private void readData(Handler handler, int length, byte flags, int streamId)
throws IOException {
// TODO: checkState open or half-closed (local) or raise STREAM_CLOSED
boolean inFinished = (flags & FLAG_END_STREAM) != 0;
boolean gzipped = (flags & FLAG_COMPRESSED) != 0;
if (gzipped) {
throw ioException("PROTOCOL_ERROR: FLAG_COMPRESSED without SETTINGS_COMPRESS_DATA");
}
short padding = (flags & FLAG_PADDED) != 0 ? (short) (source.readByte() & 0xff) : 0;
length = lengthWithoutPadding(length, flags, padding);
handler.data(inFinished, streamId, source, length);
source.skip(padding);
}
@Override
public long read(Buffer sink, long byteCount) throws IOException {
while (left == 0) {
source.skip(padding);
padding = 0;
if ((flags & FLAG_END_HEADERS) != 0) return -1;
readContinuationHeader();
// TODO: test case for empty continuation header?
}
long read = source.read(sink, Math.min(byteCount, left));
if (read == -1) return -1;
left -= read;
return read;
}
@Override
public void data(boolean inFinished, int streamId, BufferedSource source, int length)
throws IOException {
if (pushedStream(streamId)) {
pushDataLater(streamId, source, length, inFinished);
return;
}
FramedStream dataStream = getStream(streamId);
if (dataStream == null) {
writeSynResetLater(streamId, ErrorCode.INVALID_STREAM);
source.skip(length);
return;
}
dataStream.receiveData(source, length);
if (inFinished) {
dataStream.receiveFin();
}
}
@Override
public boolean onData(int streamId, BufferedSource source, int byteCount, boolean last)
throws IOException {
source.skip(byteCount);
return false;
}
@Override
public boolean nextFrame(Handler handler) throws IOException {
try {
source.require(9); // Frame header size
} catch (IOException e) {
return false; // This might be a normal socket close.
}
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Length (24) |
* +---------------+---------------+---------------+
* | Type (8) | Flags (8) |
* +-+-+-----------+---------------+-------------------------------+
* |R| Stream Identifier (31) |
* +=+=============================================================+
* | Frame Payload (0...) ...
* +---------------------------------------------------------------+
*/
int length = readMedium(source);
if (length < 0 || length > INITIAL_MAX_FRAME_SIZE) {
throw ioException("FRAME_SIZE_ERROR: %s", length);
}
byte type = (byte) (source.readByte() & 0xff);
byte flags = (byte) (source.readByte() & 0xff);
int streamId = (source.readInt() & 0x7fffffff); // Ignore reserved bit.
if (logger.isLoggable(FINE)) logger.fine(formatHeader(true, streamId, length, type, flags));
switch (type) {
case TYPE_DATA:
readData(handler, length, flags, streamId);
break;
case TYPE_HEADERS:
readHeaders(handler, length, flags, streamId);
break;
case TYPE_PRIORITY:
readPriority(handler, length, flags, streamId);
break;
case TYPE_RST_STREAM:
readRstStream(handler, length, flags, streamId);
break;
case TYPE_SETTINGS:
readSettings(handler, length, flags, streamId);
break;
case TYPE_PUSH_PROMISE:
readPushPromise(handler, length, flags, streamId);
break;
case TYPE_PING:
readPing(handler, length, flags, streamId);
break;
case TYPE_GOAWAY:
readGoAway(handler, length, flags, streamId);
break;
case TYPE_WINDOW_UPDATE:
readWindowUpdate(handler, length, flags, streamId);
break;
default:
// Implementations MUST discard frames that have unknown or unsupported types.
source.skip(length);
}
return true;
}