Add fl_open_ext() to control whether the file is opened in binary/text mode.

This new function allows to write Fl_SVG_Image::fl_gzopen() in a completely platform-independent way.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12489 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_System_Driver.H

@@ -87,6 +87,7 @@ public:
   virtual char *getenv(const char* v) {return NULL;}
   virtual int putenv(char* v) {return -1;}
   virtual int open(const char* f, int oflags, int pmode) {return -1;}
+  virtual int open_ext(const char* f, int translation, int oflags, int pmode) {return this->open(f, oflags, pmode);}
   virtual FILE *fopen(const char* f, const char *mode);
   virtual int system(const char* cmd) {return -1;}
   virtual int execvp(const char *file, char *const *argv) {return -1;}

FL/fl_utf8.h

@@ -177,6 +177,8 @@ FL_EXPORT int fl_execvp(const char *file, char *const *argv);
 /* OD: Portable UTF-8 aware open wrapper */
 FL_EXPORT int fl_open(const char* f, int o, ...);
 
+FL_EXPORT int fl_open_ext(const char* fname, int translation, int oflags, ...);
+
 /* OD: Portable UTF-8 aware unlink wrapper */
 FL_EXPORT int fl_unlink(const char *f);
 

src/Fl_SVG_Image.cxx

@@ -28,9 +28,6 @@
 #include <stdlib.h>
 #if defined(HAVE_LIBZ)
 #include <zlib.h>
-#  ifdef _WIN32
-#    include <fcntl.h>
-#  endif
 #endif
 
 #if !defined(HAVE_LONG_LONG)
@@ -82,11 +79,7 @@ float Fl_SVG_Image::svg_scaling_(int W, int H) {
 /** Opens for reading a potentially gzip'ed file identified by a UTF-8 encoded filename. */
 void* Fl_SVG_Image::fl_gzopen(const char *fname) {
 #if defined(HAVE_LIBZ)
-  int flags = 0;
-#  ifdef _WIN32
-  flags = _O_BINARY;
-#  endif
-  int fd = fl_open(fname, flags);
+  int fd = fl_open_ext(fname, 0, 0);
   if (fd < 0) return NULL;
   return gzdopen(fd, "r");
 #else

src/drivers/WinAPI/Fl_WinAPI_System_Driver.H

@@ -50,6 +50,7 @@ public:
   virtual char *getenv(const char* v);
   virtual int putenv(char* v) {return _putenv(v);}
   virtual int open(const char* f, int oflags, int pmode);
+  virtual int open_ext(const char* f, int translation, int oflags, int pmode);
   virtual FILE *fopen(const char* f, const char *mode);
   virtual int system(const char* cmd);
   virtual int execvp(const char *file, char *const *argv);

src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx

@@ -42,6 +42,7 @@ typedef RPC_STATUS (WINAPI* uuid_func)(UUID __RPC_FAR *Uuid);
 #include <time.h>
 #include <direct.h>
 #include <io.h>
+#include <fcntl.h>
 // Apparently Borland C++ defines DIRECTORY in <direct.h>, which
 // interfers with the Fl_File_Icon enumeration of the same name.
 #  ifdef DIRECTORY
@@ -136,6 +137,12 @@ int Fl_WinAPI_System_Driver::open(const char* f, int oflags, int pmode) {
   else return _wopen(wbuf, oflags, pmode);
 }
 
+int Fl_WinAPI_System_Driver::open_ext(const char* f, int translation, int oflags, int pmode) {
+  if (oflags == 0) oflags = _O_RDONLY;
+  oflags |= (translation ? _O_TEXT : _O_BINARY);
+  return this->open(f, oflags, pmode);
+}
+
 FILE *Fl_WinAPI_System_Driver::fopen(const char* f, const char *mode) {
   size_t l = strlen(f);
   unsigned wn = fl_utf8toUtf16(f, (unsigned) l, NULL, 0) + 1; // Query length

src/fl_utf8.cxx

@@ -309,7 +309,7 @@ char *fl_getenv(const char* v) {
  \param f  the UTF-8 encoded filename
  \param oflags  other arguments are as in the standard open() function
  \return  a file descriptor upon successful completion, or -1 in case of error.
- \sa fl_fopen().
+ \sa fl_fopen(), fl_open_ext().
  */
 int fl_open(const char* f, int oflags, ...)
 {
@@ -321,6 +321,28 @@ int fl_open(const char* f, int oflags, ...)
   return Fl::system_driver()->open(f, oflags, pmode);
 }
 
+/** Cross-platform function to open files with a UTF-8 encoded name.
+ In comparison with fl_open(), this function allows to control whether
+ the file is opened in binary (a.k.a. untranslated) mode. This is especially
+ useful under the MSWindows platform where files are by default opened in
+ text (translated) mode.
+ \param fname  the UTF-8 encoded filename
+ \param translation if zero, the file is to be accessed in untranslated (a.k.a. binary)
+ mode.
+ \param oflags,...  these arguments are as in the standard open() function.
+ Setting \p oflags to zero opens the file for reading.
+ \return  a file descriptor upon successful completion, or -1 in case of error.
+ */
+int fl_open_ext(const char* fname, int translation, int oflags, ...)
+{
+  int pmode;
+  va_list ap;
+  va_start(ap, oflags);
+  pmode = va_arg (ap, int);
+  va_end(ap);
+  return Fl::system_driver()->open_ext(fname, translation, oflags, pmode);
+}
+
 
 /** Cross-platform function to open files with a UTF-8 encoded name.