am e2914615: Merge change 2099 into donut

Merge commit 'e29146158b6048936671decc060d398a68333fc0'

* commit 'e29146158b6048936671decc060d398a68333fc0':
  Hook up the backup data writer, and add a utility to read the backup data files.

core/java/android/backup/BackupDataOutput.java

@@ -22,24 +22,30 @@ import java.io.FileDescriptor;
 
 /** @hide */
 public class BackupDataOutput {
-    /* package */ FileDescriptor fd;
+    int mBackupWriter;
+    private Context mContext;
 
     public static final int OP_UPDATE = 1;
     public static final int OP_DELETE = 2;
 
     public BackupDataOutput(Context context, FileDescriptor fd) {
-        this.fd = fd;
+        mContext = context;
+        if (fd == null) throw new NullPointerException();
+        mBackupWriter = ctor(fd);
+        if (mBackupWriter == 0) {
+            throw new RuntimeException("Native initialization failed with fd=" + fd);
+        }
     }
 
-    public void close() {
-        // do we close the fd?
+    protected void finalize() throws Throwable {
+        try {
+            dtor(mBackupWriter);
+        } finally {
+            super.finalize();
+        }
     }
-    public native void flush();
-    public native void write(byte[] buffer);
-    public native void write(int oneByte);
-    public native void write(byte[] buffer, int offset, int count);
-
-    public native void writeOperation(int op);
-    public native void writeKey(String key);
+        
+    private native static int ctor(FileDescriptor fd);
+    private native static void dtor(int mBackupWriter);
 }
 

core/java/android/backup/FileBackupHelper.java

@@ -53,15 +53,12 @@ public class FileBackupHelper {
         }
         // oldStateFd can be null
         FileDescriptor oldStateFd = oldState != null ? oldState.getFileDescriptor() : null;
-        if (data.fd == null) {
-            throw new NullPointerException();
-        }
         FileDescriptor newStateFd = newState.getFileDescriptor();
         if (newStateFd == null) {
             throw new NullPointerException();
         }
 
-        int err = performBackup_native(basePath, oldStateFd, data.fd, newStateFd, files);
+        int err = performBackup_native(basePath, oldStateFd, data.mBackupWriter, newStateFd, files);
 
         if (err != 0) {
             throw new RuntimeException("Backup failed"); // TODO: more here
@@ -69,5 +66,5 @@ public class FileBackupHelper {
     }
 
     native private static int performBackup_native(String basePath, FileDescriptor oldState,
-            FileDescriptor data, FileDescriptor newState, String[] files);
+            int data, FileDescriptor newState, String[] files);
 }