1 files changed, 100 insertions, 0 deletions
diff --git a/third_party/rapidjson/internal/ieee754.h b/third_party/rapidjson/internal/ieee754.h
new file mode 100644
index 00000000..9a84d645
--- /dev/null
+++ b/third_party/rapidjson/internal/ieee754.h
@@ -0,0 +1,100 @@
+// Tencent is pleased to support the open source community by making RapidJSON
+// available.
+//
+// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All
+// rights reserved.
+//
+// Licensed under the MIT License (the "License"); you may not use this file
+// except in compliance with the License. You may obtain a copy of the License
+// at
+//
+// http://opensource.org/licenses/MIT
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#ifndef RAPIDJSON_IEEE754_
+#define RAPIDJSON_IEEE754_
+
+#include "rapidjson/rapidjson.h"
+
+RAPIDJSON_NAMESPACE_BEGIN
+namespace internal {
+
+class Double {
+ public:
+  Double() {}
+  Double(double d) : d_(d) {}
+  Double(uint64_t u) : u_(u) {}
+
+  double Value() const { return d_; }
+  uint64_t Uint64Value() const { return u_; }
+
+  double NextPositiveDouble() const {
+    RAPIDJSON_ASSERT(!Sign());
+    return Double(u_ + 1).Value();
+  }
+
+  bool Sign() const { return (u_ & kSignMask) != 0; }
+  uint64_t Significand() const { return u_ & kSignificandMask; }
+  int Exponent() const {
+    return static_cast<int>(((u_ & kExponentMask) >> kSignificandSize) -
+                            kExponentBias);
+  }
+
+  bool IsNan() const {
+    return (u_ & kExponentMask) == kExponentMask && Significand() != 0;
+  }
+  bool IsInf() const {
+    return (u_ & kExponentMask) == kExponentMask && Significand() == 0;
+  }
+  bool IsNanOrInf() const { return (u_ & kExponentMask) == kExponentMask; }
+  bool IsNormal() const {
+    return (u_ & kExponentMask) != 0 || Significand() == 0;
+  }
+  bool IsZero() const { return (u_ & (kExponentMask | kSignificandMask)) == 0; }
+
+  uint64_t IntegerSignificand() const {
+    return IsNormal() ? Significand() | kHiddenBit : Significand();
+  }
+  int IntegerExponent() const {
+    return (IsNormal() ? Exponent() : kDenormalExponent) - kSignificandSize;
+  }
+  uint64_t ToBias() const {
+    return (u_ & kSignMask) ? ~u_ + 1 : u_ | kSignMask;
+  }
+
+  static unsigned EffectiveSignificandSize(int order) {
+    if (order >= -1021)
+      return 53;
+    else if (order <= -1074)
+      return 0;
+    else
+      return static_cast<unsigned>(order) + 1074;
+  }
+
+ private:
+  static const int kSignificandSize = 52;
+  static const int kExponentBias = 0x3FF;
+  static const int kDenormalExponent = 1 - kExponentBias;
+  static const uint64_t kSignMask = RAPIDJSON_UINT64_C2(0x80000000, 0x00000000);
+  static const uint64_t kExponentMask =
+      RAPIDJSON_UINT64_C2(0x7FF00000, 0x00000000);
+  static const uint64_t kSignificandMask =
+      RAPIDJSON_UINT64_C2(0x000FFFFF, 0xFFFFFFFF);
+  static const uint64_t kHiddenBit =
+      RAPIDJSON_UINT64_C2(0x00100000, 0x00000000);
+
+  union {
+    double d_;
+    uint64_t u_;
+  };
+};
+
+}  // namespace internal
+RAPIDJSON_NAMESPACE_END
+
+#endif  // RAPIDJSON_IEEE754_