MartinElvar
I’m trying to decompress a zstd compressed file using the Elixir, and the library GitHub - chenzhuoyu/elixir-zstd: Elixir binding of the Zstandard library · GitHub
I’ve tried the following
{:ok, content} = File.read("myfile")
<<header :: binary-size(12), remainder :: binary>> = content
{:ok, orig} = ExZstd.simple_decompress(remainder)
-> ** (MatchError) no match of right hand side value: {:error, 'Unable to determain decompressed size'}
There er no problems when running the zstd command from the terminal.
I’ve also trying the streaming solution, found in the test example.
https://github.com/chenzhuoyu/elixir-zstd/blob/master/test/ex_zstd_test.exs
But i fail to see how i get the tail, when the data is from a file, and not a compression stream.
Any who can help me out, or should i simply resort to calling the zstd command directly from my code.
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sribe
I don’t know this library, but I bet you need to pass the whole file contents in rather than discarding the header.
MartinElvar
That is a header that we manually put in, in the the (rust) program that actually produces the file.
It only works in the terminal, if i remove the header we wrap it in.
OvermindDL1
Well with that error it’s failing on line:
https://github.com/chenzhuoyu/elixir-zstd/blob/b0f045b0d195f116eee317701ee4517bf16ebf57/c_src/nif_ex_zstd.c#L476
Are you sure it is an actual zstd file? Have you tried writing out the file and skipping the header to a file and using the zstd program at that point?
sribe
Ah, ok
MartinElvar
Yes, i’ve have tried writing
remainderto a file, and then decompress it withzstd -d myfile.zstno problem. Maybe it’s version mismatch.OvermindDL1
It’s possible, it doesn’t look like that library links a built in zstd library but rather just whatever is available on the system. Maybe try a little hoist program to confirm that, like python with ffi for a quick link and test or so?