Don't WTF when reading empty data from the eventlog (d9f3d9ed) · Commits · e / os / android_frameworks_base

core/java/android/util/EventLog.java

+26 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,7 @@ public class EventLog {
		/** A previously logged event read from the logs. Instances are thread safe. */
		public static final class Event {
		private final ByteBuffer mBuffer;
		private Exception mLastWtf;

		// Layout of event log entry received from Android logger.
		// see system/core/include/log/logger.h
		@@ -116,13 +117,19 @@ public class EventLog {
		offset = V1_PAYLOAD_START;
		}
		mBuffer.limit(offset + mBuffer.getShort(LENGTH_OFFSET));
		if ((offset + DATA_OFFSET) >= mBuffer.limit()) {
		// no payload
		return null;
		}
		mBuffer.position(offset + DATA_OFFSET); // Just after the tag.
		return decodeObject();
		} catch (IllegalArgumentException e) {
		Log.wtf(TAG, "Illegal entry payload: tag=" + getTag(), e);
		mLastWtf = e;
		return null;
		} catch (BufferUnderflowException e) {
		Log.wtf(TAG, "Truncated entry payload: tag=" + getTag(), e);
		mLastWtf = e;
		return null;
		}
		}
		@@ -148,6 +155,7 @@ public class EventLog {
		return new String(mBuffer.array(), start, length, "UTF-8");
		} catch (UnsupportedEncodingException e) {
		Log.wtf(TAG, "UTF-8 is not supported", e);
		mLastWtf = e;
		return null;
		}

		@@ -173,6 +181,24 @@ public class EventLog {
		byte[] bytes = mBuffer.array();
		return Arrays.copyOf(bytes, bytes.length);
		}

		/**
		* Retreive the last WTF error generated by this object.
		* @hide
		*/
		//VisibleForTesting
		public Exception getLastError() {
		return mLastWtf;
		}

		/**
		* Clear the error state for this object.
		* @hide
		*/
		//VisibleForTesting
		public void clearError() {
		mLastWtf = null;
		}
		}

		// We assume that the native methods deal with any concurrency issues.