1 #ifndef STREAM_H 2 #define STREAM_H 3 4 #include "qom/object.h" 5 6 /* stream slave. Used until qdev provides a generic way. */ 7 #define TYPE_STREAM_SLAVE "stream-slave" 8 9 #define STREAM_SLAVE_CLASS(klass) \ 10 OBJECT_CLASS_CHECK(StreamSlaveClass, (klass), TYPE_STREAM_SLAVE) 11 #define STREAM_SLAVE_GET_CLASS(obj) \ 12 OBJECT_GET_CLASS(StreamSlaveClass, (obj), TYPE_STREAM_SLAVE) 13 #define STREAM_SLAVE(obj) \ 14 INTERFACE_CHECK(StreamSlave, (obj), TYPE_STREAM_SLAVE) 15 16 typedef struct StreamSlave StreamSlave; 17 18 typedef void (*StreamCanPushNotifyFn)(void *opaque); 19 20 typedef struct StreamSlaveClass { 21 InterfaceClass parent; 22 /** 23 * can push - determine if a stream slave is capable of accepting at least 24 * one byte of data. Returns false if cannot accept. If not implemented, the 25 * slave is assumed to always be capable of receiving. 26 * @notify: Optional callback that the slave will call when the slave is 27 * capable of receiving again. Only called if false is returned. 28 * @notify_opaque: opaque data to pass to notify call. 29 */ 30 bool (*can_push)(StreamSlave *obj, StreamCanPushNotifyFn notify, 31 void *notify_opaque); 32 /** 33 * push - push data to a Stream slave. The number of bytes pushed is 34 * returned. If the slave short returns, the master must wait before trying 35 * again, the slave may continue to just return 0 waiting for the vm time to 36 * advance. The can_push() function can be used to trap the point in time 37 * where the slave is ready to receive again, otherwise polling on a QEMU 38 * timer will work. 39 * @obj: Stream slave to push to 40 * @buf: Data to write 41 * @len: Maximum number of bytes to write 42 * @eop: End of packet flag 43 */ 44 size_t (*push)(StreamSlave *obj, unsigned char *buf, size_t len, bool eop); 45 } StreamSlaveClass; 46 47 size_t 48 stream_push(StreamSlave *sink, uint8_t *buf, size_t len, bool eop); 49 50 bool 51 stream_can_push(StreamSlave *sink, StreamCanPushNotifyFn notify, 52 void *notify_opaque); 53 54 55 #endif /* STREAM_H */ 56