diff options
| author | Dmitry Vyukov <dvyukov@google.com> | 2022-11-24 12:33:42 +0100 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2022-11-25 13:53:49 +0100 |
| commit | 0e8f14dcc4db15a509dc2ba4b291e2c28fc51ca0 (patch) | |
| tree | 87db770b7786c0018a58e979a2d2a8b8257d871b /prog/mutation.go | |
| parent | 70393e5d05ae78166599755b835f0d465c815f48 (diff) | |
prog: refactor HeatMap
Provide NumMutations method instead of Size.
It allows HeatMap to choose number of mutations better
(e.g. for completely empty/flat images w/o interesting data).
Diffstat (limited to 'prog/mutation.go')
| -rw-r--r-- | prog/mutation.go | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/prog/mutation.go b/prog/mutation.go index 881403247..96e11516c 100644 --- a/prog/mutation.go +++ b/prog/mutation.go @@ -401,11 +401,9 @@ func (r *randGen) mutateImage(image []byte) (data []byte, retry bool) { if len(data) == 0 { return image, true // Do not mutate empty data. } - hm := MakeGenericHeatmap(data) - // At least two mutations, up to about one mutation every 128 KB of heatmap size. - numMutations := r.Intn(hm.Size()/(1<<17)+1) + 2 - for i := 0; i < numMutations; i++ { - index := hm.ChooseLocation(r.Rand) + hm := MakeGenericHeatmap(data, r.Rand) + for i := hm.NumMutations(); i > 0; i-- { + index := hm.ChooseLocation() width := 1 << uint(r.Intn(4)) if index+width > len(data) { width = 1 |