Mark OLESEN authored Aug 29, 2023 and Andrew Heather committed Sep 01, 2023

- use ignore instead of seekg/tellg to swallow input (robuster)

- check for bad gcount() values

- wrap Foam::fileSize() compressed/uncompressed handling into IFstream.

- improve handling of compressed files in masterUncollatedFileOperation.
  Previously read into a string via stream iterators.
  Now read chunk-wise into a List of char for fewer reallocations.