ObjectOutputStream and ObjectInputStream can provide an application with + * persistent storage for graphs of objects when used with a FileOutputStream + * and FileInputStream respectively. ObjectInputStream is used to recover + * those objects previously serialized. Other uses include passing objects + * between hosts using a socket stream or for marshaling and unmarshaling + * arguments and parameters in a remote communication system. + * + *
ObjectInputStream ensures that the types of all objects in the graph + * created from the stream match the classes present in the Java Virtual + * Machine. Classes are loaded as required using the standard mechanisms. + * + *
Only objects that support the java.io.Serializable or + * java.io.Externalizable interface can be read from streams. + * + *
The method readObject is used to read an object from the
+ * stream. Java's safe casting should be used to get the desired type. In
+ * Java, strings and arrays are objects and are treated as objects during
+ * serialization. When read they need to be cast to the expected type.
+ *
+ *
Primitive data types can be read from the stream using the appropriate + * method on DataInput. + * + *
The default deserialization mechanism for objects restores the contents + * of each field to the value and type it had when it was written. Fields + * declared as transient or static are ignored by the deserialization process. + * References to other objects cause those objects to be read from the stream + * as necessary. Graphs of objects are restored correctly using a reference + * sharing mechanism. New objects are always allocated when deserializing, + * which prevents existing objects from being overwritten. + * + *
Reading an object is analogous to running the constructors of a new + * object. Memory is allocated for the object and initialized to zero (NULL). + * No-arg constructors are invoked for the non-serializable classes and then + * the fields of the serializable classes are restored from the stream starting + * with the serializable class closest to java.lang.object and finishing with + * the object's most specific class. + * + *
For example to read from a stream as written by the example in
+ * ObjectOutputStream:
+ *
+ *
+ * FileInputStream fis = new FileInputStream("t.tmp");
+ * ObjectInputStream ois = new ObjectInputStream(fis);
+ *
+ * int i = ois.readInt();
+ * String today = (String) ois.readObject();
+ * Date date = (Date) ois.readObject();
+ *
+ * ois.close();
+ *
+ *
+ * Classes control how they are serialized by implementing either the + * java.io.Serializable or java.io.Externalizable interfaces. + * + *
Implementing the Serializable interface allows object serialization to + * save and restore the entire state of the object and it allows classes to + * evolve between the time the stream is written and the time it is read. It + * automatically traverses references between objects, saving and restoring + * entire graphs. + * + *
Serializable classes that require special handling during the + * serialization and deserialization process should implement the following + * methods:
+ * + *
+ * private void writeObject(java.io.ObjectOutputStream stream) + * throws IOException; + * private void readObject(java.io.ObjectInputStream stream) + * throws IOException, ClassNotFoundException; + * private void readObjectNoData() + * throws ObjectStreamException; + *+ * + *
The readObject method is responsible for reading and restoring the state + * of the object for its particular class using data written to the stream by + * the corresponding writeObject method. The method does not need to concern + * itself with the state belonging to its superclasses or subclasses. State is + * restored by reading data from the ObjectInputStream for the individual + * fields and making assignments to the appropriate fields of the object. + * Reading primitive data types is supported by DataInput. + * + *
Any attempt to read object data which exceeds the boundaries of the + * custom data written by the corresponding writeObject method will cause an + * OptionalDataException to be thrown with an eof field value of true. + * Non-object reads which exceed the end of the allotted data will reflect the + * end of data in the same way that they would indicate the end of the stream: + * bytewise reads will return -1 as the byte read or number of bytes read, and + * primitive reads will throw EOFExceptions. If there is no corresponding + * writeObject method, then the end of default serialized data marks the end of + * the allotted data. + * + *
Primitive and object read calls issued from within a readExternal method
+ * behave in the same manner--if the stream is already positioned at the end of
+ * data written by the corresponding writeExternal method, object reads will
+ * throw OptionalDataExceptions with eof set to true, bytewise reads will
+ * return -1, and primitive reads will throw EOFExceptions. Note that this
+ * behavior does not hold for streams written with the old
+ * ObjectStreamConstants.PROTOCOL_VERSION_1 protocol, in which the
+ * end of data written by writeExternal methods is not demarcated, and hence
+ * cannot be detected.
+ *
+ *
The readObjectNoData method is responsible for initializing the state of + * the object for its particular class in the event that the serialization + * stream does not list the given class as a superclass of the object being + * deserialized. This may occur in cases where the receiving party uses a + * different version of the deserialized instance's class than the sending + * party, and the receiver's version extends classes that are not extended by + * the sender's version. This may also occur if the serialization stream has + * been tampered; hence, readObjectNoData is useful for initializing + * deserialized objects properly despite a "hostile" or incomplete source + * stream. + * + *
Serialization does not read or assign values to the fields of any object + * that does not implement the java.io.Serializable interface. Subclasses of + * Objects that are not serializable can be serializable. In this case the + * non-serializable class must have a no-arg constructor to allow its fields to + * be initialized. In this case it is the responsibility of the subclass to + * save and restore the state of the non-serializable class. It is frequently + * the case that the fields of that class are accessible (public, package, or + * protected) or that there are get and set methods that can be used to restore + * the state. + * + *
Any exception that occurs while deserializing an object will be caught by + * the ObjectInputStream and abort the reading process. + * + *
Implementing the Externalizable interface allows the object to assume + * complete control over the contents and format of the object's serialized + * form. The methods of the Externalizable interface, writeExternal and + * readExternal, are called to save and restore the objects state. When + * implemented by a class they can write and read their own state using all of + * the methods of ObjectOutput and ObjectInput. It is the responsibility of + * the objects to handle any versioning that occurs. + * + *
Enum constants are deserialized differently than ordinary serializable or
+ * externalizable objects. The serialized form of an enum constant consists
+ * solely of its name; field values of the constant are not transmitted. To
+ * deserialize an enum constant, ObjectInputStream reads the constant name from
+ * the stream; the deserialized constant is then obtained by calling the static
+ * method If a security manager is installed, this constructor will check for
+ * the "enableSubclassImplementation" SerializablePermission when invoked
+ * directly or indirectly by the constructor of a subclass which overrides
+ * the ObjectInputStream.readFields or ObjectInputStream.readUnshared
+ * methods.
+ *
+ * @param in input stream to read from
+ * @throws StreamCorruptedException if the stream header is incorrect
+ * @throws IOException if an I/O error occurs while reading stream header
+ * @throws SecurityException if untrusted subclass illegally overrides
+ * security-sensitive methods
+ * @throws NullPointerException if If there is a security manager installed, this method first calls the
+ * security manager's The root object is completely restored when all of its fields and the
+ * objects it references are completely restored. At this point the object
+ * validation callbacks are executed in order based on their registered
+ * priorities. The callbacks are registered by objects (in the readObject
+ * special methods) as they are individually restored.
+ *
+ * Exceptions are thrown for problems with the InputStream and for
+ * classes that should not be deserialized. All exceptions are fatal to
+ * the InputStream and leave it in an indeterminate state; it is up to the
+ * caller to ignore or recover the stream state.
+ *
+ * @throws ClassNotFoundException Class of a serialized object cannot be
+ * found.
+ * @throws InvalidClassException Something is wrong with a class used by
+ * serialization.
+ * @throws StreamCorruptedException Control information in the
+ * stream is inconsistent.
+ * @throws OptionalDataException Primitive data was found in the
+ * stream instead of objects.
+ * @throws IOException Any of the usual Input/Output related exceptions.
+ */
+ public final Object readObject()
+ throws IOException, ClassNotFoundException
+ {
+ throw new IOException();
+ }
+
+ /**
+ * This method is called by trusted subclasses of ObjectOutputStream that
+ * constructed ObjectOutputStream using the protected no-arg constructor.
+ * The subclass is expected to provide an override method with the modifier
+ * "final".
+ *
+ * @return the Object read from the stream.
+ * @throws ClassNotFoundException Class definition of a serialized object
+ * cannot be found.
+ * @throws OptionalDataException Primitive data was found in the stream
+ * instead of objects.
+ * @throws IOException if I/O errors occurred while reading from the
+ * underlying stream
+ * @see #ObjectInputStream()
+ * @see #readObject()
+ * @since 1.2
+ */
+ protected Object readObjectOverride()
+ throws IOException, ClassNotFoundException
+ {
+ return null;
+ }
+
+ /**
+ * Reads an "unshared" object from the ObjectInputStream. This method is
+ * identical to readObject, except that it prevents subsequent calls to
+ * readObject and readUnshared from returning additional references to the
+ * deserialized instance obtained via this call. Specifically:
+ * ObjectInputStream subclasses which override this method can only be
+ * constructed in security contexts possessing the
+ * "enableSubclassImplementation" SerializablePermission; any attempt to
+ * instantiate such a subclass without this permission will cause a
+ * SecurityException to be thrown.
+ *
+ * @return reference to deserialized object
+ * @throws ClassNotFoundException if class of an object to deserialize
+ * cannot be found
+ * @throws StreamCorruptedException if control information in the stream
+ * is inconsistent
+ * @throws ObjectStreamException if object to deserialize has already
+ * appeared in stream
+ * @throws OptionalDataException if primitive data is next in stream
+ * @throws IOException if an I/O error occurs during deserialization
+ * @since 1.4
+ */
+ public Object readUnshared() throws IOException, ClassNotFoundException {
+ // if nested read, passHandle contains handle of enclosing object
+ int outerHandle = passHandle;
+ try {
+ Object obj = readObject0(true);
+ handles.markDependency(outerHandle, passHandle);
+ ClassNotFoundException ex = handles.lookupException(passHandle);
+ if (ex != null) {
+ throw ex;
+ }
+ if (depth == 0) {
+ vlist.doCallbacks();
+ }
+ return obj;
+ } finally {
+ passHandle = outerHandle;
+ if (closed && depth == 0) {
+ clear();
+ }
+ }
+ }
+
+ /**
+ * Read the non-static and non-transient fields of the current class from
+ * this stream. This may only be called from the readObject method of the
+ * class being deserialized. It will throw the NotActiveException if it is
+ * called otherwise.
+ *
+ * @throws ClassNotFoundException if the class of a serialized object
+ * could not be found.
+ * @throws IOException if an I/O error occurs.
+ * @throws NotActiveException if the stream is not currently reading
+ * objects.
+ */
+ public void defaultReadObject()
+ throws IOException, ClassNotFoundException
+ {
+ if (curContext == null) {
+ throw new NotActiveException("not in call to readObject");
+ }
+ Object curObj = null; // curContext.getObj();
+ ObjectStreamClass curDesc = null; // curContext.getDesc();
+ bin.setBlockDataMode(false);
+ defaultReadFields(curObj, curDesc);
+ bin.setBlockDataMode(true);
+ if (!curDesc.hasWriteObjectData()) {
+ /*
+ * Fix for 4360508: since stream does not contain terminating
+ * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere
+ * knows to simulate end-of-custom-data behavior.
+ */
+ defaultDataEnd = true;
+ }
+ ClassNotFoundException ex = handles.lookupException(passHandle);
+ if (ex != null) {
+ throw ex;
+ }
+ }
+
+ /**
+ * Reads the persistent fields from the stream and makes them available by
+ * name.
+ *
+ * @return the The corresponding method in The default implementation of this method in
+ * This method is called exactly once for each unique proxy class
+ * descriptor in the stream.
+ *
+ * The corresponding method in The default implementation of this method in
+ * This method is called after an object has been read but before it is
+ * returned from readObject. The default resolveObject method just returns
+ * the same object.
+ *
+ * When a subclass is replacing objects it must insure that the
+ * substituted object is compatible with every field where the reference
+ * will be stored. Objects whose type is not a subclass of the type of the
+ * field or array element abort the serialization by raising an exception
+ * and the object is not be stored.
+ *
+ * This method is called only once when each object is first
+ * encountered. All subsequent references to the object will be redirected
+ * to the new object.
+ *
+ * @param obj object to be substituted
+ * @return the substituted object
+ * @throws IOException Any of the usual Input/Output exceptions.
+ */
+ protected Object resolveObject(Object obj) throws IOException {
+ return obj;
+ }
+
+ /**
+ * Enable the stream to allow objects read from the stream to be replaced.
+ * When enabled, the resolveObject method is called for every object being
+ * deserialized.
+ *
+ * If enable is true, and there is a security manager installed,
+ * this method first calls the security manager's
+ * General use of the table is as follows: during deserialization, a
+ * given object is first assigned a handle by calling the assign method.
+ * This method leaves the assigned handle in an "open" state, wherein
+ * dependencies on the exception status of other handles can be registered
+ * by calling the markDependency method, or an exception can be directly
+ * associated with the handle by calling markException. When a handle is
+ * tagged with an exception, the HandleTable assumes responsibility for
+ * propagating the exception to any other objects which depend
+ * (transitively) on the exception-tagged object.
+ *
+ * Once all exception information/dependencies for the handle have been
+ * registered, the handle should be "closed" by calling the finish method
+ * on it. The act of finishing a handle allows the exception propagation
+ * algorithm to aggressively prune dependency links, lessening the
+ * performance/memory impact of exception tracking.
+ *
+ * Note that the exception propagation algorithm used depends on handles
+ * being assigned/finished in LIFO order; however, for simplicity as well
+ * as memory conservation, it does not enforce this constraint.
+ */
+ // REMIND: add full description of exception propagation algorithm?
+ private static class HandleTable {
+
+ /* status codes indicating whether object has associated exception */
+ private static final byte STATUS_OK = 1;
+ private static final byte STATUS_UNKNOWN = 2;
+ private static final byte STATUS_EXCEPTION = 3;
+
+ /** array mapping handle -> object status */
+ byte[] status;
+ /** array mapping handle -> object/exception (depending on status) */
+ Object[] entries;
+ /** array mapping handle -> list of dependent handles (if any) */
+ HandleList[] deps;
+ /** lowest unresolved dependency */
+ int lowDep = -1;
+ /** number of handles in table */
+ int size = 0;
+
+ /**
+ * Creates handle table with the given initial capacity.
+ */
+ HandleTable(int initialCapacity) {
+ status = new byte[initialCapacity];
+ entries = new Object[initialCapacity];
+ deps = new HandleList[initialCapacity];
+ }
+
+ /**
+ * Assigns next available handle to given object, and returns assigned
+ * handle. Once object has been completely deserialized (and all
+ * dependencies on other objects identified), the handle should be
+ * "closed" by passing it to finish().
+ */
+ int assign(Object obj) {
+ if (size >= entries.length) {
+ grow();
+ }
+ status[size] = STATUS_UNKNOWN;
+ entries[size] = obj;
+ return size++;
+ }
+
+ /**
+ * Registers a dependency (in exception status) of one handle on
+ * another. The dependent handle must be "open" (i.e., assigned, but
+ * not finished yet). No action is taken if either dependent or target
+ * handle is NULL_HANDLE.
+ */
+ void markDependency(int dependent, int target) {
+ if (dependent == NULL_HANDLE || target == NULL_HANDLE) {
+ return;
+ }
+ switch (status[dependent]) {
+
+ case STATUS_UNKNOWN:
+ switch (status[target]) {
+ case STATUS_OK:
+ // ignore dependencies on objs with no exception
+ break;
+
+ case STATUS_EXCEPTION:
+ // eagerly propagate exception
+ markException(dependent,
+ (ClassNotFoundException) entries[target]);
+ break;
+
+ case STATUS_UNKNOWN:
+ // add to dependency list of target
+ if (deps[target] == null) {
+ deps[target] = new HandleList();
+ }
+ deps[target].add(dependent);
+
+ // remember lowest unresolved target seen
+ if (lowDep < 0 || lowDep > target) {
+ lowDep = target;
+ }
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ break;
+
+ case STATUS_EXCEPTION:
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+
+ /**
+ * Associates a ClassNotFoundException (if one not already associated)
+ * with the currently active handle and propagates it to other
+ * referencing objects as appropriate. The specified handle must be
+ * "open" (i.e., assigned, but not finished yet).
+ */
+ void markException(int handle, ClassNotFoundException ex) {
+ switch (status[handle]) {
+ case STATUS_UNKNOWN:
+ status[handle] = STATUS_EXCEPTION;
+ entries[handle] = ex;
+
+ // propagate exception to dependents
+ HandleList dlist = deps[handle];
+ if (dlist != null) {
+ int ndeps = dlist.size();
+ for (int i = 0; i < ndeps; i++) {
+ markException(dlist.get(i), ex);
+ }
+ deps[handle] = null;
+ }
+ break;
+
+ case STATUS_EXCEPTION:
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+
+ /**
+ * Marks given handle as finished, meaning that no new dependencies
+ * will be marked for handle. Calls to the assign and finish methods
+ * must occur in LIFO order.
+ */
+ void finish(int handle) {
+ int end;
+ if (lowDep < 0) {
+ // no pending unknowns, only resolve current handle
+ end = handle + 1;
+ } else if (lowDep >= handle) {
+ // pending unknowns now clearable, resolve all upward handles
+ end = size;
+ lowDep = -1;
+ } else {
+ // unresolved backrefs present, can't resolve anything yet
+ return;
+ }
+
+ // change STATUS_UNKNOWN -> STATUS_OK in selected span of handles
+ for (int i = handle; i < end; i++) {
+ switch (status[i]) {
+ case STATUS_UNKNOWN:
+ status[i] = STATUS_OK;
+ deps[i] = null;
+ break;
+
+ case STATUS_OK:
+ case STATUS_EXCEPTION:
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ }
+
+ /**
+ * Assigns a new object to the given handle. The object previously
+ * associated with the handle is forgotten. This method has no effect
+ * if the given handle already has an exception associated with it.
+ * This method may be called at any time after the handle is assigned.
+ */
+ void setObject(int handle, Object obj) {
+ switch (status[handle]) {
+ case STATUS_UNKNOWN:
+ case STATUS_OK:
+ entries[handle] = obj;
+ break;
+
+ case STATUS_EXCEPTION:
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+
+ /**
+ * Looks up and returns object associated with the given handle.
+ * Returns null if the given handle is NULL_HANDLE, or if it has an
+ * associated ClassNotFoundException.
+ */
+ Object lookupObject(int handle) {
+ return (handle != NULL_HANDLE &&
+ status[handle] != STATUS_EXCEPTION) ?
+ entries[handle] : null;
+ }
+
+ /**
+ * Looks up and returns ClassNotFoundException associated with the
+ * given handle. Returns null if the given handle is NULL_HANDLE, or
+ * if there is no ClassNotFoundException associated with the handle.
+ */
+ ClassNotFoundException lookupException(int handle) {
+ return (handle != NULL_HANDLE &&
+ status[handle] == STATUS_EXCEPTION) ?
+ (ClassNotFoundException) entries[handle] : null;
+ }
+
+ /**
+ * Resets table to its initial state.
+ */
+ void clear() {
+ Arrays.fill(status, 0, size, (byte) 0);
+ Arrays.fill(entries, 0, size, null);
+ Arrays.fill(deps, 0, size, null);
+ lowDep = -1;
+ size = 0;
+ }
+
+ /**
+ * Returns number of handles registered in table.
+ */
+ int size() {
+ return size;
+ }
+
+ /**
+ * Expands capacity of internal arrays.
+ */
+ private void grow() {
+ int newCapacity = (entries.length << 1) + 1;
+
+ byte[] newStatus = new byte[newCapacity];
+ Object[] newEntries = new Object[newCapacity];
+ HandleList[] newDeps = new HandleList[newCapacity];
+
+ System.arraycopy(status, 0, newStatus, 0, size);
+ System.arraycopy(entries, 0, newEntries, 0, size);
+ System.arraycopy(deps, 0, newDeps, 0, size);
+
+ status = newStatus;
+ entries = newEntries;
+ deps = newDeps;
+ }
+
+ /**
+ * Simple growable list of (integer) handles.
+ */
+ private static class HandleList {
+ private int[] list = new int[4];
+ private int size = 0;
+
+ public HandleList() {
+ }
+
+ public void add(int handle) {
+ if (size >= list.length) {
+ int[] newList = new int[list.length << 1];
+ System.arraycopy(list, 0, newList, 0, list.length);
+ list = newList;
+ }
+ list[size++] = handle;
+ }
+
+ public int get(int index) {
+ if (index >= size) {
+ throw new ArrayIndexOutOfBoundsException();
+ }
+ return list[index];
+ }
+
+ public int size() {
+ return size;
+ }
+ }
+ }
+
+ /**
+ * Method for cloning arrays in case of using unsharing reading
+ */
+ private static Object cloneArray(Object array) {
+ if (array instanceof Object[]) {
+ return ((Object[]) array).clone();
+ } else if (array instanceof boolean[]) {
+ return ((boolean[]) array).clone();
+ } else if (array instanceof byte[]) {
+ return ((byte[]) array).clone();
+ } else if (array instanceof char[]) {
+ return ((char[]) array).clone();
+ } else if (array instanceof double[]) {
+ return ((double[]) array).clone();
+ } else if (array instanceof float[]) {
+ return ((float[]) array).clone();
+ } else if (array instanceof int[]) {
+ return ((int[]) array).clone();
+ } else if (array instanceof long[]) {
+ return ((long[]) array).clone();
+ } else if (array instanceof short[]) {
+ return ((short[]) array).clone();
+ } else {
+ throw new AssertionError();
+ }
+ }
+
+}
Enum.valueOf(Class, String) with the enum constant's
+ * base type and the received constant name as arguments. Like other
+ * serializable or externalizable objects, enum constants can function as the
+ * targets of back references appearing subsequently in the serialization
+ * stream. The process by which enum constants are deserialized cannot be
+ * customized: any class-specific readObject, readObjectNoData, and readResolve
+ * methods defined by enum types are ignored during deserialization.
+ * Similarly, any serialPersistentFields or serialVersionUID field declarations
+ * are also ignored--all enum types have a fixed serialVersionUID of 0L.
+ *
+ * @author Mike Warres
+ * @author Roger Riggs
+ * @see java.io.DataInput
+ * @see java.io.ObjectOutputStream
+ * @see java.io.Serializable
+ * @see Object Serialization Specification, Section 3, Object Input Classes
+ * @since JDK1.1
+ */
+public class ObjectInputStream
+ extends InputStream implements ObjectInput, ObjectStreamConstants
+{
+ /** handle value representing null */
+ private static final int NULL_HANDLE = -1;
+
+ /** marker for unshared objects in internal handle table */
+ private static final Object unsharedMarker = new Object();
+
+ /** table mapping primitive type names to corresponding class objects */
+ private static final HashMapin is null
+ * @see ObjectInputStream#ObjectInputStream()
+ * @see ObjectInputStream#readFields()
+ * @see ObjectOutputStream#ObjectOutputStream(OutputStream)
+ */
+ public ObjectInputStream(InputStream in) throws IOException {
+ verifySubclass();
+ bin = new BlockDataInputStream(in);
+ handles = new HandleTable(10);
+ vlist = new ValidationList();
+ enableOverride = false;
+ readStreamHeader();
+ bin.setBlockDataMode(true);
+ }
+
+ /**
+ * Provide a way for subclasses that are completely reimplementing
+ * ObjectInputStream to not have to allocate private data just used by this
+ * implementation of ObjectInputStream.
+ *
+ * checkPermission method with the
+ * SerializablePermission("enableSubclassImplementation")
+ * permission to ensure it's ok to enable subclassing.
+ *
+ * @throws SecurityException if a security manager exists and its
+ * checkPermission method denies enabling
+ * subclassing.
+ * @see SecurityManager#checkPermission
+ * @see java.io.SerializablePermission
+ */
+ protected ObjectInputStream() throws IOException, SecurityException {
+ throw new SecurityException();
+ }
+
+ /**
+ * Read an object from the ObjectInputStream. The class of the object, the
+ * signature of the class, and the values of the non-transient and
+ * non-static fields of the class and all of its supertypes are read.
+ * Default deserializing for a class can be overriden using the writeObject
+ * and readObject methods. Objects referenced by this object are read
+ * transitively so that a complete equivalent graph of objects is
+ * reconstructed by readObject.
+ *
+ *
+ *
+ * Deserializing an object via readUnshared invalidates the stream handle
+ * associated with the returned object. Note that this in itself does not
+ * always guarantee that the reference returned by readUnshared is unique;
+ * the deserialized object may define a readResolve method which returns an
+ * object visible to other parties, or readUnshared may return a Class
+ * object or enum constant obtainable elsewhere in the stream or through
+ * external means. If the deserialized object defines a readResolve method
+ * and the invocation of that method returns an array, then readUnshared
+ * returns a shallow clone of that array; this guarantees that the returned
+ * array object is unique and cannot be obtained a second time from an
+ * invocation of readObject or readUnshared on the ObjectInputStream,
+ * even if the underlying data stream has been manipulated.
+ *
+ * GetField object representing the persistent
+ * fields of the object being deserialized
+ * @throws ClassNotFoundException if the class of a serialized object
+ * could not be found.
+ * @throws IOException if an I/O error occurs.
+ * @throws NotActiveException if the stream is not currently reading
+ * objects.
+ * @since 1.2
+ */
+ public ObjectInputStream.GetField readFields()
+ throws IOException, ClassNotFoundException
+ {
+ if (curContext == null) {
+ throw new NotActiveException("not in call to readObject");
+ }
+ Object curObj = null; // curContext.getObj();
+ ObjectStreamClass curDesc = null; // curContext.getDesc();
+ bin.setBlockDataMode(false);
+ GetFieldImpl getField = new GetFieldImpl(curDesc);
+ getField.readFields();
+ bin.setBlockDataMode(true);
+ if (!curDesc.hasWriteObjectData()) {
+ /*
+ * Fix for 4360508: since stream does not contain terminating
+ * TC_ENDBLOCKDATA tag, set flag so that reading code elsewhere
+ * knows to simulate end-of-custom-data behavior.
+ */
+ defaultDataEnd = true;
+ }
+
+ return getField;
+ }
+
+ /**
+ * Register an object to be validated before the graph is returned. While
+ * similar to resolveObject these validations are called after the entire
+ * graph has been reconstituted. Typically, a readObject method will
+ * register the object with the stream so that when all of the objects are
+ * restored a final set of validations can be performed.
+ *
+ * @param obj the object to receive the validation callback.
+ * @param prio controls the order of callbacks;zero is a good default.
+ * Use higher numbers to be called back earlier, lower numbers for
+ * later callbacks. Within a priority, callbacks are processed in
+ * no particular order.
+ * @throws NotActiveException The stream is not currently reading objects
+ * so it is invalid to register a callback.
+ * @throws InvalidObjectException The validation object is null.
+ */
+ public void registerValidation(ObjectInputValidation obj, int prio)
+ throws NotActiveException, InvalidObjectException
+ {
+ if (depth == 0) {
+ throw new NotActiveException("stream inactive");
+ }
+ vlist.register(obj, prio);
+ }
+
+ /**
+ * Load the local class equivalent of the specified stream class
+ * description. Subclasses may implement this method to allow classes to
+ * be fetched from an alternate source.
+ *
+ * ObjectOutputStream is
+ * annotateClass. This method will be invoked only once for
+ * each unique class in the stream. This method can be implemented by
+ * subclasses to use an alternate loading mechanism but must return a
+ * Class object. Once returned, if the class is not an array
+ * class, its serialVersionUID is compared to the serialVersionUID of the
+ * serialized class, and if there is a mismatch, the deserialization fails
+ * and an {@link InvalidClassException} is thrown.
+ *
+ * ObjectInputStream returns the result of calling
+ *
+ * Class.forName(desc.getName(), false, loader)
+ *
+ * where loader is determined as follows: if there is a
+ * method on the current thread's stack whose declaring class was
+ * defined by a user-defined class loader (and was not a generated to
+ * implement reflective invocations), then loader is class
+ * loader corresponding to the closest such method to the currently
+ * executing frame; otherwise, loader is
+ * null. If this call results in a
+ * ClassNotFoundException and the name of the passed
+ * ObjectStreamClass instance is the Java language keyword
+ * for a primitive type or void, then the Class object
+ * representing that primitive type or void will be returned
+ * (e.g., an ObjectStreamClass with the name
+ * "int" will be resolved to Integer.TYPE).
+ * Otherwise, the ClassNotFoundException will be thrown to
+ * the caller of this method.
+ *
+ * @param desc an instance of class ObjectStreamClass
+ * @return a Class object corresponding to desc
+ * @throws IOException any of the usual Input/Output exceptions.
+ * @throws ClassNotFoundException if class of a serialized object cannot
+ * be found.
+ */
+ protected Class resolveClass(ObjectStreamClass desc)
+ throws IOException, ClassNotFoundException
+ {
+ String name = desc.getName();
+ try {
+ return Class.forName(name, false, latestUserDefinedLoader());
+ } catch (ClassNotFoundException ex) {
+ Class cl = primClasses.get(name);
+ if (cl != null) {
+ return cl;
+ } else {
+ throw ex;
+ }
+ }
+ }
+
+ /**
+ * Returns a proxy class that implements the interfaces named in a proxy
+ * class descriptor; subclasses may implement this method to read custom
+ * data from the stream along with the descriptors for dynamic proxy
+ * classes, allowing them to use an alternate loading mechanism for the
+ * interfaces and the proxy class.
+ *
+ * ObjectOutputStream is
+ * annotateProxyClass. For a given subclass of
+ * ObjectInputStream that overrides this method, the
+ * annotateProxyClass method in the corresponding subclass of
+ * ObjectOutputStream must write any data or objects read by
+ * this method.
+ *
+ * ObjectInputStream returns the result of calling
+ * Proxy.getProxyClass with the list of Class
+ * objects for the interfaces that are named in the interfaces
+ * parameter. The Class object for each interface name
+ * i is the value returned by calling
+ *
+ * Class.forName(i, false, loader)
+ *
+ * where loader is that of the first non-null
+ * class loader up the execution stack, or null if no
+ * non-null class loaders are on the stack (the same class
+ * loader choice used by the resolveClass method). Unless any
+ * of the resolved interfaces are non-public, this same value of
+ * loader is also the class loader passed to
+ * Proxy.getProxyClass; if non-public interfaces are present,
+ * their class loader is passed instead (if more than one non-public
+ * interface class loader is encountered, an
+ * IllegalAccessError is thrown).
+ * If Proxy.getProxyClass throws an
+ * IllegalArgumentException, resolveProxyClass
+ * will throw a ClassNotFoundException containing the
+ * IllegalArgumentException.
+ *
+ * @param interfaces the list of interface names that were
+ * deserialized in the proxy class descriptor
+ * @return a proxy class for the specified interfaces
+ * @throws IOException any exception thrown by the underlying
+ * InputStream
+ * @throws ClassNotFoundException if the proxy class or any of the
+ * named interfaces could not be found
+ * @see ObjectOutputStream#annotateProxyClass(Class)
+ * @since 1.3
+ */
+ protected Class resolveProxyClass(String[] interfaces)
+ throws IOException, ClassNotFoundException
+ {
+ ClassLoader latestLoader = latestUserDefinedLoader();
+ ClassLoader nonPublicLoader = null;
+ boolean hasNonPublicInterface = false;
+
+ // define proxy in class loader of non-public interface(s), if any
+ Class[] classObjs = new Class[interfaces.length];
+ for (int i = 0; i < interfaces.length; i++) {
+ Class cl = Class.forName(interfaces[i], false, latestLoader);
+ if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
+ if (hasNonPublicInterface) {
+ if (nonPublicLoader != cl.getClassLoader()) {
+ throw new IllegalAccessError(
+ "conflicting non-public interface class loaders");
+ }
+ } else {
+ nonPublicLoader = cl.getClassLoader();
+ hasNonPublicInterface = true;
+ }
+ }
+ classObjs[i] = cl;
+ }
+ try {
+ return Proxy.getProxyClass(
+ hasNonPublicInterface ? nonPublicLoader : latestLoader,
+ classObjs);
+ } catch (IllegalArgumentException e) {
+ throw new ClassNotFoundException(null, e);
+ }
+ }
+
+ /**
+ * This method will allow trusted subclasses of ObjectInputStream to
+ * substitute one object for another during deserialization. Replacing
+ * objects is disabled until enableResolveObject is called. The
+ * enableResolveObject method checks that the stream requesting to resolve
+ * object can be trusted. Every reference to serializable objects is passed
+ * to resolveObject. To insure that the private state of objects is not
+ * unintentionally exposed only trusted streams may use resolveObject.
+ *
+ * checkPermission method with the
+ * SerializablePermission("enableSubstitution") permission to
+ * ensure it's ok to enable the stream to allow objects read from the
+ * stream to be replaced.
+ *
+ * @param enable true for enabling use of resolveObject for
+ * every object being deserialized
+ * @return the previous setting before this method was invoked
+ * @throws SecurityException if a security manager exists and its
+ * checkPermission method denies enabling the stream
+ * to allow objects read from the stream to be replaced.
+ * @see SecurityManager#checkPermission
+ * @see java.io.SerializablePermission
+ */
+ protected boolean enableResolveObject(boolean enable)
+ throws SecurityException
+ {
+ throw new SecurityException();
+ }
+
+ /**
+ * The readStreamHeader method is provided to allow subclasses to read and
+ * verify their own stream headers. It reads and verifies the magic number
+ * and version number.
+ *
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws StreamCorruptedException if control information in the stream
+ * is inconsistent
+ */
+ protected void readStreamHeader()
+ throws IOException, StreamCorruptedException
+ {
+ short s0 = bin.readShort();
+ short s1 = bin.readShort();
+ if (s0 != STREAM_MAGIC || s1 != STREAM_VERSION) {
+ throw new StreamCorruptedException(
+ String.format("invalid stream header: %04X%04X", s0, s1));
+ }
+ }
+
+ /**
+ * Read a class descriptor from the serialization stream. This method is
+ * called when the ObjectInputStream expects a class descriptor as the next
+ * item in the serialization stream. Subclasses of ObjectInputStream may
+ * override this method to read in class descriptors that have been written
+ * in non-standard formats (by subclasses of ObjectOutputStream which have
+ * overridden the writeClassDescriptor method). By default,
+ * this method reads class descriptors according to the format defined in
+ * the Object Serialization specification.
+ *
+ * @return the class descriptor read
+ * @throws IOException If an I/O error has occurred.
+ * @throws ClassNotFoundException If the Class of a serialized object used
+ * in the class descriptor representation cannot be found
+ * @see java.io.ObjectOutputStream#writeClassDescriptor(java.io.ObjectStreamClass)
+ * @since 1.3
+ */
+ protected ObjectStreamClass readClassDescriptor()
+ throws IOException, ClassNotFoundException
+ {
+ ObjectStreamClass desc = new ObjectStreamClass();
+ desc.readNonProxy(this);
+ return desc;
+ }
+
+ /**
+ * Reads a byte of data. This method will block if no input is available.
+ *
+ * @return the byte read, or -1 if the end of the stream is reached.
+ * @throws IOException If an I/O error has occurred.
+ */
+ public int read() throws IOException {
+ return bin.read();
+ }
+
+ /**
+ * Reads into an array of bytes. This method will block until some input
+ * is available. Consider using java.io.DataInputStream.readFully to read
+ * exactly 'length' bytes.
+ *
+ * @param buf the buffer into which the data is read
+ * @param off the start offset of the data
+ * @param len the maximum number of bytes read
+ * @return the actual number of bytes read, -1 is returned when the end of
+ * the stream is reached.
+ * @throws IOException If an I/O error has occurred.
+ * @see java.io.DataInputStream#readFully(byte[],int,int)
+ */
+ public int read(byte[] buf, int off, int len) throws IOException {
+ if (buf == null) {
+ throw new NullPointerException();
+ }
+ int endoff = off + len;
+ if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) {
+ throw new IndexOutOfBoundsException();
+ }
+ return bin.read(buf, off, len, false);
+ }
+
+ /**
+ * Returns the number of bytes that can be read without blocking.
+ *
+ * @return the number of available bytes.
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ */
+ public int available() throws IOException {
+ return bin.available();
+ }
+
+ /**
+ * Closes the input stream. Must be called to release any resources
+ * associated with the stream.
+ *
+ * @throws IOException If an I/O error has occurred.
+ */
+ public void close() throws IOException {
+ /*
+ * Even if stream already closed, propagate redundant close to
+ * underlying stream to stay consistent with previous implementations.
+ */
+ closed = true;
+ if (depth == 0) {
+ clear();
+ }
+ bin.close();
+ }
+
+ /**
+ * Reads in a boolean.
+ *
+ * @return the boolean read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public boolean readBoolean() throws IOException {
+ return bin.readBoolean();
+ }
+
+ /**
+ * Reads an 8 bit byte.
+ *
+ * @return the 8 bit byte read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public byte readByte() throws IOException {
+ return bin.readByte();
+ }
+
+ /**
+ * Reads an unsigned 8 bit byte.
+ *
+ * @return the 8 bit byte read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public int readUnsignedByte() throws IOException {
+ return bin.readUnsignedByte();
+ }
+
+ /**
+ * Reads a 16 bit char.
+ *
+ * @return the 16 bit char read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public char readChar() throws IOException {
+ return bin.readChar();
+ }
+
+ /**
+ * Reads a 16 bit short.
+ *
+ * @return the 16 bit short read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public short readShort() throws IOException {
+ return bin.readShort();
+ }
+
+ /**
+ * Reads an unsigned 16 bit short.
+ *
+ * @return the 16 bit short read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public int readUnsignedShort() throws IOException {
+ return bin.readUnsignedShort();
+ }
+
+ /**
+ * Reads a 32 bit int.
+ *
+ * @return the 32 bit integer read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public int readInt() throws IOException {
+ return bin.readInt();
+ }
+
+ /**
+ * Reads a 64 bit long.
+ *
+ * @return the read 64 bit long.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public long readLong() throws IOException {
+ return bin.readLong();
+ }
+
+ /**
+ * Reads a 32 bit float.
+ *
+ * @return the 32 bit float read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public float readFloat() throws IOException {
+ return bin.readFloat();
+ }
+
+ /**
+ * Reads a 64 bit double.
+ *
+ * @return the 64 bit double read.
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public double readDouble() throws IOException {
+ return bin.readDouble();
+ }
+
+ /**
+ * Reads bytes, blocking until all bytes are read.
+ *
+ * @param buf the buffer into which the data is read
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public void readFully(byte[] buf) throws IOException {
+ bin.readFully(buf, 0, buf.length, false);
+ }
+
+ /**
+ * Reads bytes, blocking until all bytes are read.
+ *
+ * @param buf the buffer into which the data is read
+ * @param off the start offset of the data
+ * @param len the maximum number of bytes to read
+ * @throws EOFException If end of file is reached.
+ * @throws IOException If other I/O error has occurred.
+ */
+ public void readFully(byte[] buf, int off, int len) throws IOException {
+ int endoff = off + len;
+ if (off < 0 || len < 0 || endoff > buf.length || endoff < 0) {
+ throw new IndexOutOfBoundsException();
+ }
+ bin.readFully(buf, off, len, false);
+ }
+
+ /**
+ * Skips bytes.
+ *
+ * @param len the number of bytes to be skipped
+ * @return the actual number of bytes skipped.
+ * @throws IOException If an I/O error has occurred.
+ */
+ public int skipBytes(int len) throws IOException {
+ return bin.skipBytes(len);
+ }
+
+ /**
+ * Reads in a line that has been terminated by a \n, \r, \r\n or EOF.
+ *
+ * @return a String copy of the line.
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @deprecated This method does not properly convert bytes to characters.
+ * see DataInputStream for the details and alternatives.
+ */
+ @Deprecated
+ public String readLine() throws IOException {
+ return bin.readLine();
+ }
+
+ /**
+ * Reads a String in
+ * modified UTF-8
+ * format.
+ *
+ * @return the String.
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws UTFDataFormatException if read bytes do not represent a valid
+ * modified UTF-8 encoding of a string
+ */
+ public String readUTF() throws IOException {
+ return bin.readUTF();
+ }
+
+ /**
+ * Provide access to the persistent fields read from the input stream.
+ */
+ public static abstract class GetField {
+
+ /**
+ * Get the ObjectStreamClass that describes the fields in the stream.
+ *
+ * @return the descriptor class that describes the serializable fields
+ */
+ public abstract ObjectStreamClass getObjectStreamClass();
+
+ /**
+ * Return true if the named field is defaulted and has no value in this
+ * stream.
+ *
+ * @param name the name of the field
+ * @return true, if and only if the named field is defaulted
+ * @throws IOException if there are I/O errors while reading from
+ * the underlying InputStream
+ * @throws IllegalArgumentException if name does not
+ * correspond to a serializable field
+ */
+ public abstract boolean defaulted(String name) throws IOException;
+
+ /**
+ * Get the value of the named boolean field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named boolean field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract boolean get(String name, boolean val)
+ throws IOException;
+
+ /**
+ * Get the value of the named byte field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named byte field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract byte get(String name, byte val) throws IOException;
+
+ /**
+ * Get the value of the named char field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named char field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract char get(String name, char val) throws IOException;
+
+ /**
+ * Get the value of the named short field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named short field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract short get(String name, short val) throws IOException;
+
+ /**
+ * Get the value of the named int field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named int field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract int get(String name, int val) throws IOException;
+
+ /**
+ * Get the value of the named long field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named long field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract long get(String name, long val) throws IOException;
+
+ /**
+ * Get the value of the named float field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named float field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract float get(String name, float val) throws IOException;
+
+ /**
+ * Get the value of the named double field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named double field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract double get(String name, double val) throws IOException;
+
+ /**
+ * Get the value of the named Object field from the persistent field.
+ *
+ * @param name the name of the field
+ * @param val the default value to use if name does not
+ * have a value
+ * @return the value of the named Object field
+ * @throws IOException if there are I/O errors while reading from the
+ * underlying InputStream
+ * @throws IllegalArgumentException if type of name is
+ * not serializable or if the field type is incorrect
+ */
+ public abstract Object get(String name, Object val) throws IOException;
+ }
+
+ /**
+ * Verifies that this (possibly subclass) instance can be constructed
+ * without violating security constraints: the subclass must not override
+ * security-sensitive non-final methods, or else the
+ * "enableSubclassImplementation" SerializablePermission is checked.
+ */
+ private void verifySubclass() {
+ Class cl = getClass();
+ if (cl == ObjectInputStream.class) {
+ return;
+ }
+ throw new SecurityException();
+ }
+
+ /**
+ * Clears internal data structures.
+ */
+ private void clear() {
+ handles.clear();
+ vlist.clear();
+ }
+
+ /**
+ * Underlying readObject implementation.
+ */
+ private Object readObject0(boolean unshared) throws IOException {
+ boolean oldMode = bin.getBlockDataMode();
+ if (oldMode) {
+ int remain = bin.currentBlockRemaining();
+ if (remain > 0) {
+ throw new OptionalDataException(remain);
+ } else if (defaultDataEnd) {
+ /*
+ * Fix for 4360508: stream is currently at the end of a field
+ * value block written via default serialization; since there
+ * is no terminating TC_ENDBLOCKDATA tag, simulate
+ * end-of-custom-data behavior explicitly.
+ */
+ throw new OptionalDataException(true);
+ }
+ bin.setBlockDataMode(false);
+ }
+
+ byte tc;
+ while ((tc = bin.peekByte()) == TC_RESET) {
+ bin.readByte();
+ handleReset();
+ }
+
+ depth++;
+ try {
+ switch (tc) {
+ case TC_NULL:
+ return readNull();
+
+ case TC_REFERENCE:
+ return readHandle(unshared);
+
+ case TC_CLASS:
+ return readClass(unshared);
+
+ case TC_CLASSDESC:
+ case TC_PROXYCLASSDESC:
+ return readClassDesc(unshared);
+
+ case TC_STRING:
+ case TC_LONGSTRING:
+ return checkResolve(readString(unshared));
+
+ case TC_ARRAY:
+ return checkResolve(readArray(unshared));
+
+ case TC_ENUM:
+ return checkResolve(readEnum(unshared));
+
+ case TC_OBJECT:
+ return checkResolve(readOrdinaryObject(unshared));
+
+ case TC_EXCEPTION:
+ IOException ex = readFatalException();
+ throw new WriteAbortedException("writing aborted", ex);
+
+ case TC_BLOCKDATA:
+ case TC_BLOCKDATALONG:
+ if (oldMode) {
+ bin.setBlockDataMode(true);
+ bin.peek(); // force header read
+ throw new OptionalDataException(
+ bin.currentBlockRemaining());
+ } else {
+ throw new StreamCorruptedException(
+ "unexpected block data");
+ }
+
+ case TC_ENDBLOCKDATA:
+ if (oldMode) {
+ throw new OptionalDataException(true);
+ } else {
+ throw new StreamCorruptedException(
+ "unexpected end of block data");
+ }
+
+ default:
+ throw new StreamCorruptedException(
+ String.format("invalid type code: %02X", tc));
+ }
+ } finally {
+ depth--;
+ bin.setBlockDataMode(oldMode);
+ }
+ }
+
+ /**
+ * If resolveObject has been enabled and given object does not have an
+ * exception associated with it, calls resolveObject to determine
+ * replacement for object, and updates handle table accordingly. Returns
+ * replacement object, or echoes provided object if no replacement
+ * occurred. Expects that passHandle is set to given object's handle prior
+ * to calling this method.
+ */
+ private Object checkResolve(Object obj) throws IOException {
+ if (!enableResolve || handles.lookupException(passHandle) != null) {
+ return obj;
+ }
+ Object rep = resolveObject(obj);
+ if (rep != obj) {
+ handles.setObject(passHandle, rep);
+ }
+ return rep;
+ }
+
+ /**
+ * Reads string without allowing it to be replaced in stream. Called from
+ * within ObjectStreamClass.read().
+ */
+ String readTypeString() throws IOException {
+ int oldHandle = passHandle;
+ try {
+ byte tc = bin.peekByte();
+ switch (tc) {
+ case TC_NULL:
+ return (String) readNull();
+
+ case TC_REFERENCE:
+ return (String) readHandle(false);
+
+ case TC_STRING:
+ case TC_LONGSTRING:
+ return readString(false);
+
+ default:
+ throw new StreamCorruptedException(
+ String.format("invalid type code: %02X", tc));
+ }
+ } finally {
+ passHandle = oldHandle;
+ }
+ }
+
+ /**
+ * Reads in null code, sets passHandle to NULL_HANDLE and returns null.
+ */
+ private Object readNull() throws IOException {
+ if (bin.readByte() != TC_NULL) {
+ throw new InternalError();
+ }
+ passHandle = NULL_HANDLE;
+ return null;
+ }
+
+ /**
+ * Reads in object handle, sets passHandle to the read handle, and returns
+ * object associated with the handle.
+ */
+ private Object readHandle(boolean unshared) throws IOException {
+ if (bin.readByte() != TC_REFERENCE) {
+ throw new InternalError();
+ }
+ passHandle = bin.readInt() - baseWireHandle;
+ if (passHandle < 0 || passHandle >= handles.size()) {
+ throw new StreamCorruptedException(
+ String.format("invalid handle value: %08X", passHandle +
+ baseWireHandle));
+ }
+ if (unshared) {
+ // REMIND: what type of exception to throw here?
+ throw new InvalidObjectException(
+ "cannot read back reference as unshared");
+ }
+
+ Object obj = handles.lookupObject(passHandle);
+ if (obj == unsharedMarker) {
+ // REMIND: what type of exception to throw here?
+ throw new InvalidObjectException(
+ "cannot read back reference to unshared object");
+ }
+ return obj;
+ }
+
+ /**
+ * Reads in and returns class object. Sets passHandle to class object's
+ * assigned handle. Returns null if class is unresolvable (in which case a
+ * ClassNotFoundException will be associated with the class' handle in the
+ * handle table).
+ */
+ private Class readClass(boolean unshared) throws IOException {
+ if (bin.readByte() != TC_CLASS) {
+ throw new InternalError();
+ }
+ ObjectStreamClass desc = readClassDesc(false);
+ Class cl = desc.forClass();
+ passHandle = handles.assign(unshared ? unsharedMarker : cl);
+
+ ClassNotFoundException resolveEx = desc.getResolveException();
+ if (resolveEx != null) {
+ handles.markException(passHandle, resolveEx);
+ }
+
+ handles.finish(passHandle);
+ return cl;
+ }
+
+ /**
+ * Reads in and returns (possibly null) class descriptor. Sets passHandle
+ * to class descriptor's assigned handle. If class descriptor cannot be
+ * resolved to a class in the local VM, a ClassNotFoundException is
+ * associated with the class descriptor's handle.
+ */
+ private ObjectStreamClass readClassDesc(boolean unshared)
+ throws IOException
+ {
+ byte tc = bin.peekByte();
+ switch (tc) {
+ case TC_NULL:
+ return (ObjectStreamClass) readNull();
+
+ case TC_REFERENCE:
+ return (ObjectStreamClass) readHandle(unshared);
+
+ case TC_PROXYCLASSDESC:
+ return readProxyDesc(unshared);
+
+ case TC_CLASSDESC:
+ return readNonProxyDesc(unshared);
+
+ default:
+ throw new StreamCorruptedException(
+ String.format("invalid type code: %02X", tc));
+ }
+ }
+
+ /**
+ * Reads in and returns class descriptor for a dynamic proxy class. Sets
+ * passHandle to proxy class descriptor's assigned handle. If proxy class
+ * descriptor cannot be resolved to a class in the local VM, a
+ * ClassNotFoundException is associated with the descriptor's handle.
+ */
+ private ObjectStreamClass readProxyDesc(boolean unshared)
+ throws IOException
+ {
+ if (bin.readByte() != TC_PROXYCLASSDESC) {
+ throw new InternalError();
+ }
+
+ ObjectStreamClass desc = new ObjectStreamClass();
+ int descHandle = handles.assign(unshared ? unsharedMarker : desc);
+ passHandle = NULL_HANDLE;
+
+ int numIfaces = bin.readInt();
+ String[] ifaces = new String[numIfaces];
+ for (int i = 0; i < numIfaces; i++) {
+ ifaces[i] = bin.readUTF();
+ }
+
+ Class cl = null;
+ ClassNotFoundException resolveEx = null;
+ bin.setBlockDataMode(true);
+ try {
+ if ((cl = resolveProxyClass(ifaces)) == null) {
+ resolveEx = new ClassNotFoundException("null class");
+ }
+ } catch (ClassNotFoundException ex) {
+ resolveEx = ex;
+ }
+ skipCustomData();
+
+ desc.initProxy(cl, resolveEx, readClassDesc(false));
+
+ handles.finish(descHandle);
+ passHandle = descHandle;
+ return desc;
+ }
+
+ /**
+ * Reads in and returns class descriptor for a class that is not a dynamic
+ * proxy class. Sets passHandle to class descriptor's assigned handle. If
+ * class descriptor cannot be resolved to a class in the local VM, a
+ * ClassNotFoundException is associated with the descriptor's handle.
+ */
+ private ObjectStreamClass readNonProxyDesc(boolean unshared)
+ throws IOException
+ {
+ if (bin.readByte() != TC_CLASSDESC) {
+ throw new InternalError();
+ }
+
+ ObjectStreamClass desc = new ObjectStreamClass();
+ int descHandle = handles.assign(unshared ? unsharedMarker : desc);
+ passHandle = NULL_HANDLE;
+
+ ObjectStreamClass readDesc = null;
+ try {
+ readDesc = readClassDescriptor();
+ } catch (ClassNotFoundException ex) {
+ throw (IOException) new InvalidClassException(
+ "failed to read class descriptor").initCause(ex);
+ }
+
+ Class cl = null;
+ ClassNotFoundException resolveEx = null;
+ bin.setBlockDataMode(true);
+ try {
+ if ((cl = resolveClass(readDesc)) == null) {
+ resolveEx = new ClassNotFoundException("null class");
+ }
+ } catch (ClassNotFoundException ex) {
+ resolveEx = ex;
+ }
+ skipCustomData();
+
+ desc.initNonProxy(readDesc, cl, resolveEx, readClassDesc(false));
+
+ handles.finish(descHandle);
+ passHandle = descHandle;
+ return desc;
+ }
+
+ /**
+ * Reads in and returns new string. Sets passHandle to new string's
+ * assigned handle.
+ */
+ private String readString(boolean unshared) throws IOException {
+ String str;
+ byte tc = bin.readByte();
+ switch (tc) {
+ case TC_STRING:
+ str = bin.readUTF();
+ break;
+
+ case TC_LONGSTRING:
+ str = bin.readLongUTF();
+ break;
+
+ default:
+ throw new StreamCorruptedException(
+ String.format("invalid type code: %02X", tc));
+ }
+ passHandle = handles.assign(unshared ? unsharedMarker : str);
+ handles.finish(passHandle);
+ return str;
+ }
+
+ /**
+ * Reads in and returns array object, or null if array class is
+ * unresolvable. Sets passHandle to array's assigned handle.
+ */
+ private Object readArray(boolean unshared) throws IOException {
+ if (bin.readByte() != TC_ARRAY) {
+ throw new InternalError();
+ }
+
+ ObjectStreamClass desc = readClassDesc(false);
+ int len = bin.readInt();
+
+ Object array = null;
+ Class cl, ccl = null;
+ if ((cl = desc.forClass()) != null) {
+ ccl = cl.getComponentType();
+ array = Array.newInstance(ccl, len);
+ }
+
+ int arrayHandle = handles.assign(unshared ? unsharedMarker : array);
+ ClassNotFoundException resolveEx = desc.getResolveException();
+ if (resolveEx != null) {
+ handles.markException(arrayHandle, resolveEx);
+ }
+
+ if (ccl == null) {
+ for (int i = 0; i < len; i++) {
+ readObject0(false);
+ }
+ } else if (ccl.isPrimitive()) {
+ if (ccl == Integer.TYPE) {
+ bin.readInts((int[]) array, 0, len);
+ } else if (ccl == Byte.TYPE) {
+ bin.readFully((byte[]) array, 0, len, true);
+ } else if (ccl == Long.TYPE) {
+ bin.readLongs((long[]) array, 0, len);
+ } else if (ccl == Float.TYPE) {
+ bin.readFloats((float[]) array, 0, len);
+ } else if (ccl == Double.TYPE) {
+ bin.readDoubles((double[]) array, 0, len);
+ } else if (ccl == Short.TYPE) {
+ bin.readShorts((short[]) array, 0, len);
+ } else if (ccl == Character.TYPE) {
+ bin.readChars((char[]) array, 0, len);
+ } else if (ccl == Boolean.TYPE) {
+ bin.readBooleans((boolean[]) array, 0, len);
+ } else {
+ throw new InternalError();
+ }
+ } else {
+ Object[] oa = (Object[]) array;
+ for (int i = 0; i < len; i++) {
+ oa[i] = readObject0(false);
+ handles.markDependency(arrayHandle, passHandle);
+ }
+ }
+
+ handles.finish(arrayHandle);
+ passHandle = arrayHandle;
+ return array;
+ }
+
+ /**
+ * Reads in and returns enum constant, or null if enum type is
+ * unresolvable. Sets passHandle to enum constant's assigned handle.
+ */
+ private Enum readEnum(boolean unshared) throws IOException {
+ if (bin.readByte() != TC_ENUM) {
+ throw new InternalError();
+ }
+
+ ObjectStreamClass desc = readClassDesc(false);
+ if (!desc.isEnum()) {
+ throw new InvalidClassException("non-enum class: " + desc);
+ }
+
+ int enumHandle = handles.assign(unshared ? unsharedMarker : null);
+ ClassNotFoundException resolveEx = desc.getResolveException();
+ if (resolveEx != null) {
+ handles.markException(enumHandle, resolveEx);
+ }
+
+ String name = readString(false);
+ Enum en = null;
+ Class cl = desc.forClass();
+ if (cl != null) {
+ try {
+ en = Enum.valueOf(cl, name);
+ } catch (IllegalArgumentException ex) {
+ throw (IOException) new InvalidObjectException(
+ "enum constant " + name + " does not exist in " +
+ cl).initCause(ex);
+ }
+ if (!unshared) {
+ handles.setObject(enumHandle, en);
+ }
+ }
+
+ handles.finish(enumHandle);
+ passHandle = enumHandle;
+ return en;
+ }
+
+ /**
+ * Reads and returns "ordinary" (i.e., not a String, Class,
+ * ObjectStreamClass, array, or enum constant) object, or null if object's
+ * class is unresolvable (in which case a ClassNotFoundException will be
+ * associated with object's handle). Sets passHandle to object's assigned
+ * handle.
+ */
+ private Object readOrdinaryObject(boolean unshared)
+ throws IOException
+ {
+ if (bin.readByte() != TC_OBJECT) {
+ throw new InternalError();
+ }
+
+ ObjectStreamClass desc = readClassDesc(false);
+ desc.checkDeserialize();
+
+ Object obj;
+ try {
+ obj = desc.isInstantiable() ? desc.newInstance() : null;
+ } catch (Exception ex) {
+ throw (IOException) new InvalidClassException(
+ desc.forClass().getName(),
+ "unable to create instance").initCause(ex);
+ }
+
+ passHandle = handles.assign(unshared ? unsharedMarker : obj);
+ ClassNotFoundException resolveEx = desc.getResolveException();
+ if (resolveEx != null) {
+ handles.markException(passHandle, resolveEx);
+ }
+
+ if (desc.isExternalizable()) {
+ readExternalData((Externalizable) obj, desc);
+ } else {
+ readSerialData(obj, desc);
+ }
+
+ handles.finish(passHandle);
+
+ if (obj != null &&
+ handles.lookupException(passHandle) == null &&
+ desc.hasReadResolveMethod())
+ {
+ Object rep = desc.invokeReadResolve(obj);
+ if (unshared && rep.getClass().isArray()) {
+ rep = cloneArray(rep);
+ }
+ if (rep != obj) {
+ handles.setObject(passHandle, obj = rep);
+ }
+ }
+
+ return obj;
+ }
+
+ /**
+ * If obj is non-null, reads externalizable data by invoking readExternal()
+ * method of obj; otherwise, attempts to skip over externalizable data.
+ * Expects that passHandle is set to obj's handle before this method is
+ * called.
+ */
+ private void readExternalData(Externalizable obj, ObjectStreamClass desc)
+ throws IOException
+ {
+ Object oldContext = curContext;
+ curContext = null;
+ try {
+ boolean blocked = desc.hasBlockExternalData();
+ if (blocked) {
+ bin.setBlockDataMode(true);
+ }
+ if (obj != null) {
+ try {
+ obj.readExternal(this);
+ } catch (ClassNotFoundException ex) {
+ /*
+ * In most cases, the handle table has already propagated
+ * a CNFException to passHandle at this point; this mark
+ * call is included to address cases where the readExternal
+ * method has cons'ed and thrown a new CNFException of its
+ * own.
+ */
+ handles.markException(passHandle, ex);
+ }
+ }
+ if (blocked) {
+ skipCustomData();
+ }
+ } finally {
+ curContext = oldContext;
+ }
+ /*
+ * At this point, if the externalizable data was not written in
+ * block-data form and either the externalizable class doesn't exist
+ * locally (i.e., obj == null) or readExternal() just threw a
+ * CNFException, then the stream is probably in an inconsistent state,
+ * since some (or all) of the externalizable data may not have been
+ * consumed. Since there's no "correct" action to take in this case,
+ * we mimic the behavior of past serialization implementations and
+ * blindly hope that the stream is in sync; if it isn't and additional
+ * externalizable data remains in the stream, a subsequent read will
+ * most likely throw a StreamCorruptedException.
+ */
+ }
+
+ /**
+ * Reads (or attempts to skip, if obj is null or is tagged with a
+ * ClassNotFoundException) instance data for each serializable class of
+ * object in stream, from superclass to subclass. Expects that passHandle
+ * is set to obj's handle before this method is called.
+ */
+ private void readSerialData(Object obj, ObjectStreamClass desc)
+ throws IOException
+ {
+ ObjectStreamClass.ClassDataSlot[] slots = desc.getClassDataLayout();
+ for (int i = 0; i < slots.length; i++) {
+ ObjectStreamClass slotDesc = slots[i].desc;
+
+ if (slots[i].hasData) {
+ if (obj != null &&
+ slotDesc.hasReadObjectMethod() &&
+ handles.lookupException(passHandle) == null)
+ {
+ Object oldContext = curContext;
+
+ try {
+ curContext = null; //new SerialCallbackContext(obj, slotDesc);
+
+ bin.setBlockDataMode(true);
+ slotDesc.invokeReadObject(obj, this);
+ } catch (ClassNotFoundException ex) {
+ /*
+ * In most cases, the handle table has already
+ * propagated a CNFException to passHandle at this
+ * point; this mark call is included to address cases
+ * where the custom readObject method has cons'ed and
+ * thrown a new CNFException of its own.
+ */
+ handles.markException(passHandle, ex);
+ } finally {
+ //curContext.setUsed();
+ curContext = oldContext;
+ }
+
+ /*
+ * defaultDataEnd may have been set indirectly by custom
+ * readObject() method when calling defaultReadObject() or
+ * readFields(); clear it to restore normal read behavior.
+ */
+ defaultDataEnd = false;
+ } else {
+ defaultReadFields(obj, slotDesc);
+ }
+ if (slotDesc.hasWriteObjectData()) {
+ skipCustomData();
+ } else {
+ bin.setBlockDataMode(false);
+ }
+ } else {
+ if (obj != null &&
+ slotDesc.hasReadObjectNoDataMethod() &&
+ handles.lookupException(passHandle) == null)
+ {
+ slotDesc.invokeReadObjectNoData(obj);
+ }
+ }
+ }
+ }
+
+ /**
+ * Skips over all block data and objects until TC_ENDBLOCKDATA is
+ * encountered.
+ */
+ private void skipCustomData() throws IOException {
+ int oldHandle = passHandle;
+ for (;;) {
+ if (bin.getBlockDataMode()) {
+ bin.skipBlockData();
+ bin.setBlockDataMode(false);
+ }
+ switch (bin.peekByte()) {
+ case TC_BLOCKDATA:
+ case TC_BLOCKDATALONG:
+ bin.setBlockDataMode(true);
+ break;
+
+ case TC_ENDBLOCKDATA:
+ bin.readByte();
+ passHandle = oldHandle;
+ return;
+
+ default:
+ readObject0(false);
+ break;
+ }
+ }
+ }
+
+ /**
+ * Reads in values of serializable fields declared by given class
+ * descriptor. If obj is non-null, sets field values in obj. Expects that
+ * passHandle is set to obj's handle before this method is called.
+ */
+ private void defaultReadFields(Object obj, ObjectStreamClass desc)
+ throws IOException
+ {
+ // REMIND: is isInstance check necessary?
+ Class cl = desc.forClass();
+ if (cl != null && obj != null && !cl.isInstance(obj)) {
+ throw new ClassCastException();
+ }
+
+ int primDataSize = desc.getPrimDataSize();
+ if (primVals == null || primVals.length < primDataSize) {
+ primVals = new byte[primDataSize];
+ }
+ bin.readFully(primVals, 0, primDataSize, false);
+ if (obj != null) {
+ desc.setPrimFieldValues(obj, primVals);
+ }
+
+ int objHandle = passHandle;
+ ObjectStreamField[] fields = desc.getFields(false);
+ Object[] objVals = new Object[desc.getNumObjFields()];
+ int numPrimFields = fields.length - objVals.length;
+ for (int i = 0; i < objVals.length; i++) {
+ ObjectStreamField f = fields[numPrimFields + i];
+ objVals[i] = readObject0(f.isUnshared());
+ if (f.getField() != null) {
+ handles.markDependency(objHandle, passHandle);
+ }
+ }
+ if (obj != null) {
+ desc.setObjFieldValues(obj, objVals);
+ }
+ passHandle = objHandle;
+ }
+
+ /**
+ * Reads in and returns IOException that caused serialization to abort.
+ * All stream state is discarded prior to reading in fatal exception. Sets
+ * passHandle to fatal exception's handle.
+ */
+ private IOException readFatalException() throws IOException {
+ if (bin.readByte() != TC_EXCEPTION) {
+ throw new InternalError();
+ }
+ clear();
+ return (IOException) readObject0(false);
+ }
+
+ /**
+ * If recursion depth is 0, clears internal data structures; otherwise,
+ * throws a StreamCorruptedException. This method is called when a
+ * TC_RESET typecode is encountered.
+ */
+ private void handleReset() throws StreamCorruptedException {
+ if (depth > 0) {
+ throw new StreamCorruptedException(
+ "unexpected reset; recursion depth: " + depth);
+ }
+ clear();
+ }
+
+ /**
+ * Converts specified span of bytes into float values.
+ */
+ // REMIND: remove once hotspot inlines Float.intBitsToFloat
+ private static native void bytesToFloats(byte[] src, int srcpos,
+ float[] dst, int dstpos,
+ int nfloats);
+
+ /**
+ * Converts specified span of bytes into double values.
+ */
+ // REMIND: remove once hotspot inlines Double.longBitsToDouble
+ private static native void bytesToDoubles(byte[] src, int srcpos,
+ double[] dst, int dstpos,
+ int ndoubles);
+
+ /**
+ * Returns the first non-null class loader (not counting class loaders of
+ * generated reflection implementation classes) up the execution stack, or
+ * null if only code from the null class loader is on the stack. This
+ * method is also called via reflection by the following RMI-IIOP class:
+ *
+ * com.sun.corba.se.internal.util.JDKClassLoader
+ *
+ * This method should not be removed or its signature changed without
+ * corresponding modifications to the above class.
+ */
+ // REMIND: change name to something more accurate?
+ private static native ClassLoader latestUserDefinedLoader();
+
+ /**
+ * Default GetField implementation.
+ */
+ private class GetFieldImpl extends GetField {
+
+ /** class descriptor describing serializable fields */
+ private final ObjectStreamClass desc;
+ /** primitive field values */
+ private final byte[] primVals;
+ /** object field values */
+ private final Object[] objVals;
+ /** object field value handles */
+ private final int[] objHandles;
+
+ /**
+ * Creates GetFieldImpl object for reading fields defined in given
+ * class descriptor.
+ */
+ GetFieldImpl(ObjectStreamClass desc) {
+ this.desc = desc;
+ primVals = new byte[desc.getPrimDataSize()];
+ objVals = new Object[desc.getNumObjFields()];
+ objHandles = new int[objVals.length];
+ }
+
+ public ObjectStreamClass getObjectStreamClass() {
+ return desc;
+ }
+
+ public boolean defaulted(String name) throws IOException {
+ return (getFieldOffset(name, null) < 0);
+ }
+
+ public boolean get(String name, boolean val) throws IOException {
+ int off = getFieldOffset(name, Boolean.TYPE);
+ return (off >= 0) ? Bits.getBoolean(primVals, off) : val;
+ }
+
+ public byte get(String name, byte val) throws IOException {
+ int off = getFieldOffset(name, Byte.TYPE);
+ return (off >= 0) ? primVals[off] : val;
+ }
+
+ public char get(String name, char val) throws IOException {
+ int off = getFieldOffset(name, Character.TYPE);
+ return (off >= 0) ? Bits.getChar(primVals, off) : val;
+ }
+
+ public short get(String name, short val) throws IOException {
+ int off = getFieldOffset(name, Short.TYPE);
+ return (off >= 0) ? Bits.getShort(primVals, off) : val;
+ }
+
+ public int get(String name, int val) throws IOException {
+ int off = getFieldOffset(name, Integer.TYPE);
+ return (off >= 0) ? Bits.getInt(primVals, off) : val;
+ }
+
+ public float get(String name, float val) throws IOException {
+ int off = getFieldOffset(name, Float.TYPE);
+ return (off >= 0) ? Bits.getFloat(primVals, off) : val;
+ }
+
+ public long get(String name, long val) throws IOException {
+ int off = getFieldOffset(name, Long.TYPE);
+ return (off >= 0) ? Bits.getLong(primVals, off) : val;
+ }
+
+ public double get(String name, double val) throws IOException {
+ int off = getFieldOffset(name, Double.TYPE);
+ return (off >= 0) ? Bits.getDouble(primVals, off) : val;
+ }
+
+ public Object get(String name, Object val) throws IOException {
+ int off = getFieldOffset(name, Object.class);
+ if (off >= 0) {
+ int objHandle = objHandles[off];
+ handles.markDependency(passHandle, objHandle);
+ return (handles.lookupException(objHandle) == null) ?
+ objVals[off] : null;
+ } else {
+ return val;
+ }
+ }
+
+ /**
+ * Reads primitive and object field values from stream.
+ */
+ void readFields() throws IOException {
+ bin.readFully(primVals, 0, primVals.length, false);
+
+ int oldHandle = passHandle;
+ ObjectStreamField[] fields = desc.getFields(false);
+ int numPrimFields = fields.length - objVals.length;
+ for (int i = 0; i < objVals.length; i++) {
+ objVals[i] =
+ readObject0(fields[numPrimFields + i].isUnshared());
+ objHandles[i] = passHandle;
+ }
+ passHandle = oldHandle;
+ }
+
+ /**
+ * Returns offset of field with given name and type. A specified type
+ * of null matches all types, Object.class matches all non-primitive
+ * types, and any other non-null type matches assignable types only.
+ * If no matching field is found in the (incoming) class
+ * descriptor but a matching field is present in the associated local
+ * class descriptor, returns -1. Throws IllegalArgumentException if
+ * neither incoming nor local class descriptor contains a match.
+ */
+ private int getFieldOffset(String name, Class type) {
+ ObjectStreamField field = desc.getField(name, type);
+ if (field != null) {
+ return field.getOffset();
+ } else if (desc.getLocalDesc().getField(name, type) != null) {
+ return -1;
+ } else {
+ throw new IllegalArgumentException("no such field " + name +
+ " with type " + type);
+ }
+ }
+ }
+
+ /**
+ * Prioritized list of callbacks to be performed once object graph has been
+ * completely deserialized.
+ */
+ private static class ValidationList {
+
+
+ /**
+ * Creates new (empty) ValidationList.
+ */
+ ValidationList() {
+ }
+
+ /**
+ * Registers callback. Throws InvalidObjectException if callback
+ * object is null.
+ */
+ void register(ObjectInputValidation obj, int priority)
+ throws InvalidObjectException
+ {
+ if (obj == null) {
+ throw new InvalidObjectException("null callback");
+ }
+ throw new InvalidObjectException("Does not work.");
+ }
+
+ /**
+ * Invokes all registered callbacks and clears the callback list.
+ * Callbacks with higher priorities are called first; those with equal
+ * priorities may be called in any order. If any of the callbacks
+ * throws an InvalidObjectException, the callback process is terminated
+ * and the exception propagated upwards.
+ */
+ void doCallbacks() throws InvalidObjectException {
+ }
+
+ /**
+ * Resets the callback list to its initial (empty) state.
+ */
+ public void clear() {
+ }
+ }
+
+ /**
+ * Input stream supporting single-byte peek operations.
+ */
+ private static class PeekInputStream extends InputStream {
+
+ /** underlying stream */
+ private final InputStream in;
+ /** peeked byte */
+ private int peekb = -1;
+
+ /**
+ * Creates new PeekInputStream on top of given underlying stream.
+ */
+ PeekInputStream(InputStream in) {
+ this.in = in;
+ }
+
+ /**
+ * Peeks at next byte value in stream. Similar to read(), except
+ * that it does not consume the read value.
+ */
+ int peek() throws IOException {
+ return (peekb >= 0) ? peekb : (peekb = in.read());
+ }
+
+ public int read() throws IOException {
+ if (peekb >= 0) {
+ int v = peekb;
+ peekb = -1;
+ return v;
+ } else {
+ return in.read();
+ }
+ }
+
+ public int read(byte[] b, int off, int len) throws IOException {
+ if (len == 0) {
+ return 0;
+ } else if (peekb < 0) {
+ return in.read(b, off, len);
+ } else {
+ b[off++] = (byte) peekb;
+ len--;
+ peekb = -1;
+ int n = in.read(b, off, len);
+ return (n >= 0) ? (n + 1) : 1;
+ }
+ }
+
+ void readFully(byte[] b, int off, int len) throws IOException {
+ int n = 0;
+ while (n < len) {
+ int count = read(b, off + n, len - n);
+ if (count < 0) {
+ throw new EOFException();
+ }
+ n += count;
+ }
+ }
+
+ public long skip(long n) throws IOException {
+ if (n <= 0) {
+ return 0;
+ }
+ int skipped = 0;
+ if (peekb >= 0) {
+ peekb = -1;
+ skipped++;
+ n--;
+ }
+ return skipped + skip(n);
+ }
+
+ public int available() throws IOException {
+ return in.available() + ((peekb >= 0) ? 1 : 0);
+ }
+
+ public void close() throws IOException {
+ in.close();
+ }
+ }
+
+ /**
+ * Input stream with two modes: in default mode, inputs data written in the
+ * same format as DataOutputStream; in "block data" mode, inputs data
+ * bracketed by block data markers (see object serialization specification
+ * for details). Buffering depends on block data mode: when in default
+ * mode, no data is buffered in advance; when in block data mode, all data
+ * for the current data block is read in at once (and buffered).
+ */
+ private class BlockDataInputStream
+ extends InputStream implements DataInput
+ {
+ /** maximum data block length */
+ private static final int MAX_BLOCK_SIZE = 1024;
+ /** maximum data block header length */
+ private static final int MAX_HEADER_SIZE = 5;
+ /** (tunable) length of char buffer (for reading strings) */
+ private static final int CHAR_BUF_SIZE = 256;
+ /** readBlockHeader() return value indicating header read may block */
+ private static final int HEADER_BLOCKED = -2;
+
+ /** buffer for reading general/block data */
+ private final byte[] buf = new byte[MAX_BLOCK_SIZE];
+ /** buffer for reading block data headers */
+ private final byte[] hbuf = new byte[MAX_HEADER_SIZE];
+ /** char buffer for fast string reads */
+ private final char[] cbuf = new char[CHAR_BUF_SIZE];
+
+ /** block data mode */
+ private boolean blkmode = false;
+
+ // block data state fields; values meaningful only when blkmode true
+ /** current offset into buf */
+ private int pos = 0;
+ /** end offset of valid data in buf, or -1 if no more block data */
+ private int end = -1;
+ /** number of bytes in current block yet to be read from stream */
+ private int unread = 0;
+
+ /** underlying stream (wrapped in peekable filter stream) */
+ private final PeekInputStream in;
+ /** loopback stream (for data reads that span data blocks) */
+ private final DataInputStream din;
+
+ /**
+ * Creates new BlockDataInputStream on top of given underlying stream.
+ * Block data mode is turned off by default.
+ */
+ BlockDataInputStream(InputStream in) {
+ this.in = new PeekInputStream(in);
+ din = new DataInputStream(this);
+ }
+
+ /**
+ * Sets block data mode to the given mode (true == on, false == off)
+ * and returns the previous mode value. If the new mode is the same as
+ * the old mode, no action is taken. Throws IllegalStateException if
+ * block data mode is being switched from on to off while unconsumed
+ * block data is still present in the stream.
+ */
+ boolean setBlockDataMode(boolean newmode) throws IOException {
+ if (blkmode == newmode) {
+ return blkmode;
+ }
+ if (newmode) {
+ pos = 0;
+ end = 0;
+ unread = 0;
+ } else if (pos < end) {
+ throw new IllegalStateException("unread block data");
+ }
+ blkmode = newmode;
+ return !blkmode;
+ }
+
+ /**
+ * Returns true if the stream is currently in block data mode, false
+ * otherwise.
+ */
+ boolean getBlockDataMode() {
+ return blkmode;
+ }
+
+ /**
+ * If in block data mode, skips to the end of the current group of data
+ * blocks (but does not unset block data mode). If not in block data
+ * mode, throws an IllegalStateException.
+ */
+ void skipBlockData() throws IOException {
+ if (!blkmode) {
+ throw new IllegalStateException("not in block data mode");
+ }
+ while (end >= 0) {
+ refill();
+ }
+ }
+
+ /**
+ * Attempts to read in the next block data header (if any). If
+ * canBlock is false and a full header cannot be read without possibly
+ * blocking, returns HEADER_BLOCKED, else if the next element in the
+ * stream is a block data header, returns the block data length
+ * specified by the header, else returns -1.
+ */
+ private int readBlockHeader(boolean canBlock) throws IOException {
+ if (defaultDataEnd) {
+ /*
+ * Fix for 4360508: stream is currently at the end of a field
+ * value block written via default serialization; since there
+ * is no terminating TC_ENDBLOCKDATA tag, simulate
+ * end-of-custom-data behavior explicitly.
+ */
+ return -1;
+ }
+ try {
+ for (;;) {
+ int avail = canBlock ? Integer.MAX_VALUE : in.available();
+ if (avail == 0) {
+ return HEADER_BLOCKED;
+ }
+
+ int tc = in.peek();
+ switch (tc) {
+ case TC_BLOCKDATA:
+ if (avail < 2) {
+ return HEADER_BLOCKED;
+ }
+ in.readFully(hbuf, 0, 2);
+ return hbuf[1] & 0xFF;
+
+ case TC_BLOCKDATALONG:
+ if (avail < 5) {
+ return HEADER_BLOCKED;
+ }
+ in.readFully(hbuf, 0, 5);
+ int len = Bits.getInt(hbuf, 1);
+ if (len < 0) {
+ throw new StreamCorruptedException(
+ "illegal block data header length: " +
+ len);
+ }
+ return len;
+
+ /*
+ * TC_RESETs may occur in between data blocks.
+ * Unfortunately, this case must be parsed at a lower
+ * level than other typecodes, since primitive data
+ * reads may span data blocks separated by a TC_RESET.
+ */
+ case TC_RESET:
+ in.read();
+ handleReset();
+ break;
+
+ default:
+ if (tc >= 0 && (tc < TC_BASE || tc > TC_MAX)) {
+ throw new StreamCorruptedException(
+ String.format("invalid type code: %02X",
+ tc));
+ }
+ return -1;
+ }
+ }
+ } catch (EOFException ex) {
+ throw new StreamCorruptedException(
+ "unexpected EOF while reading block data header");
+ }
+ }
+
+ /**
+ * Refills internal buffer buf with block data. Any data in buf at the
+ * time of the call is considered consumed. Sets the pos, end, and
+ * unread fields to reflect the new amount of available block data; if
+ * the next element in the stream is not a data block, sets pos and
+ * unread to 0 and end to -1.
+ */
+ private void refill() throws IOException {
+ try {
+ do {
+ pos = 0;
+ if (unread > 0) {
+ int n =
+ in.read(buf, 0, Math.min(unread, MAX_BLOCK_SIZE));
+ if (n >= 0) {
+ end = n;
+ unread -= n;
+ } else {
+ throw new StreamCorruptedException(
+ "unexpected EOF in middle of data block");
+ }
+ } else {
+ int n = readBlockHeader(true);
+ if (n >= 0) {
+ end = 0;
+ unread = n;
+ } else {
+ end = -1;
+ unread = 0;
+ }
+ }
+ } while (pos == end);
+ } catch (IOException ex) {
+ pos = 0;
+ end = -1;
+ unread = 0;
+ throw ex;
+ }
+ }
+
+ /**
+ * If in block data mode, returns the number of unconsumed bytes
+ * remaining in the current data block. If not in block data mode,
+ * throws an IllegalStateException.
+ */
+ int currentBlockRemaining() {
+ if (blkmode) {
+ return (end >= 0) ? (end - pos) + unread : 0;
+ } else {
+ throw new IllegalStateException();
+ }
+ }
+
+ /**
+ * Peeks at (but does not consume) and returns the next byte value in
+ * the stream, or -1 if the end of the stream/block data (if in block
+ * data mode) has been reached.
+ */
+ int peek() throws IOException {
+ if (blkmode) {
+ if (pos == end) {
+ refill();
+ }
+ return (end >= 0) ? (buf[pos] & 0xFF) : -1;
+ } else {
+ return in.peek();
+ }
+ }
+
+ /**
+ * Peeks at (but does not consume) and returns the next byte value in
+ * the stream, or throws EOFException if end of stream/block data has
+ * been reached.
+ */
+ byte peekByte() throws IOException {
+ int val = peek();
+ if (val < 0) {
+ throw new EOFException();
+ }
+ return (byte) val;
+ }
+
+
+ /* ----------------- generic input stream methods ------------------ */
+ /*
+ * The following methods are equivalent to their counterparts in
+ * InputStream, except that they interpret data block boundaries and
+ * read the requested data from within data blocks when in block data
+ * mode.
+ */
+
+ public int read() throws IOException {
+ if (blkmode) {
+ if (pos == end) {
+ refill();
+ }
+ return (end >= 0) ? (buf[pos++] & 0xFF) : -1;
+ } else {
+ return in.read();
+ }
+ }
+
+ public int read(byte[] b, int off, int len) throws IOException {
+ return read(b, off, len, false);
+ }
+
+ public long skip(long len) throws IOException {
+ long remain = len;
+ while (remain > 0) {
+ if (blkmode) {
+ if (pos == end) {
+ refill();
+ }
+ if (end < 0) {
+ break;
+ }
+ int nread = (int) Math.min(remain, end - pos);
+ remain -= nread;
+ pos += nread;
+ } else {
+ int nread = (int) Math.min(remain, MAX_BLOCK_SIZE);
+ if ((nread = in.read(buf, 0, nread)) < 0) {
+ break;
+ }
+ remain -= nread;
+ }
+ }
+ return len - remain;
+ }
+
+ public int available() throws IOException {
+ if (blkmode) {
+ if ((pos == end) && (unread == 0)) {
+ int n;
+ while ((n = readBlockHeader(false)) == 0) ;
+ switch (n) {
+ case HEADER_BLOCKED:
+ break;
+
+ case -1:
+ pos = 0;
+ end = -1;
+ break;
+
+ default:
+ pos = 0;
+ end = 0;
+ unread = n;
+ break;
+ }
+ }
+ // avoid unnecessary call to in.available() if possible
+ int unreadAvail = (unread > 0) ?
+ Math.min(in.available(), unread) : 0;
+ return (end >= 0) ? (end - pos) + unreadAvail : 0;
+ } else {
+ return in.available();
+ }
+ }
+
+ public void close() throws IOException {
+ if (blkmode) {
+ pos = 0;
+ end = -1;
+ unread = 0;
+ }
+ in.close();
+ }
+
+ /**
+ * Attempts to read len bytes into byte array b at offset off. Returns
+ * the number of bytes read, or -1 if the end of stream/block data has
+ * been reached. If copy is true, reads values into an intermediate
+ * buffer before copying them to b (to avoid exposing a reference to
+ * b).
+ */
+ int read(byte[] b, int off, int len, boolean copy) throws IOException {
+ if (len == 0) {
+ return 0;
+ } else if (blkmode) {
+ if (pos == end) {
+ refill();
+ }
+ if (end < 0) {
+ return -1;
+ }
+ int nread = Math.min(len, end - pos);
+ System.arraycopy(buf, pos, b, off, nread);
+ pos += nread;
+ return nread;
+ } else if (copy) {
+ int nread = in.read(buf, 0, Math.min(len, MAX_BLOCK_SIZE));
+ if (nread > 0) {
+ System.arraycopy(buf, 0, b, off, nread);
+ }
+ return nread;
+ } else {
+ return in.read(b, off, len);
+ }
+ }
+
+ /* ----------------- primitive data input methods ------------------ */
+ /*
+ * The following methods are equivalent to their counterparts in
+ * DataInputStream, except that they interpret data block boundaries
+ * and read the requested data from within data blocks when in block
+ * data mode.
+ */
+
+ public void readFully(byte[] b) throws IOException {
+ readFully(b, 0, b.length, false);
+ }
+
+ public void readFully(byte[] b, int off, int len) throws IOException {
+ readFully(b, off, len, false);
+ }
+
+ public void readFully(byte[] b, int off, int len, boolean copy)
+ throws IOException
+ {
+ while (len > 0) {
+ int n = read(b, off, len, copy);
+ if (n < 0) {
+ throw new EOFException();
+ }
+ off += n;
+ len -= n;
+ }
+ }
+
+ public int skipBytes(int n) throws IOException {
+ return din.skipBytes(n);
+ }
+
+ public boolean readBoolean() throws IOException {
+ int v = read();
+ if (v < 0) {
+ throw new EOFException();
+ }
+ return (v != 0);
+ }
+
+ public byte readByte() throws IOException {
+ int v = read();
+ if (v < 0) {
+ throw new EOFException();
+ }
+ return (byte) v;
+ }
+
+ public int readUnsignedByte() throws IOException {
+ int v = read();
+ if (v < 0) {
+ throw new EOFException();
+ }
+ return v;
+ }
+
+ public char readChar() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 2);
+ } else if (end - pos < 2) {
+ return din.readChar();
+ }
+ char v = Bits.getChar(buf, pos);
+ pos += 2;
+ return v;
+ }
+
+ public short readShort() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 2);
+ } else if (end - pos < 2) {
+ return din.readShort();
+ }
+ short v = Bits.getShort(buf, pos);
+ pos += 2;
+ return v;
+ }
+
+ public int readUnsignedShort() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 2);
+ } else if (end - pos < 2) {
+ return din.readUnsignedShort();
+ }
+ int v = Bits.getShort(buf, pos) & 0xFFFF;
+ pos += 2;
+ return v;
+ }
+
+ public int readInt() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 4);
+ } else if (end - pos < 4) {
+ return din.readInt();
+ }
+ int v = Bits.getInt(buf, pos);
+ pos += 4;
+ return v;
+ }
+
+ public float readFloat() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 4);
+ } else if (end - pos < 4) {
+ return din.readFloat();
+ }
+ float v = Bits.getFloat(buf, pos);
+ pos += 4;
+ return v;
+ }
+
+ public long readLong() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 8);
+ } else if (end - pos < 8) {
+ return din.readLong();
+ }
+ long v = Bits.getLong(buf, pos);
+ pos += 8;
+ return v;
+ }
+
+ public double readDouble() throws IOException {
+ if (!blkmode) {
+ pos = 0;
+ in.readFully(buf, 0, 8);
+ } else if (end - pos < 8) {
+ return din.readDouble();
+ }
+ double v = Bits.getDouble(buf, pos);
+ pos += 8;
+ return v;
+ }
+
+ public String readUTF() throws IOException {
+ return readUTFBody(readUnsignedShort());
+ }
+
+ public String readLine() throws IOException {
+ return din.readLine(); // deprecated, not worth optimizing
+ }
+
+ /* -------------- primitive data array input methods --------------- */
+ /*
+ * The following methods read in spans of primitive data values.
+ * Though equivalent to calling the corresponding primitive read
+ * methods repeatedly, these methods are optimized for reading groups
+ * of primitive data values more efficiently.
+ */
+
+ void readBooleans(boolean[] v, int off, int len) throws IOException {
+ int stop, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ int span = Math.min(endoff - off, MAX_BLOCK_SIZE);
+ in.readFully(buf, 0, span);
+ stop = off + span;
+ pos = 0;
+ } else if (end - pos < 1) {
+ v[off++] = din.readBoolean();
+ continue;
+ } else {
+ stop = Math.min(endoff, off + end - pos);
+ }
+
+ while (off < stop) {
+ v[off++] = Bits.getBoolean(buf, pos++);
+ }
+ }
+ }
+
+ void readChars(char[] v, int off, int len) throws IOException {
+ int stop, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 1);
+ in.readFully(buf, 0, span << 1);
+ stop = off + span;
+ pos = 0;
+ } else if (end - pos < 2) {
+ v[off++] = din.readChar();
+ continue;
+ } else {
+ stop = Math.min(endoff, off + ((end - pos) >> 1));
+ }
+
+ while (off < stop) {
+ v[off++] = Bits.getChar(buf, pos);
+ pos += 2;
+ }
+ }
+ }
+
+ void readShorts(short[] v, int off, int len) throws IOException {
+ int stop, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 1);
+ in.readFully(buf, 0, span << 1);
+ stop = off + span;
+ pos = 0;
+ } else if (end - pos < 2) {
+ v[off++] = din.readShort();
+ continue;
+ } else {
+ stop = Math.min(endoff, off + ((end - pos) >> 1));
+ }
+
+ while (off < stop) {
+ v[off++] = Bits.getShort(buf, pos);
+ pos += 2;
+ }
+ }
+ }
+
+ void readInts(int[] v, int off, int len) throws IOException {
+ int stop, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 2);
+ in.readFully(buf, 0, span << 2);
+ stop = off + span;
+ pos = 0;
+ } else if (end - pos < 4) {
+ v[off++] = din.readInt();
+ continue;
+ } else {
+ stop = Math.min(endoff, off + ((end - pos) >> 2));
+ }
+
+ while (off < stop) {
+ v[off++] = Bits.getInt(buf, pos);
+ pos += 4;
+ }
+ }
+ }
+
+ void readFloats(float[] v, int off, int len) throws IOException {
+ int span, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 2);
+ in.readFully(buf, 0, span << 2);
+ pos = 0;
+ } else if (end - pos < 4) {
+ v[off++] = din.readFloat();
+ continue;
+ } else {
+ span = Math.min(endoff - off, ((end - pos) >> 2));
+ }
+
+ bytesToFloats(buf, pos, v, off, span);
+ off += span;
+ pos += span << 2;
+ }
+ }
+
+ void readLongs(long[] v, int off, int len) throws IOException {
+ int stop, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ int span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 3);
+ in.readFully(buf, 0, span << 3);
+ stop = off + span;
+ pos = 0;
+ } else if (end - pos < 8) {
+ v[off++] = din.readLong();
+ continue;
+ } else {
+ stop = Math.min(endoff, off + ((end - pos) >> 3));
+ }
+
+ while (off < stop) {
+ v[off++] = Bits.getLong(buf, pos);
+ pos += 8;
+ }
+ }
+ }
+
+ void readDoubles(double[] v, int off, int len) throws IOException {
+ int span, endoff = off + len;
+ while (off < endoff) {
+ if (!blkmode) {
+ span = Math.min(endoff - off, MAX_BLOCK_SIZE >> 3);
+ in.readFully(buf, 0, span << 3);
+ pos = 0;
+ } else if (end - pos < 8) {
+ v[off++] = din.readDouble();
+ continue;
+ } else {
+ span = Math.min(endoff - off, ((end - pos) >> 3));
+ }
+
+ bytesToDoubles(buf, pos, v, off, span);
+ off += span;
+ pos += span << 3;
+ }
+ }
+
+ /**
+ * Reads in string written in "long" UTF format. "Long" UTF format is
+ * identical to standard UTF, except that it uses an 8 byte header
+ * (instead of the standard 2 bytes) to convey the UTF encoding length.
+ */
+ String readLongUTF() throws IOException {
+ return readUTFBody(readLong());
+ }
+
+ /**
+ * Reads in the "body" (i.e., the UTF representation minus the 2-byte
+ * or 8-byte length header) of a UTF encoding, which occupies the next
+ * utflen bytes.
+ */
+ private String readUTFBody(long utflen) throws IOException {
+ StringBuilder sbuf = new StringBuilder();
+ if (!blkmode) {
+ end = pos = 0;
+ }
+
+ while (utflen > 0) {
+ int avail = end - pos;
+ if (avail >= 3 || (long) avail == utflen) {
+ utflen -= readUTFSpan(sbuf, utflen);
+ } else {
+ if (blkmode) {
+ // near block boundary, read one byte at a time
+ utflen -= readUTFChar(sbuf, utflen);
+ } else {
+ // shift and refill buffer manually
+ if (avail > 0) {
+ System.arraycopy(buf, pos, buf, 0, avail);
+ }
+ pos = 0;
+ end = (int) Math.min(MAX_BLOCK_SIZE, utflen);
+ in.readFully(buf, avail, end - avail);
+ }
+ }
+ }
+
+ return sbuf.toString();
+ }
+
+ /**
+ * Reads span of UTF-encoded characters out of internal buffer
+ * (starting at offset pos and ending at or before offset end),
+ * consuming no more than utflen bytes. Appends read characters to
+ * sbuf. Returns the number of bytes consumed.
+ */
+ private long readUTFSpan(StringBuilder sbuf, long utflen)
+ throws IOException
+ {
+ int cpos = 0;
+ int start = pos;
+ int avail = Math.min(end - pos, CHAR_BUF_SIZE);
+ // stop short of last char unless all of utf bytes in buffer
+ int stop = pos + ((utflen > avail) ? avail - 2 : (int) utflen);
+ boolean outOfBounds = false;
+
+ try {
+ while (pos < stop) {
+ int b1, b2, b3;
+ b1 = buf[pos++] & 0xFF;
+ switch (b1 >> 4) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7: // 1 byte format: 0xxxxxxx
+ cbuf[cpos++] = (char) b1;
+ break;
+
+ case 12:
+ case 13: // 2 byte format: 110xxxxx 10xxxxxx
+ b2 = buf[pos++];
+ if ((b2 & 0xC0) != 0x80) {
+ throw new UTFDataFormatException();
+ }
+ cbuf[cpos++] = (char) (((b1 & 0x1F) << 6) |
+ ((b2 & 0x3F) << 0));
+ break;
+
+ case 14: // 3 byte format: 1110xxxx 10xxxxxx 10xxxxxx
+ b3 = buf[pos + 1];
+ b2 = buf[pos + 0];
+ pos += 2;
+ if ((b2 & 0xC0) != 0x80 || (b3 & 0xC0) != 0x80) {
+ throw new UTFDataFormatException();
+ }
+ cbuf[cpos++] = (char) (((b1 & 0x0F) << 12) |
+ ((b2 & 0x3F) << 6) |
+ ((b3 & 0x3F) << 0));
+ break;
+
+ default: // 10xx xxxx, 1111 xxxx
+ throw new UTFDataFormatException();
+ }
+ }
+ } catch (ArrayIndexOutOfBoundsException ex) {
+ outOfBounds = true;
+ } finally {
+ if (outOfBounds || (pos - start) > utflen) {
+ /*
+ * Fix for 4450867: if a malformed utf char causes the
+ * conversion loop to scan past the expected end of the utf
+ * string, only consume the expected number of utf bytes.
+ */
+ pos = start + (int) utflen;
+ throw new UTFDataFormatException();
+ }
+ }
+
+ sbuf.append(cbuf, 0, cpos);
+ return pos - start;
+ }
+
+ /**
+ * Reads in single UTF-encoded character one byte at a time, appends
+ * the character to sbuf, and returns the number of bytes consumed.
+ * This method is used when reading in UTF strings written in block
+ * data mode to handle UTF-encoded characters which (potentially)
+ * straddle block-data boundaries.
+ */
+ private int readUTFChar(StringBuilder sbuf, long utflen)
+ throws IOException
+ {
+ int b1, b2, b3;
+ b1 = readByte() & 0xFF;
+ switch (b1 >> 4) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7: // 1 byte format: 0xxxxxxx
+ sbuf.append((char) b1);
+ return 1;
+
+ case 12:
+ case 13: // 2 byte format: 110xxxxx 10xxxxxx
+ if (utflen < 2) {
+ throw new UTFDataFormatException();
+ }
+ b2 = readByte();
+ if ((b2 & 0xC0) != 0x80) {
+ throw new UTFDataFormatException();
+ }
+ sbuf.append((char) (((b1 & 0x1F) << 6) |
+ ((b2 & 0x3F) << 0)));
+ return 2;
+
+ case 14: // 3 byte format: 1110xxxx 10xxxxxx 10xxxxxx
+ if (utflen < 3) {
+ if (utflen == 2) {
+ readByte(); // consume remaining byte
+ }
+ throw new UTFDataFormatException();
+ }
+ b2 = readByte();
+ b3 = readByte();
+ if ((b2 & 0xC0) != 0x80 || (b3 & 0xC0) != 0x80) {
+ throw new UTFDataFormatException();
+ }
+ sbuf.append((char) (((b1 & 0x0F) << 12) |
+ ((b2 & 0x3F) << 6) |
+ ((b3 & 0x3F) << 0)));
+ return 3;
+
+ default: // 10xx xxxx, 1111 xxxx
+ throw new UTFDataFormatException();
+ }
+ }
+ }
+
+ /**
+ * Unsynchronized table which tracks wire handle to object mappings, as
+ * well as ClassNotFoundExceptions associated with deserialized objects.
+ * This class implements an exception-propagation algorithm for
+ * determining which objects should have ClassNotFoundExceptions associated
+ * with them, taking into account cycles and discontinuities (e.g., skipped
+ * fields) in the object graph.
+ *
+ *