1 /*
2 * Copyright (c) 2022-2023 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 "circle_stream_buffer.h"
17
18 #include "devicestatus_define.h"
19
20 namespace OHOS {
21 namespace Msdp {
CopyDataToBegin()22 void CircleStreamBuffer::CopyDataToBegin()
23 {
24 int32_t residualSize = ResidualSize();
25 if (residualSize > 0 && rPos_ > 0) {
26 int32_t pos = 0;
27 for (int32_t i = rPos_; i <= wPos_;) {
28 szBuff_[pos++] = szBuff_[i++];
29 }
30 }
31 FI_HILOGD("ResidualSize:%{public}d rPos:%{public}d wPos:%{public}d", residualSize, rPos_, wPos_);
32 rPos_ = 0;
33 wPos_ = residualSize;
34 }
35
CheckWrite(size_t size)36 bool CircleStreamBuffer::CheckWrite(size_t size)
37 {
38 int32_t bufferSize = static_cast<int32_t>(size);
39 int32_t availableSize = GetAvailableBufSize();
40 if (bufferSize > availableSize && rPos_ > 0) {
41 CopyDataToBegin();
42 availableSize = GetAvailableBufSize();
43 }
44 return (availableSize >= bufferSize);
45 }
46
Write(const char * buf,size_t size)47 bool CircleStreamBuffer::Write(const char *buf, size_t size)
48 {
49 if (!CheckWrite(size)) {
50 FI_HILOGE("Out of buffer memory, availableSize:%{public}d, size:%{public}zu,"
51 "residualSize:%{public}d, rPos:%{public}d, wPos:%{public}d",
52 GetAvailableBufSize(), size, ResidualSize(), rPos_, wPos_);
53 return false;
54 }
55 return StreamBuffer::Write(buf, size);
56 }
57 } // namespace Msdp
58 } // namespace OHOS