What hash? Okio has some of those built in

# squarelibraries

[jw]

What hash? Okio has some of those built in

[spierce7]

I know that the jvm has the CipherSource and a DigestSource (I think). I didn’t see any of that on multiplatform though.

I’m just getting MD5 checksums.

[spierce7]

Did I miss something available in the okio api?

[jw]

https://github.com/square/okio/blob/895e0b9227640097916f1200aae740b3ce6713a2/okio/src/commonMain/kotlin/okio/ByteString.kt#L60-L79

[jw]

There's also a HashingSink into which you can send the file's contents

[spierce7]

You are right! I didn’t know that.

[spierce7]

I can’t use ByteString because the files are potentially very large, and I can’t load the entire file into memory.

I want to read a file contents and get the hash. What can I use as the Sink when I don’t actually want to do anything with the data? Is there a NoOpSink or an EmptySink?

[jw]

There's a blackhole sink, yes. I think it's a top-level factory method

[spierce7]

oh - what the heck. I definitely looked for this earlier. I just found HashingSource in the common layer too.

[spierce7]

Maybe my IDE glitched and didn’t give me proper completion while I was looking for these. Either way - I’m glad okio provides these in a multiplatform way. It’s far more convenient.