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, 83 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 715ce3a6..2abf5684 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,6 +20,8 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AM_PROG_LIBTOOL
 
+PKG_PROG_PKG_CONFIG
+
 dnl Enable as much warnings as possible
 AX_CFLAGS_WARN_ALL(C_WFLAGS)
 AX_CXXFLAGS_WARN_ALL(CXX_WFLAGS)
@@ -169,6 +171,15 @@ AC_SUBST(NO_ZERO_AS_NULL_POINTER_CONSTANT_FLAG,$NO_ZERO_AS_NULL_POINTER_CONSTANT
 CFLAGS="${CFLAGS} -fvisibility=hidden"
 CXXFLAGS="${CXXFLAGS} -fvisibility=hidden"
 
+case "${host_os}" in
+    cygwin* | mingw32* | pw32* | beos* | darwin*)
+        CFLAGS="${CFLAGS} -DNOMINMAX"
+        CXXFLAGS="${CXXFLAGS} -DNOMINMAX"
+        ;;
+    *)
+        ;;
+esac
+
 dnl Checks for libraries.
 save_CFLAGS="$CFLAGS"
 CFLAGS=`echo "$CFLAGS" | sed "s/-Werror/ /"`
@@ -241,6 +252,78 @@ if test x"$SQLITE3_CHECK" != x"yes" ; then
 fi
 
 dnl ---------------------------------------------------------------------------
+dnl Check for libtiff
+dnl ---------------------------------------------------------------------------
+
+AC_ARG_ENABLE([tiff-is-strongly-discouraged],
+              AS_HELP_STRING([--disable-tiff-is-strongly-discouraged],
+                    [Disable TIFF support. Strongly discouraged !]),
+              [enable_tiff=no],
+              [enable_tiff=yes])
+
+if test "x$enable_tiff" = "xyes" -o "x$enable_tiff" = ""; then
+    if test "x$TIFF_CFLAGS$TIFF_LIBS" = "x" ; then
+        if $PKG_CONFIG libtiff; then
+            PKG_CHECK_MODULES([TIFF], [libtiff])
+        else
+            PKG_CHECK_MODULES([TIFF], [libtiff-4])
+        fi
+    fi
+    TIFF_ENABLED_FLAGS=-DTIFF_ENABLED
+fi
+AC_SUBST(TIFF_CFLAGS,$TIFF_CFLAGS)
+AC_SUBST(TIFF_LIBS,$TIFF_LIBS)
+AC_SUBST(TIFF_ENABLED_FLAGS,$TIFF_ENABLED_FLAGS)
+
+dnl ---------------------------------------------------------------------------
+dnl Check for curl
+dnl ---------------------------------------------------------------------------
+
+FOUND_CURL=no
+CURL_CFLAGS=
+CURL_LIB=
+
+AC_ARG_WITH(curl,
+    [  --with-curl[=ARG]       Enable curl support (ARG=path to curl-config.)],,,)
+
+dnl Clear some cache variables
+unset ac_cv_path_LIBCURL
+
+if test "`basename xx/$with_curl`" = "curl-config" ; then
+  LIBCURL_CONFIG="$with_curl"
+elif test "$with_curl" = "no" ; then
+  LIBCURL_CONFIG=no
+else
+  AC_PATH_PROG(LIBCURL_CONFIG, curl-config, not-found)
+fi
+
+if test "$LIBCURL_CONFIG" = "not-found" ; then
+  AC_MSG_ERROR([curl not found. If wanting to do a build without curl support (and thus without built-in networking capability), explictly disable it with --without-curl])
+elif test "$LIBCURL_CONFIG" != "no" ; then
+
+  CURL_VERNUM=`$LIBCURL_CONFIG --vernum`
+  CURL_VER=`$LIBCURL_CONFIG --version | awk '{print $2}'`
+
+  AC_MSG_RESULT([        found libcurl version $CURL_VER])
+
+  AC_CHECK_LIB(curl,curl_global_init,FOUND_CURL=yes,FOUND_CURL=no,`$LIBCURL_CONFIG --libs`)
+
+  if test "$FOUND_CURL" = "no" ; then
+    AC_MSG_ERROR([curl not found. If wanting to do a build without curl support (and thus without built-in networking capability), explictly disable it with --without-curl])
+  fi
+  CURL_ENABLED_FLAGS=-DCURL_ENABLED
+fi
+
+if test "$FOUND_CURL" = "yes" ; then
+  CURL_CFLAGS=`$LIBCURL_CONFIG --cflags`
+  CURL_LIBS=`$LIBCURL_CONFIG --libs`
+fi
+
+AC_SUBST(CURL_CFLAGS,$CURL_CFLAGS)
+AC_SUBST(CURL_LIBS,$CURL_LIBS)
+AC_SUBST(CURL_ENABLED_FLAGS,$CURL_ENABLED_FLAGS)
+
+dnl ---------------------------------------------------------------------------
 dnl Check for external Google Test
 dnl ---------------------------------------------------------------------------