1 files changed, 49 insertions, 2 deletions
diff --git a/native/src/correction.h b/native/src/correction.h
index 0715551d0..aec7bbd73 100644
--- a/native/src/correction.h
+++ b/native/src/correction.h
@@ -36,6 +36,55 @@ class Correction {
         NOT_ON_TERMINAL
     } CorrectionType;
 
+    /////////////////////////
+    // static inline utils //
+    /////////////////////////
+
+    static const int TWO_31ST_DIV_255 = S_INT_MAX / 255;
+    static inline int capped255MultForFullMatchAccentsOrCapitalizationDifference(const int num) {
+        return (num < TWO_31ST_DIV_255 ? 255 * num : S_INT_MAX);
+    }
+
+    static const int TWO_31ST_DIV_2 = S_INT_MAX / 2;
+    inline static void multiplyIntCapped(const int multiplier, int *base) {
+        const int temp = *base;
+        if (temp != S_INT_MAX) {
+            // Branch if multiplier == 2 for the optimization
+            if (multiplier == 2) {
+                *base = TWO_31ST_DIV_2 >= temp ? temp << 1 : S_INT_MAX;
+            } else {
+                // TODO: This overflow check gives a wrong answer when, for example,
+                //       temp = 2^16 + 1 and multiplier = 2^17 + 1.
+                //       Fix this behavior.
+                const int tempRetval = temp * multiplier;
+                *base = tempRetval >= temp ? tempRetval : S_INT_MAX;
+            }
+        }
+    }
+
+    inline static int powerIntCapped(const int base, const int n) {
+        if (n <= 0) return 1;
+        if (base == 2) {
+            return n < 31 ? 1 << n : S_INT_MAX;
+        } else {
+            int ret = base;
+            for (int i = 1; i < n; ++i) multiplyIntCapped(base, &ret);
+            return ret;
+        }
+    }
+
+    inline static void multiplyRate(const int rate, int *freq) {
+        if (*freq != S_INT_MAX) {
+            if (*freq > 1000000) {
+                *freq /= 100;
+                multiplyIntCapped(rate, freq);
+            } else {
+                multiplyIntCapped(rate, freq);
+                *freq /= 100;
+            }
+        }
+    }
+
     Correction(const int typedLetterMultiplier, const int fullWordMultiplier);
     void initCorrection(
             const ProximityInfo *pi, const int inputLength, const int maxWordLength);
@@ -103,8 +152,6 @@ class Correction {
                 const int inputLength);
         static int calcFreqForSplitTwoWords(const int firstFreq, const int secondFreq,
                 const Correction* correction, const unsigned short *word);
-        static int calcFreqForSplitTwoWordsOld(const int firstFreq, const int secondFreq,
-                const Correction* correction, const unsigned short *word);
         static double calcNormalizedScore(const unsigned short* before, const int beforeLength,
                 const unsigned short* after, const int afterLength, const int score);
         static int editDistance(const unsigned short* before,