private Object readDynamicGroup(int size, ByteSource in) throws IOException {
ByteBuf inbuf = (ByteBuf) in;
int expectedEndPos = inbuf.position() + size;
// PENDING: currently msgcodec only supports int32 as group id
int groupId = (int) NativeBlinkInput.readUInt64(inbuf);
inbuf.skip(4); // discard extension offset (not supported)
try {
Object group = readStaticGroup(groupId, inbuf);
int skip = expectedEndPos - inbuf.position();
if (skip < 0) {
throw new DecodeException(
"Malformed dynamic group. Read " + (-skip) + " bytes beyond group size.");
} else if (skip > 0) {
in.skip(skip);
}
return group;
} catch (Exception e) {
GroupDef groupDef = codec.getSchema().getGroup(groupId);
if (groupDef != null) {
throw new GroupDecodeException(groupDef.getName(), e);
} else {
throw e;
}
}
}
@Override
public void writeDynamicGroup(ByteSink out, Object group)
throws IOException, IllegalArgumentException {
if (out instanceof ByteBuf) {
ByteBuf buf = (ByteBuf) out;
int start = buf.position();
buf.skip(4); // size
writeStaticGroupWithId(buf, group);
int end = buf.position();
int size = end - start - 4;
buf.position(start);
buf.writeIntLE(size);
buf.position(end);
} else {
byte[] tmpBuf = codec.bufferPool().get();
try {
ByteArrayBuf tmpOut = new ByteArrayBuf(tmpBuf);
writeDynamicGroup(tmpOut, group);
tmpOut.flip();
tmpOut.copyTo(out);
} finally {
codec.bufferPool().release(tmpBuf);
}
}
}