import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Properties;
public class Serialize implements Serializable {
public static final long serialVersionUID = 1l;
public int dummy = 0x12345678;
private static void expect(boolean v) {
if (! v) throw new RuntimeException();
}
private static void expectEqual(boolean a, boolean b) {
expect(a == b);
}
private static void expectEqual(int a, int b) {
expect(a == b);
}
private static void expectEqual(String a, String b) {
expect(a.equals(b));
}
private static String pad(long number, int length) {
return pad(Long.toHexString(number), length, '0');
}
private static String pad(String s, int length, char padChar) {
length -= s.length();
if (length <= 0) {
return s;
}
StringBuilder builder = new StringBuilder();
while (length-- > 0) {
builder.append(padChar);
}
return builder.append(s).toString();
}
protected static void hexdump(byte[] a) {
StringBuilder builder = new StringBuilder();
System.err.print(pad(0, 8) + " ");
for (int i = 0; i < a.length; i++) {
String hex = Integer.toHexString(a[i] & 0xff);
System.err.print(" " + (hex.length() == 1 ? "0" : "") + hex);
builder.append(a[i] < 0x20 || a[i] > 0x7f ? '.' : (char)a[i]);
if ((i & 0xf) == 0x7) {
System.err.print(" ");
} else if ((i & 0xf) == 0xf) {
System.err.println(" |" + builder + "|");
builder.setLength(0);
System.err.print(pad(i + 1, 8) + " ");
}
}
for (int i = a.length & 0xf; i < 0x10; i++) {
System.err.print(" ");
if ((i & 0xf) == 0x7) {
System.err.print(" ");
}
}
System.err.println(" |" + builder + "|");
}
private static void expectEqual(byte[] a, int[] b) {
expect(a.length == b.length);
for (int i = 0; i < a.length; ++i) {
expect(a[i] == (byte)b[i]);
}
}
private static class MyMap implements Serializable {
private transient Properties properties = new Properties();
public final static long serialVersionUID = 0x0cc1f63e2d256ae6l;
public int size() {
return properties.size();
}
public void put(String key, String value) {
properties.put(key, value);
}
public String get(String key) {
return properties.getProperty(key);
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
out.writeInt(size());
for (Object key : properties.keySet()) {
out.writeObject(key);
out.writeObject(properties.get(key));
}
}
private void readObject(ObjectInputStream in) throws IOException {
try {
in.defaultReadObject();
} catch (Exception e) {
// OpenJDK's defaultReadObject() can throw a ClassNotFoundException
throw new IOException(e);
}
properties = new Properties();
int size = in.readInt();
for (int i = 0; i < size; i++) try {
properties.put(in.readObject(), in.readObject());
} catch (ClassNotFoundException e) {
throw new IOException(e);
}
}
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectOutputStream out2 = new ObjectOutputStream(out);
out2.writeBoolean(true);
out2.flush();
out2.writeByte(17);
out2.flush();
out2.writeInt(0xcafebabe);
out2.flush();
out2.writeUTF("Max & Möritz");
out2.flush();
out2.writeChar('ɛ');
out2.flush();
out2.writeObject(new Serialize());
out2.close();
byte[] array = out.toByteArray();
expectEqual(array, new int[] {
// magic
0xac, 0xed,
// version
0x00, 0x05,
// blockdata, length
0x77, 0x1,
// true
1,
// blockdata, length
0x77, 0x1,
// (byte)17
17,
// blockdata, length
0x77, 0x4,
// 0xcafebabe
0xca, 0xfe, 0xba, 0xbe,
// blockdata, length
0x77, 0xf,
// "Max & Möritz"
0x0, 0xd, 'M', 'a', 'x', ' ', '&', ' ', 'M', 0xc3, 0xb6, 'r', 'i', 't', 'z',
// blockdata, length
0x77, 0x2,
// 'ö'
0x02, 0x5b,
// object
0x73,
// class desc, "Serialize"
0x72, 0, 9, 'S', 'e', 'r', 'i', 'a', 'l', 'i', 'z', 'e',
// serialVersionUID
0, 0, 0, 0, 0, 0, 0, 1,
// flags (SC_SERIALIZABLE)
2,
// field count
0x0, 0x1,
// int dummy
'I', 0x0, 0x5, 'd', 'u', 'm', 'm', 'y',
// class annotation
0x78,
// super class desc
0x70,
// classdata[]
0x12, 0x34, 0x56, 0x78
});
ByteArrayInputStream in = new ByteArrayInputStream(array);
ObjectInputStream in2 = new ObjectInputStream(in);
expectEqual(true, in2.readBoolean());
expectEqual(17, in2.readByte());
expectEqual(0xcafebabe, in2.readInt());
expectEqual("Max & Möritz", in2.readUTF());
expectEqual('ɛ', in2.readChar());
Serialize unserialized = (Serialize) in2.readObject();
expectEqual(0x12345678, unserialized.dummy);
in2.close();
out.reset();
out2 = new ObjectOutputStream(out);
MyMap map = new MyMap();
map.put("key", "value");
out2.writeObject(map);
out2.close();
array = out.toByteArray();
expectEqual(array, new int[] {
// magic
0xac, 0xed,
// version
0x00, 0x05,
// object
0x73,
// class desc "Serialize$MyMap"
0x72, 0, 15, 'S', 'e', 'r', 'i', 'a', 'l', 'i', 'z', 'e', '$',
'M', 'y', 'M', 'a', 'p',
// serial version UID: 0x0cc1f64e2d266ae6
0x0c, 0xc1, 0xf6, 0x3e, 0x2d, 0x25, 0x6a, 0xe6,
// flags: SC_SERIALIZABLE | SC_WRITE_METHOD
0x03,
// no (non-transient) fields
0, 0,
// class annotation
0x78,
// super class desc
0x70,
// custom TreeMap data written by TreeMap#writeObject
0x77, 4, 0x00 , 0x00, 0x00, 0x01, // (int)1 (== map.size())
0x74, 0, 3, 'k', 'e', 'y', // "key"
0x74, 0, 5, 'v', 'a', 'l', 'u', 'e', // "value"
// end block data
0x78
});
in = new ByteArrayInputStream(array);
in2 = new ObjectInputStream(in);
map = (MyMap)in2.readObject();
in2.close();
expectEqual(1, map.size());
expectEqual("value", (String)map.get("key"));
}
}