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98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
// Copyright (C) 2011 Milo Yip
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef RAPIDJSON_FILEWRITESTREAM_H_
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#define RAPIDJSON_FILEWRITESTREAM_H_
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#include "rapidjson.h"
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#include <cstdio>
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namespace rapidjson {
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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(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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fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_);
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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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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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} // namespace rapidjson
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#endif // RAPIDJSON_FILESTREAM_H_
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