Function newRandFromSeed

json_fuzz_test.go:129–142

============================================================================= Deterministic RNG seeding from fuzz inputs ============================================================================= newRandFromSeed derives a deterministic *rand.Rand from the fuzz inputs. This lets the fuzz body make

(seeds ...[]byte)

// coverage feedback remains meaningful). Uses FNV-1a for speed (no allocs
// beyond the rand.Rand struct itself).
func newRandFromSeed(seeds ...[]byte) *rand.Rand {
	const (
		offsetBasis uint64 = 14695981039346656037
		fnvPrime    uint64 = 1099511628211
	)
	h := offsetBasis
	for _, s := range seeds {
		for _, b := range s {
			h ^= uint64(b)
			h *= fnvPrime
		}
	}
	return rand.New(rand.NewSource(int64(h)))
}

// =============================================================================
// Recursive JSON value generator (grammar-based)