fix(GooString): use std::string::size

Required for poppler rebase to 26.01.0

Reference: https://gitlab.freedesktop.org/poppler/poppler/-/commit/f6dcd06445b6b7795b4c8f654206c5aef3d79100

Co-authored-by: Alessandro Astone <alessandro.astone@canonical.com>

Author: sanjayankur31

Applications/Cxx/CMakeLists.txt

@@ -122,6 +122,12 @@ if(GDCM_USE_SYSTEM_POPPLER)
   if(LIBPOPPLER_PDFDOC_HAS_OPTIONAL)
     list(APPEND libpoppler_flags -DLIBPOPPLER_PDFDOC_HAS_OPTIONAL)
   endif()
+  CHECK_CXX_SOURCE_COMPILES(
+    "\#include <poppler/goo/GooString.h>\nint main() { GooString gs; gs.size(); return 0; }"
+    LIBPOPPLER_GOOSTRING_HAS_SIZE)
+  if(LIBPOPPLER_GOOSTRING_HAS_SIZE)
+    list(APPEND libpoppler_flags -DLIBPOPPLER_GOOSTRING_HAS_SIZE)
+  endif()
   if(libpoppler_flags)
     string(REPLACE ";" " " libpoppler_flags_string "${libpoppler_flags}")
     set_source_files_properties(

Applications/Cxx/gdcminfo.cxx

@@ -297,7 +297,11 @@ static std::string getInfoString(Dict *infoDict, const char *key, UnicodeMap *uM
       isUnicode = false;
       i = 0;
       }
+#ifdef LIBPOPPLER_GOOSTRING_HAS_SIZE
+    while (i < obj.getString()->size())
+#else
     while (i < obj.getString()->getLength())
+#endif
       {
       if (isUnicode)
         {

Applications/Cxx/gdcmpdf.cxx

@@ -148,7 +148,11 @@ static std::string getInfoString(Dict *infoDict, const char *key, UnicodeMap *uM
       isUnicode = false;
       i = 0;
       }
+#ifdef LIBPOPPLER_GOOSTRING_HAS_SIZE
+    while (i < obj.getString()->size())
+#else
     while (i < obj.getString()->getLength())
+#endif
       {
       if (isUnicode)
         {