text: #ifndef RAPIDJSON_FILEREADSTREAM_H_
  #define RAPIDJSON_FILEREADSTREAM_H_
  
  #include "rapidjson.h"
  #include <cstdio>
  
  namespace rapidjson {
  
  //! File byte stream for input using fread().
  /*!
  	\implements Stream
  */
  class FileReadStream {
  public:
  	typedef char Ch;	//!< Character type (byte).
  
  	//! Constructor.
  	/*!
  		\param fp File pointer opened for read.
  		\param buffer user-supplied buffer.
  		\param bufferSize size of buffer in bytes. Must >=4 bytes.
  	*/
  	FileReadStream(FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) { 
  		RAPIDJSON_ASSERT(fp_ != 0);
  		RAPIDJSON_ASSERT(bufferSize >= 4);
  		Read();
  	}
  
  	Ch Peek() const { return *current_; }
  	Ch Take() { Ch c = *current_; Read(); return c; }
  	size_t Tell() const { return count_ + (current_ - buffer_); }
  
  	// Not implemented
  	void Put(Ch c) { RAPIDJSON_ASSERT(false); }
  	void Flush() { RAPIDJSON_ASSERT(false); } 
  	Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
  	size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
  
  	// For encoding detection only.
  	const Ch* Peek4() const {
  		return (current_ + 4 <= bufferLast_) ? current_ : 0;
  	}
  
  private:
  	void Read() {
  		if (current_ < bufferLast_)
  			++current_;
  		else if (!eof_) {
  			count_ += readCount_;
  			readCount_ = fread(buffer_, 1, bufferSize_, fp_);
  			bufferLast_ = buffer_ + readCount_ - 1;
  			current_ = buffer_;
  
  			if (readCount_ < bufferSize_) {
  				buffer_[readCount_] = '\0';
  				++bufferLast_;
  				eof_ = true;
  			}
  		}
  	}
  
  	FILE* fp_;
  	Ch *buffer_;
  	size_t bufferSize_;
  	Ch *bufferLast_;
  	Ch *current_;
  	size_t readCount_;
  	size_t count_;	//!< Number of characters read
  	bool eof_;
  };
  
  } // namespace rapidjson
  
  #endif // RAPIDJSON_FILESTREAM_H_
  