memorybuffer.h

// 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_MEMORYBUFFER_H_
#define RAPIDJSON_MEMORYBUFFER_H_
 
#include "stream.h"
#include "internal/stack.h"
 
RAPIDJSON_NAMESPACE_BEGIN
 
 
template <typename Allocator = CrtAllocator>
struct GenericMemoryBuffer {
    typedef char Ch; // byte
 
    GenericMemoryBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {}
 
    void Put(Ch c) { *stack_.template Push<Ch>() = c; }
    void Flush() {}
 
    void Clear() { stack_.Clear(); }
    void ShrinkToFit() { stack_.ShrinkToFit(); }
    Ch* Push(size_t count) { return stack_.template Push<Ch>(count); }
    void Pop(size_t count) { stack_.template Pop<Ch>(count); }
 
    const Ch* GetBuffer() const {
        return stack_.template Bottom<Ch>();
    }
 
    size_t GetSize() const { return stack_.GetSize(); }
 
    static const size_t kDefaultCapacity = 256;
    mutable internal::Stack<Allocator> stack_;
};
 
typedef GenericMemoryBuffer<> MemoryBuffer;
 
template<>
inline void PutN(MemoryBuffer& memoryBuffer, char c, size_t n) {
    std::memset(memoryBuffer.stack_.Push<char>(n), c, n * sizeof(c));
}
 
RAPIDJSON_NAMESPACE_END
 
#endif // RAPIDJSON_MEMORYBUFFER_H_