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tls: reduce memory copying and number of BIO buffer allocations
Avoid copying buffers before passing to SSL_write if there are zero length buffers involved. Only copy the data when the buffer has a non zero length. Send a memory allocation hint to the crypto BIO about how much memory will likely be needed to be allocated by the next call to SSL_write. This makes a single allocation rather than the BIO allocating a buffer for each 16k TLS segment written. This solves a problem with large buffers written over TLS triggering V8's GC. PR-URL: #31499 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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