The number of bytes used for "Page Bits" in Extensible Array Indexing Information

HDF5 Library
1

Does the “Page Bits” in Extensible Array Indexing Information really use two bytes?

PageBits_ExtensibleArray
PageBits_ExtensibleArray1606×922 203 KB

2

Thanks for the report @furutaka.kazuyoshi . If I look at the URL in your screenshot (https://support.hdfgroup.org/documentation/hdf5/latest/_f_m_t4.html#title22), I see something quite different

image
image2006×1204 370 KB

The extensible array index section looks like this:

image
image2006×1204 427 KB

Maybe you have a stale cached copy? Or maybe I do :thinking:

3

Thanks for your response.

I couldn’t find any direct link to the corresponding tables (so the url seen is not what I want to point to, sorry), and I did find the tables by looking for the string “Extensible Array Indexing Information” by searching for the string, “Extensible Array Indexing Information”, which are highlighted in the image I attached (there are only two in the manual)

4

You are correct. This is an error in the specification. The original RFC states on page 12 that the Extensible Array Indexing Information byte size is 5 (4+1). The source code shows the same picture. I’ll create a GitHub issue.

Thanks, G.

1 Like
5

For reference: Error in the file format specification: Incorrect 'Page Bits' field size in Extensible Array Indexing Information · Issue #6325 · HDFGroup/hdf5 · GitHub