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H5P_SET_LIBVER_BOUNDS

Controls the range of library release versions used when creating objects in a file

Procedure:

H5P_SET_LIBVER_BOUNDS ( fapl_id, low, high )

Signature:

herr_t H5Pset_libver_bounds(
            hid_t fapl_id,
            H5F_libver_t low,
            H5F_libver_t high
    )
  

Fortran90 Interface: h5pset_libver_bounds_f

SUBROUTINE h5pset_libver_bounds_f(fapl_id, low, high, hdferr)
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: fapl_id 
                             ! File access property list identifier
  INTEGER, INTENT(IN) :: low ! The earliest version of the library that 
                             ! will be used for writing objects.
                             ! Currently, low must be either:
                             !        H5F_LIBVER_EARLIEST_F
                             !        H5F_LIBVER_LATEST_F
  INTEGER, INTENT(IN) :: high 
                             ! The latest version of the library that will be 
                             ! used for writing objects.
                             ! Currently, high must set to:
                             !            H5F_LIBVER_LATEST_F
  INTEGER, INTENT(OUT) :: hdferr
                             ! Error code
                             ! 0 on success and -1 on failure
END SUBROUTINE h5pset_libver_bounds_f  
    

Parameters:
hid_t fapl_idIN: File access property list identifier
H5F_libver_t low    

IN: The earliest version of the library that will be used for writing objects

H5F_libver_t high    

IN: The latest version of the library that will be used for writing objects

Description:

H5P_SET_LIBVER_BOUNDS controls the range of library release versions that will be used when creating objects in a file.  The object format versions are determined indirectly from the library release versions specified in the call.

This property is set in the file access property list specified by the parameter fapl_id.

The parameter low sets the earliest possible format versions that the library will use when creating objects in the file.  Note that earliest possible is different from earliest, as some features introduced in library versions later than 1.0.0 resulted in updates to object formats.  The parameter high sets the latest format versions that the library will be allowed to use when creating objects in the file.

The parameters low and high must be one of the enumerated values in the H5F_libver_t struct, which is defined in H5Fpublic.h:

typedef enum H5F_libver_t {

H5F_LIBVER_EARLIEST,

H5F_LIBVER_V18 = 1,

H5F_LIBVER_V110 = 2,

H5F_LIBVER_NBOUNDS

} H5F_libvert_t;

#define H5F_LIBVER_LATEST      H5F_LIBVER_V110

The macro H5F_LIBVER_LATEST is aliased to the highest enumerated value in H5F_libver_t, indicating that this is currently the latest format available.

The library supports the following five pairs of (low, high) combinations as derived from the above values in H5F_libver_t:

 

Value of low and highResult

low=H5F_LIBVER_EARLIEST   

high=H5F_LIBVER_V18

  • The library will create objects with the earliest possible format versions. 
  • The library will allow objects to be created with the latest format versions available to library release 1.8.x. 
  • API calls that create objects or features that are available to versions of the library greater than 1.8.x release will fail.

low=H5F_LIBVER_EARLIEST

high=H5F_LIBVER_V110

  • The library will create objects with the earliest possible format versions. 
  • The library will allow objects to be created with the latest format versions available to library release 1.10.x.   Since 1.10.x is also H5F_LIBVER_LATEST, there is no upper limit on the format versions to use.  For example, if a newer format version is required to support a feature e.g. virtual dataset, this setting will allow the object to be created.
  • This is the library default setting and provides the greatest format compatibility.

low=H5F_LIBVER_V18

high=H5F_LIBVER_V18

  • The library will create objects with the latest format versions available to library release 1.8.x.
  • API calls that create objects or features that are available to versions of the library greater than 1.8.x release will fail.
  • Earlier versions of the library may not be able to access objects created with this setting.

low=H5F_LIBVER_V18

high=H5F_LIBVER_V110

  • The library will create objects with the latest format versions available to library release 1.8.x.
  • The library will allow objects to be created with the latest format versions available to library release 1.10.x.   Since 1.10.x is also H5F_LIBVER_LATEST, there is no upper limit on the format versions to use.  For example, if a newer format version is required to support a feature e.g. virtual dataset, this setting will allow the object to be created.
  • Earlier versions of the library may not be able to access objects created with this setting.

low=H5F_LIBVER_V110

high=H5F_LIBVER_V110

  • The library will create objects with the latest format versions available to library release 1.10.x.  
  • The library will allow objects to be created with the latest format versions available to library release 1.10.x.   Since 1.10.x is also H5F_LIBVER_LATEST, there is no upper limit on the format versions to use.  For example, if a newer format version is required to support a feature e.g. virtual dataset, this setting will allow the object to be created. 
  • This setting allows users to take advantage of the latest features and performance enhancements in the library.  However, objects written with this setting may be accessible to a smaller range of library versions than would be the case if low is set to H5F_LIBVER_EARLIEST.
  • Earlier versions of the library may not be able to access objects created with this setting.

Returns:

Returns a non-negative value if successful; otherwise returns a negative value.

Example:

/*

 *       Create a file with fapl setting (H5F_LIBVER_V18, H5F_LIBVER_LATEST).

 *       Create a chunked dataset in the file with “no filter edge chunks”, which

  *      is introduced in library release 1.10.

  */

/* Create a file access property list */

fapl = H5Pcreate(H5P_FILE_ACCESS);

/* Set the fapl */

H5Pset_libver_bounds(fapl, H5F_LIBVER_V18, H5F_LIBVER_LATEST);

/* Create a file with this fapl */

fid = H5Fcreate(FILE8, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);

/* Set up to create a chunked dataset with “no filter edge chunks” enabled */

sid = H5Screate_simple(2, fix_dims2, NULL);

dcpl = H5Pcreate(H5P_DATASET_CREATE);

H5Pset_chunk(dcpl, 2, fix_chunks2);

H5Pset_chunk_opts(dcpl, H5D_CHUNK_DONT_FILTER_PARTIAL_CHUNKS);

/* Should succeed in creating this dataset */

did = H5Dcreate2(fid, “DSETA”, H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);

/*

 * If you create the file with fapl setting (H5F_LIBVER_EARLIEST, H5F_LIBVER_V18),

 *  the creation of the same dataset will fail.

 */

:

:

:

 

History:
Release    C
1.10.2

Add H5F_LIBVER_V18 to the enumerated defines in H5F_libver_t.

1.8.0Function introduced in this release.

--- Last Modified: March 22, 2018 | 11:44 AM