[mbed-tls] Get size of available application data without calling mbedtls_ssl_read()

Hi all,

I'd like to know if there is some way to retrieve the currently available number of bytes of application data without calling mbedtls_ssl_read()?

I'm writing a "TLS socket" for higher layers to use and would like to notify them when new application data is available, tell them how much it is, but leave it up to them when and how much to retrieve. I'd like to prevent having to buffer all application data inside my TLS socket, because that would mean copying it once from mbedtls' buffer to my socket and then again from there to the application whenever it actually requests the data.

After a quick look into the sources, it seems like, if at all, this might be possible for single records. But all related fields are private and I could not find any API for this.

Issue #551 [1] seems related, but is more about peeking into the application data, while I would be fine with knowing just the size of available application data.

Thanks for any hints on how I could achieve this.

Best regards, Jan

[1] https://github.com/Mbed-TLS/mbedtls/issues/551

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