1 /*
2 * Copyright 2018 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "file_handler.hpp"
18
19 #include <filesystem>
20 #include <ios>
21 #include <optional>
22 #include <utility>
23 #include <vector>
24
25 namespace ipmi_flash
26 {
27
open(const std::string & path,std::ios_base::openmode mode)28 bool FileHandler::open(const std::string& path, std::ios_base::openmode mode)
29 {
30 /* force binary mode */
31 mode |= std::ios::binary;
32 this->path = path;
33
34 if (file.is_open())
35 {
36 return true;
37 }
38 file.open(filename, mode);
39 return file.good();
40 }
41
close()42 void FileHandler::close()
43 {
44 file.close();
45 }
46
write(std::uint32_t offset,const std::vector<std::uint8_t> & data)47 bool FileHandler::write(std::uint32_t offset,
48 const std::vector<std::uint8_t>& data)
49 {
50 file.seekp(offset);
51 file.write(reinterpret_cast<const char*>(data.data()), data.size());
52 return file.good();
53 }
54
55 std::optional<std::vector<uint8_t>>
read(std::uint32_t offset,std::uint32_t size)56 FileHandler::read(std::uint32_t offset, std::uint32_t size)
57 {
58 uint32_t file_size = getSize();
59 if (offset > file_size)
60 {
61 return std::nullopt;
62 }
63 std::vector<uint8_t> ret(std::min(file_size - offset, size));
64 file.seekg(offset);
65 file.read(reinterpret_cast<char*>(ret.data()), ret.size());
66 if (!file.good())
67 {
68 return std::nullopt;
69 }
70 return ret;
71 }
72
getSize()73 int FileHandler::getSize()
74 {
75 std::error_code ec;
76 auto ret = std::filesystem::file_size(filename, ec);
77 if (ec)
78 {
79 auto error = ec.message();
80 std::fprintf(stderr, "Failed to get filesize `%s`: %s\n",
81 filename.c_str(), error.c_str());
82 return 0;
83 }
84 return ret;
85 }
86
87 } // namespace ipmi_flash
88