Support std::filesystem::path in TFile and TFileHandle

2 files changed, 107 insertions, 9 deletions

diff --git a/util/system/file.cpp b/util/system/file.cpp
index 4a261d020c..814b538b6f 100644
--- a/util/system/file.cpp
+++ b/util/system/file.cpp
@@ -63,7 +63,18 @@ static bool IsStupidFlagCombination(EOpenMode oMode) {
     return (oMode & (CreateAlways | ForAppend)) == (CreateAlways | ForAppend) || (oMode & (TruncExisting | ForAppend)) == (TruncExisting | ForAppend) || (oMode & (CreateNew | ForAppend)) == (CreateNew | ForAppend);
 }
 
-TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
+#if defined(_win_)
+
+static SECURITY_ATTRIBUTES ConvertToSecAttrs(EOpenMode oMode) {
+    bool closeOnExec = (oMode & CloseOnExec);
+    SECURITY_ATTRIBUTES secAttrs;
+    secAttrs.bInheritHandle = closeOnExec ? FALSE : TRUE;
+    secAttrs.lpSecurityDescriptor = nullptr;
+    secAttrs.nLength = sizeof(secAttrs);
+    return secAttrs;
+}
+
+TFileHandle::TFileHandle(const StdFilesystemPath& path, EOpenMode oMode) noexcept {
     ui32 fcMode = 0;
     EOpenMode createMode = oMode & MaskCreation;
     Y_VERIFY(!IsStupidFlagCombination(oMode), "oMode %d makes no sense", static_cast<int>(oMode));
@@ -74,8 +85,6 @@ TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
         oMode |= ARW;
     }
 
-#ifdef _win_
-
     switch (createMode) {
         case OpenExisting:
             fcMode = OPEN_EXISTING;
@@ -111,8 +120,6 @@ TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
         faMode &= ~FILE_WRITE_DATA;
     }
 
-    bool inheritHandle = !(oMode & CloseOnExec);
-
     ui32 shMode = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
 
     ui32 attrMode = FILE_ATTRIBUTE_NORMAL;
@@ -134,14 +141,43 @@ TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
         attrMode |= /*FILE_FLAG_NO_BUFFERING |*/ FILE_FLAG_WRITE_THROUGH;
     }
 
-    Fd_ = NFsPrivate::CreateFileWithUtf8Name(fName, faMode, shMode, fcMode, attrMode, inheritHandle);
+    SECURITY_ATTRIBUTES secAttrs = ConvertToSecAttrs(oMode);
+
+    Fd_ = ::CreateFileW(
+        path.c_str(),
+        faMode,
+        shMode,
+        &secAttrs,
+        fcMode,
+        attrMode,
+        /* hTemplateHandle = */ nullptr);
 
     if ((oMode & ::ForAppend) && (Fd_ != INVALID_FHANDLE)) {
         ::SetFilePointer(Fd_, 0, 0, FILE_END);
     }
+}
+
+TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept
+    : TFileHandle{
+          std::filesystem::path(
+              std::u8string_view(reinterpret_cast<const char8_t*>(fName.data()), fName.size())),
+          oMode,
+      }
+{
+}
 
 #elif defined(_unix_)
+TFileHandle::TFileHandle(const StdFilesystemPath& path, EOpenMode oMode) noexcept {
+    ui32 fcMode = 0;
+    Y_VERIFY(!IsStupidFlagCombination(oMode), "oMode %d makes no sense", static_cast<int>(oMode));
+    if (!(oMode & MaskRW)) {
+        oMode |= RdWr;
+    }
+    if (!(oMode & AMask)) {
+        oMode |= ARW;
+    }
 
+    EOpenMode createMode = oMode & MaskCreation;
     switch (createMode) {
         case OpenExisting:
             fcMode = 0;
@@ -239,7 +275,7 @@ TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
     }
 
     do {
-        Fd_ = ::open(fName.data(), fcMode, permMode);
+        Fd_ = ::open(path.c_str(), fcMode, permMode);
     } while (Fd_ == -1 && errno == EINTR);
 
     #if HAVE_POSIX_FADVISE
@@ -260,11 +296,28 @@ TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept {
 
     //temp file
     if (Fd_ >= 0 && (oMode & Transient)) {
-        unlink(fName.data());
+    #if defined(_ios_) && defined(USE_STL_SYSTEM)
+        ::unlink(path.c_str());
+    #else
+        std::filesystem::remove(path);
+    #endif
     }
+}
+
+TFileHandle::TFileHandle(const TString& fName, EOpenMode oMode) noexcept
+    : TFileHandle{
+          StdFilesystemPath(fName.ConstRef()),
+          oMode,
+      }
+{
+}
 #else
     #error unsupported platform
 #endif
+
+TFileHandle::TFileHandle(const char* fName, EOpenMode oMode) noexcept
+    : TFileHandle(TString(fName), oMode)
+{
 }
 
 bool TFileHandle::Close() noexcept {
@@ -849,12 +902,34 @@ public:
     {
     }
 
+    inline TImpl(const char* fName, EOpenMode oMode)
+        : Handle_(fName, oMode)
+        , FileName_(fName)
+    {
+        if (!Handle_.IsOpen()) {
+            ythrow TFileError() << "can't open " << FileName_.Quote() << " with mode " << DecodeOpenMode(oMode) << " (" << Hex(oMode.ToBaseType()) << ")";
+        }
+    }
+
     inline TImpl(const TString& fName, EOpenMode oMode)
         : Handle_(fName, oMode)
         , FileName_(fName)
     {
         if (!Handle_.IsOpen()) {
-            ythrow TFileError() << "can't open " << fName.Quote() << " with mode " << DecodeOpenMode(oMode) << " (" << Hex(oMode.ToBaseType()) << ")";
+            ythrow TFileError() << "can't open " << FileName_.Quote() << " with mode " << DecodeOpenMode(oMode) << " (" << Hex(oMode.ToBaseType()) << ")";
+        }
+    }
+
+    inline TImpl(const StdFilesystemPath& path, EOpenMode oMode)
+        : Handle_(path, oMode)
+#if defined(_ios_) && defined(USE_STL_SYSTEM)
+        , FileName_(path)
+#else
+        , FileName_(path.string())
+#endif
+    {
+        if (!Handle_.IsOpen()) {
+            ythrow TFileError() << "can't open " << FileName_.Quote() << " with mode " << DecodeOpenMode(oMode) << " (" << Hex(oMode.ToBaseType()) << ")";
         }
     }
 
@@ -1102,11 +1177,21 @@ TFile::TFile(FHANDLE fd, const TString& name)
 {
 }
 
+TFile::TFile(const char* fName, EOpenMode oMode)
+    : Impl_(new TImpl(fName, oMode))
+{
+}
+
 TFile::TFile(const TString& fName, EOpenMode oMode)
     : Impl_(new TImpl(fName, oMode))
 {
 }
 
+TFile::TFile(const StdFilesystemPath& path, EOpenMode oMode)
+    : Impl_(new TImpl(path, oMode))
+{
+}
+
 TFile::~TFile() = default;
 
 void TFile::Close() {
diff --git a/util/system/file.h b/util/system/file.h
index bb42bc7697..6b5e51cb59 100644
--- a/util/system/file.h
+++ b/util/system/file.h
@@ -8,6 +8,15 @@
 #include <util/generic/noncopyable.h>
 
 #include <cstdio>
+#include <filesystem>
+
+#if defined(_ios_) && defined(USE_STL_SYSTEM)
+// Workaround for
+// std::filesystem::path is unavailable: introduced in iOS 13.0
+using StdFilesystemPath = std::string;
+#else
+using StdFilesystemPath = std::filesystem::path;
+#endif
 
 enum EOpenModeFlag {
     OpenExisting = 0,  // Opens a file. It fails if the file does not exist.
@@ -76,7 +85,9 @@ public:
         other.Fd_ = INVALID_FHANDLE;
     }
 
+    TFileHandle(const char* fName, EOpenMode oMode) noexcept;
     TFileHandle(const TString& fName, EOpenMode oMode) noexcept;
+    TFileHandle(const StdFilesystemPath& path, EOpenMode oMode) noexcept;
 
     inline ~TFileHandle() {
         Close();
@@ -150,7 +161,9 @@ public:
     /// Takes ownership of handle, so closes it when the last holder of descriptor dies.
     explicit TFile(FHANDLE fd);
     TFile(FHANDLE fd, const TString& fname);
+    TFile(const char* fName, EOpenMode oMode);
     TFile(const TString& fName, EOpenMode oMode);
+    TFile(const StdFilesystemPath& path, EOpenMode oMode);
     ~TFile();
 
     void Close();