The code below is an Android app that packs and then unpacks a map containing a single String member ("data"). On Android 4.4.2 this member is truncated when packing if it is 512 characters or longer; 511 or fewer and it works fine.
The problem does not occur on Android 5.x or 6.x.
package my.app;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.msgpack.core.MessageFormat;
import org.msgpack.core.MessagePack;
import org.msgpack.core.MessagePacker;
import org.msgpack.core.MessageUnpacker;
public class MainActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try {
TestClass testMessage = new TestClass();
testMessage.data = testString;
byte[] encoded = writeMsgpack(testMessage);
TestClass decoded = readMsgpack(encoded);
String received = decoded.data;
if(received.equals(testString)) {
Toast.makeText(this, "Test success", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "Test fail", Toast.LENGTH_LONG).show();
Log.w(TAG, "Decoded string data: " + received);
}
} catch (Exception e) {
e.printStackTrace();
}
}
static byte[] writeMsgpack(TestClass message) {
byte[] result = null;
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
MessagePacker packer = MessagePack.newDefaultPacker(out);
message.writeMsgpack(packer);
packer.flush();
result = out.toByteArray();
} catch(IOException ioe) {
ioe.printStackTrace();
}
return result;
}
static TestClass readMsgpack(byte[] packed) {
TestClass result = null;
try {
MessageUnpacker unpacker = MessagePack.newDefaultUnpacker(packed);
result = (new TestClass()).readMsgpack(unpacker);
} catch(IOException ioe) {
ioe.printStackTrace();
}
return result;
}
static class TestClass {
public String data;
void writeMsgpack(MessagePacker packer) throws IOException {
packer.packMapHeader(1);
packer.packString("data");
packer.packString(data);
}
TestClass readMsgpack(MessageUnpacker unpacker) throws IOException {
unpacker.unpackMapHeader();
String fieldName = unpacker.unpackString();
MessageFormat fieldFormat = unpacker.getNextFormat();
if(fieldFormat.equals(MessageFormat.NIL)) {
unpacker.unpackNil();
} else if(fieldName.equals("data")) {
data = unpacker.unpackString();
}
return this;
}
}
// /* succeeds */
// private static String testString = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
/* fails */
private static String testString = "01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901";
private static final String TAG = "MainActivity";
}
The code below is an Android app that packs and then unpacks a map containing a single String member (
"data"). On Android 4.4.2 this member is truncated when packing if it is 512 characters or longer; 511 or fewer and it works fine.The problem does not occur on Android 5.x or 6.x.