[glom/gtkmm4: 6/9] Update GdaBinary/GdaBlob code for libgdamm-6.0.

[Murray Cumming <murrayc src gnome org>]

commit eafac55ad3b744f6d947b91e411b8e1371d1e529
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Dec 16 16:44:36 2016 +0100

    Update GdaBinary/GdaBlob code for libgdamm-6.0.

 glom/libglom/data_structure/field.cc               |   24 +++++++++----
 .../libglom/python_embed/pygdavalue_conversions.cc |   22 +++++++++---
 glom/utility_widgets/dialog_image_load_progress.cc |   35 +++++++++++--------
 glom/utility_widgets/dialog_image_load_progress.h  |    5 ++-
 glom/utility_widgets/dialog_image_save_progress.cc |   26 +++++++++------
 glom/utility_widgets/dialog_image_save_progress.h  |    2 +-
 glom/utils_ui.cc                                   |   11 ++++--
 7 files changed, 80 insertions(+), 45 deletions(-)
---
diff --git a/glom/libglom/data_structure/field.cc b/glom/libglom/data_structure/field.cc
index 2ca038a..9f5a455 100644
--- a/glom/libglom/data_structure/field.cc
+++ b/glom/libglom/data_structure/field.cc
@@ -255,7 +255,9 @@ Glib::ustring Field::to_file_format(const Gnome::Gda::Value& value, glom_field_t
         return Glib::ustring();
       else
       {
-        auto base64 = g_base64_encode(gdabinary->data, gdabinary->binary_length);
+        const auto data = gda_binary_get_data(gdabinary);
+        const auto data_len = gda_binary_get_size(gdabinary);
+        auto base64 = g_base64_encode(static_cast<const guchar*>(data), data_len);
         if(!base64)
           return Glib::ustring();
         else
@@ -268,18 +270,24 @@ Glib::ustring Field::to_file_format(const Gnome::Gda::Value& value, glom_field_t
     {
       const auto gdablob = gda_value_get_blob(value.gobj());
 
-      if(!gdablob || !gdablob->op)
+      if(!gdablob)
         return Glib::ustring();
       else
       {
-        if(!gda_blob_op_read_all(gdablob->op, const_cast<GdaBlob*>(gdablob)))
+        const auto op = gda_blob_get_op(const_cast<GdaBlob*>(gdablob));
+        if (!op)
+          return Glib::ustring();
+
+        if(!gda_blob_op_read_all(op, const_cast<GdaBlob*>(gdablob)))
         {
           return Glib::ustring();
         }
         else
         {
-          const auto gdabinary = &(gdablob->data);
-          auto base64 = g_base64_encode(gdabinary->data, gdabinary->binary_length);
+          const auto gdabinary = gda_blob_get_binary(const_cast<GdaBlob*>(gdablob));
+          const auto data = gda_binary_get_data(gdabinary);
+          const auto data_len = gda_binary_get_size(gdabinary);
+          auto base64 = g_base64_encode(static_cast<const guchar*>(data), data_len);
           if(!base64)
             return Glib::ustring();
           else
@@ -367,10 +375,10 @@ Gnome::Gda::Value Field::from_file_format(const Glib::ustring& str, glom_field_t
     } else {
       //What we use now in new files:
 
-      auto gdabinary = g_new(GdaBinary, 1);
+      auto gdabinary = gda_binary_new();
       gsize len = 0;
-      gdabinary->data = g_base64_decode(string_unescaped.c_str(), &len);
-      gdabinary->binary_length = len;
+      const auto data = g_base64_decode(string_unescaped.c_str(), &len);
+      gda_binary_set_data(gdabinary, data, len);
 
       Gnome::Gda::Value value;
       value_reinit(value.gobj(), GDA_TYPE_BINARY);
diff --git a/glom/libglom/python_embed/pygdavalue_conversions.cc 
b/glom/libglom/python_embed/pygdavalue_conversions.cc
index f39766b..2e98d96 100644
--- a/glom/libglom/python_embed/pygdavalue_conversions.cc
+++ b/glom/libglom/python_embed/pygdavalue_conversions.cc
@@ -201,15 +201,25 @@ boost::python::object glom_pygda_value_as_boost_pyobject(const Glib::ValueBase&
         ret = boost::python::object(g_value_get_uint64(boxed));
     } else if(value_type == GDA_TYPE_BINARY) {
         const auto gdabinary = gda_value_get_binary(boxed);
-        if(gdabinary)
-          ret = boost::python::object((const char*)gdabinary->data); /* TODO: Use the size. TODO: Check for 
null GdaBinary. */
+        if(gdabinary) {
+          const auto data = gda_binary_get_data(gdabinary);
+          ret = boost::python::object((const char*)data); /* TODO: Use the size. TODO: Check for null 
GdaBinary. */
+        }
     } else if(value_type == GDA_TYPE_BLOB) {
         const auto gdablob = gda_value_get_blob (boxed);
-        if(gdablob && gdablob->op)
-        {
-          if(gda_blob_op_read_all(gdablob->op, const_cast<GdaBlob*>(gdablob)))
+        if(gdablob) {
+          const auto op = gda_blob_get_op(const_cast<GdaBlob*>(gdablob));
+          if (op)
           {
-            ret = boost::python::object((const char*)gdablob->data.data); /* TODO: Use the size. TODO: Check 
for null GdaBinary. */
+            if(gda_blob_op_read_all(op, const_cast<GdaBlob*>(gdablob)))
+            {
+              const auto gdabinary = gda_blob_get_binary(const_cast<GdaBlob*>(gdablob));
+              if (gdabinary)
+              {
+                const auto data = gda_binary_get_data(gdabinary);
+                ret = boost::python::object((const char*)data); /* TODO: Use the size. TODO: Check for null 
GdaBinary. */
+              }
+            }
           }
         }
     } else if(value_type == G_TYPE_BOOLEAN) {
diff --git a/glom/utility_widgets/dialog_image_load_progress.cc 
b/glom/utility_widgets/dialog_image_load_progress.cc
index ea7747f..160cdea 100644
--- a/glom/utility_widgets/dialog_image_load_progress.cc
+++ b/glom/utility_widgets/dialog_image_load_progress.cc
@@ -40,7 +40,8 @@ const char* DialogImageLoadProgress::glade_id("dialog_image_load_progress");
 const bool DialogImageLoadProgress::glade_developer(false);
 
 DialogImageLoadProgress::DialogImageLoadProgress(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& 
builder)
-: Gtk::Dialog(cobject)
+: Gtk::Dialog(cobject),
+  m_data(nullptr, &gda_binary_free)
 {
   builder->get_widget("progress_bar", m_progress_bar);
 
@@ -53,7 +54,7 @@ DialogImageLoadProgress::DialogImageLoadProgress(BaseObjectType* cobject, const
 DialogImageLoadProgress::~DialogImageLoadProgress()
 {
   if(m_data)
-    g_free(m_data->data);
+    gda_binary_free(m_data.get());
 
   // TODO: Cancel outstanding async operations in destructor?
 }
@@ -63,9 +64,7 @@ void DialogImageLoadProgress::load(const Glib::ustring& uri)
   // Can only load one file with data
   g_assert(!m_data.get());
 
-  m_data = std::make_unique<GdaBinary>();
-  m_data->data = nullptr;
-  m_data->binary_length = 0;
+  m_data = UniquePtr(gda_binary_new(), &gda_binary_free);
 
   m_file = Gio::File::create_for_uri(uri);
   m_progress_bar->set_text(Glib::ustring::compose("Loading %1...", m_file->get_parse_name()));
@@ -100,15 +99,17 @@ void DialogImageLoadProgress::on_query_info(const Glib::RefPtr<Gio::AsyncResult>
   try
   {
     auto info = m_stream->query_info_finish(result);
-    m_data->binary_length = info->get_size();
 
     // We need to use the glib allocator here:
-    m_data->data = static_cast<guchar*>(g_try_malloc(m_data->binary_length));
-    if(!m_data->data)
+    const auto data_len = info->get_size();
+    const auto data = static_cast<guchar*>(g_try_malloc(data_len));
+    gda_binary_set_data(m_data.get(), data, data_len);
+    if(!data)
       error(_("Not enough memory available to load the image"));
 
     // Read the first chunk from the file
-    m_stream->read_async(m_data->data, std::min<gsize>(CHUNK_SIZE, m_data->binary_length), 
sigc::bind(sigc::mem_fun(*this, &DialogImageLoadProgress::on_stream_read), 0));
+    m_stream->read_async(data, std::min<gsize>(CHUNK_SIZE, data_len),
+      sigc::bind(sigc::mem_fun(*this, &DialogImageLoadProgress::on_stream_read), 0));
   }
   catch(const Glib::Error& ex)
   {
@@ -124,13 +125,14 @@ void DialogImageLoadProgress::on_stream_read(const Glib::RefPtr<Gio::AsyncResult
     g_assert(size >= 0); // Would have thrown an exception otherwise
 
     // Cannot read more data than there is available in the file:
-    g_assert( static_cast<gssize>(offset + size) <= static_cast<gssize>(m_data->binary_length));
+    const auto data_len = gda_binary_get_size(m_data.get());
+    g_assert( static_cast<gssize>(offset + size) <= static_cast<gssize>(data_len));
 
     // Set progress
-    m_progress_bar->set_fraction(static_cast<double>(offset + size) / m_data->binary_length);
+    m_progress_bar->set_fraction(static_cast<double>(offset + size) / data_len);
 
     // Read next chunk, if any
-    if( static_cast<gssize>(offset + size) < static_cast<gssize>(m_data->binary_length) )
+    if( static_cast<gssize>(offset + size) < static_cast<gssize>(data_len) )
     {
       // Even if choose a priority lower than GDK_PRIORITY_REDRAW + 10 for the
       // read_async we don't see the progressbar progressing while the image
@@ -150,9 +152,12 @@ void DialogImageLoadProgress::on_stream_read(const Glib::RefPtr<Gio::AsyncResult
 
 void DialogImageLoadProgress::on_read_next(unsigned int at)
 {
-  g_assert(at < static_cast<gsize>(m_data->binary_length));
+  const auto data_len = gda_binary_get_size(m_data.get());
+  g_assert(at < static_cast<gsize>(data_len));
 
-  m_stream->read_async(m_data->data + at, std::min<gsize>(CHUNK_SIZE, m_data->binary_length - at), 
sigc::bind(sigc::mem_fun(*this, &DialogImageLoadProgress::on_stream_read), at));
+  const auto data = gda_binary_get_data(m_data.get());
+  m_stream->read_async(static_cast<guchar*>(data) + at, std::min<gsize>(CHUNK_SIZE, data_len - at),
+    sigc::bind(sigc::mem_fun(*this, &DialogImageLoadProgress::on_stream_read), at));
 }
 
 void DialogImageLoadProgress::error(const Glib::ustring& error_message)
@@ -165,7 +170,7 @@ void DialogImageLoadProgress::error(const Glib::ustring& error_message)
   response(Gtk::RESPONSE_REJECT);
 }
 
-std::unique_ptr<GdaBinary> DialogImageLoadProgress::get_image_data()
+DialogImageLoadProgress::UniquePtr DialogImageLoadProgress::get_image_data()
 {
   //This will not be as if it was reset.
   //Not every std::move() does that, but std::move() with std::unique_ptr<> does.
diff --git a/glom/utility_widgets/dialog_image_load_progress.h 
b/glom/utility_widgets/dialog_image_load_progress.h
index 989a6d8..6083a5d 100644
--- a/glom/utility_widgets/dialog_image_load_progress.h
+++ b/glom/utility_widgets/dialog_image_load_progress.h
@@ -43,7 +43,8 @@ public:
 
   void load(const Glib::ustring& uri);
 
-  std::unique_ptr<GdaBinary> get_image_data();
+  using UniquePtr = std::unique_ptr<GdaBinary, void(*)(GdaBinary*)>;
+  UniquePtr get_image_data();
 
 private:
   void error(const Glib::ustring& error_message);
@@ -53,7 +54,7 @@ private:
   void on_stream_read(const Glib::RefPtr<Gio::AsyncResult>& result, unsigned int offset);
   void on_read_next(unsigned int at);
 
-  std::unique_ptr<GdaBinary> m_data;
+  UniquePtr m_data;
   Gtk::ProgressBar* m_progress_bar;
 
   Glib::RefPtr<Gio::File> m_file;
diff --git a/glom/utility_widgets/dialog_image_save_progress.cc 
b/glom/utility_widgets/dialog_image_save_progress.cc
index b4a5a70..9a8847a 100644
--- a/glom/utility_widgets/dialog_image_save_progress.cc
+++ b/glom/utility_widgets/dialog_image_save_progress.cc
@@ -55,10 +55,12 @@ void DialogImageSaveProgress::save(const Glib::ustring& uri)
 {
   g_assert(m_data);
 
-  if(m_data->data == nullptr)
+  const auto data = gda_binary_get_data(const_cast<GdaBinary*>(m_data));
+  if(!data)
     return;
 
-  if(m_data->binary_length == 0)
+  const auto data_len = gda_binary_get_size(const_cast<GdaBinary*>(m_data));
+  if(data_len == 0)
     return;
 
   m_file = Gio::File::create_for_uri(uri);
@@ -89,8 +91,8 @@ void DialogImageSaveProgress::save(const Glib::ustring& uri)
   //Write the data to the output uri
   try
   {
-    m_stream->write_async(m_data->data,
-      std::min<gsize>(CHUNK_SIZE, m_data->binary_length),
+    m_stream->write_async(data,
+      std::min<gsize>(CHUNK_SIZE, data_len),
       sigc::bind(sigc::mem_fun(*this, &DialogImageSaveProgress::on_stream_write), 0));
   }
   catch(const Gio::Error& ex)
@@ -109,10 +111,11 @@ void DialogImageSaveProgress::on_stream_write(const Glib::RefPtr<Gio::AsyncResul
     g_assert(size >= 0); // Would have thrown an exception otherwise
 
     // Set progress
-    m_progress_bar->set_fraction(static_cast<double>(offset + size) / m_data->binary_length);
+    const auto data_len = gda_binary_get_size(const_cast<GdaBinary*>(m_data));
+    m_progress_bar->set_fraction(static_cast<double>(offset + size) / data_len);
 
     // Write next chunk, if any
-    if(  static_cast<gssize>(offset + size) < static_cast<gssize>(m_data->binary_length))
+    if(  static_cast<gssize>(offset + size) < static_cast<gssize>(data_len))
       // Even if choose a priority lower than GDK_PRIORITY_REDRAW + 10 for the
       // write_async we don't see the progressbar progressing while the image
       // is loading. Therefore we put an idle inbetween.
@@ -140,14 +143,17 @@ void DialogImageSaveProgress::error(const Glib::ustring& error_message)
 
 void DialogImageSaveProgress::on_write_next(unsigned int at)
 {
-  g_assert(at < static_cast<gsize>(m_data->binary_length));
+  const auto data_len = gda_binary_get_size(const_cast<GdaBinary*>(m_data));
+  g_assert(at < static_cast<gsize>(data_len));
 
-  m_stream->write_async(m_data->data + at, std::min<gsize>(CHUNK_SIZE, m_data->binary_length - at), 
sigc::bind(sigc::mem_fun(*this, &DialogImageSaveProgress::on_stream_write), at));
+  const auto data = gda_binary_get_data(const_cast<GdaBinary*>(m_data));
+  m_stream->write_async(static_cast<const guchar*>(data) + at, std::min<gsize>(CHUNK_SIZE, data_len - at),
+    sigc::bind(sigc::mem_fun(*this, &DialogImageSaveProgress::on_stream_write), at));
 }
 
-void DialogImageSaveProgress::set_image_data(const GdaBinary& data)
+void DialogImageSaveProgress::set_image_data(const GdaBinary* data)
 {
-  m_data = &data;
+  m_data = data;
 }
 
 } // namespace Glom
diff --git a/glom/utility_widgets/dialog_image_save_progress.h 
b/glom/utility_widgets/dialog_image_save_progress.h
index f3d5d24..1d552f4 100644
--- a/glom/utility_widgets/dialog_image_save_progress.h
+++ b/glom/utility_widgets/dialog_image_save_progress.h
@@ -41,7 +41,7 @@ public:
 
   void save(const Glib::ustring& uri);
 
-  void set_image_data(const GdaBinary& data);
+  void set_image_data(const GdaBinary* data);
 
 private:
   void on_stream_write(const Glib::RefPtr<Gio::AsyncResult>& result, unsigned int offset);
diff --git a/glom/utils_ui.cc b/glom/utils_ui.cc
index de179d8..e0ce9d8 100644
--- a/glom/utils_ui.cc
+++ b/glom/utils_ui.cc
@@ -234,10 +234,15 @@ Glib::RefPtr<Gdk::Pixbuf> UiUtils::get_pixbuf_for_gda_value(const Gnome::Gda::Va
     if(value.get_value_type() == GDA_TYPE_BLOB)
     {
       const auto blob = value.get_blob();
-      if(gda_blob_op_read_all(blob->op, const_cast<GdaBlob*>(blob)))
+      const auto op = blob ? gda_blob_get_op(const_cast<GdaBlob*>(blob)) : nullptr;
+      if(op && gda_blob_op_read_all(op, const_cast<GdaBlob*>(blob)))
       {
-        buffer_binary_length = blob->data.binary_length;
-        buffer_binary = blob->data.data;
+        const auto binary = gda_blob_get_binary(const_cast<GdaBlob*>(blob));
+        if (binary)
+        {
+          buffer_binary_length = gda_binary_get_size(binary);
+          buffer_binary = gda_binary_get_data(binary);
+        }
       }
       else
       {