brotli CLI: how to stop continuous compression and write valid file?

[derhuerst]

I'm trying to compress a the data from continuous stream of logs for a certain period of time. At some point, I want the brotli CLI to stop compressing and write a clean/valid brotli-compressed file.

bash -c 'while true; do echo "some log line"; sleep 1; done' | brotli >logs.txt.br
# After some time, I send SIGINT via ctrl + c.
# ^C

# Once the `brotli` process has exited, I would expect to be able to read the compressed file. However, this is not possible:
brotli -d foo.txt.br | wc -l
# corrupt input [foo.txt.br]
#        0

This also doesn't work with SIGQUIT, SIGTERM and SIGHUP.