Provide a hook to setup iconv path at runtime

oficonv/include/dcmtk/oficonv/iconv.h

@@ -309,6 +309,12 @@ DCMTK_OFICONV_EXPORT char *OFiconv_canonicalize(const char *name);
  */
 DCMTK_OFICONV_EXPORT int OFiconvctl(iconv_t cd, int request, void *argument);
 
+/** This function define a runtime path where to look for the oficonv db files.
+ * This path is used only after the env variable DCMICONVPATH.
+ * @param path to the location of esdb folder
+ */
+DCMTK_OFICONV_EXPORT void OFiconv_setpath(const char *iconv_path);
+
 /// space holder type for OFlocale_charset().
 typedef struct {
     char spaceholder[20];

oficonv/libsrc/citrus_bcs.c

@@ -25,12 +25,25 @@
  */
 
 #include "dcmtk/config/osconfig.h"
+#include "dcmtk/oficonv/iconv.h"
 #include "citrus_bcs.h"
 
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
+char *oficonv_path = NULL;
+
+void OFiconv_setpath(const char *runtime_path) {
+    if (oficonv_path) {
+        free(oficonv_path);
+        oficonv_path = NULL;
+    }
+    if (runtime_path) {
+        oficonv_path = strdup(runtime_path);
+    }
+}
+
 /*
  * case insensitive comparison between two C strings.
  */
@@ -184,6 +197,9 @@ void get_data_path(char *path_out, size_t path_size, const char *dirname, const
     // retrieve the DCMICONVPATH environment variable
     env = getenv(OFICONV_PATH_VARIABLE);
 
+    // if the environment variable is not set, use the runtime oficonv path instead:
+    if ( env == NULL && oficonv_path != NULL ) env = oficonv_path;
+
     // if the environment variable is not set, use DEFAULT_SUPPORT_DATA_DIR instead
     if (env == NULL) env = DEFAULT_SUPPORT_DATA_DIR;
 

oficonv/libsrc/oficonv_iconv.c

@@ -378,4 +378,5 @@ const char *OFlocale_charset(iconv_locale_allocation_t *buf)
 void OFiconv_cleanup()
 {
   _citrus_csmapper_free();
+  OFiconv_setpath(NULL);
 }