Hello,
I'm developing an encryption plugin for dovecot and ran into a problem with the stacking of i/o-streams.
The encryption i/o-streams are working fine on any kind of mail the test suite is passing through them. But as soon as the zlib plugin is enabled the logs show an cache error:
failed: Cached message size larger than expected (214 > 206, box=INBOX, UID=1)
I've already double-checked the return values of ostream's sendv and istream's read function. They seem correct (and equal).
If the order of the streams are changed (by changing the number in the lib-filename libxx_scrambler.so); meaning that the encryption is done before the compression (which isn't efficient) both streams are working correct without any errors.
Is there some way the zlib plugin changes the cached message size? Is there some behaviour of the zlib plugin that I'm missing? Any help would be very welcome.
Best regards, Philipp
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