Backport stdio large file support for VC++ and mingw.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@63300 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/filefn.h

@@ -166,7 +166,9 @@ enum wxFileKind
         defined(__BORLANDC__) \
       )
 
+    // temporary defines just used immediately below
     #undef wxHAS_HUGE_FILES
+    #undef wxHAS_HUGE_STDIO_FILES
 
     // detect compilers which have support for huge files
     #if defined(__VISUALC__)
@@ -177,6 +179,17 @@ enum wxFileKind
         #define wxHAS_HUGE_FILES 1
     #endif
 
+    // detect compilers which have support for huge stdio files
+    #if defined __VISUALC__ && __VISUALC__ >= 1400
+        #define wxHAS_HUGE_STDIO_FILES
+        #define wxFseek _fseeki64
+        #define wxFtell _ftelli64
+    #elif wxCHECK_MINGW32_VERSION(3, 5) // mingw-runtime version (not gcc)
+        #define wxHAS_HUGE_STDIO_FILES
+        #define wxFseek fseeko64
+        #define wxFtell ftello64
+    #endif
+
     // other Windows compilers (DMC, Watcom, Metrowerks and Borland) don't have
     // huge file support (or at least not all functions needed for it by wx)
     // currently
@@ -381,16 +394,19 @@ enum wxFileKind
     #endif // wxHAS_UNDERSCORES_IN_POSIX_IDENTS
 
     #ifdef wxHAS_HUGE_FILES
-        // wxFile is present and supports large files. Currently wxFFile
+        // wxFile is present and supports large files.
-        // doesn't have large file support with any Windows compiler (even
-        // Win64 ones).
         #if wxUSE_FILE
             #define wxHAS_LARGE_FILES
         #endif
+        // wxFFile is present and supports large files
+        #if wxUSE_FFILE && defined wxHAS_HUGE_STDIO_FILES
+            #define wxHAS_LARGE_FFILES
+        #endif
     #endif
 
-    // it's a private define, undefine it so that nobody gets tempted to use it
+    // private defines, undefine so that nobody gets tempted to use
     #undef wxHAS_HUGE_FILES
+    #undef wxHAS_HUGE_STDIO_FILES
 #else // Unix or Windows using unknown compiler, assume POSIX supported
     typedef off_t wxFileOffset;
     #ifdef _LARGE_FILES
@@ -405,6 +421,10 @@ enum wxFileKind
         #if SIZEOF_LONG == 8 || defined HAVE_FSEEKO
             #define wxHAS_LARGE_FFILES
         #endif
+        #ifdef HAVE_FSEEKO
+            #define wxFseek fseeko
+            #define wxFtell ftello
+        #endif
     #else
         #define wxFileOffsetFmtSpec wxT("")
     #endif
@@ -443,6 +463,15 @@ enum wxFileKind
     #define wxHAS_NATIVE_LSTAT
 #endif // platforms
 
+// define wxFseek/wxFtell to large file versions if available (done above) or
+// to fseek/ftell if not, to save ifdefs in using code
+#ifndef wxFseek
+    #define wxFseek fseek
+#endif
+#ifndef wxFtell
+    #define wxFtell ftell
+#endif
+
 #ifdef O_BINARY
     #define wxO_BINARY O_BINARY
 #else

include/wx/platform.h

@@ -578,6 +578,8 @@
 #else
 #    undef wxCHECK_W32API_VERSION
 #    define wxCHECK_W32API_VERSION(maj, min) (0)
+#    undef wxCHECK_MINGW32_VERSION
+#    define wxCHECK_MINGW32_VERSION(maj, min) (0)
 #endif
 
 #if defined (__WXMSW__)

src/common/ffile.cpp

@@ -41,18 +41,6 @@
 // implementation
 // ============================================================================
 
-// ----------------------------------------------------------------------------
-// seek and tell with large file support if available
-// ----------------------------------------------------------------------------
-
-#ifdef HAVE_FSEEKO
-#   define wxFseek fseeko
-#   define wxFtell ftello
-#else
-#   define wxFseek fseek
-#   define wxFtell ftell
-#endif
-
 // ----------------------------------------------------------------------------
 // opening the file
 // ----------------------------------------------------------------------------
@@ -206,7 +194,7 @@ bool wxFFile::Seek(wxFileOffset ofs, wxSeekMode mode)
             break;
     }
 
-#ifndef HAVE_FSEEKO
+#ifndef wxHAS_LARGE_FFILES
     if ((long)ofs != ofs)
     {
         wxLogError(_("Seek error on file '%s' (large files not supported by stdio)"), m_name.c_str());

tests/streams/largefile.cpp

@@ -256,8 +256,8 @@ wxOutputStream *LargeFileTest_wxFFile::MakeOutStream(const wxString& name) const
 
 bool LargeFileTest_wxFFile::HasLFS() const
 {
-#ifdef HAVE_FSEEKO
+#ifdef wxHAS_LARGE_FFILES
-    return (wxFileOffset)0xffffffff > 0;
+    return true;
 #else
     return false;
 #endif