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