diff options
Diffstat (limited to 'contrib/epee/include/file_io_utils.h')
| -rw-r--r-- | contrib/epee/include/file_io_utils.h | 83 |
1 files changed, 82 insertions, 1 deletions
diff --git a/contrib/epee/include/file_io_utils.h b/contrib/epee/include/file_io_utils.h index 989d16fba..196610674 100644 --- a/contrib/epee/include/file_io_utils.h +++ b/contrib/epee/include/file_io_utils.h @@ -31,6 +31,31 @@ #include <iostream> #include <boost/filesystem/path.hpp> #include <boost/filesystem/operations.hpp> +#ifdef WIN32 +#include <windows.h> +#endif + +// On Windows there is a problem with non-ASCII characters in path and file names +// as far as support by the standard components used is concerned: + +// The various file stream classes, e.g. std::ifstream and std::ofstream, are +// part of the GNU C++ Library / libstdc++. On the most basic level they use the +// fopen() call as defined / made accessible to programs compiled within MSYS2 +// by the stdio.h header file maintained by the MinGW project. + +// The critical point: The implementation of fopen() is part of MSVCRT, the +// Microsoft Visual C/C++ Runtime Library, and this method does NOT offer any +// Unicode support. + +// Monero code that would want to continue to use the normal file stream classes +// but WITH Unicode support could therefore not solve this problem on its own, +// but 2 different projects from 2 different maintaining groups would need changes +// in this particular direction - something probably difficult to achieve and +// with a long time to wait until all new versions / releases arrive. + +// Implemented solution approach: Circumvent the problem by stopping to use std +// file stream classes on Windows and directly use Unicode-capable WIN32 API +// calls. Most of the code doing so is concentrated in this header file here. namespace epee { @@ -46,7 +71,22 @@ namespace file_io_utils inline bool save_string_to_file(const std::string& path_to_file, const std::string& str) { - +#ifdef WIN32 + WCHAR wide_path[1000]; + int chars = MultiByteToWideChar(CP_UTF8, 0, path_to_file.c_str(), path_to_file.size() + 1, wide_path, 1000); + if (chars == 0) + return false; + HANDLE file_handle = CreateFileW(wide_path, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); + if (file_handle == INVALID_HANDLE_VALUE) + return false; + DWORD bytes_written; + DWORD bytes_to_write = (DWORD)str.size(); + BOOL result = WriteFile(file_handle, str.data(), bytes_to_write, &bytes_written, NULL); + CloseHandle(file_handle); + if (bytes_written != bytes_to_write) + result = FALSE; + return result; +#else try { std::ofstream fstream; @@ -61,6 +101,7 @@ namespace file_io_utils { return false; } +#endif } inline @@ -89,6 +130,27 @@ namespace file_io_utils inline bool load_file_to_string(const std::string& path_to_file, std::string& target_str) { +#ifdef WIN32 + WCHAR wide_path[1000]; + int chars = MultiByteToWideChar(CP_UTF8, 0, path_to_file.c_str(), path_to_file.size() + 1, wide_path, 1000); + if (chars == 0) + return false; + HANDLE file_handle = CreateFileW(wide_path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + if (file_handle == INVALID_HANDLE_VALUE) + return false; + DWORD file_size = GetFileSize(file_handle, NULL); + if ((file_size == INVALID_FILE_SIZE) || (file_size > 1000000000)) { + CloseHandle(file_handle); + return false; + } + target_str.resize(file_size); + DWORD bytes_read; + BOOL result = ReadFile(file_handle, &target_str[0], file_size, &bytes_read, NULL); + CloseHandle(file_handle); + if (bytes_read != file_size) + result = FALSE; + return result; +#else try { std::ifstream fstream; @@ -113,11 +175,13 @@ namespace file_io_utils { return false; } +#endif } inline bool append_string_to_file(const std::string& path_to_file, const std::string& str) { + // No special Windows implementation because so far not used in Monero code try { std::ofstream fstream; @@ -137,6 +201,22 @@ namespace file_io_utils inline bool get_file_size(const std::string& path_to_file, uint64_t &size) { +#ifdef WIN32 + WCHAR wide_path[1000]; + int chars = MultiByteToWideChar(CP_UTF8, 0, path_to_file.c_str(), path_to_file.size() + 1, wide_path, 1000); + if (chars == 0) + return false; + HANDLE file_handle = CreateFileW(wide_path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + if (file_handle == INVALID_HANDLE_VALUE) + return false; + LARGE_INTEGER file_size; + BOOL result = GetFileSizeEx(file_handle, &file_size); + CloseHandle(file_handle); + if (result) { + size = file_size.QuadPart; + } + return size; +#else try { std::ifstream fstream; @@ -151,6 +231,7 @@ namespace file_io_utils { return false; } +#endif } } |