1 files changed, 47 insertions, 0 deletions
diff --git a/fxjse/value.cpp b/fxjse/value.cpp
index a49ee312f3..743169dd7b 100644
--- a/fxjse/value.cpp
+++ b/fxjse/value.cpp
@@ -11,6 +11,47 @@
 #include "fxjse/context.h"
 #include "fxjse/include/cfxjse_class.h"
 
+namespace {
+
+double FXJSE_ftod(FX_FLOAT fNumber) {
+  static_assert(sizeof(FX_FLOAT) == 4, "FX_FLOAT of incorrect size");
+
+  uint32_t nFloatBits = (uint32_t&)fNumber;
+  uint8_t nExponent = (uint8_t)(nFloatBits >> 23);
+  if (nExponent == 0 || nExponent == 255)
+    return fNumber;
+
+  int8_t nErrExp = nExponent - 150;
+  if (nErrExp >= 0)
+    return fNumber;
+
+  double dwError = pow(2.0, nErrExp), dwErrorHalf = dwError / 2;
+  double dNumber = fNumber, dNumberAbs = fabs(fNumber);
+  double dNumberAbsMin = dNumberAbs - dwErrorHalf,
+         dNumberAbsMax = dNumberAbs + dwErrorHalf;
+  int32_t iErrPos = 0;
+  if (floor(dNumberAbsMin) == floor(dNumberAbsMax)) {
+    dNumberAbsMin = fmod(dNumberAbsMin, 1.0);
+    dNumberAbsMax = fmod(dNumberAbsMax, 1.0);
+    int32_t iErrPosMin = 1, iErrPosMax = 38;
+    do {
+      int32_t iMid = (iErrPosMin + iErrPosMax) / 2;
+      double dPow = pow(10.0, iMid);
+      if (floor(dNumberAbsMin * dPow) == floor(dNumberAbsMax * dPow)) {
+        iErrPosMin = iMid + 1;
+      } else {
+        iErrPosMax = iMid;
+      }
+    } while (iErrPosMin < iErrPosMax);
+    iErrPos = iErrPosMax;
+  }
+  double dPow = pow(10.0, iErrPos);
+  return fNumber < 0 ? ceil(dNumber * dPow - 0.5) / dPow
+                     : floor(dNumber * dPow + 0.5) / dPow;
+}
+
+}  // namespace
+
 void FXJSE_ThrowMessage(const CFX_ByteStringC& utf8Message) {
   v8::Isolate* pIsolate = v8::Isolate::GetCurrent();
   ASSERT(pIsolate);
@@ -77,6 +118,12 @@ void CFXJSE_Value::SetDate(double dDouble) {
   m_hValue.Reset(m_pIsolate, hDate);
 }
 
+void CFXJSE_Value::SetFloat(FX_FLOAT fFloat) {
+  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
+  v8::Local<v8::Value> pValue = v8::Number::New(m_pIsolate, FXJSE_ftod(fFloat));
+  m_hValue.Reset(m_pIsolate, pValue);
+}
+
 FX_BOOL CFXJSE_Value::SetObjectProperty(const CFX_ByteStringC& szPropName,
                                         CFXJSE_Value* lpPropValue) {
   ASSERT(lpPropValue);