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ios/cocos2d/external/json/filereadstream.h 2.92 KB
520389e3   xiaoyu   接入cocos源码,编译未通过,继续修改
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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_FILEREADSTREAM_H_
  #define RAPIDJSON_FILEREADSTREAM_H_
  
  #include "stream.h"
  #include <cstdio>
  
  #ifdef __clang__
  RAPIDJSON_DIAG_PUSH
  RAPIDJSON_DIAG_OFF(padded)
  RAPIDJSON_DIAG_OFF(unreachable-code)
  RAPIDJSON_DIAG_OFF(missing-noreturn)
  #endif
  
  RAPIDJSON_NAMESPACE_BEGIN
  
  //! File byte stream for input using fread().
  /*!
      \note implements Stream concept
  */
  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(std::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_ + static_cast<size_t>(current_ - buffer_); }
  
      // Not implemented
      void Put(Ch) { 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;
              }
          }
      }
  
      std::FILE* fp_;
      Ch *buffer_;
      size_t bufferSize_;
      Ch *bufferLast_;
      Ch *current_;
      size_t readCount_;
      size_t count_;  //!< Number of characters read
      bool eof_;
  };
  
  RAPIDJSON_NAMESPACE_END
  
  #ifdef __clang__
  RAPIDJSON_DIAG_POP
  #endif
  
  #endif // RAPIDJSON_FILESTREAM_H_