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+// 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_ISTREAMWRAPPER_H_
+#define RAPIDJSON_ISTREAMWRAPPER_H_
+
+#include "stream.h"
+#include <iosfwd>
+
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(padded)
+#endif
+
+#ifdef _MSC_VER
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(4351) // new behavior: elements of array 'array' will be default initialized
+#endif
+
+RAPIDJSON_NAMESPACE_BEGIN
+
+//! Wrapper of \c std::basic_istream into RapidJSON's Stream concept.
+/*!
+ The classes can be wrapped including but not limited to:
+
+ - \c std::istringstream
+ - \c std::stringstream
+ - \c std::wistringstream
+ - \c std::wstringstream
+ - \c std::ifstream
+ - \c std::fstream
+ - \c std::wifstream
+ - \c std::wfstream
+
+ \tparam StreamType Class derived from \c std::basic_istream.
+*/
+
+template <typename StreamType>
+class BasicIStreamWrapper {
+public:
+ typedef typename StreamType::char_type Ch;
+ BasicIStreamWrapper(StreamType& stream) : stream_(stream), count_(), peekBuffer_() {}
+
+ Ch Peek() const {
+ typename StreamType::int_type c = stream_.peek();
+ return RAPIDJSON_LIKELY(c != StreamType::traits_type::eof()) ? static_cast<Ch>(c) : '\0';
+ }
+
+ Ch Take() {
+ typename StreamType::int_type c = stream_.get();
+ if (RAPIDJSON_LIKELY(c != StreamType::traits_type::eof())) {
+ count_++;
+ return static_cast<Ch>(c);
+ }
+ else
+ return '\0';
+ }
+
+ // tellg() may return -1 when failed. So we count by ourself.
+ size_t Tell() const { return count_; }
+
+ Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
+ void Put(Ch) { RAPIDJSON_ASSERT(false); }
+ void Flush() { RAPIDJSON_ASSERT(false); }
+ size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
+
+ // For encoding detection only.
+ const Ch* Peek4() const {
+ RAPIDJSON_ASSERT(sizeof(Ch) == 1); // Only usable for byte stream.
+ int i;
+ bool hasError = false;
+ for (i = 0; i < 4; ++i) {
+ typename StreamType::int_type c = stream_.get();
+ if (c == StreamType::traits_type::eof()) {
+ hasError = true;
+ stream_.clear();
+ break;
+ }
+ peekBuffer_[i] = static_cast<Ch>(c);
+ }
+ for (--i; i >= 0; --i)
+ stream_.putback(peekBuffer_[i]);
+ return !hasError ? peekBuffer_ : 0;
+ }
+
+private:
+ BasicIStreamWrapper(const BasicIStreamWrapper&);
+ BasicIStreamWrapper& operator=(const BasicIStreamWrapper&);
+
+ StreamType& stream_;
+ size_t count_; //!< Number of characters read. Note:
+ mutable Ch peekBuffer_[4];
+};
+
+typedef BasicIStreamWrapper<std::istream> IStreamWrapper;
+typedef BasicIStreamWrapper<std::wistream> WIStreamWrapper;
+
+#if defined(__clang__) || defined(_MSC_VER)
+RAPIDJSON_DIAG_POP
+#endif
+
+RAPIDJSON_NAMESPACE_END
+
+#endif // RAPIDJSON_ISTREAMWRAPPER_H_