git / moonbite-core / src/fs.h · raw

// Copyright (c) 2017-2019 The Bitcoin Core developers// Distributed under the MIT software license, see the accompanying// file COPYING or http://www.opensource.org/licenses/mit-license.php.#ifndef BITCOIN_FS_H#define BITCOIN_FS_H#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>/** Filesystem operations and types */namespace fs = boost::filesystem;/** Bridge operations to C stdio */namespace fsbridge {    FILE *fopen(const fs::path& p, const char *mode);    class FileLock    {    public:        FileLock() = delete;        FileLock(const FileLock&) = delete;        FileLock(FileLock&&) = delete;        explicit FileLock(const fs::path& file);        ~FileLock();        bool TryLock();        std::string GetReason() { return reason; }    private:        std::string reason;#ifndef WIN32        int fd = -1;#else        void* hFile = (void*)-1; // INVALID_HANDLE_VALUE#endif    };    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