// 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
|
|
//! Represents an in-memory output byte stream.
|
/*!
|
This class is mainly for being wrapped by EncodedOutputStream or AutoUTFOutputStream.
|
|
It is similar to FileWriteBuffer but the destination is an in-memory buffer instead of a file.
|
|
Differences between MemoryBuffer and StringBuffer:
|
1. StringBuffer has Encoding but MemoryBuffer is only a byte buffer.
|
2. StringBuffer::GetString() returns a null-terminated string. MemoryBuffer::GetBuffer() returns a buffer without terminator.
|
|
\tparam Allocator type for allocating memory buffer.
|
\note implements Stream concept
|
*/
|
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;
|
|
//! Implement specialized version of PutN() with memset() for better performance.
|
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_
|
