[Haskell-cafe] Data.Conduit.Binary question

David Turner dct25-561bs at mythic-beasts.com
Sat Sep 3 17:49:27 UTC 2016

Hi Michael,

The sourceFile function reads the file in chunks and passes each chunk down
the conduit, although the sizes of the chunks are not specified. If that's
ok with you, you may be able to do something as simple as this:

    sourceFile inFile `fuse` accumulateMD5 `fuseUpstream` sinkFile outFile

where accumulateMD5 does the MD5 calculation.

If you need control over the sizes of the chunks, I'd add something else to
the pipeline between sourceFile and accumulateMD5 that sorts that out,
rather than using sourceFileRange which will open the file and seek to the
right place each time you call it.

Hope that helps,

On 3 September 2016 at 18:37, Michael Litchard <michael at schmong.org> wrote:

> I'd like to use conduits to (1) read a binary file in chunks
>                    (2) take an md5 of that chunk (3) write the chunk to a
> file
>                    (4) write md5 to file. I'm looking at
> Data.Conduit.Binary.
>                    Do I want sourceFileRange for (1)?
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