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ObjectInputStream: handle TC_REFERENCE

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There are serialized objects out in the wild which make heavy use of
TC_REFERENCE: for example when an object has a reference to itself.

Therefore we need to support that, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2013-10-29 22:26:54 -05:00
parent b6d3caf458
commit ff45f452da
1 changed files with 25 additions and 3 deletions
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28
classpath/java/io/ObjectInputStream.java
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@ -36,6 +36,7 @@ import static java.io.ObjectOutputStream.getReadOrWriteMethod;
import avian.VMClass;
import java.util.ArrayList;
import java.util.HashMap;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
@ -43,7 +44,10 @@ import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class ObjectInputStream extends InputStream implements DataInput {
private final static int HANDLE_OFFSET = 0x7e0000;
private final InputStream in;
private final ArrayList references;
public ObjectInputStream(InputStream in) throws IOException {
this.in = in;
@ -56,6 +60,7 @@ public class ObjectInputStream extends InputStream implements DataInput {
if (version != STREAM_VERSION) {
throw new IOException("Unsupported version: " + version);
}
references = new ArrayList();
}
public int read() throws IOException {
@ -288,7 +293,13 @@ public class ObjectInputStream extends InputStream implements DataInput {
int length = rawShort();
byte[] bytes = new byte[length];
readFully(bytes);
return new String(bytes, "UTF-8");
String s = new String(bytes, "UTF-8");
references.add(s);
return s;
}
if (c == TC_REFERENCE) {
int handle = rawInt();
return references.get(handle - HANDLE_OFFSET);
}
if (c != TC_OBJECT) {
throw new IOException("Unexpected token: 0x"
@ -296,11 +307,21 @@ public class ObjectInputStream extends InputStream implements DataInput {
}
// class desc
expectToken(TC_CLASSDESC);
ClassDesc classDesc = classDesc();
c = rawByte();
ClassDesc classDesc;
if (c == TC_REFERENCE) {
int handle = rawInt() - HANDLE_OFFSET;
classDesc = (ClassDesc)references.get(handle);
} else if (c == TC_CLASSDESC) {
classDesc = classDesc();
} else {
throw new UnsupportedOperationException("Unexpected token: 0x"
+ Integer.toHexString(c));
}
try {
Object o = makeInstance(classDesc.clazz.vmClass);
references.add(o);
boolean customized = (classDesc.flags & SC_WRITE_METHOD) != 0;
Method readMethod = customized ?
@ -350,6 +371,7 @@ public class ObjectInputStream extends InputStream implements DataInput {
+ Long.toHexString(expected));
}
} catch (Exception ignored) { }
references.add(result);
result.flags = rawByte();
if ((result.flags & ~(SC_SERIALIZABLE | SC_WRITE_METHOD)) != 0) {