| // Copyright (C) 2011 Milo Yip |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| #ifndef RAPIDJSON_MEMORYBUFFER_H_ |
| #define RAPIDJSON_MEMORYBUFFER_H_ |
| |
| #include "rapidjson.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_ |