How to zip huge files in a blob using stream

Question

I'm using Azure with blob storage ans Azure Functions. I got a lot of files and sometimes I want to generate a zip, save it in the storage and generate a link.

As my zip can be big (1 or 2 Go) I would like to do this "on the fly", meaning without using all the memory before save it:

stream on a zipentry
write to the blob
flush the stream
create next zipentry

I know I must use the method PutBlock() in the container, but I'm missing the code between ICSharpZipLib and BlobContainer.

Has someone an idea about it ?

This case may be helpful to you:stackoverflow.com/questions/18852389/… — Sa Yang
– Sa Yang, Commented Oct 6, 2017 at 8:36
Thanks. I'd seen this question, but I was hoping some other technique exists like writing in a zip stream would write a blob stream (don't know if i'm clear with the concept) — Mescal
– Mescal, Commented Oct 9, 2017 at 7:38

Mescal · Accepted Answer · 2017-11-03 15:18:49Z

4

Well, if I look more attentively at the documentation, I would have seen the method

blob.OpenWrite()

which returns a stream :

using (ZipOutputStream zipStream = new ZipOutputStream(blob.OpenWrite()))

Then I did as usual.

answered Nov 3, 2017 at 15:18

Mescal

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lukejkw Over a year ago

Are you able to post all the code? Struggling with an implementation at the moment but I'm already using blob write steam as input to zip output stream

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