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!************************************************************
!
! This example shows how to create "compact-or-indexed"
! format groups, new to 1.8. This example also illustrates
! the space savings of compact groups by creating 2 files
! which are identical except for the group format, and
! displaying the file size of each. Both files have one
! empty group in the root group.
!
! This file is intended for use with HDF5 Library version 1.8
!
!************************************************************
PROGRAM main
USE HDF5
IMPLICIT NONE
CHARACTER(LEN=18), PARAMETER :: filename1 = "h5ex_g_compact1.h5"
CHARACTER(LEN=18), PARAMETER :: filename2 = "h5ex_g_compact2.h5"
CHARACTER(LEN=2) , PARAMETER :: groupname = "G1"
INTEGER(HID_T) :: file, group, fapl ! handles
INTEGER :: hdferr
INTEGER :: storage_type ! Type of storage for links in group:
! H5G_STORAGE_TYPE_COMPACT: Compact storage
! H5G_STORAGE_TYPE_DENSE: Indexed storage
! H5G_STORAGE_TYPE_SYMBOL_TABLE: Symbol tables
INTEGER :: nlinks ! Number of links in group
INTEGER :: max_corder ! Current maximum creation order value for group
INTEGER(HSIZE_T) :: size
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
!
! Create file 1. This file will use original format groups.
!
CALL h5fcreate_f(filename1, H5F_ACC_TRUNC_F, file, hdferr)
CALL h5gcreate_f(file, groupname, group, hdferr)
!
! Obtain the group info and print the group storage type.
!
CALL H5Gget_info_f(group, storage_type, nlinks, max_corder, hdferr)
WRITE(*,'("Group storage type for ",A," is: ")', ADVANCE='NO' ) filename1
IF(storage_type.EQ.H5G_STORAGE_TYPE_COMPACT_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_COMPACT_F")') ! New compact format
ELSE IF(storage_type.EQ.H5G_STORAGE_TYPE_DENSE_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_DENSE_F")') ! New dense (indexed) format
ELSE IF(storage_type.EQ.H5G_STORAGE_TYPE_SYMBOL_TABLE_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_SYMBOL_TABLE_F")') ! Original format
ENDIF
!
! Close and re-open file. Needed to get the correct file size.
!
CALL h5gclose_f(group, hdferr)
CALL h5fclose_f(file , hdferr)
CALL h5fopen_f(filename1, H5F_ACC_RDONLY_F, file, hdferr)
!
! Obtain and print the file size.
!
CALL h5fget_filesize_f(file, size, hdferr)
WRITE(*,'("File size for ",A," is: ",i6," bytes",/)') filename1, size
!
! Close filename1
!
CALL h5fclose_f(file, hdferr)
!
! Set file access property list to allow the latest file format.
! This will allow the library to create new compact format groups.
!
CALL h5pcreate_f (H5P_FILE_ACCESS_F, fapl, hdferr)
CALL h5pset_libver_bounds_f (fapl, H5F_LIBVER_LATEST_F, H5F_LIBVER_LATEST_F, hdferr)
!
! Create file 2 using the new file access property list.
!
CALL h5fcreate_f(filename2, H5F_ACC_TRUNC_F, file, hdferr, access_prp=fapl)
CALL h5gcreate_f(file, groupname, group, hdferr)
!
! Obtain the group info and print the group storage type.
!
CALL H5Gget_info_f(group, storage_type, nlinks, max_corder, hdferr)
WRITE(*,'("Group storage type for ",A," is: ")', ADVANCE='NO' ) filename2
IF(storage_type.EQ.H5G_STORAGE_TYPE_COMPACT_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_COMPACT_F")') ! New compact format
ELSE IF(storage_type.EQ.H5G_STORAGE_TYPE_DENSE_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_DENSE_F")') ! New dense (indexed) format
ELSE IF(storage_type.EQ.H5G_STORAGE_TYPE_SYMBOL_TABLE_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_SYMBOL_TABLE_F")') ! Original format
ELSE IF(storage_type.EQ.H5G_STORAGE_TYPE_UNKNOWN_F)THEN
WRITE(*,'("H5G_STORAGE_TYPE_UNKNOWN_F")') ! Unknown format
ENDIF
!
! Close and re-open file. Needed to get the correct file size.
!
CALL h5gclose_f(group, hdferr)
CALL h5fclose_f(file , hdferr)
CALL h5fopen_f(filename2, H5F_ACC_RDONLY_F, file, hdferr, fapl)
!
! Obtain and print the file size.
!
CALL h5fget_filesize_f(file, size, hdferr)
WRITE(*,'("File size for ",A," is: ",i6,"bytes",/)') filename2, size
!
! Close and release resources.
!
CALL h5pclose_f(fapl, hdferr)
CALL h5fclose_f(file, hdferr)
END PROGRAM main
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