Add support of .svgz image files to fluid

The  prototype of the public Fl_SVG_Image constructor is expanded
to allow construction from in-memory, gzip'ed binary data.

2 files changed, 32 insertions, 1 deletions

diff --git a/src/drivers/Posix/Fl_Posix_System_Driver.H b/src/drivers/Posix/Fl_Posix_System_Driver.H
index df9407c17..5712f6be2 100644
--- a/src/drivers/Posix/Fl_Posix_System_Driver.H
+++ b/src/drivers/Posix/Fl_Posix_System_Driver.H
@@ -82,6 +82,10 @@ public:
   virtual int dot_file_hidden() {return 1;}
   virtual void gettime(time_t *sec, int *usec);
   virtual char* strdup(const char *s) {return ::strdup(s);}
+  virtual int close_fd(int fd);
+  // next 2 for support of Fl_SVG_Image
+  virtual int write_nonblocking_fd(int , const unsigned char *&, size_t &);
+  virtual void pipe_support(int &, int &, const unsigned char *, size_t );
 #if defined(HAVE_PTHREAD)
   virtual void lock_ring();
   virtual void unlock_ring();
diff --git a/src/drivers/Posix/Fl_Posix_System_Driver.cxx b/src/drivers/Posix/Fl_Posix_System_Driver.cxx
index dcf9e8f1a..ec43ea741 100644
--- a/src/drivers/Posix/Fl_Posix_System_Driver.cxx
+++ b/src/drivers/Posix/Fl_Posix_System_Driver.cxx
@@ -1,7 +1,7 @@
 //
 // Definition of Posix system driver (used by the X11, Wayland and macOS platforms).
 //
-// Copyright 1998-2021 by Bill Spitzak and others.
+// Copyright 1998-2022 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -308,6 +308,33 @@ bool Fl_Posix_System_Driver::probe_for_GTK(int major, int minor, void **p_ptr_gt
 #endif // HAVE_DLSYM && HAVE_DLFCN_H
 
 
+int Fl_Posix_System_Driver::close_fd(int fd) { return close(fd); }
+
+int Fl_Posix_System_Driver::write_nonblocking_fd(int fdwrite, const unsigned char *&bytes, size_t &rest_bytes) {
+    if (rest_bytes > 0) {
+      ssize_t nw = write(fdwrite, bytes, rest_bytes);
+      if (nw == -1) {
+        close(fdwrite);
+        return 1; // error
+      }
+      bytes += nw;
+      rest_bytes -= nw;
+      if (rest_bytes == 0) close(fdwrite);
+    }
+  return 0; // success
+}
+
+void Fl_Posix_System_Driver::pipe_support(int &fdread, int &fdwrite, const unsigned char *unused, size_t unused_s) {
+  int fds[2];
+  if (pipe(fds)) { // create anonymous pipe
+    Fl_System_Driver::pipe_support(fdread, fdwrite, NULL, 0); // indicates error
+  } else {
+    fdread = fds[0];
+    fdwrite = fds[1];
+    fcntl(fdwrite, F_SETFL, O_NONBLOCK); // make pipe's write end non-blocking
+  }
+}
+
 ////////////////////////////////////////////////////////////////
 // POSIX threading...
 #if defined(HAVE_PTHREAD)