Fixed: Not able to upload 512MB+ custom apps anymore.

[MohitMaliFtechiz]

Fixes #3511

• Introduced the splitting zim file with 500MB for custom apps. Since the bundle has a limit for a file to upload it uses the play asset delivery mode, and for new custom apps, playStore does not allow to upload the apk (with apk we can upload more than 1GB file). So to address this issue we have introduced a feature in libzim where we can load the zim files via the fd list.
• We have modified our code to upload the files with 500MB chunks in the asset folder, and later we are accessing these files from the asset folder and creating the archive object with the help of the new libzim feature.
• Currently CI will fail because we are using the new libzim feature in this PR. But currently new binding of java-libkiwix is not released once the new binding is released and we start using that then this error will resolve.

[kelson42]

@MohitMaliFtechiz Thx for rhis PR, but its important to notice that we won't be able to put more than 3 chunks=1.5GB as asset. It does not fully fix the problem AFAIK

[MohitMaliFtechiz]

@kelson42 We have a total combined limit of 1GB for install-time that we are currently using, above this, we still have the problem.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 53.53%. Comparing base (d099876) to head (14b782a).

Files	Patch %	Lines
...org/kiwix/kiwixmobile/core/reader/ZimFileReader.kt	8.33%	11 Missing ⚠️
.../kiwix/kiwixmobile/core/main/CoreReaderFragment.kt	33.33%	3 Missing and 1 partial ⚠️
...iwix/kiwixmobile/core/reader/ZimReaderContainer.kt	0.00%	3 Missing ⚠️
...rg/kiwix/kiwixmobile/core/webserver/KiwixServer.kt	0.00%	2 Missing ⚠️
...bile/nav/destination/reader/KiwixReaderFragment.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3801      +/-   ##
============================================
- Coverage     53.57%   53.53%   -0.04%     
+ Complexity     1399     1398       -1     
============================================
  Files           301      301              
  Lines         11556    11564       +8     
  Branches       1521     1523       +2     
============================================
  Hits           6191     6191              
- Misses         4371     4377       +6     
- Partials        994      996       +2     

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[kelson42]

@MohitMaliFtechiz What is missing here to complete this PR?

[MohitMaliFtechiz]

@MohitMaliFtechiz What is missing here to complete this PR?

@kelson42 The testing of this PR is missing(uploading to the playStore). I am on the way to testing the app-bundle with the combination of (install-time, and fast-follow) with a 1.5GB split file. We had only decided that time we would use the combination of install-time and fast-follow to upload the ZIM file up to 1.5GB but we had not tested that, how it would perform.

[kelson42]

For now, only install-time.

[MohitMaliFtechiz]

@kelson42 I have tested the uploading of the aab file on playStore only with install-time mode, and it uploaded the 1.47GB file with this install-time delivery mode without having the combination of (install-time and fast-follow). Also, I can read the ZIM file after just installing the application. So, our first issue is fixed, where we cannot upload the aab file of more than 512MB in play asset delivery mode.

I also tested uploading aab files larger than 1.5GB. I successfully uploaded a 1.52GB aab file to PlayStore. However, I have not fully tested it because the ZIM chunks were made from different files, and I don't have a single ZIM file between 1.5GB and 2GB. Downloading large files from the server taking too long(it almost took me 4-5 hours and still downloading is not completed). Nevertheless, the file uploaded successfully under the install-time delivery mode, and the size displayed during download is over 1.5GB, so we can assume it will be available immediately after downloading the application. We will test this scenario while uploading the WikiSpecies, and Medical Wikipedia(wikimed) which have large files.