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I am creating zip files to be used with java 6, which does not support 64-bit zip files.
I am storing large collections of small images in a single uncompressed zip file.
10,000 to 1,000,000 images. Image file sizes are 1KB - 20KB. Resultant zip files up to 10GB.
If 32-bit compression fails, I can break up the files in other ways.
How does 7zip choose between 32-bit and 64-bit?
I am seeing odd results. One 800MB zip file used 64-bit, while another 1200MB file used 32-bit.
Is there any way to force 32-bit compression, then fail if impossible?
7-Zip uses ZIP64, if there are 65535 files or more.