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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_FILEWRITESTREAM_H_
+#define RAPIDJSON_FILEWRITESTREAM_H_
+
+#include "stream.h"
+#include <cstdio>
+
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(unreachable-code)
+#endif
+
+RAPIDJSON_NAMESPACE_BEGIN
+
+//! Wrapper of C file stream for input using fread().
+/*!
+ \note implements Stream concept
+*/
+class FileWriteStream {
+public:
+ typedef char Ch; //!< Character type. Only support char.
+
+ FileWriteStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferEnd_(buffer + bufferSize), current_(buffer_) {
+ RAPIDJSON_ASSERT(fp_ != 0);
+ }
+
+ void Put(char c) {
+ if (current_ >= bufferEnd_)
+ Flush();
+
+ *current_++ = c;
+ }
+
+ void PutN(char c, size_t n) {
+ size_t avail = static_cast<size_t>(bufferEnd_ - current_);
+ while (n > avail) {
+ std::memset(current_, c, avail);
+ current_ += avail;
+ Flush();
+ n -= avail;
+ avail = static_cast<size_t>(bufferEnd_ - current_);
+ }
+
+ if (n > 0) {
+ std::memset(current_, c, n);
+ current_ += n;
+ }
+ }
+
+ void Flush() {
+ if (current_ != buffer_) {
+ size_t result = fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_);
+ if (result < static_cast<size_t>(current_ - buffer_)) {
+ // failure deliberately ignored at this time
+ // added to avoid warn_unused_result build errors
+ }
+ current_ = buffer_;
+ }
+ }
+
+ // Not implemented
+ char Peek() const { RAPIDJSON_ASSERT(false); return 0; }
+ char Take() { RAPIDJSON_ASSERT(false); return 0; }
+ size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
+ char* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
+ size_t PutEnd(char*) { RAPIDJSON_ASSERT(false); return 0; }
+
+private:
+ // Prohibit copy constructor & assignment operator.
+ FileWriteStream(const FileWriteStream&);
+ FileWriteStream& operator=(const FileWriteStream&);
+
+ std::FILE* fp_;
+ char *buffer_;
+ char *bufferEnd_;
+ char *current_;
+};
+
+//! Implement specialized version of PutN() with memset() for better performance.
+template<>
+inline void PutN(FileWriteStream& stream, char c, size_t n) {
+ stream.PutN(c, n);
+}
+
+RAPIDJSON_NAMESPACE_END
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
+
+#endif // RAPIDJSON_FILESTREAM_H_