63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
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#include "filesystem.hpp"
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#include <vanetza/common/byte_buffer.hpp>
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#include <fstream>
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#include <stdexcept>
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#include <system_error>
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namespace vanetza
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{
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namespace pki
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{
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namespace
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{
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void write_file(const std::filesystem::path& path, const ByteBuffer& buffer)
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{
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std::ofstream ofs(path, std::ios::binary | std::ios::trunc);
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if (!ofs) {
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throw std::runtime_error("could not open " + path.string() + " for writing");
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}
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ofs.write(reinterpret_cast<const char*>(buffer.data()), buffer.size());
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ofs.flush();
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if (!ofs) {
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throw std::runtime_error("could not write " + path.string());
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}
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}
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} // namespace
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void write(const std::filesystem::path& path, const ByteBuffer& buffer)
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{
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// Write to temporary file first and atomically rename it later
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std::filesystem::path tmp = path;
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tmp += ".tmp";
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try {
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write_file(tmp, buffer);
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std::filesystem::rename(tmp, path);
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} catch (...) {
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// clean up temporary file
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std::error_code ec;
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std::filesystem::remove(tmp, ec);
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throw;
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}
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}
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ByteBuffer read(const std::filesystem::path& path)
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{
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std::ifstream ifs(path, std::ios::binary);
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if (!ifs) {
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throw std::runtime_error("could not open " + path.string() + " for reading");
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}
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ByteBuffer buffer { std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>() };
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if (ifs.bad()) {
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throw std::runtime_error("I/O error while reading " + path.string());
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}
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return buffer;
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}
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} // namespace pki
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} // namespace vanetza
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