Import of the watch repository from Pebble

src/fw/console/pulse2_transport_impl.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+//! Get the max send size of the link.
+size_t pulse_link_max_send_size(void);
+
+//! Begin constructing a packet to send out the PULSE2 link.
+//!
+//! \param protocol encapsulation protocol number
+void *pulse_link_send_begin(uint16_t protocol);
+
+//! Send a packet out the PULSE2 link.
+//! \param [out] buf buffer containing the packet data to send. Must be
+//!        a buffer pointer returned by \ref pulse_link_send_begin.
+//! \param length length of the packet in buf. Must not exceed the value
+//!        returned by \ref pulse_link_max_send_size.
+void pulse_link_send(void *buf, size_t length);
+
+//! Release a transmit buffer without sending the packet.
+//!
+//! \param buf buffer to be released. Must be a buffer pointer returned
+//!        by \ref pulse_link_send_begin.
+void pulse_link_send_cancel(void *buf);
+
+
+// Use preprocessor magic to generate function signatures for all protocol
+// handler functions.
+#define ON_PACKET(NUMBER, PACKET_HANDLER) \
+  void PACKET_HANDLER(void *packet, size_t length);
+#define ON_INIT(INITIALIZER) \
+  void INITIALIZER(void);
+#define ON_LINK_STATE_CHANGE(ON_UP, ON_DOWN) \
+  void ON_UP(void); \
+  void ON_DOWN(void);
+#include "console/pulse2_transport_registry.def"
+#undef ON_PACKET
+#undef ON_INIT
+#undef ON_LINK_STATE_CHANGE