diff options
Diffstat (limited to 'src/fs.h')
| -rw-r--r-- | src/fs.h | 51 |
1 files changed, 51 insertions, 0 deletions
@@ -7,6 +7,9 @@ #include <stdio.h> #include <string> +#if defined WIN32 && defined __GLIBCXX__ +#include <ext/stdio_filebuf.h> +#endif #include <boost/filesystem.hpp> #include <boost/filesystem/fstream.hpp> @@ -39,6 +42,54 @@ namespace fsbridge { }; std::string get_filesystem_error_message(const fs::filesystem_error& e); + + // GNU libstdc++ specific workaround for opening UTF-8 paths on Windows. + // + // On Windows, it is only possible to reliably access multibyte file paths through + // `wchar_t` APIs, not `char` APIs. But because the C++ standard doesn't + // require ifstream/ofstream `wchar_t` constructors, and the GNU library doesn't + // provide them (in contrast to the Microsoft C++ library, see + // https://stackoverflow.com/questions/821873/how-to-open-an-stdfstream-ofstream-or-ifstream-with-a-unicode-filename/822032#822032), + // Boost is forced to fall back to `char` constructors which may not work properly. + // + // Work around this issue by creating stream objects with `_wfopen` in + // combination with `__gnu_cxx::stdio_filebuf`. This workaround can be removed + // with an upgrade to C++17, where streams can be constructed directly from + // `std::filesystem::path` objects. + +#if defined WIN32 && defined __GLIBCXX__ + class ifstream : public std::istream + { + public: + ifstream() = default; + explicit ifstream(const fs::path& p, std::ios_base::openmode mode = std::ios_base::in) { open(p, mode); } + ~ifstream() { close(); } + void open(const fs::path& p, std::ios_base::openmode mode = std::ios_base::in); + bool is_open() { return m_filebuf.is_open(); } + void close(); + + private: + __gnu_cxx::stdio_filebuf<char> m_filebuf; + FILE* m_file = nullptr; + }; + class ofstream : public std::ostream + { + public: + ofstream() = default; + explicit ofstream(const fs::path& p, std::ios_base::openmode mode = std::ios_base::out) { open(p, mode); } + ~ofstream() { close(); } + void open(const fs::path& p, std::ios_base::openmode mode = std::ios_base::out); + bool is_open() { return m_filebuf.is_open(); } + void close(); + + private: + __gnu_cxx::stdio_filebuf<char> m_filebuf; + FILE* m_file = nullptr; + }; +#else // !(WIN32 && __GLIBCXX__) + typedef fs::ifstream ifstream; + typedef fs::ofstream ofstream; +#endif // WIN32 && __GLIBCXX__ }; #endif // BITCOIN_FS_H |