io61 is the implementation of a subset of stdio functions I wrote
for CS61. io61 implements fseek, fread, fwrite, freadc,
and fwritec using memory-mapped IO or a single-slot cache,
depending on the file type. It is a correct implementation and
passes a number of difficult tests found in /tests. It is also
a fast implementation, outperforming stdio by an average factor
of 9.38x across 45 tests of various access patterns and payload
sizes.
I wrote all
the code in io61.cc and io61.hh except the small setup functions
at the end of io61.cc.