Added in API level 30

Summary: Constants | Ctors | Methods | Inherited Methods

ProtoOutputStream

---

Kotlin |Java

public final class ProtoOutputStream
extends Object

java.lang.Object
↳	android.util.proto.ProtoOutputStream

---

Class to write to a protobuf stream.

This API is not as convenient or type safe as the standard protobuf classes. If possible, the best recommended library is to use protobuf lite. However, in environments (such as the Android platform itself), a more memory efficient version is necessary.

Each write method takes an ID code from the protoc generated classes and the value to write. To make a nested object, call start(long) and then end(long) when you are done.

The ID codes have type information embedded into them, so if you call the incorrect function you will get an IllegalArgumentException.

To retrieve the encoded protobuf stream, call getBytes(). stream as the top-level objects are finished.

Summary

Constants
long	FIELD_COUNT_MASK Bit mask for selecting the field count when reading a field id that is used with a ProtoOutputStream.write(...) method.
long	FIELD_COUNT_PACKED Repeated packed field count, encoded into a field id used with a ProtoOutputStream.write(...) method.
long	FIELD_COUNT_REPEATED Repeated field count, encoded into a field id used with a ProtoOutputStream.write(...) method.
int	FIELD_COUNT_SHIFT Bit offset for building a field id to be used with a ProtoOutputStream.write(...).
long	FIELD_COUNT_SINGLE Single field count, encoded into a field id used with a ProtoOutputStream.write(...) method.
long	FIELD_COUNT_UNKNOWN Unknown field count, encoded into a field id used with a ProtoOutputStream.write(...) method.
int	FIELD_ID_SHIFT Number of bits to shift the field number to form a tag.
long	FIELD_TYPE_BOOL Field type code for bool fields.
long	FIELD_TYPE_BYTES Field type code for bytes fields.
long	FIELD_TYPE_DOUBLE Field type code for double fields.
long	FIELD_TYPE_ENUM Field type code for enum fields.
long	FIELD_TYPE_FIXED32 Field type code for fixed32 fields.
long	FIELD_TYPE_FIXED64 Field type code for fixed64 fields.
long	FIELD_TYPE_FLOAT Field type code for float fields.
long	FIELD_TYPE_INT32 Field type code for int32 fields.
long	FIELD_TYPE_INT64 Field type code for int64 fields.
long	FIELD_TYPE_MASK Mask for the field types stored in a fieldId.
long	FIELD_TYPE_MESSAGE Field type code for message fields.
long	FIELD_TYPE_SFIXED32 Field type code for sfixed32 fields.
long	FIELD_TYPE_SFIXED64 Field type code for sfixed64 fields.
int	FIELD_TYPE_SHIFT Position of the field type in a (long) fieldId.
long	FIELD_TYPE_SINT32 Field type code for sint32 fields.
long	FIELD_TYPE_SINT64 Field type code for sint64 fields.
long	FIELD_TYPE_STRING Field type code for string fields.
long	FIELD_TYPE_UINT32 Field type code for uint32 fields.
long	FIELD_TYPE_UINT64 Field type code for uint64 fields.
int	WIRE_TYPE_END_GROUP End group wire type code.
int	WIRE_TYPE_FIXED32 Fixed32 wire type code.
int	WIRE_TYPE_FIXED64 Fixed64 wire type code.
int	WIRE_TYPE_LENGTH_DELIMITED Length delimited wire type code.
int	WIRE_TYPE_MASK Mask to select the wire type from a tag.
int	WIRE_TYPE_START_GROUP Start group wire type code.
int	WIRE_TYPE_VARINT Varint wire type code.

Public constructors
ProtoOutputStream() Construct a ProtoOutputStream with the default chunk size.
ProtoOutputStream(int chunkSize) Construct a {@link ProtoOutputStream with the given chunk size.
ProtoOutputStream(OutputStream stream) Construct a ProtoOutputStream that sits on top of an OutputStream.

Public methods
static int	checkFieldId(long fieldId, long expectedFlags) Validates that the fieldId provided is of the type and count from expectedType.
void	dump(String tag) Dump debugging data about the buffers with the given log tag.
void	end(long token) End the object started by start() that returned token.
void	flush() Write remaining data to the output stream.
byte[]	getBytes() Finish the encoding of the data, and return a byte[] with the protobuf formatted data.
static String	getFieldCountString(long fieldCount) Get the developer-usable name of a field count.
static String	getFieldIdString(long fieldId) Get a debug string for a fieldId.
static String	getFieldTypeString(long fieldType) Get the developer-usable name of a field type.
int	getRawSize() Returns the total size of the data that has been written, after full protobuf encoding has occurred.
static String	getWireTypeString(int wireType) Get the developer-usable name of a wire type.
static long	makeFieldId(int id, long fieldFlags) Combine a fieldId (the field keys in the proto file) and the field flags.
static long	makeToken(int tagSize, boolean repeated, int depth, int objectId, int offset) Make a token.
long	start(long fieldId) Start a sub object.
static String	token2String(long token) Return a debugging string of a token.
void	write(long fieldId, String val) Write a string value for the given fieldId.
void	write(long fieldId, boolean val) Write a boolean value for the given fieldId.
void	write(long fieldId, int val) Write a value for the given fieldId.
void	write(long fieldId, float val) Write a value for the given fieldId.
void	write(long fieldId, long val) Write a value for the given fieldId.
void	write(long fieldId, double val) Write a value for the given fieldId.
void	write(long fieldId, byte[] val) Write a byte[] value for the given fieldId.
void	writeTag(int id, int wireType) Write an individual field tag by hand.

Inherited methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Constants

FIELD_COUNT_MASK

public static final long FIELD_COUNT_MASK

Bit mask for selecting the field count when reading a field id that is used with a ProtoOutputStream.write(...) method.

See also:

• FIELD_COUNT_SHIFT
• FIELD_COUNT_MASK
• FIELD_COUNT_UNKNOWN
• FIELD_COUNT_SINGLE
• FIELD_COUNT_REPEATED
• FIELD_COUNT_PACKED
• Protobuf Encoding

Constant Value: 16492674416640 (0x00000f0000000000)

FIELD_COUNT_PACKED

public static final long FIELD_COUNT_PACKED

Repeated packed field count, encoded into a field id used with a ProtoOutputStream.write(...) method.

See also:

• FIELD_COUNT_SHIFT
• FIELD_COUNT_MASK
• FIELD_COUNT_UNKNOWN
• FIELD_COUNT_SINGLE
• FIELD_COUNT_REPEATED
• Protobuf Encoding

Constant Value: 5497558138880 (0x0000050000000000)

FIELD_COUNT_REPEATED

public static final long FIELD_COUNT_REPEATED

Repeated field count, encoded into a field id used with a ProtoOutputStream.write(...) method.

See also:

• FIELD_COUNT_SHIFT
• FIELD_COUNT_MASK
• FIELD_COUNT_UNKNOWN
• FIELD_COUNT_SINGLE
• FIELD_COUNT_PACKED
• Protobuf Encoding

Constant Value: 2199023255552 (0x0000020000000000)

FIELD_COUNT_SHIFT

public static final int FIELD_COUNT_SHIFT

Bit offset for building a field id to be used with a ProtoOutputStream.write(...).

See also:

• FIELD_COUNT_MASK
• FIELD_COUNT_UNKNOWN
• FIELD_COUNT_SINGLE
• FIELD_COUNT_REPEATED
• FIELD_COUNT_PACKED

Constant Value: 40 (0x00000028)

FIELD_COUNT_SINGLE

public static final long FIELD_COUNT_SINGLE

Single field count, encoded into a field id used with a ProtoOutputStream.write(...) method.

See also:

• FIELD_COUNT_SHIFT
• FIELD_COUNT_MASK
• FIELD_COUNT_UNKNOWN
• FIELD_COUNT_REPEATED
• FIELD_COUNT_PACKED
• Protobuf Encoding

Constant Value: 1099511627776 (0x0000010000000000)

FIELD_COUNT_UNKNOWN

public static final long FIELD_COUNT_UNKNOWN

Unknown field count, encoded into a field id used with a ProtoOutputStream.write(...) method.

See also:

• FIELD_COUNT_SHIFT
• FIELD_COUNT_MASK
• FIELD_COUNT_SINGLE
• FIELD_COUNT_REPEATED
• FIELD_COUNT_PACKED
• Protobuf Encoding

Constant Value: 0 (0x0000000000000000)

FIELD_ID_SHIFT

public static final int FIELD_ID_SHIFT

Number of bits to shift the field number to form a tag.

 // Reading a field number from a tag.
 int fieldNumber = tag >>> FIELD_ID_SHIFT;

 // Building a tag from a field number and a wire type.
 int tag = (fieldNumber << FIELD_ID_SHIFT) | wireType;
 

See also:

• Protobuf Encoding

Constant Value: 3 (0x00000003)

FIELD_TYPE_BOOL

public static final long FIELD_TYPE_BOOL

Field type code for bool fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, boolean) method.

Constant Value: 34359738368 (0x0000000800000000)

FIELD_TYPE_BYTES

public static final long FIELD_TYPE_BYTES

Field type code for bytes fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, byte[]) method.

Constant Value: 51539607552 (0x0000000c00000000)

FIELD_TYPE_DOUBLE

public static final long FIELD_TYPE_DOUBLE

Field type code for double fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, double) method.

Constant Value: 4294967296 (0x0000000100000000)

FIELD_TYPE_ENUM

public static final long FIELD_TYPE_ENUM

Field type code for enum fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 60129542144 (0x0000000e00000000)

FIELD_TYPE_FIXED32

public static final long FIELD_TYPE_FIXED32

Field type code for fixed32 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 30064771072 (0x0000000700000000)

FIELD_TYPE_FIXED64

public static final long FIELD_TYPE_FIXED64

Field type code for fixed64 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, long) method.

Constant Value: 25769803776 (0x0000000600000000)

FIELD_TYPE_FLOAT

public static final long FIELD_TYPE_FLOAT

Field type code for float fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, float) method.

Constant Value: 8589934592 (0x0000000200000000)

FIELD_TYPE_INT32

public static final long FIELD_TYPE_INT32

Field type code for int32 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 21474836480 (0x0000000500000000)

FIELD_TYPE_INT64

public static final long FIELD_TYPE_INT64

Field type code for int64 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, long) method.

Constant Value: 12884901888 (0x0000000300000000)

FIELD_TYPE_MASK

public static final long FIELD_TYPE_MASK

Mask for the field types stored in a fieldId. Leaves a whole byte for future expansion, even though there are currently only 17 types.

Constant Value: 1095216660480 (0x000000ff00000000)

FIELD_TYPE_MESSAGE

public static final long FIELD_TYPE_MESSAGE

Field type code for message fields. Used to build constants in generated code for use with the ProtoOutputStream.start(long) method.

Constant Value: 47244640256 (0x0000000b00000000)

FIELD_TYPE_SFIXED32

public static final long FIELD_TYPE_SFIXED32

Field type code for sfixed32 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 64424509440 (0x0000000f00000000)

FIELD_TYPE_SFIXED64

public static final long FIELD_TYPE_SFIXED64

Field type code for sfixed64 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, long) method.

Constant Value: 68719476736 (0x0000001000000000)

FIELD_TYPE_SHIFT

public static final int FIELD_TYPE_SHIFT

Position of the field type in a (long) fieldId.

Constant Value: 32 (0x00000020)

FIELD_TYPE_SINT32

public static final long FIELD_TYPE_SINT32

Field type code for sint32 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 73014444032 (0x0000001100000000)

FIELD_TYPE_SINT64

public static final long FIELD_TYPE_SINT64

Field type code for sint64 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, long) method.

Constant Value: 77309411328 (0x0000001200000000)

FIELD_TYPE_STRING

public static final long FIELD_TYPE_STRING

Field type code for string fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, String) method.

Constant Value: 38654705664 (0x0000000900000000)

FIELD_TYPE_UINT32

public static final long FIELD_TYPE_UINT32

Field type code for uint32 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, int) method.

Constant Value: 55834574848 (0x0000000d00000000)

FIELD_TYPE_UINT64

public static final long FIELD_TYPE_UINT64

Field type code for uint64 fields. Used to build constants in generated code for use with the ProtoOutputStream.write(long, long) method.

Constant Value: 17179869184 (0x0000000400000000)

WIRE_TYPE_END_GROUP

public static final int WIRE_TYPE_END_GROUP

End group wire type code.

See also:

• Protobuf Encoding

Constant Value: 4 (0x00000004)

WIRE_TYPE_FIXED32

public static final int WIRE_TYPE_FIXED32

Fixed32 wire type code.

See also:

• Protobuf Encoding

Constant Value: 5 (0x00000005)

WIRE_TYPE_FIXED64

public static final int WIRE_TYPE_FIXED64

Fixed64 wire type code.

See also:

• Protobuf Encoding

Constant Value: 1 (0x00000001)

WIRE_TYPE_LENGTH_DELIMITED

public static final int WIRE_TYPE_LENGTH_DELIMITED

Length delimited wire type code.

See also:

• Protobuf Encoding

Constant Value: 2 (0x00000002)

WIRE_TYPE_MASK

public static final int WIRE_TYPE_MASK

Mask to select the wire type from a tag.

 // Reading a wire type from a tag.
 int wireType = tag & WIRE_TYPE_MASK;

 // Building a tag from a field number and a wire type.
 int tag = (fieldNumber << FIELD_ID_SHIFT) | wireType;
 

See also:

• Protobuf Encoding

Constant Value: 7 (0x00000007)

WIRE_TYPE_START_GROUP

public static final int WIRE_TYPE_START_GROUP

Start group wire type code.

See also:

• Protobuf Encoding

Constant Value: 3 (0x00000003)

WIRE_TYPE_VARINT

public static final int WIRE_TYPE_VARINT

Varint wire type code.

See also:

• Protobuf Encoding

Constant Value: 0 (0x00000000)

Public constructors

ProtoOutputStream

Added in API level 30

public ProtoOutputStream ()

Construct a ProtoOutputStream with the default chunk size.

This is for an in-memory proto. The caller should use getBytes() for the result.

ProtoOutputStream

Added in API level 30}

public ProtoOutputStream (int chunkSize)

Construct a {@link ProtoOutputStream with the given chunk size.

This is for an in-memory proto. The caller should use {@link #getBytes()} for the result.

Parameters
chunkSize	int

ProtoOutputStream

Added in API level 30

public ProtoOutputStream (OutputStream stream)

Construct a ProtoOutputStream that sits on top of an OutputStream.

The flush() method must be called when done writing to flush any remaining data, although data *may* be written at intermediate points within the writing as well.

Parameters
stream	OutputStream: This value cannot be null.

Public methods

checkFieldId

Added in API level 30

public static int checkFieldId (long fieldId, 
                long expectedFlags)

Validates that the fieldId provided is of the type and count from expectedType.

The type must match exactly to pass this check.

The count must match according to this truth table to pass the check: expectedFlags UNKNOWN SINGLE REPEATED PACKED fieldId UNKNOWN true false false false SINGLE x true false false REPEATED x false true false PACKED x false true true

Parameters
fieldId	long
expectedFlags	long

Returns
int	The raw ID of that field.

Throws
	java.lang.IllegalArgumentException IllegalArgumentException} if it is not.

dump

Added in API level 30

public void dump (String tag)

Dump debugging data about the buffers with the given log tag.

Parameters
tag	String: This value cannot be null.

end

Added in API level 30

public void end (long token)

End the object started by start() that returned token.

Parameters
token	long: The token returned from start(long)

flush

Added in API level 30

public void flush ()

Write remaining data to the output stream. If there is no output stream, this function does nothing. Any currently open objects (i.e. ones that have not had end(long) called for them will not be written). Whether this writes objects that are closed if there are remaining open objects is undefined (current implementation does not write it, future ones will). For now, can either call getBytes() or flush(), but not both.

getBytes

Added in API level 30

public byte[] getBytes ()

Finish the encoding of the data, and return a byte[] with the protobuf formatted data.

After this call, do not call any of the write* functions. The behavior is undefined.

Returns
byte[]	This value cannot be null.

getFieldCountString

Added in API level 30

public static String getFieldCountString (long fieldCount)

Get the developer-usable name of a field count.

Parameters
fieldCount	long

Returns
String	This value may be null.

getFieldIdString

Added in API level 30

public static String getFieldIdString (long fieldId)

Get a debug string for a fieldId.

Parameters
fieldId	long

Returns
String	This value cannot be null.

getFieldTypeString

Added in API level 30

public static String getFieldTypeString (long fieldType)

Get the developer-usable name of a field type.

Parameters

fieldType

long: Value is android.util.proto.ProtoStream.FIELD_TYPE_UNKNOWN, android.util.proto.ProtoStream.FIELD_TYPE_DOUBLE, android.util.proto.ProtoStream.FIELD_TYPE_FLOAT, android.util.proto.ProtoStream.FIELD_TYPE_INT64, android.util.proto.ProtoStream.FIELD_TYPE_UINT64, android.util.proto.ProtoStream.FIELD_TYPE_INT32, android.util.proto.ProtoStream.FIELD_TYPE_FIXED64, android.util.proto.ProtoStream.FIELD_TYPE_FIXED32, android.util.proto.ProtoStream.FIELD_TYPE_BOOL, android.util.proto.ProtoStream.FIELD_TYPE_STRING, android.util.proto.ProtoStream.FIELD_TYPE_MESSAGE, android.util.proto.ProtoStream.FIELD_TYPE_BYTES, android.util.proto.ProtoStream.FIELD_TYPE_UINT32, android.util.proto.ProtoStream.FIELD_TYPE_ENUM, android.util.proto.ProtoStream.FIELD_TYPE_SFIXED32, android.util.proto.ProtoStream.FIELD_TYPE_SFIXED64, android.util.proto.ProtoStream.FIELD_TYPE_SINT32, or android.util.proto.ProtoStream.FIELD_TYPE_SINT64

Returns
String	This value may be null.

getRawSize

Added in API level 30

public int getRawSize ()

Returns the total size of the data that has been written, after full protobuf encoding has occurred.

Returns
int	the uncompressed buffer size

getWireTypeString

Added in API level 30

public static String getWireTypeString (int wireType)

Get the developer-usable name of a wire type.

Parameters
wireType	int: Value is android.util.proto.ProtoStream.WIRE_TYPE_VARINT, android.util.proto.ProtoStream.WIRE_TYPE_FIXED64, android.util.proto.ProtoStream.WIRE_TYPE_LENGTH_DELIMITED, android.util.proto.ProtoStream.WIRE_TYPE_START_GROUP, android.util.proto.ProtoStream.WIRE_TYPE_END_GROUP, or android.util.proto.ProtoStream.WIRE_TYPE_FIXED32

Returns
String	This value may be null.

makeFieldId

Added in API level 30

public static long makeFieldId (int id, 
                long fieldFlags)

Combine a fieldId (the field keys in the proto file) and the field flags. Mostly useful for testing because the generated code contains the fieldId constants.

Parameters
id	int
fieldFlags	long

Returns
long

makeToken

Added in API level 30

public static long makeToken (int tagSize, 
                boolean repeated, 
                int depth, 
                int objectId, 
                int offset)

Make a token. Bits 61-63 - tag size (So we can go backwards later if the object had not data) - 3 bits, max value 7, max value needed 5 Bit 60 - true if the object is repeated (lets us require endObject or endRepeatedObject) Bits 59-51 - depth (For error checking) - 9 bits, max value 512, when checking, value is masked (if we really are more than 512 levels deep) Bits 32-50 - objectId (For error checking) - 19 bits, max value 524,288. that's a lot of objects. IDs will wrap because of the overflow, and only the tokens are compared. Bits 0-31 - offset of interest for the object.

Parameters
tagSize	int
repeated	boolean
depth	int
objectId	int
offset	int

Returns
long

start

Added in API level 30

public long start (long fieldId)

Start a sub object.

Parameters
fieldId	long: The field identifier constant from the generated class.

Returns
long	The token to call end(long) with.

token2String

Added in API level 30

public static String token2String (long token)

Return a debugging string of a token.

Parameters
token	long

Returns
String	This value cannot be null.

write

Added in API level 30

public void write (long fieldId, 
                String val)

Write a string value for the given fieldId.

If the field is not a string field, an exception will be thrown.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	String: The value. This value may be null.

write

Added in API level 30

public void write (long fieldId, 
                boolean val)

Write a boolean value for the given fieldId.

If the field is not a bool field, an IllegalStateException will be thrown.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	boolean: The value.

write

Added in API level 30

public void write (long fieldId, 
                int val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	int: The value.

write

Added in API level 30

public void write (long fieldId, 
                float val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	float: The value.

write

Added in API level 30

public void write (long fieldId, 
                long val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	long: The value.

write

Added in API level 30

public void write (long fieldId, 
                double val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	double: The value.

write

Added in API level 30

public void write (long fieldId, 
                byte[] val)

Write a byte[] value for the given fieldId.

If the field is not a bytes or object field, an exception will be thrown.

Parameters
fieldId	long: The field identifier constant from the generated class.
val	byte: The value. This value may be null.

writeTag

Added in API level 30

public void writeTag (int id, 
                int wireType)

Write an individual field tag by hand. See Protobuf Encoding for details on the structure of how tags and data are written.

Parameters
id	int
wireType	int: Value is android.util.proto.ProtoStream.WIRE_TYPE_VARINT, android.util.proto.ProtoStream.WIRE_TYPE_FIXED64, android.util.proto.ProtoStream.WIRE_TYPE_LENGTH_DELIMITED, android.util.proto.ProtoStream.WIRE_TYPE_START_GROUP, android.util.proto.ProtoStream.WIRE_TYPE_END_GROUP, or android.util.proto.ProtoStream.WIRE_TYPE_FIXED32