1 /*
2  * Copyright (C) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef OHOS_IPC_BUFFER_OBJECT_H
17 #define OHOS_IPC_BUFFER_OBJECT_H
18 
19 #include <pthread.h>
20 #include <mutex>
21 #include <string>
22 #include <cstdint>
23 #include <sys/types.h>
24 
25 #include "nocopyable.h"
26 
27 namespace OHOS {
28 constexpr int SOCKET_DEFAULT_BUFF_SIZE = 4 * 1024;
29 constexpr int SOCKET_MAX_BUFF_SIZE = 1024 * 1024;
30 constexpr int SOCKET_BUFF_RESERVED_SIZE = 256;
31 constexpr size_t MAX_RAWDATA_SIZE = 128 * 1024 * 1024; // 128M
32 
33 constexpr uint32_t SOCKET_BUFF_SIZE_USER_S = 4 * 1024;
34 constexpr uint32_t SOCKET_BUFF_SIZE_USER_M = 16 * 1024;
35 constexpr uint32_t SOCKET_BUFF_SIZE_USER_L = 64 * 1024;
36 constexpr uint32_t SOCKET_BUFF_SIZE_USER_HUGE = 1024 * 1024;
37 
38 class BufferObject {
39 public:
40     explicit BufferObject();
41 
42     ~BufferObject();
43 
44     void UpdateReceiveBuffer();
45     void UpdateSendBuffer(uint32_t userDataSize);
46     char *GetSendBufferAndLock(uint32_t size);
47     char *GetReceiveBufferAndLock(uint32_t size);
48     void ReleaseSendBufferLock();
49     void ReleaseReceiveBufferLock();
50     ssize_t GetReceiveBufferWriteCursor() const;
51     void SetReceiveBufferWriteCursor(ssize_t newWriteCursor);
52     ssize_t GetReceiveBufferReadCursor() const;
53     void SetReceiveBufferReadCursor(ssize_t newReadCursor);
54     ssize_t GetSendBufferWriteCursor() const;
55     void SetSendBufferWriteCursor(ssize_t newWriteCursor);
56     ssize_t GetSendBufferReadCursor() const;
57     void SetSendBufferReadCursor(ssize_t newReadCursor);
58     uint32_t GetNeedBufferSize(uint32_t size) const;
59     uint32_t GetSendBufferSize() const;
60     uint32_t GetRecvBufferSize() const;
61 
62 private:
63     DISALLOW_COPY_AND_MOVE(BufferObject);
64     bool ExpandSendBuffer(uint32_t size);
65     ssize_t recvBufferCursorW_ = 0;
66     ssize_t recvBufferCursorR_ = 0;
67     ssize_t sendBufferCursorW_ = 0;
68     ssize_t sendBufferCursorR_ = 0;
69     char *receiveBuffer_ = nullptr;
70     char *sendBuffer_ = nullptr;
71     std::mutex sendMutex_;
72     std::mutex recvMutex_;
73     uint32_t sendBuffSize_ = 0;
74     uint32_t recvBuffSize_ = 0;
75 };
76 } // namespace OHOS
77 #endif // OHOS_IPC_BUFFER_OBJECT_H
78