some missing query function implemented, see issue#1 in Gitlab

src/include/H5Part_io.h

@@ -88,6 +88,9 @@ H5PartGetDatasetName (
 
   \return \c H5_SUCCESS on success
   \return \c H5_FAILURE on error
+
+  \see H5PartGetNumDatasets()
+  \see H5PartGetDatasetInfoByName()
 */
 static inline h5_err_t
 H5PartGetDatasetInfo (
@@ -110,6 +113,58 @@ H5PartGetDatasetInfo (
 	H5_API_RETURN (h5u_get_dataset_info (
 			       f, idx, name, len_name, type, nelems));
 }
+/**
+  Determines whether a dataset with given name exists in current step.
+
+  \return      true (value \c >0) if step exists
+  \return      false (\c 0) if step does not exist
+  \return      \c H5_FAILURE on error
+*/
+static inline h5_err_t
+H5PartHasDataset (
+	const h5_file_t f,           	///< [in]  file handle
+	const char* const name         	///< [in]  name of dataset
+	) {
+	H5_API_ENTER (h5_int64_t, 
+		      "f=%p, name='%s'",
+		      (h5_file_p)f, name);
+	H5_API_RETURN (h5u_has_dataset (f, name));
+}
+
+/**
+  Gets the type and number of elements of a dataset based on its
+  name in the current timestep.
+
+  Type is one of the following values:
+
+  - \c H5_FLOAT64_T (for \c h5_float64_t)
+  - \c H5_FLOAT32_T (for \c h5_float32_t)
+  - \c H5_INT64_T (for \c h5_int64_t)
+  - \c H5_INT32_T (for \c h5_int32_t)
+
+  \return \c H5_SUCCESS on success
+  \return \c H5_FAILURE on error
+
+  \see H5PartHasDataset()
+  \see H5PartGetDatasetInfo()
+*/
+static inline h5_err_t
+H5PartGetDatasetInfoByName (
+	const h5_file_t f,           	///< [in]  file handle
+	const char* const name,         ///< [in]  name of dataset
+	h5_int64_t* type,       	///< [out] type of data in dataset
+	h5_size_t* nelems        	///< [out] number of elements
+	) {
+	H5_API_ENTER (h5_int64_t, 
+		      "f=%p, "
+		      "name='%s', "
+		      "type=%p, nelems=%p",
+		      (h5_file_p)f,
+		      name,
+		      type, nelems);
+	H5_API_RETURN (h5u_get_dataset_info_by_name (
+			       f, name, type, nelems));
+}
 
 /**
   This function returns the number of particles in this processor's view,

src/include/H5_model.h

@@ -235,6 +235,24 @@ H5GetAttachmentInfoByIdx (
 			       f, idx, fname, len_fname, fsize));
 }
 
+/**
+  Query whether a particular attachment exists in the file.
+
+  \return      true (value \c >0) if attachment exists
+  \return      false (\c 0) if attachment does not exist
+  \return      \c H5_FAILURE on error
+*/
+static inline h5_err_t
+H5HasAttachment (
+	const h5_file_t f,              ///< [in]  file handle.
+	const char* const fname		///< [in]  original file name.
+	) {
+	H5_API_ENTER (h5_err_t,
+                      "f=%p, name='%s'",
+                      (h5_file_p)f, fname);
+	H5_API_RETURN (h5_has_attachment (f, fname));
+}
+
 /**
   Get size of attached file with name \c fname.
 

src/include/h5core/h5_model.h

@@ -26,6 +26,14 @@ h5_err_t
 h5_add_attachment (
 	const h5_file_t, const char* const);
 
+h5_err_t
+h5_has_attachments (
+	const h5_file_t);
+
+h5_err_t
+h5_has_attachment (
+	const h5_file_t, const char* const);
+	
 h5_ssize_t
 h5_get_num_attachments (
 	const h5_file_t);

src/include/h5core/h5_types.h

@@ -142,6 +142,17 @@ typedef struct h5_glb_idxlist {
 	h5_glb_idx_t items[1];
 } h5_glb_idxlist_t;
 
+enum h5_iterators {
+	step_iterator
+};
+
+struct h5_iterator;
+typedef struct {
+	enum h5_iterators it_type;
+	h5_file_t file;
+	h5_int64_t (*iter)(struct h5_iterator*);
+} h5_iterator_t;
+
 struct h5_idxmap;
 typedef struct h5_idxmap h5_idxmap_t;
 

src/include/h5core/h5u_model.h

@@ -75,9 +75,15 @@ h5u_get_dataset_info (
 	const h5_id_t, char* const, const h5_size_t, h5_int64_t* const,
         h5_size_t* const);
 
+h5_err_t
+h5u_has_dataset (
+	const h5_file_t fh,
+	const char* const name
+	);
+
 h5_err_t
 h5u_get_dataset_info_by_name (
-        const h5_file_p f,
+        const h5_file_t f,
         const char* const dataset_name,
         h5_int64_t* const type,
         h5_size_t* const nelem