reads in and returns enum constant, or null if enum type is 2009 * unresolvable. Sets passHandle to enum constant's assigned handle. 2010 */ 2011 private Enum<?> readEnum(boolean unshared) throws IOException { 2012 if (bin.readByte() != TC_ENUM) { 2013 throw new InternalError(); 2014 } 2015 2016 ObjectStreamClass desc = readClassDesc(false); 2017 if (!desc.isEnum()) { 2018 throw new InvalidClassException("non-enum class: " + desc); 2019 } 2020 2021 int enumHandle = handles.assign(unshared ? unsharedMarker : null); 2022 ClassNotFoundException resolveEx = desc.getResolveException(); 2023 if (resolveEx != null) { 2024 handles.markException(enumHandle, resolveEx); 2025 } 2026 2027 String name = readString(false); 2028 Enum<?> result = null; 2029 Class<?> cl = desc.forClass(); 2030 if (cl != null) { 2031 try { 2032 @SuppressWarnings("unchecked") 2033 Enum<?> en = Enum.valueOf((Class)cl, name); 2034 result = en; 2035 } catch (IllegalArgumentException ex) { 2036 throw (IOException) new InvalidObjectException( 2037 "enum constant " + name + " does not exist in " + 2038 cl).initCause(ex); 2039 } 2040 if (!unshared) { 2041 handles.setObject(enumHandle, result); 2042 } 2043 } 2044 2045 handles.finish(enumHandle); 2046 passHandle = enumHandle; 2047 return result; 2048 } 2049 2050 /** 2051 * Reads and returns "ordinary" (i.e., not a String, Class, 2052 * ObjectStreamClass, array, or enum constant) object, or null if object's 2053 * class is unresolvable (in which case a ClassNotFoundException will be 2054 * associated with object's handle). Sets passHandle to object's assigned 2055 * handle. 2056 */ 2057 private Object readOrdinaryObject(boolean unshared) 2058 throws IOException 2059 { 2060 if (bin.readByte() != TC_OBJECT) { 2061 throw new InternalError(); 2062 } 2063 2064 ObjectStreamClass desc = readClassDesc(false); 2065 desc.checkDeserialize(); 2066 2067 Class<?> cl = desc.forClass(); 2068 if (cl == String.class || cl == Class.class 2069 || cl == ObjectStreamClass.class) { 2070 throw new InvalidClassException("invalid class descriptor"); 2071 } 2072 2073 Object obj; 2074 try { 2075 obj = desc.isInstantiable() ? desc.newInstance() : null; 2076 } catch (Exception ex) { 2077 throw (IOException) new InvalidClassException( 2078 desc.forClass().getName(), 2079 "unable to create instance").initCause(ex); 2080 } 2081 2082 passHandle = handles.assign(unshared ? unsharedMarker : obj); 2083 ClassNotFoundException resolveEx = desc.getResolveException(); 2084 if (resolveEx != null) { 2085 handles.markException(passHandle, resolveEx); 2086 } 2087 2088 if (desc.isExternalizable()) { 2089 readExternalData((Externalizable) obj, desc); 2090 } else { 2091 readSerialData(obj, desc); 2092 } 2093 2094 handles.finish(passHandle); 2095 2096 if (obj != null && 2097 handles.lookupException(passHandle) == null && 2098 desc.hasReadResolveMethod()) 2099 { 2100 Object rep = desc.invokeReadResolve(obj); 2101 if (unshared && rep.getClass().isArray()) { 2102 rep = cloneArray(rep); 2103 } 2104 if (rep != obj) { 2105 // Filter the replacement object 2106 if (rep != null) { 2107 if (rep.getClass().isArray()) { 2108 filterCheck(rep.getClass(), Array.getLength(rep)); 2109 } else { 2110 filterCheck(rep.getClass(), -1); 2111 } 2112 } 2113 handles.setObject(passHandle, obj = rep); 2114 } 2115 } 2116 2117 return obj; 2118 } 2119 2120 /** 2121 * If obj is non-null, reads externalizable data by invoking readExternal() 2122 * method of obj; otherwise, attempts to skip over externalizable data. 2123 * Expects that passHandle is set to obj's handle before this method is 2124 * called. 2125 */ 2126 private void readExternalData(Externalizable obj, ObjectStreamClass desc) 2127 throws IOException 2128 { 2129 SerialCallbackContext oldContext = curContext; 2130 if (oldContext != null) 2131 oldContext.check(); 2132 curContext = null; 2133 try { 2134 boolean blocked = desc.hasBlockExternalData(); 2135 if (blocked) { 2136 bin.setBlockDataMode(true); 2137 } 2138 if (obj != null) { 2139 try { 2140 obj.readExternal(this); 2141 } catch (ClassNotFoundException ex) { 2142 /* 2143 * In most cases, the handle table has already propagated 2144 * a CNFException to passHandle at this point; this mark 2145 * call is included to address cases where the readExternal 2146 * method has cons'ed and thrown a new CNFException of its 2147 * own. 2148 */ 2149 handles.markException(passHandle, ex); 2150 } 2151 } 2152 if (blocked) { 2153 skipCustomData(); 2154 } 2155 } finally { 2156 if (oldContext != null) 2157 oldContext.check(); 2158 curContext = oldContext; 2159 } 2160 /* 2161 * At this point, if the externalizable data was not written in 2162 * block-data form and either the externalizable class doesn't exist 2163 * locally (i.e., obj == null) or readExternal() just threw a 2164 * CNFException, then the stream is probably in an inconsistent state, 2165 * since some (or all) of the externalizable data may not have been 2166 * consumed. Since there's no "correct" action to take in this case, 2167 * we mimic the behavior of past serialization implementations and 2168 * blindly hope that the stream is in sync; if it isn't and additional 2169 * externalizable data remains in the stream, a subsequent read will 2170 * most likely throw a StreamCorruptedException. 2171 */ 2172 } 2173 2174 /** 2175 * Reads (or attempts to skip, if obj is null or is tagged with a 2176 * ClassNotFoundException) instance data for each serializable class of 2177 * object in stream, from superclass to subclass. Expects that passHandle 2178 * is set to obj's handle before this method is called. 2179 */ 2180 private void readSerialData(Object obj, ObjectStreamClass desc) 2181 throws IOException 2182 { 2183 ObjectStreamClass.ClassDataSlot[] slots = desc.getClassDataLayout(); 2184 // Best effort Failure Atomicity; slotValues will be non-null if field 2185 // values can be set after reading all field data in the hierarchy. 2186 // Field values can only be set after reading all data if there are no 2187 // user observable methods in the hierarchy, readObject(NoData). The 2188 // top most Serializable class in the hierarchy can be skipped. 2189 FieldValues[] slotValues = null; 2190 2191 boolean hasSpecialReadMethod = false; 2192 for (int i = 1; i < slots.length; i++) { 2193 ObjectStreamClass slotDesc = slots[i].desc; 2194 if (slotDesc.hasReadObjectMethod() 2195 || slotDesc.hasReadObjectNoDataMethod()) { 2196 hasSpecialReadMethod = true; 2197 break; 2198 } 2199 } 2200 // No special read methods, can store values and defer setting. 2201 if (!hasSpecialReadMethod) 2202 slotValues = new FieldValues[slots.length]; 2203 2204 for (int i = 0; i < slots.length; i++) { 2205 ObjectStreamClass slotDesc = slots[i].desc; 2206 2207 if (slots[i].hasData) { 2208 if (obj == null || handles.lookupException(passHandle) != null) { 2209 defaultReadFields(null, slotDesc); // skip field values 2210 } else if (slotDesc.hasReadObjectMethod()) { 2211 ThreadDeath t = null; 2212 boolean reset = false; 2213 SerialCallbackContext oldContext = curContext; 2214 if (oldContext != null) 2215 oldContext.check(); 2216 try { 2217 curContext = new SerialCallbackContext(obj, slotDesc); 2218 2219 bin.setBlockDataMode(true); 2220 slotDesc.invokeReadObject(obj, this); 2221 } catch (ClassNotFoundException ex) { 2222 /* 2223 * In most cases, the handle table has already 2224 * propagated a CNFException to passHandle at this 2225 * point; this mark call is included to address cases 2226 * where the custom readObject method has cons'ed and 2227 * thrown a new CNFException of its own. 2228 */ 2229 handles.markException(passHandle, ex); 2230 } finally { 2231 do { 2232 try { 2233 curContext.setUsed(); 2234 if (oldContext!= null) 2235 oldContext.check(); 2236 curContext = oldContext; 2237 reset = true; 2238 } catch (ThreadDeath x) { 2239 t = x; // defer until reset is true 2240 } 2241 } while (!reset); 2242 if (t != null) 2243 throw t; 2244 } 2245 2246 /* 2247 * defaultDataEnd may have been set indirectly by custom 2248 * readObject() method when calling defaultReadObject() or 2249 * readFields(); clear it to restore normal read behavior. 2250 */ 2251 defaultDataEnd = false; 2252 } else { 2253 FieldValues vals = defaultReadFields(obj, slotDesc); 2254 if (slotValues != null) { 2255 slotValues[i] = vals; 2256 } else if (obj != null) { 2257 defaultCheckFieldValues(obj, slotDesc, vals); 2258 defaultSetFieldValues(obj, slotDesc, vals); 2259 } 2260 } 2261 2262 if (slotDesc.hasWriteObjectData()) { 2263 skipCustomData(); 2264 } else { 2265 bin.setBlockDataMode(false); 2266 } 2267 } else { 2268 if (obj != null && 2269 slotDesc.hasReadObjectNoDataMethod() && 2270 handles.lookupException(passHandle) == null) 2271 { 2272 slotDesc.invokeReadObjectNoData(obj); 2273 } 2274 } 2275 } 2276 2277 if (obj != null && slotValues != null) { 2278 // Check that the non-primitive types are assignable for all slots 2279 // before assigning. 2280 for (int i = 0; i < slots.length; i++) { 2281 if (slotValues[i] != null) 2282 defaultCheckFieldValues(obj, slots[i].desc, slotValues[i]); 2283 } 2284 for (int i = 0; i < slots.length; i++) { 2285 if (slotValues[i] != null) 2286 defaultSetFieldValues(obj, slots[i].desc, slotValues[i]); 2287 } 2288 } 2289 } 2290 2291 /** 2292 * Skips over all block data and objects until TC_ENDBLOCKDATA is 2293 * encountered. 2294 */ 2295 private void skipCustomData() throws IOException { 2296 int oldHandle = passHandle; 2297 for (;;) { 2298 if (bin.getBlockDataMode()) { 2299 bin.skipBlockData(); 2300 bin.setBlockDataMode(false); 2301 } 2302 switch (bin.peekByte()) { 2303 case TC_BLOCKDATA: 2304 case TC_BLOCKDATALONG: 2305 bin.setBlockDataMode(true); 2306 break; 2307 2308 case TC_ENDBLOCKDATA: 2309 bin.readByte(); 2310 passHandle = oldHandle; 2311 return; 2312 2313 default: 2314 readObject0(false); 2315 break; 2316 } 2317 } 2318 } 2319 2320 private class FieldValues { 2321 final byte[] primValues; 2322 final Object[] objValues; 2323 2324 FieldValues(byte[] primValues, Object[] objValues) { 2325 this.primValues = primValues; 2326 this.objValues = objValues; 2327 } 2328 } 2329 2330 /** 2331 * Reads in values of serializable fields declared by given class 2332 * descriptor. Expects that passHandle is set to obj's handle before this 2333 * method is called. 2334 */ 2335 private FieldValues defaultReadFields(Object obj, ObjectStreamClass desc) 2336 throws IOException 2337 { 2338 Class<?> cl = desc.forClass(); 2339 if (cl != null && obj != null && !cl.isInstance(obj)) { 2340 throw new ClassCastException(); 2341 } 2342 2343 byte[] primVals = null; 2344 int primDataSize = desc.getPrimDataSize(); 2345 if (primDataSize > 0) { 2346 primVals = new byte[primDataSize]; 2347 bin.readFully(primVals, 0, primDataSize, false); 2348 } 2349 2350 Object[] objVals = null; 2351 int numObjFields = desc.getNumObjFields(); 2352 if (numObjFields > 0) { 2353 int objHandle = passHandle; 2354 ObjectStreamField[] fields = desc.getFields(false); 2355 objVals = new Object[numObjFields]; 2356 int numPrimFields = fields.length - objVals.length; 2357 for (int i = 0; i < objVals.length; i++) { 2358 ObjectStreamField f = fields[numPrimFields + i]; 2359 objVals[i] = readObject0(f.isUnshared()); 2360 if (f.getField() != null) { 2361 handles.markDependency(objHandle, passHandle); 2362 } 2363 } 2364 passHandle = objHandle; 2365 } 2366 2367 return new FieldValues(primVals, objVals); 2368 } 2369 2370 /** Throws ClassCastException if any value is not assignable. */ 2371 private void defaultCheckFieldValues(Object obj, ObjectStreamClass desc, 2372 FieldValues values) { 2373 Object[] objectValues = values.objValues; 2374 if (objectValues != null) 2375 desc.checkObjFieldValueTypes(obj, objectValues); 2376 } 2377 2378 /** Sets field values in obj. */ 2379 private void defaultSetFieldValues(Object obj, ObjectStreamClass desc, 2380 FieldValues values) { 2381 byte[] primValues = values.primValues; 2382 Object[] objectValues = values.objValues; 2383 2384 if (primValues != null) 2385 desc.setPrimFieldValues(obj, primValues); 2386 if (objectValues != null) 2387 desc.setObjFieldValues(obj, objectValues); 2388 } 2389 2390 /** 2391 * Reads in and returns IOException that caused serialization to abort. 2392 * All stream state is discarded prior to reading in fatal exception. Sets 2393 * passHandle to fatal exception's handle. 2394 */ 2395 private IOException readFatalException() throws IOException { 2396 if (bin.readByte() != TC_EXCEPTION) { 2397 throw new InternalError(); 2398 } 2399 clear(); 2400 return (IOException) readObject0(false); 2401 } 2402 2403 /** 2404 * If recursion depth is 0, clears internal data structures; otherwise, 2405 * throws a StreamCorruptedException. This method is called when a 2406 * TC_RESET typecode is encountered. 2407 */ 2408 private void handleReset() throws StreamCorruptedException { 2409 if (depth > 0) { 2410 throw new StreamCorruptedException( 2411 "unexpected reset; recursion depth: " + depth); 2412 } 2413 clear(); 2414 } 2415 2416 /** 2417 * Converts specified span of bytes into float values. 2418 */ 2419 // REMIND: remove once hotspot inlines Float.intBitsToFloat 2420 private static native void bytesToFloats(byte[] src, int srcpos, 2421 float[] dst, int dstpos, 2422 int nfloats); 2423 2424 /** 2425 * Converts specified span of bytes into double values. 2426 */ 2427 // REMIND: remove once hotspot inlines Double.longBitsToDouble 2428 private static native void bytesToDoubles(byte[] src, int srcpos, 2429 double[] dst, int dstpos, 2430 int ndoubles); 2431 2432 /** 2433 * Returns the first non-null and non-platform class loader (not counting 2434 * class loaders of generated reflection implementation classes) up the 2435 * execution stack, or the platform class loader if only code from the 2436 * bootstrap and platform class loader is on the stack. 2437 */ 2438 private static ClassLoader latestUserDefinedLoader() { 2439 return jdk.internal.misc.VM.latestUserDefinedLoader(); 2440 } 2441 2442 /** 2443 * Default GetField implementation. 2444 */ 2445 private class GetFieldImpl extends GetField { 2446 2447 /** class descriptor describing serializable fields */ 2448 private final ObjectStreamClass desc; 2449 /** primitive field values */ 2450 private final byte[] primVals; 2451 /** object field values */ 2452 private final Object[] objVals; 2453 /** object field value handles */ 2454 private final int[] objHandles; 2455 2456 /** 2457 * Creates GetFieldImpl object for reading fields defined in given 2458 * class descriptor. 2459 */ 2460 GetFieldImpl(ObjectStreamClass desc) { 2461 this.desc = desc; 2462 primVals = new byte[desc.getPrimDataSize()]; 2463 objVals = new Object[desc.getNumObjFields()]; 2464 objHandles = new int[objVals.length]; 2465 } 2466 2467 public ObjectStreamClass getObjectStreamClass() { 2468 return desc; 2469 } 2470 2471 public boolean defaulted(String name) throws IOException { 2472 return (getFieldOffset(name, null) < 0); 2473 } 2474 2475 public boolean get(String name, boolean val) throws IOException { 2476 int off = getFieldOffset(name, Boolean.TYPE); 2477 return (off >= 0) ? Bits.getBoolean(primVals, off) : val; 2478 } 2479 2480 public byte get(String name, byte val) throws IOException { 2481 int off = getFieldOffset(name, Byte.TYPE); 2482 return (off >= 0) ? primVals[off] : val; 2483 } 2484 2485 public char get(String name, char val) throws IOException { 2486 int off = getFieldOffset(name, Character.TYPE); 2487 return (off >= 0) ? Bits.getChar(primVals, off) : val; 2488 } 2489 2490 public short get(String name, short val) throws IOException { 2491 int off = getFieldOffset(name, Short.TYPE); 2492 return (off >= 0) ? Bits.getShort(primVals, off) : val; 2493 } 2494 2495 public int get(String name, int val) throws IOException { 2496 int off = getFieldOffset(name, Integer.TYPE); 2497 return (off >= 0) ? Bits.getInt(primVals, off) : val; 2498 } 2499 2500 public float get(String name, float val) throws IOException { 2501 int off = getFieldOffset(name, Float.TYPE); 2502 return (off >= 0) ? Bits.getFloat(primVals, off) : val; 2503 } 2504 2505 public long get(String name, long val) throws IOException { 2506 int off = getFieldOffset(name, Long.TYPE); 2507 return (off >= 0) ? Bits.getLong(primVals, off) : val; 2508 } 2509 2510 public double get(String name, double val) throws IOException { 2511 int off = getFieldOffset(name, Double.TYPE); 2512 return (off >= 0) ? Bits.getDouble(primVals, off) : val; 2513 } 2514 2515 public Object get(String name, Object val) throws IOException { 2516 int off = getFieldOffset(name, Object.class); 2517 if (off >= 0) { 2518 int objHandle = objHandles[off]; 2519 handles.markDependency(passHandle, objHandle); 2520 return (handles.lookupException(objHandle) == null) ? 2521 objVals[off] : null; 2522 } else { 2523 return val; 2524 } 2525 } 2526 2527 /** 2528 * Reads primitive and object field values from stream. 2529 */ 2530 void readFields() throws IOException { 2531 bin.readFully(primVals, 0, primVals.length, false); 2532 2533 int oldHandle = passHandle; 2534 ObjectStreamField[] fields = desc.getFields(false); 2535 int numPrimFields = fields.length - objVals.length; 2536 for (int i = 0; i < objVals.length; i++) { 2537 objVals[i] = 2538 readObject0(fields[numPrimFields + i].isUnshared()); 2539 objHandles[i] = passHandle; 2540 } 2541 passHandle = oldHandle; 2542 } 2543 2544 /** 2545 * Returns offset of field with given name and type. A specified type 2546 * of null matches all types, Object.class matches all non-primitive 2547 * types, and any other non-null type matches assignable types only. 2548 * If no matching field is found in the (incoming) class 2549 * descriptor but a matching field is present in the associated local 2550 * class descriptor, returns -1. Throws IllegalArgumentException if 2551 * neither incoming nor local class descriptor contains a match. 2552 */ 2553 private int getFieldOffset(String name, Class<?> type) { 2554 ObjectStreamField field = desc.getField(name, type); 2555 if (field != null) { 2556 return field.getOffset(); 2557 } else if (desc.getLocalDesc().getField(name, type) != null) { 2558 return -1; 2559 } else { 2560 throw new IllegalArgumentException("no such field " + name + 2561 " with type " + type); 2562 } 2563 } 2564 } 2565 2566 /** 2567 * Prioritized list of callbacks to be performed once object graph has been 2568 * completely deserialized. 2569 */ 2570 private static class ValidationList { 2571 2572 private static class Callback { 2573 final ObjectInputValidation obj; 2574 final int priority; 2575 Callback next; 2576 final AccessControlContext acc; 2577 2578 Callback(ObjectInputValidation obj, int priority, Callback next, 2579 AccessControlContext acc) 2580 { 2581 this.obj = obj; 2582 this.priority = priority; 2583 this.next = next; 2584 this.acc = acc; 2585 } 2586 } 2587 2588 /** linked list of callbacks */ 2589 private Callback list; 2590 2591 /** 2592 * Creates new (empty) ValidationList. 2593 */ 2594 ValidationList() { 2595 } 2596 2597 /** 2598 * Registers callback. Throws InvalidObjectException if callback 2599 * object is null. 2600 */ 2601 void register(ObjectInputValidation obj, int priority) 2602 throws InvalidObjectException 2603 { 2604 if (obj == null) { 2605 throw new InvalidObjectException("null callback"); 2606 } 2607 2608 Callback prev = null, cur = list; 2609 while (cur != null && priority < cur.priority) { 2610 prev = cur; 2611 cur = cur.next; 2612 } 2613 AccessControlContext acc = AccessController.getContext(); 2614 if (prev != null) { 2615 prev.next = new Callback(obj, priority, cur, acc); 2616 } else { 2617 list = new Callback(obj, priority, list, acc); 2618 } 2619 } 2620 2621 /** 2622 * Invokes all registered callbacks and clears the callback list. 2623 * Callbacks with higher priorities are called first; those with equal 2624 * priorities may be called in any order. If any of the callbacks 2625 * throws an InvalidObjectException, the callback process is terminated 2626 * and the exception propagated upwards. 2627 */ 2628 void doCallbacks() throws InvalidObjectException { 2629 try { 2630 while (list != null) { 2631 AccessController.doPrivileged( 2632 new PrivilegedExceptionAction<Void>() 2633 { 2634 public Void run() throws InvalidObjectException { 2635 list.obj.validateObject(); 2636 return null; 2637 } 2638 }, list.acc); 2639 list = list.next; 2640 } 2641 } catch (PrivilegedActionException ex) { 2642 list = null; 2643 throw (InvalidObjectException) ex.getException(); 2644 } 2645 } 2646 2647 /** 2648 * Resets the callback list to its initial (empty) state. 2649 */ 2650 public void clear() { 2651 list = null; 2652 } 2653 } 2654 2655 /** 2656 * Hold a snapshot of values to be passed to an ObjectInputFilter. 2657 */ 2658 static class FilterValues implements ObjectInputFilter.FilterInfo { 2659 final Class<?> clazz; 2660 final long arrayLength; 2661 final long totalObjectRefs; 2662 final long depth; 2663 final long streamBytes; 2664 2665 public FilterValues(Class<?> clazz, long arrayLength, long totalObjectRefs, 2666 long depth, long streamBytes) { 2667 this.clazz = clazz; 2668 this.arrayLength = arrayLength; 2669 this.totalObjectRefs = totalObjectRefs; 2670 this.depth = depth; 2671 this.streamBytes = streamBytes; 2672 } 2673 2674 @Override 2675 public Class<?> serialClass() { 2676 return clazz; 2677 } 2678 2679 @Override 2680 public long arrayLength() { 2681 return arrayLength; 2682 } 2683 2684 @Override 2685 public long references() { 2686 return totalObjectRefs; 2687 } 2688 2689 @Override 2690 public long depth() { 2691 return depth; 2692 } 2693 2694 @Override 2695 public long streamBytes() { 2696 return streamBytes; 2697 } 2698 } 2699 2700 /** 2701 * Input stream supporting single-byte peek operations. 2702 */ 2703 private static class PeekInputStream extends InputStream { 2704 2705 /** underlying stream */ 2706 private final InputStream in; 2707 /** peeked byte */ 2708 private int peekb = -1; 2709 /** total bytes read from the stream */ 2710 private long totalBytesRead = 0; 2711 2712 /** 2713 * Creates new PeekInputStream on top of given underlying stream. 2714 */ 2715 PeekInputStream(InputStream in) { 2716 this.in = in; 2717 } 2718 2719 /** 2720 * Peeks at next byte value in stream. Similar to read(), except 2721 * that it does not consume the read value. 2722 */ 2723 int peek() throws IOException { 2724 if (peekb >= 0) { 2725 return peekb; 2726 } 2727 peekb = in.read(); 2728 totalBytesRead += peekb >= 0 ? 1 : 0; 2729 return peekb; 2730 } 2731 2732 public int read() throws IOException { 2733 if (peekb >= 0) { 2734 int v = peekb; 2735 peekb = -1; 2736 return v; 2737 } else { 2738 int nbytes = in.read(); 2739 totalBytesRead += nbytes >= 0 ? 1 : 0; 2740 return nbytes; 2741 } 2742 } 2743 2744 public int read(byte[] b, int off, int len) throws IOException { 2745 int nbytes; 2746 if (len == 0) { 2747 return 0; 2748 } else if (peekb < 0) { 2749 nbytes = in.read(b, off, len); 2750 totalBytesRead += nbytes >= 0 ? nbytes : 0; 2751 return nbytes; 2752 } else { 2753 b[off++] = (byte) peekb; 2754 len--; 2755 peekb = -1; 2756 nbytes = in.read(b, off, len); 2757 totalBytesRead += nbytes >= 0 ? nbytes : 0; 2758 return (nbytes >= 0) ? (nbytes + 1) : 1; 2759 } 2760 } 2761 2762 void readFully(byte[] b, int off, int len) throws IOException { 2763 int n = 0; 2764 while (n < len) { 2765 int count = read(b, off + n, len - n); 2766 if (count < 0) { 2767 throw new EOFException(); 2768 } 2769 n += count; 2770 } 2771 } 2772 2773 public long skip(long n) throws IOException { 2774 if (n <= 0) { 2775 return 0; 2776 } 2777 int skipped = 0; 2778 if (peekb >= 0) { 2779 peekb = -1; 2780 skipped++; 2781 n--; 2782 } 2783 n = skipped + in.skip(n); 2784 totalBytesRead += n; 2785 return n; 2786 } 2787 2788 public int available() throws IOException { 2789 return in.available() + ((peekb >= 0) ? 1 : 0); 2790 } 2791 2792 public void close() throws IOException { 2793 in.close(); 2794 } 2795 2796 public long getBytesRead() { 2797 return totalBytesRead; 2798 } 2799 } 2800 2801 private static final Unsafe UNSAFE = Unsafe.getUnsafe(); 2802 2803 /** 2804 * Performs a "freeze" action, required to adhere to final field semantics. 2805 * 2806 * <p> This method can be called unconditionally before returning the graph, 2807 * from the topmost readObject call, since it is expected that the 2808 * additional cost of the freeze action is negligible compared to 2809 * reconstituting even the most simple graph. 2810 * 2811 * <p> Nested calls to readObject do not issue freeze actions because the 2812 * sub-graph returned from a nested call is not guaranteed to be fully 2813 * initialized yet (possible cycles). 2814 */ 2815 private void freeze() { 2816 // Issue a StoreStore|StoreLoad fence, which is at least sufficient 2817 // to provide final-freeze semantics. 2818 UNSAFE.storeFence(); 2819 } 2820 2821 /** 2822 * Input stream with two modes: in default mode, inputs data written in the 2823 * same format as DataOutputStream; in "block data" mode, inputs data 2824 * bracketed by block data markers (see object serialization specification 2825 * for details). Buffering depends on block data mode: when in default 2826 * mode, no data is buffered in advance; when in block data mode, all data 2827 * for the current data block is read in at once (and buffered). 2828 */ 2829 private class BlockDataInputStream 2830 extends InputStream implements DataInput 2831 { 2832 /** maximum data block length */ 2833 private static final int MAX_BLOCK_SIZE = 1024; 2834 /** maximum data block header length */ 2835 private static final int MAX_HEADER_SIZE = 5; 2836 /** (tunable) length of char buffer (for reading strings) */ 2837 private static final int CHAR_BUF_SIZE = 256; 2838 /** readBlockHeader() return value indicating header read may block */ 2839 private static final int HEADER_BLOCKED = -2; 2840 2841 /** buffer for reading general/block data */ 2842 private final byte[] buf = new byte[MAX_BLOCK_SIZE]; 2843 /** buffer for reading block data headers */ 2844 private final byte[] hbuf = new byte[MAX_HEADER_SIZE]; 2845 /** char buffer for fast string reads */ 2846 private final char[] cbuf = new char[CHAR_BUF_SIZE]; 2847 2848 /** block data mode */ 2849 private boolean blkmode = false; 2850 2851 // block data state fields; values meaningful only when blkmode true 2852 /** current offset into buf */ 2853 private int pos = 0; 2854 /** end offset of valid data in buf, or -1 if no more block data */ 2855 private int end = -1; 2856 /** number of bytes in current block yet to be read from stream */ 2857 private int unread = 0; 2858 2859 /** underlying stream (wrapped in peekable filter stream) */ 2860 private final PeekInputStream in; 2861 /** loopback stream (for data reads that span data blocks) */ 2862 private final DataInputStream din; 2863 2864 /** 2865 * Creates new BlockDataInputStream on top of given underlying stream. 2866 * Block data mode is turned off by default. 2867 */ 2868 BlockDataInputStream(InputStream in) { 2869 this.in = new PeekInputStream(in); 2870 din = new DataInputStream(this); 2871 } 2872 2873 /** 2874 * Sets block data mode to the given mode (true == on, false == off) 2875 * and returns the previous mode value. If the new mode is the same as 2876 * the old mode, no action is taken. Throws IllegalStateException if 2877 * block data mode is being switched from on to off while unconsumed 2878 * block data is still present in the stream. 2879 */ 2880 boolean setBlockDataMode(boolean newmode) throws IOException { 2881 if (blkmode == newmode) { 2882 return blkmode; 2883 } 2884 if (newmode) { 2885 pos = 0; 2886 end = 0; 2887 unread = 0; 2888 } else if (pos < end) { 2889 throw new IllegalStateException("unread block data"); 2890 } 2891 blkmode = newmode; 2892 return !blkmode; 2893 } 2894 2895 /** 2896 * Returns true if the stream is currently in block data mode, false 2897 * otherwise. 2898 */ 2899 boolean getBlockDataMode() { 2900 return blkmode; 2901 } 2902 2903 /** 2904 * If in block data mode, skips to the end of the current group of data 2905 * blocks (but does not unset block data mode). If not in block data 2906 * mode, throws an IllegalStateException. 2907 */ 2908 void skipBlockData() throws IOException { 2909 if (!blkmode) { 2910 throw new IllegalStateException("not in block data mode"); 2911 } 2912 while (end >= 0) { 2913 refill(); 2914 } 2915 } 2916 2917 /** 2918 * Attempts to read in the next block data header (if any). If 2919 * canBlock is false and a full header cannot be read without possibly 2920 * blocking, returns HEADER_BLOCKED, else if the next element in the 2921 * stream is a block data header, returns the block data length 2922 * specified by the header, else returns -1. 2923 */ 2924 private int readBlockHeader(boolean canBlock) throws IOException { 2925 if (defaultDataEnd) { 2926 /* 2927 * Fix for 4360508: stream is currently at the end of a field 2928 * value block written via default serialization; since there 2929 * is no terminating TC_ENDBLOCKDATA tag, simulate 2930 * end-of-custom-data behavior explicitly. 2931 */ 2932 return -1; 2933 } 2934 try { 2935 for (;;) { 2936 int avail = canBlock ? Integer.MAX_VALUE : in.available(); 2937 if (avail == 0) { 2938 return HEADER_BLOCKED; 2939 } 2940 2941 int tc = in.peek(); 2942 switch (tc) { 2943 case TC_BLOCKDATA: 2944 if (avail < 2) { 2945 return HEADER_BLOCKED; 2946 } 2947 in.readFully(hbuf, 0, 2); 2948 return hbuf[1] & 0xFF; 2949 2950 case TC_BLOCKDATALONG: 2951 if (avail < 5) { 2952 return HEADER_BLOCKED; 2953 } 2954 in.readFully(hbuf, 0, 5); 2955 int len = Bits.getInt(hbuf, 1); 2956 if (len < 0) { 2957 throw new StreamCorruptedException( 2958 "illegal block data header length: " + 2959 len); 2960 } 2961 return len; 2962 2963 /* 2964 * TC_RESETs may occur in between data blocks. 2965 * Unfortunately, this case must be parsed at a lower 2966 * level than other typecodes, since primitive data 2967 * reads may span data blocks separated by a TC_RESET. 2968 */ 2969 case TC_RESET: 2970 in.read(); 2971 handleReset(); 2972 break; 2973 2974 default: 2975 if (tc >= 0 && (tc < TC_BASE || tc > TC_MAX)) { 2976 throw new StreamCorruptedException( 2977 String.format("invalid type code: %02X", 2978 tc)); 2979 } 2980 return -1; 2981 } 2982 } 2983 } catch (EOFException ex) { 2984 throw new StreamCorruptedException( 2985 "unexpected EOF while reading block data header"); 2986 } 2987 } 2988 2989 /** 2990 * Refills internal buffer buf with block data. Any data in buf at the 2991 * time of the call is considered consumed. Sets the pos, end, and 2992 * unread fields to reflect the new amount of available block data; if 2993 * the next element in the stream is not a data block, sets pos and 2994 * unread to 0 and end to -1. 2995 */ 2996 private void refill() throws IOException { 2997 try { 2998 do { 2999 pos = 0; 3000 if (unread > 0) { 3001 int n = 3002 in.read(buf, 0, Math.min(unread, MAX_BLOCK_SIZE)); 3003 if (n >= 0) { 3004 end = n; 3005 unread -= n; 3006 } else { 3007 throw new StreamCorruptedException( 3008 "unexpected EOF in middle of data block"); 3009 } 3010 } else { 3011 int n = readBlockHeader(true); 3012 if (n >= 0) { 3013 end = 0; 3014 unread = n; 3015 } else { 3016 end = -1; 3017 unread = 0; 3018 } 3019 } 3020 } while (pos == end); 3021 } catch (IOException ex) { 3022 pos = 0; 3023 end = -1; 3024 unread = 0; 3025 throw ex; 3026 } 3027 } 3028 3029 /** 3030 * If in block data mode, returns the number of unconsumed bytes 3031 * remaining in the current data block. If not in block data mode, 3032 * throws an IllegalStateException. 3033 */ 3034 int currentBlockRemaining() { 3035 if (blkmode) { 3036 return (end >= 0) ? (end - pos) + unread : 0; 3037 } else { 3038 throw new IllegalStateException(); 3039 } 3040 } 3041 3042 /** 3043 * Peeks at (but does not consume) and returns the next byte value in 3044 * the stream, or -1 if the end of the stream/block data (if in block 3045 * data mode) has been reached. 3046 */ 3047 int peek() throws IOException { 3048 if (blkmode) { 3049 if (pos == end) { 3050 refill(); 3051 } 3052 return (end >= 0) ? (buf[pos] & 0xFF) : -1; 3053 } else { 3054 return in.peek(); 3055 } 3056 } 3057 3058 /** 3059 * Peeks at (but does not consume) and returns the next byte value in 3060 * the stream, or throws EOFException if end of stream/block data has 3061 * been reached. 3062 */ 3063 byte peekByte() throws IOException { 3064 int val = peek(); 3065 if (val < 0) { 3066 throw new EOFException(); 3067 } 3068 return (byte) val; 3069 } 3070 3071 3072 /* ----------------- generic input stream methods ------------------ */ 3073 /* 3074 * The following methods are equivalent to their counterparts in 3075 * InputStream, except that they interpret data block boundaries and 3076 * read the requested data from within data blocks when in block data 3077 * mode. 3078 */ 3079 3080 public int read() throws IOException { 3081 if (blkmode) { 3082 if (pos == end) { 3083 refill(); 3084 } 3085 return (end >= 0) ? (buf[pos++] & 0xFF) : -1; 3086 } else { 3087 return in.read(); 3088 } 3089 } 3090 3091 public int read(byte[] b, int off, int len) throws IOException { 3092 return read(b, off, len, false); 3093 } 3094 3095 public long skip(long len) throws IOException { 3096 long remain = len; 3097 while (remain > 0) { 3098 if (blkmode) { 3099 if (pos == end) { 3100 refill(); 3101 } 3102 if (end < 0) { 3103 break; 3104 } 3105 int nread = (int) Math.min(remain, end - pos); 3106 remain -= nread; 3107 pos += nread; 3108 } else { 3109 int nread = (int) Math.min(remain, MAX_BLOCK_SIZE); 3110 if ((nread = in.read(buf, 0, nread)) < 0) { 3111 break; 3112 } 3113 remain -= nread; 3114 } 3115 } 3116 return len - remain; 3117 } 3118 3119 public int available() throws IOException { 3120 if (blkmode) { 3121 if ((pos == end) && (unread == 0)) { 3122 int n; 3123 while ((n = readBlockHeader(false)) == 0) ; 3124 switch (n) { 3125 case HEADER_BLOCKED: 3126 break; 3127 3128 case -1: 3129 pos = 0; 3130 end = -1; 3131 break; 3132 3133 default: 3134 pos = 0; 3135 end = 0; 3136 unread = n; 3137 break; 3138 } 3139 } 3140 // avoid unnecessary call to in.available() if possible 3141 int unreadAvail = (unread > 0) ? 3142 Math.min(in.available(), unread) : 0; 3143 return (end >= 0) ? (end - pos) + unreadAvail : 0; 3144 } else { 3145 return in.available(); 3146 } 3147 } 3148 3149 public void close() throws IOException { 3150 if (blkmode) { 3151 pos = 0; 3152 end = -1; 3153 unread = 0; 3154 } 3155 in.close(); 3156 } 3157 3158 /** 3159 * Attempts to read len bytes into byte array b at offset off. Returns 3160 * the number of bytes read, or -1 if the end of stream/block data has 3161 * been reached. If copy is true, reads values into an intermediate 3162 * buffer before copying them to b (to avoid exposing a reference to 3163 * b). 3164 */ 3165 int read(byte[] b, int off, int len, boolean copy) throws IOException { 3166 if (len == 0) { 3167 return 0; 3168 } else if (blkmode) { 3169 if (pos == end) { 3170 refill(); 3171 } 3172 if (end < 0) { 3173 return -1; 3174 } 3175 int nread = Math.min(len, end - pos); 3176 System.arraycopy(buf, pos, b, off, nread); 3177 pos += nread; 3178 return nread; 3179 } else if (copy) { 3180 int nread = in.read(buf, 0, Math.min(len, MAX_BLOCK_SIZE)); 3181 if (nread > 0) { 3182 System.arraycopy(buf, 0, b, off, nread); 3183 } 3184 return nread; 3185 } else { 3186 return in.read(b, off, len); 3187 } 3188 } 3189 3190 /* ----------------- primitive data input methods ------------------ */ 3191 /* 3192 * The following methods are equivalent to their counterparts in 3193 * DataInputStream, except that they interpret data block boundaries 3194 * and read the requested data from within data blocks when in block 3195 * data mode. 3196 */ 3197 3198 public void readFully(byte[] b) throws IOException { 3199 readFully(b, 0, b.length, false); 3200 } 3201 3202 public void readFully(byte[] b, int off, int len) throws IOException { 3203 readFully(b, off, len, false); 3204 } 3205 3206 public void readFully(byte[] b, int off, int len, boolean copy) 3207 throws IOException 3208 { 3209 while (len > 0) { 3210 int n = read(b, off, len, copy); 3211 if (n < 0) { 3212 throw new EOFException(); 3213 } 3214 off += n; 3215 len -= n; 3216 } 3217 } 3218 3219 public int skipBytes(int n) throws IOException { 3220 return din.skipBytes(n); 3221 } 3222 3223 public boolean readBoolean() throws IOException { 3224 int v = read(); 3225 if (v < 0) { 3226 throw new EOFException(); 3227 } 3228 return (v != 0); 3229 } 3230 3231 public byte readByte() throws IOException { 3232 int v = read(); 3233 if (v < 0) { 3234 throw new EOFException(); 3235 } 3236 return (byte) v; 3237 } 3238 3239 public int readUnsignedByte() throws IOException { 3240 int v = read(); 3241 if (v < 0) { 3242 throw new EOFException(); 3243 } 3244 return v; 3245 } 3246 3247 public char readChar() throws IOException { 3248 if (!blkmode) { 3249 pos = 0; 3250 in.readFully(buf, 0, 2); 3251 } else if (end - pos < 2) { 3252 return din.readChar(); 3253 } 3254 char v = Bits.getChar(buf, pos); 3255 pos += 2; 3256 return v; 3257 } 3258 3259 public short readShort() throws IOException { 3260 if (!blkmode) { 3261 pos = 0; 3262 in.readFully(buf, 0, 2); 3263 } else if (end - pos < 2) { 3264 return din.readShort(); 3265 } 3266 short v = Bits.getShort(buf, pos); 3267 pos += 2; 3268 return v; 3269 } 3270 3271 public int readUnsignedShort() throws IOException { 3272 if (!blkmode) { 3273 pos = 0; 3274 in.readFully(buf, 0, 2); 3275 } else if (end - pos < 2) { 3276 return din.readUnsignedShort(); 3277 } 3278 int v = Bits.getShort(buf, pos) & 0xFFFF; 3279 pos += 2; 3280 return v; 3281 } 3282 3283 public int readInt() throws IOException { 3284 if (!blkmode) { 3285 pos = 0; 3286 in.readFully(buf, 0, 4); 3287 } else if (end - pos < 4) { 3288 return din.readInt(); 3289 } 3290 int v = Bits.getInt(buf, pos); 3291 pos += 4; 3292 return v; 3293 } 3294 3295 public float readFloat() throws IOException { 3296 if (!blkmode) { 3297 pos = 0; 3298 in.readFully(buf, 0, 4); 3299 } else if (end - pos < 4) { 3300 return din.readFloat(); 3301 } 3302 float v = Bits.getFloat(buf, pos); 3303 pos += 4; 3304 return v; 3305 } 3306 3307 public long readLong() throws IOException { 3308 if (!blkmode) { 3309 pos = 0; 3310 in.readFully(buf, 0, 8); 3311 } else if (end - pos < 8) { 3312 return din.readLong(); 3313 } 3314 long v = Bits.getLong(buf, pos); 3315 pos += 8; 3316 return v; 3317 } 3318 3319 public double readDouble() throws IOException { 3320 if (!blkmode) { 3321 pos = 0; 3322 in.readFully(buf, 0, 8); 3323 } else if (end - pos < 8) { 3324 return din.readDouble(); 3325 } 3326 double v = Bits.getDouble(buf, pos); 3327 pos += 8; 3328 return v; 3329 } 3330 3331 public String readUTF() throws IOException { 3332 return readUTFBody(readUnsignedShort()); 3333 } 3334 3335 @SuppressWarnings("deprecation") 3336 public String readLine() throws IOException { 3337 return din.readLine(); // deprecated, not worth optimizing 3338 } 3339 3340 /* -------------- primitive data array input methods --------------- */ 3341 /* 3342 * The following methods read in spans of primitive data values. 3343 * Though equivalent to calling the corresponding primitive read 3344 * methods repeatedly, these methods are optimized for reading groups 3345 * of primitive data values more efficiently. 3346 */ 3347 3348 void readBooleans(boolean[] v, int off, int len) throws IOException { 3349 int stop, endoff = off + len; 3350 while (off < endoff) { 3351 if (!blkmode) { 3352 int span = Math.min(endoff - off, MAX_BLOCK_SIZE); 3353 in.readFully(buf, 0, span); 3354 stop = off + span; 3355 pos = 0; 3356 } else if (end - pos < 1) { 3357 v[off++] = din.readBoolean(); 3358 continue; 3359 } else { 3360 stop = Math.min(endoff, off + end - pos); 3361 } 3362 3363 while (off < stop) { 3364 v[off++] = Bits.getBoolean(buf, pos++); 3365 } 3366 } 3367 } 3368 3369 void readChars(char[] v, int off, int len) throws IOException { 3370 int stop, endoff = off + len; 3371 while (off < endoff) { 3372 if (!blkmode) { 3373 int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 1); 3374 in.readFully(buf, 0, span << 1); 3375 stop = off + span; 3376 pos = 0; 3377 } else if (end - pos < 2) { 3378 v[off++] = din.readChar(); 3379 continue; 3380 } else { 3381 stop = Math.min(endoff, off + ((end - pos) >> 1)); 3382 } 3383 3384 while (off < stop) { 3385 v[off++] = Bits.getChar(buf, pos); 3386 pos += 2; 3387 } 3388 } 3389 } 3390 3391 void readShorts(short[] v, int off, int len) throws IOException { 3392 int stop, endoff = off + len; 3393 while (off < endoff) { 3394 if (!blkmode) { 3395 int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 1); 3396 in.readFully(buf, 0, span << 1); 3397 stop = off + span; 3398 pos = 0; 3399 } else if (end - pos < 2) { 3400 v[off++] = din.readShort(); 3401 continue; 3402 } else { 3403 stop = Math.min(endoff, off + ((end - pos) >> 1)); 3404 } 3405 3406 while (off < stop) { 3407 v[off++] = Bits.getShort(buf, pos); 3408 pos += 2; 3409 } 3410 } 3411 } 3412 3413 void readInts(int[] v, int off, int len) throws IOException { 3414 int stop, endoff = off + len; 3415 while (off < endoff) { 3416 if (!blkmode) { 3417 int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 2); 3418 in.readFully(buf, 0, span << 2); 3419 stop = off + span; 3420 pos = 0; 3421 } else if (end - pos < 4) { 3422 v[off++] = din.readInt(); 3423 continue; 3424 } else { 3425 stop = Math.min(endoff, off + ((end - pos) >> 2)); 3426 } 3427 3428 while (off < stop) { 3429 v[off++] = Bits.getInt(buf, pos); 3430 pos += 4; 3431 } 3432 } 3433 } 3434 3435 void readFloats(float[] v, int off, int len) throws IOException { 3436 int span, endoff = off + len; 3437 while (off < endoff) { 3438 if (!blkmode) { 3439 span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 2); 3440 in.readFully(buf, 0, span << 2); 3441 pos = 0; 3442 } else if (end - pos < 4) { 3443 v[off++] = din.readFloat(); 3444 continue; 3445 } else { 3446 span = Math.min(endoff - off, ((end - pos) >> 2)); 3447 } 3448 3449 bytesToFloats(buf, pos, v, off, span); 3450 off += span; 3451 pos += span << 2; 3452 } 3453 } 3454 3455 void readLongs(long[] v, int off, int len) throws IOException { 3456 int stop, endoff = off + len; 3457 while (off < endoff) { 3458 if (!blkmode) { 3459 int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 3); 3460 in.readFully(buf, 0, span << 3); 3461 stop = off + span; 3462 pos = 0; 3463 } else if (end - pos < 8) { 3464 v[off++] = din.readLong(); 3465 continue; 3466 } else { 3467 stop = Math.min(endoff, off + ((end - pos) >> 3)); 3468 } 3469 3470 while (off < stop) { 3471 v[off++] = Bits.getLong(buf, pos); 3472 pos += 8; 3473 } 3474 } 3475 } 3476 3477 void readDoubles(double[] v, int off, int len) throws IOException { 3478 int span, endoff = off + len; 3479 while (off < endoff) { 3480 if (!blkmode) { 3481 span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 3); 3482 in.readFully(buf, 0, span << 3); 3483 pos = 0; 3484 } else if (end - pos < 8) { 3485 v[off++] = din.readDouble(); 3486 continue; 3487 } else { 3488 span = Math.min(endoff - off, ((end - pos) >> 3)); 3489 } 3490 3491 bytesToDoubles(buf, pos, v, off, span); 3492 off += span; 3493 pos += span << 3; 3494 } 3495 } 3496 3497 /** 3498 * Reads in string written in "long" UTF format. "Long" UTF format is 3499 * identical to standard UTF, except that it uses an 8 byte header 3500 * (instead of the standard 2 bytes) to convey the UTF encoding length. 3501 */ 3502 String readLongUTF() throws IOException { 3503 return readUTFBody(readLong()); 3504 } 3505 3506 /** 3507 * Reads in the "body" (i.e., the UTF representation minus the 2-byte 3508 * or 8-byte length header) of a UTF encoding, which occupies the next 3509 * utflen bytes. 3510 */ 3511 private String readUTFBody(long utflen) throws IOException { 3512 StringBuilder sbuf; 3513 if (utflen > 0 && utflen < Integer.MAX_VALUE) { 3514 // a reasonable initial capacity based on the UTF length 3515 int initialCapacity = Math.min((int)utflen, 0xFFFF); 3516 sbuf = new StringBuilder(initialCapacity); 3517 } else { 3518 sbuf = new StringBuilder(); 3519 } 3520 3521 if (!blkmode) { 3522 end = pos = 0; 3523 } 3524 3525 while (utflen > 0) { 3526 int avail = end - pos; 3527 if (avail >= 3 || (long) avail == utflen) { 3528 utflen -= readUTFSpan(sbuf, utflen); 3529 } else { 3530 if (blkmode) { 3531 // near block boundary, read one byte at a time 3532 utflen -= readUTFChar(sbuf, utflen); 3533 } else { 3534 // shift and refill buffer manually 3535 if (avail > 0) { 3536 System.arraycopy(buf, pos, buf, 0, avail); 3537 } 3538 pos = 0; 3539 end = (int) Math.min(MAX_BLOCK_SIZE, utflen); 3540 in.readFully(buf, avail, end - avail); 3541 } 3542 } 3543 } 3544 3545 return sbuf.toString(); 3546 } 3547 3548 /** 3549 * Reads span of UTF-encoded characters out of internal buffer 3550 * (starting at offset pos and ending at or before offset end), 3551 * consuming no more than utflen bytes. Appends read characters to 3552 * sbuf. Returns the number of bytes consumed. 3553 */ 3554 private long readUTFSpan(StringBuilder sbuf, long utflen) 3555 throws IOException 3556 { 3557 int cpos = 0; 3558 int start = pos; 3559 int avail = Math.min(end - pos, CHAR_BUF_SIZE); 3560 // stop short of last char unless all of utf bytes in buffer 3561 int stop = pos + ((utflen > avail) ? avail - 2 : (int) utflen); 3562 boolean outOfBounds = false; 3563 3564 try { 3565 while (pos < stop) { 3566 int b1, b2, b3; 3567 b1 = buf[pos++] & 0xFF; 3568 switch (b1 >> 4) { 3569 case 0: 3570 case 1: 3571 case 2: 3572 case 3: 3573 case 4: 3574 case 5: 3575 case 6: 3576 case 7: // 1 byte format: 0xxxxxxx 3577 cbuf[cpos++] = (char) b1; 3578 break; 3579 3580 case 12: 3581 case 13: // 2 byte format: 110xxxxx 10xxxxxx 3582 b2 = buf[pos++]; 3583 if ((b2 & 0xC0) != 0x80) { 3584 throw new UTFDataFormatException(); 3585 } 3586 cbuf[cpos++] = (char) (((b1 & 0x1F) << 6) | 3587 ((b2 & 0x3F) << 0)); 3588 break; 3589 3590 case 14: // 3 byte format: 1110xxxx 10xxxxxx 10xxxxxx 3591 b3 = buf[pos + 1]; 3592 b2 = buf[pos + 0]; 3593 pos += 2; 3594 if ((b2 & 0xC0) != 0x80 || (b3 & 0xC0) != 0x80) { 3595 throw new UTFDataFormatException(); 3596 } 3597 cbuf[cpos++] = (char) (((b1 & 0x0F) << 12) | 3598 ((b2 & 0x3F) << 6) | 3599 ((b3 & 0x3F) << 0)); 3600 break; 3601 3602 default: // 10xx xxxx, 1111 xxxx 3603 throw new UTFDataFormatException(); 3604 } 3605 } 3606 } catch (ArrayIndexOutOfBoundsException ex) { 3607 outOfBounds = true; 3608 } finally { 3609 if (outOfBounds || (pos - start) > utflen) { 3610 /* 3611 * Fix for 4450867: if a malformed utf char causes the 3612 * conversion loop to scan past the expected end of the utf 3613 * string, only consume the expected number of utf bytes. 3614 */ 3615 pos = start + (int) utflen; 3616 throw new UTFDataFormatException(); 3617 } 3618 } 3619 3620 sbuf.append(cbuf, 0, cpos); 3621 return pos - start; 3622 } 3623 3624 /** 3625 * Reads in single UTF-encoded character one byte at a time, appends 3626 * the character to sbuf, and returns the number of bytes consumed. 3627 * This method is used when reading in UTF strings written in block 3628 * data mode to handle UTF-encoded characters which (potentially) 3629 * straddle block-data boundaries. 3630 */ 3631 private int readUTFChar(StringBuilder sbuf, long utflen) 3632 throws IOException 3633 { 3634 int b1, b2, b3; 3635 b1 = readByte() & 0xFF; 3636 switch (b1 >> 4) { 3637 case 0: 3638 case 1: 3639 case 2: 3640 case 3: 3641 case 4: 3642 case 5: 3643 case 6: 3644 case 7: // 1 byte format: 0xxxxxxx 3645 sbuf.append((char) b1); 3646 return 1; 3647 3648 case 12: 3649 case 13: // 2 byte format: 110xxxxx 10xxxxxx 3650 if (utflen < 2) { 3651 throw new UTFDataFormatException(); 3652 } 3653 b2 = readByte(); 3654 if ((b2 & 0xC0) != 0x80) { 3655 throw new UTFDataFormatException(); 3656 } 3657 sbuf.append((char) (((b1 & 0x1F) << 6) | 3658 ((b2 & 0x3F) << 0))); 3659 return 2; 3660 3661 case 14: // 3 byte format: 1110xxxx 10xxxxxx 10xxxxxx 3662 if (utflen < 3) { 3663 if (utflen == 2) { 3664 readByte(); // consume remaining byte 3665 } 3666 throw new UTFDataFormatException(); 3667 } 3668 b2 = readByte(); 3669 b3 = readByte(); 3670 if ((b2 & 0xC0) != 0x80 || (b3 & 0xC0) != 0x80) { 3671 throw new UTFDataFormatException(); 3672 } 3673 sbuf.append((char) (((b1 & 0x0F) << 12) | 3674 ((b2 & 0x3F) << 6) | 3675 ((b3 & 0x3F) << 0))); 3676 return 3; 3677 3678 default: // 10xx xxxx, 1111 xxxx 3679 throw new UTFDataFormatException(); 3680 } 3681 } 3682 3683 /** 3684 * Returns the number of bytes read from the input stream. 3685 * @return the number of bytes read from the input stream 3686 */ 3687 long getBytesRead() { 3688 return in.getBytesRead(); 3689 } 3690 } 3691 3692 /** 3693 * Unsynchronized table which tracks wire handle to object mappings, as 3694 * well as ClassNotFoundExceptions associated with deserialized objects. 3695 * This class implements an exception-propagation algorithm for 3696 * determining which objects should have ClassNotFoundExceptions associated 3697 * with them, taking into account cycles and discontinuities (e.g., skipped 3698 * fields) in the object graph. 3699 * 3700 * <p>General use of the table is as follows: during deserialization, a 3701 * given object is first assigned a handle by calling the assign method. 3702 * This method leaves the assigned handle in an "open" state, wherein 3703 * dependencies on the exception status of other handles can be registered 3704 * by calling the markDependency method, or an exception can be directly 3705 * associated with the handle by calling markException. When a handle is 3706 * tagged with an exception, the HandleTable assumes responsibility for 3707 * propagating the exception to any other objects which depend 3708 * (transitively) on the exception-tagged object. 3709 * 3710 * <p>Once all exception information/dependencies for the handle have been 3711 * registered, the handle should be "closed" by calling the finish method 3712 * on it. The act of finishing a handle allows the exception propagation 3713 * algorithm to aggressively prune dependency links, lessening the 3714 * performance/memory impact of exception tracking. 3715 * 3716 * <p>Note that the exception propagation algorithm used depends on handles 3717 * being assigned/finished in LIFO order; however, for simplicity as well 3718 * as memory conservation, it does not enforce this constraint. 3719 */ 3720 // REMIND: add full description of exception propagation algorithm? 3721 private static class HandleTable { 3722 3723 /* status codes indicating whether object has associated exception */ 3724 private static final byte STATUS_OK = 1; 3725 private static final byte STATUS_UNKNOWN = 2; 3726 private static final byte STATUS_EXCEPTION = 3; 3727 3728 /** array mapping handle -> object status */ 3729 byte[] status; 3730 /** array mapping handle -> object/exception (depending on status) */ 3731 Object[] entries; 3732 /** array mapping handle -> list of dependent handles (if any) */ 3733 HandleList[] deps; 3734 /** lowest unresolved dependency */ 3735 int lowDep = -1; 3736 /** number of handles in table */ 3737 int size = 0; 3738 3739 /** 3740 * Creates handle table with the given initial capacity. 3741 */ 3742 HandleTable(int initialCapacity) { 3743 status = new byte[initialCapacity]; 3744 entries = new Object[initialCapacity]; 3745 deps = new HandleList[initialCapacity]; 3746 } 3747 3748 /** 3749 * Assigns next available handle to given object, and returns assigned 3750 * handle. Once object has been completely deserialized (and all 3751 * dependencies on other objects identified), the handle should be 3752 * "closed" by passing it to finish(). 3753 */ 3754 int assign(Object obj) { 3755 if (size >= entries.length) { 3756 grow(); 3757 } 3758 status[size] = STATUS_UNKNOWN; 3759 entries[size] = obj; 3760 return size++; 3761 } 3762 3763 /** 3764 * Registers a dependency (in exception status) of one handle on 3765 * another. The dependent handle must be "open" (i.e., assigned, but 3766 * not finished yet). No action is taken if either dependent or target 3767 * handle is NULL_HANDLE. Additionally, no action is taken if the 3768 * dependent and target are the same. 3769 */ 3770 void markDependency(int dependent, int target) { 3771 if (dependent == target || dependent == NULL_HANDLE || target == NULL_HANDLE) { 3772 return; 3773 } 3774 switch (status[dependent]) { 3775 3776 case STATUS_UNKNOWN: 3777 switch (status[target]) { 3778 case STATUS_OK: 3779 // ignore dependencies on objs with no exception 3780 break; 3781 3782 case STATUS_EXCEPTION: 3783 // eagerly propagate exception 3784 markException(dependent, 3785 (ClassNotFoundException) entries[target]); 3786 break; 3787 3788 case STATUS_UNKNOWN: 3789 // add to dependency list of target 3790 if (deps[target] == null) { 3791 deps[target] = new HandleList(); 3792 } 3793 deps[target].add(dependent); 3794 3795 // remember lowest unresolved target seen 3796 if (lowDep < 0 || lowDep > target) { 3797 lowDep = target; 3798 } 3799 break; 3800 3801 default: 3802 throw new InternalError(); 3803 } 3804 break; 3805 3806 case STATUS_EXCEPTION: 3807 break; 3808 3809 default: 3810 throw new InternalError(); 3811 } 3812 } 3813 3814 /** 3815 * Associates a ClassNotFoundException (if one not already associated) 3816 * with the currently active handle and propagates it to other 3817 * referencing objects as appropriate. The specified handle must be 3818 * "open" (i.e., assigned, but not finished yet). 3819 */ 3820 void markException(int handle, ClassNotFoundException ex) { 3821 switch (status[handle]) { 3822 case STATUS_UNKNOWN: 3823 status[handle] = STATUS_EXCEPTION; 3824 entries[handle] = ex; 3825 3826 // propagate exception to dependents 3827 HandleList dlist = deps[handle]; 3828 if (dlist != null) { 3829 int ndeps = dlist.size(); 3830 for (int i = 0; i < ndeps; i++) { 3831 markException(dlist.get(i), ex); 3832 } 3833 deps[handle] = null; 3834 } 3835 break; 3836 3837 case STATUS_EXCEPTION: 3838 break; 3839 3840 default: 3841 throw new InternalError(); 3842 } 3843 } 3844 3845 /** 3846 * Marks given handle as finished, meaning that no new dependencies 3847 * will be marked for handle. Calls to the assign and finish methods 3848 * must occur in LIFO order. 3849 */ 3850 void finish(int handle) { 3851 int end; 3852 if (lowDep < 0) { 3853 // no pending unknowns, only resolve current handle 3854 end = handle + 1; 3855 } else if (lowDep >= handle) { 3856 // pending unknowns now clearable, resolve all upward handles 3857 end = size; 3858 lowDep = -1; 3859 } else { 3860 // unresolved backrefs present, can't resolve anything yet 3861 return; 3862 } 3863 3864 // change STATUS_UNKNOWN -> STATUS_OK in selected span of handles 3865 for (int i = handle; i < end; i++) { 3866 switch (status[i]) { 3867 case STATUS_UNKNOWN: 3868 status[i] = STATUS_OK; 3869 deps[i] = null; 3870 break; 3871 3872 case STATUS_OK: 3873 case STATUS_EXCEPTION: 3874 break; 3875 3876 default: 3877 throw new InternalError(); 3878 } 3879 } 3880 } 3881 3882 /** 3883 * Assigns a new object to the given handle. The object previously 3884 * associated with the handle is forgotten. This method has no effect 3885 * if the given handle already has an exception associated with it. 3886 * This method may be called at any time after the handle is assigned. 3887 */ 3888 void setObject(int handle, Object obj) { 3889 switch (status[handle]) { 3890 case STATUS_UNKNOWN: 3891 case STATUS_OK: 3892 entries[handle] = obj; 3893 break; 3894 3895 case STATUS_EXCEPTION: 3896 break; 3897 3898 default: 3899 throw new InternalError(); 3900 } 3901 } 3902 3903 /** 3904 * Looks up and returns object associated with the given handle. 3905 * Returns null if the given handle is NULL_HANDLE, or if it has an 3906 * associated ClassNotFoundException. 3907 */ 3908 Object lookupObject(int handle) { 3909 return (handle != NULL_HANDLE && 3910 status[handle] != STATUS_EXCEPTION) ? 3911 entries[handle] : null; 3912 } 3913 3914 /** 3915 * Looks up and returns ClassNotFoundException associated with the 3916 * given handle. Returns null if the given handle is NULL_HANDLE, or 3917 * if there is no ClassNotFoundException associated with the handle. 3918 */ 3919 ClassNotFoundException lookupException(int handle) { 3920 return (handle != NULL_HANDLE && 3921 status[handle] == STATUS_EXCEPTION) ? 3922 (ClassNotFoundException) entries[handle] : null; 3923 } 3924 3925 /** 3926 * Resets table to its initial state. 3927 */ 3928 void clear() { 3929 Arrays.fill(status, 0, size, (byte) 0); 3930 Arrays.fill(entries, 0, size, null); 3931 Arrays.fill(deps, 0, size, null); 3932 lowDep = -1; 3933 size = 0; 3934 } 3935 3936 /** 3937 * Returns number of handles registered in table. 3938 */ 3939 int size() { 3940 return size; 3941 } 3942 3943 /** 3944 * Expands capacity of internal arrays. 3945 */ 3946 private void grow() { 3947 int newCapacity = (entries.length << 1) + 1; 3948 3949 byte[] newStatus = new byte[newCapacity]; 3950 Object[] newEntries = new Object[newCapacity]; 3951 HandleList[] newDeps = new HandleList[newCapacity]; 3952 3953 System.arraycopy(status, 0, newStatus, 0, size); 3954 System.arraycopy(entries, 0, newEntries, 0, size); 3955 System.arraycopy(deps, 0, newDeps, 0, size); 3956 3957 status = newStatus; 3958 entries = newEntries; 3959 deps = newDeps; 3960 } 3961 3962 /** 3963 * Simple growable list of (integer) handles. 3964 */ 3965 private static class HandleList { 3966 private int[] list = new int[4]; 3967 private int size = 0; 3968 3969 public HandleList() { 3970 } 3971 3972 public void add(int handle) { 3973 if (size >= list.length) { 3974 int[] newList = new int[list.length << 1]; 3975 System.arraycopy(list, 0, newList, 0, list.length); 3976 list = newList; 3977 } 3978 list[size++] = handle; 3979 } 3980 3981 public int get(int index) { 3982 if (index >= size) { 3983 throw new ArrayIndexOutOfBoundsException(); 3984 } 3985 return list[index]; 3986 } 3987 3988 public int size() { 3989 return size; 3990 } 3991 } 3992 } 3993 3994 /** 3995 * Method for cloning arrays in case of using unsharing reading 3996 */ 3997 private static Object cloneArray(Object array) { 3998 if (array instanceof Object[]) { 3999 return ((Object[]) array).clone(); 4000 } else if (array instanceof boolean[]) { 4001 return ((boolean[]) array).clone(); 4002 } else if (array instanceof byte[]) { 4003 return ((byte[]) array).clone(); 4004 } else if (array instanceof char[]) { 4005 return ((char[]) array).clone(); 4006 } else if (array instanceof double[]) { 4007 return ((double[]) array).clone(); 4008 } else if (array instanceof float[]) { 4009 return ((float[]) array).clone(); 4010 } else if (array instanceof int[]) { 4011 return ((int[]) array).clone(); 4012 } else if (array instanceof long[]) { 4013 return ((long[]) array).clone(); 4014 } else if (array instanceof short[]) { 4015 return ((short[]) array).clone(); 4016 } else { 4017 throw new AssertionError(); 4018 } 4019 } 4020 4021 static { 4022 SharedSecrets.setJavaObjectInputStreamAccess(ObjectInputStream::checkArray); 4023 } 4024 4025 }