Merge RFC4 (#1865)

This commit is the result of the squashing of rfc4_dev branch in a single
commit. It implements mostly RFC 4 related work.

* Grid handling:
  - remove obsolete and presumably unfinished implementation of grid catalog functionality
  - all grid functionality is in grids.cpp/.hpp
  - vertical and horizontal grid shift: rework to no longer load whole grid into memory
  - remove hgrids and vgrids member from PJ structure, and store them in hgridshift/vgridshift/deformation structures
  - build systems: add optional libtiff dependency. Must be explicitly disabled if not desired
  - add support for horizontal and vertical grids in GeoTIFF, if libtiff is available
  - add GenericShiftGridSet and GenericShiftGrid classes, relying on TIFF grids, that can be used for generic purpose grid-based adjustment
  - add a +proj=xyzgridshift method to perform geocentric translation by grid. Used for French NTF to RGF93 transformation using gr3df97a.tif grid
  - deformation: add support for +grids= for GeoTIFF grids
  - horizontal grid shift: fix failures on points slightly outside a subgrid (fixes #209)

* File management:
  - add a filemanager.cpp/.hpp to deal with file related work
  - test for legacy proj_api.h fileapi
  - proj.h: add proj_context_set_fileapi() and proj_context_set_sqlite3_vfs_name() (fixes #866)
  - add capability to read resource files from the user writable directory

* Network access:
  - build systems: add optional curl dependency
  - add a curl-based default implementation for network related functionality
  - proj.h: add C API to control network functionality, and optionaly provide network callbacks
  - add data/proj.ini with default settings
  - add a SQLite3 local cache of downloaded chunks
  - add proj_is_download_needed() and proj_download_file()

* Use Win32 Unicode APIs and expect all strings to be UTF-8 (fixes #1765)
  For backward compatibility, if PROJ_LIB content is found to be not UTF-8 or
  pointing to a non existing directory, then an attempt at interpretating it
  in the ANSI page encoding is done.
  proj_context_set_search_paths() now assumes strings to be in UTF-8, and
  functions returning paths will also return values in UTF-8.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/malloc.cpp b/src/malloc.cpp
index 393437e3..9ac28546 100644
--- a/src/malloc.cpp
+++ b/src/malloc.cpp
@@ -48,6 +48,10 @@
 
 #include "proj.h"
 #include "proj_internal.h"
+#include "grids.hpp"
+#include "filemanager.hpp"
+
+using namespace NS_PROJ;
 
 /**********************************************************************/
 void *pj_malloc(size_t size) {
@@ -225,10 +229,8 @@ PJ *pj_default_destructor (PJ *P, int errlev) {   /* Destructor */
     pj_dealloc(P->def_spherification);
     pj_dealloc(P->def_ellps);
 
-    /* free grid lists */
-    pj_dealloc( P->gridlist );
-    pj_dealloc( P->vgridlist_geoid );
-    pj_dealloc( P->catalog_name );
+    delete static_cast<ListOfHGrids*>(P->hgrids_legacy);
+    delete static_cast<ListOfVGrids*>(P->vgrids_legacy);
 
     /* We used to call pj_dalloc( P->catalog ), but this will leak */
     /* memory. The safe way to clear catalog and grid is to call */
@@ -261,4 +263,5 @@ void proj_cleanup() {
 /*****************************************************************************/
   pj_clear_initcache();
   pj_deallocate_grids();
+  FileManager::clearMemoryCache();
 }