can't find H5DOread_chunk function in source

hi~ i am reading source for chunk copy.
i found H5DOwrite_chunk and H5DOappend ,
but i couldn’t find H5DOread_chunk function in H5DO.c file.

follow link list 3 function : https://support.hdfgroup.org/HDF5/doc/HL/RM_HDF5Optimized.html

can you help me?

H5DOread_chunk will be available in the upcoming 1.10.2 release; if you need it now then you can download the source from:

https://bitbucket.hdfgroup.org/projects/HDFFV/repos/hdf5/browse?at=refs%2Fheads%2Fhdf5_1_10_2