1 files changed, 89 insertions, 0 deletions
diff --git a/libs/binder/RpcWireFormat.h b/libs/binder/RpcWireFormat.h
new file mode 100644
index 0000000000..c5fa008308
--- /dev/null
+++ b/libs/binder/RpcWireFormat.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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
+
+namespace android {
+
+#pragma clang diagnostic push
+#pragma clang diagnostic error "-Wpadded"
+
+enum : uint32_t {
+    /**
+     * follows is RpcWireTransaction, if flags != oneway, reply w/ RPC_COMMAND_REPLY expected
+     */
+    RPC_COMMAND_TRANSACT = 0,
+    /**
+     * follows is RpcWireReply
+     */
+    RPC_COMMAND_REPLY,
+    /**
+     * follows is RpcWireAddress
+     *
+     * note - this in the protocol directly instead of as a 'special
+     * transaction' in order to keep it as lightweight as possible (we don't
+     * want to create a 'Parcel' object for every decref)
+     */
+    RPC_COMMAND_DEC_STRONG,
+};
+
+/**
+ * These commands are used when the address in an RpcWireTransaction is zero'd
+ * out (no address). This allows the transact/reply flow to be used for
+ * additional server commands, without making the protocol for
+ * transactions/replies more complicated.
+ */
+enum : uint32_t {
+    RPC_SPECIAL_TRANSACT_GET_ROOT = 0,
+    RPC_SPECIAL_TRANSACT_GET_MAX_THREADS = 1,
+    RPC_SPECIAL_TRANSACT_GET_SESSION_ID = 2,
+};
+
+constexpr int32_t RPC_SESSION_ID_NEW = -1;
+
+// serialization is like:
+// |RpcWireHeader|struct desginated by 'command'| (over and over again)
+
+struct RpcWireHeader {
+    uint32_t command; // RPC_COMMAND_*
+    uint32_t bodySize;
+
+    uint32_t reserved[2];
+};
+
+struct RpcWireAddress {
+    uint8_t address[32];
+};
+
+struct RpcWireTransaction {
+    RpcWireAddress address;
+    uint32_t code;
+    uint32_t flags;
+
+    uint64_t asyncNumber;
+
+    uint32_t reserved[4];
+
+    uint8_t data[0];
+};
+
+struct RpcWireReply {
+    int32_t status; // transact return
+    uint8_t data[0];
+};
+
+#pragma clang diagnostic pop
+
+} // namespace android