Re: HMACs of files

On Sat, May 20, 2023 at 4:45 PM Jeffrey Walton <[email protected]> wrote:
>
> On Sat, May 20, 2023 at 3:00 PM Tom <[email protected]> wrote:
> >
> > calling `FileSource fs("zero.dat", true);` seems to allocate the memory.
>
> Try the overload which takes a std::istream reference:
> https://www.cryptopp.com/wiki/FileSource

I took another look... The issue is you passed 'true' for 'pumpAll'.
That reads the entire file, and puts it in an output buffer for the
next filter.

Use 'false' instead, and then call 'PumpAll()' manually. Something
like the example. Something like this should suffice:

    FileSource fs("zero.dat", false, new Filter(..., new Sink(...)));
    fs.PumpAll();

It should pump in 4k blocks.

Jeff

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