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 #include "buffer_object.h"
17 #include "securec.h"
18 #include "sys_binder.h"
19
20 namespace OHOS {
BufferObject()21 BufferObject::BufferObject()
22 {
23 }
24
~BufferObject()25 BufferObject::~BufferObject()
26 {
27 if (receiveBuffer_ != nullptr) {
28 delete[] receiveBuffer_;
29 receiveBuffer_ = nullptr;
30 }
31 if (sendBuffer_ != nullptr) {
32 delete[] sendBuffer_;
33 sendBuffer_ = nullptr;
34 }
35 }
36
37 /* update buffer need get mutex first */
UpdateSendBuffer()38 void BufferObject::UpdateSendBuffer()
39 {
40 if (sendBufferCursorW_ <= sendBufferCursorR_) {
41 sendBufferCursorW_ = 0;
42 sendBufferCursorR_ = 0;
43 return;
44 }
45 /* check whether buffer size is enough, if not, move write/read cursor to head */
46 if (sendBuffSize_ - static_cast<uint32_t>(sendBufferCursorW_) < SOCKET_BUFF_RESERVED_SIZE) {
47 /* writeCursor always bigger than readCursor */
48 if (sendBufferCursorW_ - sendBufferCursorR_ < sendBufferCursorR_) {
49 auto memcpyResult = memmove_s(sendBuffer_, sendBufferCursorW_ - sendBufferCursorR_,
50 sendBuffer_ + sendBufferCursorR_, sendBufferCursorW_ - sendBufferCursorR_);
51 if (memcpyResult != EOK) {
52 sendBufferCursorW_ = 0; // drop data in buffer, if memmove failed
53 } else {
54 sendBufferCursorW_ = sendBufferCursorW_ - sendBufferCursorR_;
55 }
56 sendBufferCursorR_ = 0;
57 }
58 }
59 }
60
61 /* update buffer need get mutex first */
UpdateReceiveBuffer()62 void BufferObject::UpdateReceiveBuffer()
63 {
64 if (recvBufferCursorW_ <= recvBufferCursorR_) {
65 recvBufferCursorR_ = 0;
66 recvBufferCursorW_ = 0;
67 return;
68 }
69 /* check whether buffer size is enough, if not, move write/read cursor to head */
70 if (recvBuffSize_ - static_cast<uint32_t>(recvBufferCursorW_) < SOCKET_BUFF_RESERVED_SIZE) {
71 /* writeCursor always bigger than readCursor */
72 if (recvBufferCursorW_ - recvBufferCursorR_ < recvBufferCursorR_) {
73 auto memcpyResult = memmove_s(receiveBuffer_, recvBufferCursorW_ - recvBufferCursorR_,
74 receiveBuffer_ + recvBufferCursorR_, recvBufferCursorW_ - recvBufferCursorR_);
75 if (memcpyResult != EOK) {
76 recvBufferCursorW_ = 0; // drop data in buffer, if memmove failed
77 } else {
78 recvBufferCursorW_ = recvBufferCursorW_ - recvBufferCursorR_;
79 }
80 recvBufferCursorR_ = 0;
81 }
82 }
83 }
84
GetSendBufferAndLock(uint32_t size)85 char *BufferObject::GetSendBufferAndLock(uint32_t size)
86 {
87 uint32_t needSize = GetNeedBufferSize(size);
88 if (needSize == 0) {
89 return nullptr;
90 }
91 sendMutex_.lock();
92 if (needSize > sendBuffSize_) {
93 char *newBuffer_ = new (std::nothrow) char[needSize];
94 if (newBuffer_ == nullptr) {
95 sendMutex_.unlock();
96 return nullptr;
97 }
98
99 if ((sendBuffer_ != nullptr) && (sendBuffSize_ != 0)) {
100 int memcpyResult = memcpy_s(newBuffer_, needSize, sendBuffer_, sendBuffSize_);
101 if (memcpyResult != 0) {
102 delete[] newBuffer_;
103 sendMutex_.unlock();
104 return nullptr;
105 }
106 }
107
108 delete[] sendBuffer_;
109 sendBuffer_ = newBuffer_;
110 sendBuffSize_ = needSize;
111 }
112
113 /* attention: need unlock mutex by caller */
114 return sendBuffer_;
115 }
116
GetReceiveBufferAndLock(uint32_t size)117 char *BufferObject::GetReceiveBufferAndLock(uint32_t size)
118 {
119 uint32_t needSize = GetNeedBufferSize(size);
120 if (needSize == 0) {
121 return nullptr;
122 }
123 recvMutex_.lock();
124 if (needSize > recvBuffSize_) {
125 char *newBuffer_ = new (std::nothrow) char[needSize];
126 if (newBuffer_ == nullptr) {
127 recvMutex_.unlock();
128 return nullptr;
129 }
130
131 if ((receiveBuffer_ != nullptr) && (recvBuffSize_ != 0)) {
132 int memcpyResult = memcpy_s(newBuffer_, needSize, receiveBuffer_, recvBuffSize_);
133 if (memcpyResult != 0) {
134 delete[] newBuffer_;
135 recvMutex_.unlock();
136 return nullptr;
137 }
138 }
139
140 delete[] receiveBuffer_;
141 receiveBuffer_ = newBuffer_;
142 recvBuffSize_ = needSize;
143 }
144
145 /* attention: need unlock mutex by caller */
146 return receiveBuffer_;
147 }
148
ReleaseSendBufferLock()149 void BufferObject::ReleaseSendBufferLock()
150 {
151 sendMutex_.unlock();
152 }
153
ReleaseReceiveBufferLock()154 void BufferObject::ReleaseReceiveBufferLock()
155 {
156 recvMutex_.unlock();
157 }
158
GetReceiveBufferWriteCursor() const159 ssize_t BufferObject::GetReceiveBufferWriteCursor() const
160 {
161 return recvBufferCursorW_;
162 }
163
SetReceiveBufferWriteCursor(ssize_t newWriteCursor)164 void BufferObject::SetReceiveBufferWriteCursor(ssize_t newWriteCursor)
165 {
166 recvBufferCursorW_ = newWriteCursor;
167 }
168
GetReceiveBufferReadCursor() const169 ssize_t BufferObject::GetReceiveBufferReadCursor() const
170 {
171 return recvBufferCursorR_;
172 }
173
SetReceiveBufferReadCursor(ssize_t newReadCursor)174 void BufferObject::SetReceiveBufferReadCursor(ssize_t newReadCursor)
175 {
176 recvBufferCursorR_ = newReadCursor;
177 }
178
GetSendBufferWriteCursor() const179 ssize_t BufferObject::GetSendBufferWriteCursor() const
180 {
181 return sendBufferCursorW_;
182 }
183
SetSendBufferWriteCursor(ssize_t newWriteCursor)184 void BufferObject::SetSendBufferWriteCursor(ssize_t newWriteCursor)
185 {
186 sendBufferCursorW_ = newWriteCursor;
187 }
188
GetSendBufferReadCursor() const189 ssize_t BufferObject::GetSendBufferReadCursor() const
190 {
191 return sendBufferCursorR_;
192 }
193
SetSendBufferReadCursor(ssize_t newReadCursor)194 void BufferObject::SetSendBufferReadCursor(ssize_t newReadCursor)
195 {
196 sendBufferCursorR_ = newReadCursor;
197 }
198
GetNeedBufferSize(uint32_t size) const199 uint32_t BufferObject::GetNeedBufferSize(uint32_t size) const
200 {
201 if (size <= SOCKET_BUFF_SIZE_USER_S) {
202 return SOCKET_BUFF_SIZE_USER_S;
203 } else if (size <= SOCKET_BUFF_SIZE_USER_M) {
204 return SOCKET_BUFF_SIZE_USER_M;
205 } else if (size <= SOCKET_BUFF_SIZE_USER_L) {
206 return SOCKET_BUFF_SIZE_USER_L;
207 } else if (size <= SOCKET_BUFF_SIZE_USER_HUGE) {
208 return SOCKET_BUFF_SIZE_USER_HUGE;
209 } else {
210 return 0;
211 }
212 }
213
GetSendBufferSize() const214 uint32_t BufferObject::GetSendBufferSize() const
215 {
216 return sendBuffSize_;
217 }
218
GetRecvBufferSize() const219 uint32_t BufferObject::GetRecvBufferSize() const
220 {
221 return recvBuffSize_;
222 }
223 } // namespace OHOS
224