starred/sharpcompress
1
0
Fork 0
mirror of https://github.com/adamhathcock/sharpcompress.git synced 2026-02-03 21:23:38 +00:00
Code Issues 975 Packages Projects Releases 20 Wiki Activity

Question : Find number of entries in the commpressed file #281

New Issue
Closed
opened 2026-01-29 22:09:28 +00:00 by claunia · 2 comments
claunia commented 2026-01-29 22:09:28 +00:00
Owner
Copy Link

Originally created by @trDiablo on GitHub (Mar 4, 2018).

Hello,

Is it possible to know the number of entry in a Zip file without reading and count all entrie ?

Currently i use

int nb = 0;
while (reader.MoveToNextEntry())
{
   if (!reader.Entry.IsDirectory) nb++;
}

but i have a performance issue about 3 or 4 second to a Zip file of 98Mb with 52 entries in it.
I probably missed a documentation but I did not find how to do.

Thx for your help

Originally created by @trDiablo on GitHub (Mar 4, 2018). Hello, Is it possible to know the number of entry in a Zip file without reading and count all entrie ? Currently i use ``` int nb = 0; while (reader.MoveToNextEntry()) { if (!reader.Entry.IsDirectory) nb++; } ``` but i have a performance issue about 3 or 4 second to a Zip file of 98Mb with 52 entries in it. I probably missed a documentation but I did not find how to do. Thx for your help
claunia commented 2026-01-29 22:09:29 +00:00
Author
Owner
Copy Link

@xupefei commented on GitHub (Mar 4, 2018):

Use ArchiveFactory whenever possible. It a lot faster than ReaderFactory.

I say "whenever" because there are some formats which ArchiveFactory does not handle well. For example, for a.tar.gz, ArchiveFactory returns only single file, which is a.gz. By contrast, ReaderFactory enumerates all files inside.

@xupefei commented on GitHub (Mar 4, 2018): Use `ArchiveFactory` whenever possible. It a lot faster than `ReaderFactory`. I say "whenever" because there are some formats which `ArchiveFactory` does not handle well. For example, for `a.tar.gz`, `ArchiveFactory` returns only single file, which is `a.gz`. By contrast, `ReaderFactory` enumerates all files inside.
claunia commented 2026-01-29 22:09:29 +00:00
Author
Owner
Copy Link

@trDiablo commented on GitHub (Mar 4, 2018):

Thx i have now the entry easily :)

For perfomances issues, i have same time with ReaderFactory or ArchiveFactory, decoding the whole file take 5 or 6 secondes (98 Mo, for 52 jpg entry).

I check my code to find if, and how, I can defer loading.

Thx

@trDiablo commented on GitHub (Mar 4, 2018): Thx i have now the entry easily :) For perfomances issues, i have same time with ReaderFactory or ArchiveFactory, decoding the whole file take 5 or 6 secondes (98 Mo, for 52 jpg entry). I check my code to find if, and how, I can defer loading. Thx
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
bug
duplicate
enhancement
feedback requested
not bug
pull-request
Mirrored from GitHub Pull Request
 question
up for grabs
wontfix
No Label
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
claunia
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: starred/sharpcompress#281
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?