memorystream.h

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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_MEMORYSTREAM_H_
#define RAPIDJSON_MEMORYSTREAM_H_

#include "stream.h"

#if __clang__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(unreachable - code)
RAPIDJSON_DIAG_OFF(missing - noreturn)
#endif

RAPIDJSON_NAMESPACE_BEGIN


struct MemoryStream
{
  typedef char Ch;  // byte

  MemoryStream(const Ch* src, size_t size) : src_(src), begin_(src), end_(src + size), size_(size)
  {
  }

  Ch Peek() const
  {
    return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_;
  }
  Ch Take()
  {
    return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_++;
  }
  size_t Tell() const
  {
    return static_cast<size_t>(src_ - begin_);
  }

  Ch* PutBegin()
  {
    RAPIDJSON_ASSERT(false);
    return 0;
  }
  void Put(Ch)
  {
    RAPIDJSON_ASSERT(false);
  }
  void Flush()
  {
    RAPIDJSON_ASSERT(false);
  }
  size_t PutEnd(Ch*)
  {
    RAPIDJSON_ASSERT(false);
    return 0;
  }

  // For encoding detection only.
  const Ch* Peek4() const
  {
    return Tell() + 4 <= size_ ? src_ : 0;
  }

  const Ch* src_;    
  const Ch* begin_;  
  const Ch* end_;    
  size_t size_;      
};

RAPIDJSON_NAMESPACE_END

#if __clang__
RAPIDJSON_DIAG_POP
#endif

#endif  // RAPIDJSON_MEMORYBUFFER_H_