tree 631703e7f946341e6c68d577ad47e80feaa64c65
parent 9402ac5c08806f4ba400bc390420c29ddd78ecd1
author Alexey Ivanov <SaveTheRbtz@GMail.com> 1538490517 -0700
committer Eugene Kliuchnikov <eustas@google.com> 1538490517 +0200

tools/brotli: improve window size autodetect (#710)

Window size is defined as:
    `(1 << BROTLI_PARAM_LGWIN) - 16`
in `c/include/brotli/encode.h`

Therefore we should probably take these 16 bytes into account.

Done basic manual testing:
$ python3 -c 'print ("A"*2046)' > t
$ bazel run -- //:brotli -w 0 -f -o $(realpath t).br $(realpath ./t)
$ python3 research/brotlidump.py t.br |& fgrep WSIZE
0000  c1                1000001 WSIZE   windowsize=(1<<12)-16=4080

New version properly detects window size of `4080`, while previous one used `2032`:
$ python3 research/brotlidump.py t.br |& fgrep WSIZE
0000  b1                0110001 WSIZE   windowsize=(1<<11)-16=2032