diff --git a/src/filesystem/implementations/local.h b/src/filesystem/implementations/local.h index 8e60054a6..109a42c34 100644 --- a/src/filesystem/implementations/local.h +++ b/src/filesystem/implementations/local.h @@ -60,12 +60,45 @@ class LocalFileSystem : public FileSystem { Status MakeTemporaryDirectory( std::string dir_path, std::string* temp_dir) override; Status DeletePath(const std::string& path) override; + + private: + inline std::string getOSValidPath(const std::string& _path); + const char* WindowsLongPathPrefix = "\\\\?\\"; }; + +//! Converts incoming utf-8 path to an OS valid path +//! +//! On Linux there is not much to do but make sure correct slashes are used +//! On Windows we need to take care of the long paths and handle them correctly +//! to avoid legacy issues with MAX_PATH +//! +//! More details: +//! https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry +//! +inline std::string +LocalFileSystem::getOSValidPath(const std::string& path) +{ + std::string l_path(path); +#ifdef _WIN32 + // On Windows long paths must be marked correctly otherwise, due to backwards + // compatibility, all paths are limited to MAX_PATH length + if (l_path.size() >= MAX_PATH) { + // Must be prefixed with "\\?\" to be considered long path + if (l_path.substr(0, 4) != (WindowsLongPathPrefix)) { + // Long path but not "tagged" correctly + l_path = (WindowsLongPathPrefix) + l_path; + } + } + std::replace(l_path.begin(), l_path.end(), '/', '\\'); +#endif + return l_path; +} + Status LocalFileSystem::FileExists(const std::string& path, bool* exists) { - *exists = (access(path.c_str(), F_OK) == 0); + *exists = (access(getOSValidPath(path).c_str(), F_OK) == 0); return Status::Success; } @@ -75,7 +108,7 @@ LocalFileSystem::IsDirectory(const std::string& path, bool* is_dir) *is_dir = false; struct stat st; - if (stat(path.c_str(), &st) != 0) { + if (stat(getOSValidPath(path).c_str(), &st) != 0) { return Status(Status::Code::INTERNAL, "failed to stat file " + path); } @@ -88,7 +121,7 @@ LocalFileSystem::FileModificationTime( const std::string& path, int64_t* mtime_ns) { struct stat st; - if (stat(path.c_str(), &st) != 0) { + if (stat(getOSValidPath(path).c_str(), &st) != 0) { return Status(Status::Code::INTERNAL, "failed to stat file " + path); } @@ -187,7 +220,7 @@ LocalFileSystem::GetDirectoryFiles( Status LocalFileSystem::ReadTextFile(const std::string& path, std::string* contents) { - std::ifstream in(path, std::ios::in | std::ios::binary); + std::ifstream in(getOSValidPath(path), std::ios::in | std::ios::binary); if (!in) { return Status( Status::Code::INTERNAL,