v1.0.0-rc.34

writer/HDF5Objects.cpp

@@ -643,4 +643,41 @@ std::vector<std::string> HDF5Object::FindLeafs(const std::string &name) const {
 
     H5Gclose(gid);
     return ret;
-}
+}
+
+std::string HDF5Object::GetLinkedFileName(const std::string& name) const {
+    H5L_info2_t link_info;
+
+    // Get information about the link
+    if (H5Lget_info(id, name.c_str(), &link_info, H5P_DEFAULT) < 0)
+        throw JFJochException(JFJochExceptionCategory::HDF5,
+                              "Failed to retrieve information about the link");
+
+    if (link_info.type != H5L_TYPE_EXTERNAL)
+        throw JFJochException(JFJochExceptionCategory::HDF5,
+                              "This is not an external link");
+
+    std::vector<char> link_target(link_info.u.val_size + 2, '\0');
+    if (H5Lget_val(id,
+                   name.c_str(),
+                   link_target.data(),
+                   link_info.u.val_size + 1, H5P_DEFAULT) < 0)
+        throw JFJochException(JFJochExceptionCategory::HDF5,
+                              "Failed to get link location");
+
+    const char *target_file_name = nullptr;            // To store unpacked file name
+    const char *target_object_path = nullptr;          // To store unpacked object path
+
+    // Unpack the external link's value
+    if (H5Lunpack_elink_val(link_target.data(),
+                            link_info.u.val_size,
+                            nullptr,
+                            &target_file_name,
+                            &target_object_path) < 0)
+        throw JFJochException(JFJochExceptionCategory::HDF5,
+                              "Failed to get link location");
+
+    std::string s(target_file_name);
+
+    return s;
+}