How to set compression method?

[LSDsl]

How to set compression Store (no compression)?

[toomasr]

There are couple of methods that accept the compression level in ZipUtil. See public static void pack(File sourceDir, File targetZip, NameMapper mapper, int compressionLevel) for example. The compression level comes from zip.util.Deflater class. You are looking for Deflater.NO_COMPRESSION.

[LSDsl]

Deflater with NO_COMPRESSION not same as Store. That is in ZipOutputStream.setMethod(STORED) STORED

[toomasr]

I'm quite confused about the difference of levels in ZipOutputStream and Deflater. There is some information at https://stackoverflow.com/questions/1206970/how-to-create-uncompressed-zip-archive-in-java/

Based on https://en.wikipedia.org/wiki/Zip_(file_format)#Compression_methods it might even be that they use the different name (STORE vs NO_COMPRESSION) for the same thing.

Are you getting any exceptions when you use NO_COMPRESSION and you actually wish to use STORED?

[LSDsl]

I need send zips to another software and it need STORE.
For example test- test file. store.zip- zip with STORE, no_compression.zip- DEFLATE with NO_COMPRESSION
store.zip
no_compression.zip
test.txt

U can see diffrenece in size. Also U can use WinRar to see info. For store.zip - it show 1.0/Store. For no_compression.zip it show 2.0/Deflate. So it has some differences.

[toomasr]

Understood. Yes, there isn't a way to accomplish this. I'll give this some thought how to get there. As I understand from the JavaDoc it seems that you need to specify STORED to the outputstream AND also to each entry with setMethod(STORED). I haven't tested it though.

I'll think about adding a somesort of a mapper to the pack method where users can tweak the entries.