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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
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//
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// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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//
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// Licensed under the MIT License (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://opensource.org/licenses/MIT
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//
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#ifndef RAPIDJSON_FILEWRITESTREAM_H_
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#define RAPIDJSON_FILEWRITESTREAM_H_
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#include "stream.h"
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#include <cstdio>
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#ifdef __clang__
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(unreachable-code)
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#endif
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RAPIDJSON_NAMESPACE_BEGIN
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//! Wrapper of C file stream for input using fread().
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/*!
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\note implements Stream concept
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*/
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class FileWriteStream {
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public:
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typedef char Ch; //!< Character type. Only support char.
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FileWriteStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferEnd_(buffer + bufferSize), current_(buffer_) {
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RAPIDJSON_ASSERT(fp_ != 0);
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}
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void Put(char c) {
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if (current_ >= bufferEnd_)
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Flush();
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*current_++ = c;
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}
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void PutN(char c, size_t n) {
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size_t avail = static_cast<size_t>(bufferEnd_ - current_);
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while (n > avail) {
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std::memset(current_, c, avail);
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current_ += avail;
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Flush();
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n -= avail;
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avail = static_cast<size_t>(bufferEnd_ - current_);
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}
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if (n > 0) {
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std::memset(current_, c, n);
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current_ += n;
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}
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}
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void Flush() {
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if (current_ != buffer_) {
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size_t result = fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_);
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if (result < static_cast<size_t>(current_ - buffer_)) {
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// failure deliberately ignored at this time
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// added to avoid warn_unused_result build errors
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}
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current_ = buffer_;
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}
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}
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// Not implemented
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char Peek() const { RAPIDJSON_ASSERT(false); return 0; }
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char Take() { RAPIDJSON_ASSERT(false); return 0; }
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size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
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char* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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size_t PutEnd(char*) { RAPIDJSON_ASSERT(false); return 0; }
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private:
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// Prohibit copy constructor & assignment operator.
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FileWriteStream(const FileWriteStream&);
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FileWriteStream& operator=(const FileWriteStream&);
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std::FILE* fp_;
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char *buffer_;
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char *bufferEnd_;
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char *current_;
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};
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//! Implement specialized version of PutN() with memset() for better performance.
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template<>
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inline void PutN(FileWriteStream& stream, char c, size_t n) {
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stream.PutN(c, n);
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}
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RAPIDJSON_NAMESPACE_END
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#ifdef __clang__
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RAPIDJSON_DIAG_POP
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#endif
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#endif // RAPIDJSON_FILESTREAM_H_
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