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
19 namespace panda::panda_file {
20
FileWriter(const std::string & file_name)21 FileWriter::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
~FileWriter()32 FileWriter::~FileWriter()
33 {
34 if (file_ != nullptr) {
35 fclose(file_);
36 }
37 }
38
WriteByte(uint8_t data)39 bool 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
WriteBytes(const std::vector<uint8_t> & bytes)48 bool 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
FinishWrite()62 bool 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