93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_DaemonSocketPDU_h
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#define mozilla_ipc_DaemonSocketPDU_h
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#include "mozilla/FileUtils.h"
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#include "mozilla/ipc/SocketBase.h"
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#include "mozilla/ipc/DaemonSocketMessageHandlers.h"
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namespace mozilla {
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namespace ipc {
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class DaemonSocketIOConsumer;
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/**
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* |DaemonSocketPDU| represents a single PDU that is transfered from or to
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* the HAL daemon. Each PDU contains exactly one command.
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*
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* A PDU as the following format
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*
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* | 1 | 1 | 2 | n |
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* | service | opcode | payload length | payload |
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*
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* Service and Opcode each require 1 byte, the payload length requires 2
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* bytes, and the payload requires the number of bytes as stored in the
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* payload-length field.
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*
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* Each service and opcode can have a different payload with individual
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* length. For the exact details of the HAL protocol, please refer to
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*
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* https://git.kernel.org/cgit/bluetooth/bluez.git/tree/android/hal-ipc-api.txt?id=5.24
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*
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*/
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class DaemonSocketPDU final : public UnixSocketIOBuffer
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{
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public:
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enum {
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OFF_SERVICE = 0,
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OFF_OPCODE = 1,
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OFF_LENGTH = 2,
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OFF_PAYLOAD = 4,
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HEADER_SIZE = OFF_PAYLOAD,
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MAX_PAYLOAD_LENGTH = 1 << 16
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};
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DaemonSocketPDU(uint8_t aService, uint8_t aOpcode, uint16_t aPayloadSize);
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DaemonSocketPDU(size_t aPayloadSize);
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~DaemonSocketPDU();
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void SetConsumer(DaemonSocketIOConsumer* aConsumer)
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{
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mConsumer = aConsumer;
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}
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void SetResultHandler(DaemonSocketResultHandler* aRes)
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{
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mRes = aRes;
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}
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DaemonSocketResultHandler* GetResultHandler() const
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{
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return mRes;
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}
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void GetHeader(uint8_t& aService, uint8_t& aOpcode,
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uint16_t& aPayloadSize);
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ssize_t Send(int aFd) override;
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ssize_t Receive(int aFd) override;
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int AcquireFd();
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nsresult UpdateHeader();
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private:
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size_t GetPayloadSize() const;
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void OnError(const char* aFunction, int aErrno);
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DaemonSocketIOConsumer* mConsumer;
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RefPtr<DaemonSocketResultHandler> mRes;
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ScopedClose mReceivedFd;
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};
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}
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}
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#endif
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