1/**
2 * Copyright (c) 2021-2022 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 "file_writer.h"
17#include "zlib.h"
18
19namespace panda::panda_file {
20
21FileWriter::FileWriter(const std::string &file_name) : checksum_(adler32(0, nullptr, 0))
22{
23#ifdef PANDA_TARGET_WINDOWS
24    constexpr char const *mode = "wb";
25#else
26    constexpr char const *mode = "wbe";
27#endif
28
29    file_ = fopen(file_name.c_str(), mode);
30}
31
32FileWriter::~FileWriter()
33{
34    if (file_ != nullptr) {
35        fclose(file_);
36    }
37}
38
39bool FileWriter::WriteByte(uint8_t data)
40{
41    if (LIKELY(count_checksum_)) {
42        checksum_ = adler32(checksum_, &data, 1u);
43    }
44    buffer_.push_back(data);
45    return true;
46}
47
48bool FileWriter::WriteBytes(const std::vector<uint8_t> &bytes)
49{
50    if (UNLIKELY(bytes.empty())) {
51        return true;
52    }
53
54    if (LIKELY(count_checksum_)) {
55        checksum_ = adler32(checksum_, bytes.data(), bytes.size());
56    }
57
58    buffer_.insert(buffer_.end(), bytes.begin(), bytes.end());
59    return true;
60}
61
62bool FileWriter::FinishWrite()
63{
64    if (file_ == nullptr) {
65        return false;
66    }
67    const auto &buf = GetBuffer();
68    auto length = buf.size();
69    bool ret = fwrite(buf.data(), sizeof(decltype(buf.back())), length, file_) == length;
70    fclose(file_);
71    file_ = nullptr;
72    return ret;
73}
74
75}  // namespace panda::panda_file
76