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diff --git a/external/rapidjson/error/en.h b/external/rapidjson/error/en.h
new file mode 100644
index 0000000..2db838b
--- /dev/null
+++ b/external/rapidjson/error/en.h
@@ -0,0 +1,74 @@
+// 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_ERROR_EN_H_
+#define RAPIDJSON_ERROR_EN_H_
+
+#include "error.h"
+
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(switch-enum)
+RAPIDJSON_DIAG_OFF(covered-switch-default)
+#endif
+
+RAPIDJSON_NAMESPACE_BEGIN
+
+//! Maps error code of parsing into error message.
+/*!
+    \ingroup RAPIDJSON_ERRORS
+    \param parseErrorCode Error code obtained in parsing.
+    \return the error message.
+    \note User can make a copy of this function for localization.
+        Using switch-case is safer for future modification of error codes.
+*/
+inline const RAPIDJSON_ERROR_CHARTYPE* GetParseError_En(ParseErrorCode parseErrorCode) {
+    switch (parseErrorCode) {
+        case kParseErrorNone:                           return RAPIDJSON_ERROR_STRING("No error.");
+
+        case kParseErrorDocumentEmpty:                  return RAPIDJSON_ERROR_STRING("The document is empty.");
+        case kParseErrorDocumentRootNotSingular:        return RAPIDJSON_ERROR_STRING("The document root must not be followed by other values.");
+    
+        case kParseErrorValueInvalid:                   return RAPIDJSON_ERROR_STRING("Invalid value.");
+    
+        case kParseErrorObjectMissName:                 return RAPIDJSON_ERROR_STRING("Missing a name for object member.");
+        case kParseErrorObjectMissColon:                return RAPIDJSON_ERROR_STRING("Missing a colon after a name of object member.");
+        case kParseErrorObjectMissCommaOrCurlyBracket:  return RAPIDJSON_ERROR_STRING("Missing a comma or '}' after an object member.");
+    
+        case kParseErrorArrayMissCommaOrSquareBracket:  return RAPIDJSON_ERROR_STRING("Missing a comma or ']' after an array element.");
+
+        case kParseErrorStringUnicodeEscapeInvalidHex:  return RAPIDJSON_ERROR_STRING("Incorrect hex digit after \\u escape in string.");
+        case kParseErrorStringUnicodeSurrogateInvalid:  return RAPIDJSON_ERROR_STRING("The surrogate pair in string is invalid.");
+        case kParseErrorStringEscapeInvalid:            return RAPIDJSON_ERROR_STRING("Invalid escape character in string.");
+        case kParseErrorStringMissQuotationMark:        return RAPIDJSON_ERROR_STRING("Missing a closing quotation mark in string.");
+        case kParseErrorStringInvalidEncoding:          return RAPIDJSON_ERROR_STRING("Invalid encoding in string.");
+
+        case kParseErrorNumberTooBig:                   return RAPIDJSON_ERROR_STRING("Number too big to be stored in double.");
+        case kParseErrorNumberMissFraction:             return RAPIDJSON_ERROR_STRING("Miss fraction part in number.");
+        case kParseErrorNumberMissExponent:             return RAPIDJSON_ERROR_STRING("Miss exponent in number.");
+
+        case kParseErrorTermination:                    return RAPIDJSON_ERROR_STRING("Terminate parsing due to Handler error.");
+        case kParseErrorUnspecificSyntaxError:          return RAPIDJSON_ERROR_STRING("Unspecific syntax error.");
+
+        default:                                        return RAPIDJSON_ERROR_STRING("Unknown error.");
+    }
+}
+
+RAPIDJSON_NAMESPACE_END
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
+
+#endif // RAPIDJSON_ERROR_EN_H_
diff --git a/external/rapidjson/error/error.h b/external/rapidjson/error/error.h
new file mode 100644
index 0000000..9311d2f
--- /dev/null
+++ b/external/rapidjson/error/error.h
@@ -0,0 +1,161 @@
+// 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_ERROR_ERROR_H_
+#define RAPIDJSON_ERROR_ERROR_H_
+
+#include "../rapidjson.h"
+
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(padded)
+#endif
+
+/*! \file error.h */
+
+/*! \defgroup RAPIDJSON_ERRORS RapidJSON error handling */
+
+///////////////////////////////////////////////////////////////////////////////
+// RAPIDJSON_ERROR_CHARTYPE
+
+//! Character type of error messages.
+/*! \ingroup RAPIDJSON_ERRORS
+    The default character type is \c char.
+    On Windows, user can define this macro as \c TCHAR for supporting both
+    unicode/non-unicode settings.
+*/
+#ifndef RAPIDJSON_ERROR_CHARTYPE
+#define RAPIDJSON_ERROR_CHARTYPE char
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+// RAPIDJSON_ERROR_STRING
+
+//! Macro for converting string literial to \ref RAPIDJSON_ERROR_CHARTYPE[].
+/*! \ingroup RAPIDJSON_ERRORS
+    By default this conversion macro does nothing.
+    On Windows, user can define this macro as \c _T(x) for supporting both
+    unicode/non-unicode settings.
+*/
+#ifndef RAPIDJSON_ERROR_STRING
+#define RAPIDJSON_ERROR_STRING(x) x
+#endif
+
+RAPIDJSON_NAMESPACE_BEGIN
+
+///////////////////////////////////////////////////////////////////////////////
+// ParseErrorCode
+
+//! Error code of parsing.
+/*! \ingroup RAPIDJSON_ERRORS
+    \see GenericReader::Parse, GenericReader::GetParseErrorCode
+*/
+enum ParseErrorCode {
+    kParseErrorNone = 0,                        //!< No error.
+
+    kParseErrorDocumentEmpty,                   //!< The document is empty.
+    kParseErrorDocumentRootNotSingular,         //!< The document root must not follow by other values.
+
+    kParseErrorValueInvalid,                    //!< Invalid value.
+
+    kParseErrorObjectMissName,                  //!< Missing a name for object member.
+    kParseErrorObjectMissColon,                 //!< Missing a colon after a name of object member.
+    kParseErrorObjectMissCommaOrCurlyBracket,   //!< Missing a comma or '}' after an object member.
+
+    kParseErrorArrayMissCommaOrSquareBracket,   //!< Missing a comma or ']' after an array element.
+
+    kParseErrorStringUnicodeEscapeInvalidHex,   //!< Incorrect hex digit after \\u escape in string.
+    kParseErrorStringUnicodeSurrogateInvalid,   //!< The surrogate pair in string is invalid.
+    kParseErrorStringEscapeInvalid,             //!< Invalid escape character in string.
+    kParseErrorStringMissQuotationMark,         //!< Missing a closing quotation mark in string.
+    kParseErrorStringInvalidEncoding,           //!< Invalid encoding in string.
+
+    kParseErrorNumberTooBig,                    //!< Number too big to be stored in double.
+    kParseErrorNumberMissFraction,              //!< Miss fraction part in number.
+    kParseErrorNumberMissExponent,              //!< Miss exponent in number.
+
+    kParseErrorTermination,                     //!< Parsing was terminated.
+    kParseErrorUnspecificSyntaxError            //!< Unspecific syntax error.
+};
+
+//! Result of parsing (wraps ParseErrorCode)
+/*!
+    \ingroup RAPIDJSON_ERRORS
+    \code
+        Document doc;
+        ParseResult ok = doc.Parse("[42]");
+        if (!ok) {
+            fprintf(stderr, "JSON parse error: %s (%u)",
+                    GetParseError_En(ok.Code()), ok.Offset());
+            exit(EXIT_FAILURE);
+        }
+    \endcode
+    \see GenericReader::Parse, GenericDocument::Parse
+*/
+struct ParseResult {
+    //!! Unspecified boolean type
+    typedef bool (ParseResult::*BooleanType)() const;
+public:
+    //! Default constructor, no error.
+    ParseResult() : code_(kParseErrorNone), offset_(0) {}
+    //! Constructor to set an error.
+    ParseResult(ParseErrorCode code, size_t offset) : code_(code), offset_(offset) {}
+
+    //! Get the error code.
+    ParseErrorCode Code() const { return code_; }
+    //! Get the error offset, if \ref IsError(), 0 otherwise.
+    size_t Offset() const { return offset_; }
+
+    //! Explicit conversion to \c bool, returns \c true, iff !\ref IsError().
+    operator BooleanType() const { return !IsError() ? &ParseResult::IsError : NULL; }
+    //! Whether the result is an error.
+    bool IsError() const { return code_ != kParseErrorNone; }
+
+    bool operator==(const ParseResult& that) const { return code_ == that.code_; }
+    bool operator==(ParseErrorCode code) const { return code_ == code; }
+    friend bool operator==(ParseErrorCode code, const ParseResult & err) { return code == err.code_; }
+
+    bool operator!=(const ParseResult& that) const { return !(*this == that); }
+    bool operator!=(ParseErrorCode code) const { return !(*this == code); }
+    friend bool operator!=(ParseErrorCode code, const ParseResult & err) { return err != code; }
+
+    //! Reset error code.
+    void Clear() { Set(kParseErrorNone); }
+    //! Update error code and offset.
+    void Set(ParseErrorCode code, size_t offset = 0) { code_ = code; offset_ = offset; }
+
+private:
+    ParseErrorCode code_;
+    size_t offset_;
+};
+
+//! Function pointer type of GetParseError().
+/*! \ingroup RAPIDJSON_ERRORS
+
+    This is the prototype for \c GetParseError_X(), where \c X is a locale.
+    User can dynamically change locale in runtime, e.g.:
+\code
+    GetParseErrorFunc GetParseError = GetParseError_En; // or whatever
+    const RAPIDJSON_ERROR_CHARTYPE* s = GetParseError(document.GetParseErrorCode());
+\endcode
+*/
+typedef const RAPIDJSON_ERROR_CHARTYPE* (*GetParseErrorFunc)(ParseErrorCode);
+
+RAPIDJSON_NAMESPACE_END
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
+
+#endif // RAPIDJSON_ERROR_ERROR_H_