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