[delphizip] Max ZIP file size
- From: "Sampath N" <sampath_n@xxxxxxxx>
- To: <delphizip@xxxxxxxxxxxxx>
- Date: Thu, 28 Mar 2002 22:13:06 +0530
Hi all,
I was trying to find the max size of the ZIP file that DelZip could create.
I did some tests with big zipping operations. To reduce testing time I mostly
used less compression levels. In the tests, I found that for some zipping
operations(I think when SizeToBeCompressed is huge), the progressbar(total
progress) didn't correctly displayed(it was either at 0% or at 100% at any
time).
I did the following tests:
(ZipDLL used: Version 1.6.0.17 DelZip used: Version 1.6N OS used:
WinXP,Win2000)
Test
No. No. of files
compressed Compress
Level Correct
Progressbar ZIP file size Result Size to be
compressed
1 8774 0 Yes 1.17 GB Success 1.17 GB
2 8774 2 Yes 615 MB Success 1.17 GB
3 13815 1 No 1.76 GB Success 2.63 GB
4 13815 6 No 1.72 GB Success 2.63 GB
5 215 1 Yes 969 MB Success 985 MB
6 14676 1 No - Failure 3.4 GB
7 14676 0 No - Failure 3.4 GB
8 6844 1 Yes 292 MB Success 673 MB
9 7832 0 No - Failure 2.74 GB
10 14519 1 No 1.81 GB Success 2.73 GB
11 17406 1 No - Failure 4.1 GB
12 17087 1 No - Failure 3.9 GB
13 17064 1 No 1.9 GB Success 2.9 GB
14 17064 0 No - Failure 2.9 GB
Success: ZIP file created.
Failure: Aborted with "Error reading a file"
(I think the aborting took place when the processed size exceeded 2 GB)
From the above tests,
My understanding is that the max size of ZIP file possible with DelZip is 2 GB
(refer TestNo 13,14).
It also indicates(refer TestNo 3,4) that a higher compression level doesn't
give much improvement. (But it may vary depending on the file types compressed,
I am not sure about that)
I guess this has helped.
Regards,
Sampath
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