First pass idLib conversion from hex rays4.

source/shared/idlib/runningaverage.cpp

@@ -0,0 +1,95 @@
+#include "runningaverage.h"
+
+#include <algorithm>
+#include <cstdlib>
+
+idRunningAverage::idRunningAverage()
+    : maxNum(0)
+    , current(0)
+    , vals{nullptr, 0, 0, 16, 5, 0} {
+}
+
+idRunningAverage::~idRunningAverage() {
+    std::free(vals.list);
+}
+
+float idRunningAverage::GetAverage() {
+    if (vals.num == 0) {
+        return 0.0f;
+    }
+
+    float total = 0.0f;
+    for (int index = 0; index < vals.num; ++index) {
+        total += vals.list[index];
+    }
+    return total / static_cast<float>(vals.num);
+}
+
+float idRunningAverage::GetMin() {
+    if (vals.num == 0) {
+        return 0.0f;
+    }
+
+    float minimum = vals.list[0];
+    for (int index = 1; index < vals.num; ++index) {
+        minimum = std::min(minimum, vals.list[index]);
+    }
+    return minimum;
+}
+
+float idRunningAverage::GetMax() {
+    if (vals.num == 0) {
+        return 0.0f;
+    }
+
+    float maximum = vals.list[0];
+    for (int index = 1; index < vals.num; ++index) {
+        maximum = std::max(maximum, vals.list[index]);
+    }
+    return maximum;
+}
+
+void idRunningAverage::Init(const int num) {
+    current = 0;
+
+    if (num <= 0) {
+        vals.num = 0;
+        maxNum = 0;
+        return;
+    }
+
+    if (vals.size < num) {
+        float* const replacement = static_cast<float*>(
+            std::malloc(sizeof(float) * static_cast<std::size_t>(num))
+        );
+        if (replacement == nullptr) {
+            vals.num = 0;
+            maxNum = 0;
+            return;
+        }
+        std::free(vals.list);
+        vals.list = replacement;
+        vals.size = num;
+    }
+
+    vals.num = 0;
+    maxNum = num;
+}
+
+void idRunningAverage::Add(const float val) {
+    if (maxNum <= 0) {
+        return;
+    }
+
+    if (vals.num != maxNum) {
+        ++vals.num;
+        current = vals.num - 1;
+    } else {
+        ++current;
+        if (current >= maxNum) {
+            current = 0;
+        }
+    }
+
+    vals.list[current] = val;
+}