zlib: Improve coverage of io functions

[serge-sans-paille]

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[github-actions]

serge-sans-paille is a new contributor to projects/zlib. The PR must be approved by known contributors before it can be merged. The past contributors are: fanquake, conNULL, hkctkuy, jvoisin, inferno-chromium, devtty1er, Dor1s, gcp1304 (unverified), ProgramMax (unverified), sebpop (unverified), glennrp (unverified), ssbr (unverified), mikea (unverified)

[serge-sans-paille]

cc @DonggeLiu

[serge-sans-paille]

Also cc @jonathanmetzman ^^

[jonathanmetzman]

Can you ask one of the zlib maintainers to approve this?

[serge-sans-paille]

@sebpop you're listed as auto_ccs in zlib's project.yaml, could you have a look at this patch?

Also @madler as the original author of zlib, would you mind giving your opinion on the fuzzer added in this patch? Thanks!

[serge-sans-paille]

@jonathanmetzman there doesn't seem to be a lot of activity from the original maintainer. I see you've already landed PR in that project in the past, what would be your recommendation?
Thanks!

[madler]

@jonathanmetzman there doesn't seem to be a lot of activity from the original maintainer.

Maintainer of what?

[serge-sans-paille]

@madler maintainers of the oss-fuzz zlib subproject, not of the upstream zlib, i.e. not you :-)