add PGF creation from scratch in memory

src/pgfimage.cpp

@@ -57,13 +57,38 @@ EXIV2_RCSID("@(#) $Id: pgfimage.cpp 1750 2009-02-16 14:30:51Z ahuggel $")
 // Signature from front of PGF file
 const unsigned char pgfSignature[3] = { 0x50, 0x47, 0x46 };
 
+const unsigned char pgfBlank[] = { 0x50,0x47,0x46,0x36,0x10,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+                                   0x00,0x00,0x18,0x03,0x03,0x00,0x00,0x00,0x14,0x00,0x67,0x08,0x20,0x00,0xc0,0x01,
+                                   0x00,0x00,0x37,0x00,0x00,0x78,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x37,0x00,
+                                   0x00,0x78,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x37,0x00,0x00,0x78,0x00,0x00,
+                                   0x00,0x00,0x01,0x00,0x00,0x00,0x37,0x00,0x00,0x78,0x00,0x00,0x00,0x00,0x01,0x00,
+                                   0x00,0x00,0x37,0x00,0x00,0x78,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x37,0x00,
+                                   0x00,0x78,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00
+                                 };
+
 // *****************************************************************************
 // class member definitions
 namespace Exiv2 {
 
-    PgfImage::PgfImage(BasicIo::AutoPtr io, bool /*create*/)
-            : Image(ImageType::pgf, mdExif | mdIptc | mdComment, io)
+    PgfImage::PgfImage(BasicIo::AutoPtr io, bool create)
+            : Image(ImageType::pgf, mdExif | mdIptc| mdXmp | mdComment, io)
+    {
+        if (create)
+        {
+            if (io_->open() == 0)
+            {
+#ifdef DEBUG
+                std::cerr << "Exiv2::PgfImage:: Creating PGF image to memory\n";
+#endif
+                IoCloser closer(*io_);
+                if (io_->write(pgfBlank, sizeof(pgfBlank)) != sizeof(pgfBlank))
                 {
+#ifdef DEBUG
+                    std::cerr << "Exiv2::PgfImage:: Failed to create PGF image on memory\n";
+#endif
+                }
+            }
+        }
     } // PgfImage::PgfImage
 
     void PgfImage::readMetadata()

src/pgfimage.hpp

@@ -77,7 +77,6 @@ namespace Exiv2
               method to get a temporary reference.
           @param create Specifies if an existing image should be read (false)
               or if a new file should be created (true).
-              This option is not yet implemented.
          */
         PgfImage(BasicIo::AutoPtr io, bool create);
         //@}