avutil/imgutils: Optimize memset_bytes() by using av_memcpy_backptr()
authorMichael Niedermayer <michael@niedermayer.cc>
Tue, 25 Dec 2018 22:15:20 +0000 (23:15 +0100)
committerMichael Niedermayer <michael@niedermayer.cc>
Mon, 21 Jan 2019 06:53:26 +0000 (07:53 +0100)
commita8b5990f4594d511a854f7d9920573d33c85253a
treebde7f41c028f5951773068fbabc6d0b579f51652
parentcb6af7dfa1499969d8b70c6b1fe3e9d284a69276
avutil/imgutils: Optimize memset_bytes() by using av_memcpy_backptr()

This is strongly based on code by Marton Balint, and depends on the previous commit

Fixes: Timeout
Fixes: 11502/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WCMV_fuzzer-5664893810769920
Before: Executed clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WCMV_fuzzer-5664893810769920 in 11209 ms
After:  Executed clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WCMV_fuzzer-5664893810769920 in  4104 ms

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit f64c0dffa13e6263de3fdff0058ab2fdb03ac1d6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavutil/imgutils.c