Maxim Integrated / Mbed OS MAXREFDES155#

DeepCover Embedded Security in IoT: Public-key Secured Data Paths

Dependencies:   MaximInterface

The MAXREFDES155# is an internet-of-things (IoT) embedded-security reference design, built to authenticate and control a sensing node using elliptic-curve-based public-key cryptography with control and notification from a web server.

The hardware includes an ARM® mbed™ shield and attached sensor endpoint. The shield contains a DS2476 DeepCover® ECDSA/SHA-2 coprocessor, Wifi communication, LCD push-button controls, and status LEDs. The sensor endpoint is attached to the shield using a 300mm cable and contains a DS28C36 DeepCover ECDSA/SHA-2 authenticator, IR-thermal sensor, and aiming laser for the IR sensor. The MAXREFDES155# is equipped with a standard Arduino® form-factor shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The combination of these two devices represent an IoT device. Communication to the web server is accomplished with the shield Wifi circuitry. Communication from the shield to the attached sensor module is accomplished over I2C . The sensor module represents an IoT endpoint that generates small data with a requirement for message authenticity/integrity and secure on/off operational control.

The design is hierarchical with each mbed platform and shield communicating data from the sensor node to a web server that maintains a centralized log and dispatches notifications as necessary. The simplicity of this design enables rapid integration into any star-topology IoT network to provide security with the low overhead and cost provided by the ECDSA-P256 asymmetric-key and SHA-256 symmetric-key algorithms.

More information about the MAXREFDES155# is available on the Maxim Integrated website.

rapidjson/allocators.h@15:75404fab3615, 2018-01-19 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Jan 19 10:28:27 2018 -0600
Revision:
15:75404fab3615
Parent:
0:33d4e66780c0 
Updated MaximInterface revision.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 // Tencent is pleased to support the open source community by making RapidJSON available.
IanBenzMaxim 0:33d4e66780c0 2 //
IanBenzMaxim 0:33d4e66780c0 3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
IanBenzMaxim 0:33d4e66780c0 4 //
IanBenzMaxim 0:33d4e66780c0 5 // Licensed under the MIT License (the "License"); you may not use this file except
IanBenzMaxim 0:33d4e66780c0 6 // in compliance with the License. You may obtain a copy of the License at
IanBenzMaxim 0:33d4e66780c0 7 //
IanBenzMaxim 0:33d4e66780c0 8 // http://opensource.org/licenses/MIT
IanBenzMaxim 0:33d4e66780c0 9 //
IanBenzMaxim 0:33d4e66780c0 10 // Unless required by applicable law or agreed to in writing, software distributed
IanBenzMaxim 0:33d4e66780c0 11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
IanBenzMaxim 0:33d4e66780c0 12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
IanBenzMaxim 0:33d4e66780c0 13 // specific language governing permissions and limitations under the License.
IanBenzMaxim 0:33d4e66780c0 14
IanBenzMaxim 0:33d4e66780c0 15 #ifndef RAPIDJSON_ALLOCATORS_H_
IanBenzMaxim 0:33d4e66780c0 16 #define RAPIDJSON_ALLOCATORS_H_
IanBenzMaxim 0:33d4e66780c0 17
IanBenzMaxim 0:33d4e66780c0 18 #include "rapidjson.h"
IanBenzMaxim 0:33d4e66780c0 19
IanBenzMaxim 0:33d4e66780c0 20 RAPIDJSON_NAMESPACE_BEGIN
IanBenzMaxim 0:33d4e66780c0 21
IanBenzMaxim 0:33d4e66780c0 22 ///////////////////////////////////////////////////////////////////////////////
IanBenzMaxim 0:33d4e66780c0 23 // Allocator
IanBenzMaxim 0:33d4e66780c0 24
IanBenzMaxim 0:33d4e66780c0 25 /*! \class rapidjson::Allocator
IanBenzMaxim 0:33d4e66780c0 26 \brief Concept for allocating, resizing and freeing memory block.
IanBenzMaxim 0:33d4e66780c0 27
IanBenzMaxim 0:33d4e66780c0 28 Note that Malloc() and Realloc() are non-static but Free() is static.
IanBenzMaxim 0:33d4e66780c0 29
IanBenzMaxim 0:33d4e66780c0 30 So if an allocator need to support Free(), it needs to put its pointer in
IanBenzMaxim 0:33d4e66780c0 31 the header of memory block.
IanBenzMaxim 0:33d4e66780c0 32
IanBenzMaxim 0:33d4e66780c0 33 \code
IanBenzMaxim 0:33d4e66780c0 34 concept Allocator {
IanBenzMaxim 0:33d4e66780c0 35 static const bool kNeedFree; //!< Whether this allocator needs to call Free().
IanBenzMaxim 0:33d4e66780c0 36
IanBenzMaxim 0:33d4e66780c0 37 // Allocate a memory block.
IanBenzMaxim 0:33d4e66780c0 38 // \param size of the memory block in bytes.
IanBenzMaxim 0:33d4e66780c0 39 // \returns pointer to the memory block.
IanBenzMaxim 0:33d4e66780c0 40 void* Malloc(size_t size);
IanBenzMaxim 0:33d4e66780c0 41
IanBenzMaxim 0:33d4e66780c0 42 // Resize a memory block.
IanBenzMaxim 0:33d4e66780c0 43 // \param originalPtr The pointer to current memory block. Null pointer is permitted.
IanBenzMaxim 0:33d4e66780c0 44 // \param originalSize The current size in bytes. (Design issue: since some allocator may not book-keep this, explicitly pass to it can save memory.)
IanBenzMaxim 0:33d4e66780c0 45 // \param newSize the new size in bytes.
IanBenzMaxim 0:33d4e66780c0 46 void* Realloc(void* originalPtr, size_t originalSize, size_t newSize);
IanBenzMaxim 0:33d4e66780c0 47
IanBenzMaxim 0:33d4e66780c0 48 // Free a memory block.
IanBenzMaxim 0:33d4e66780c0 49 // \param pointer to the memory block. Null pointer is permitted.
IanBenzMaxim 0:33d4e66780c0 50 static void Free(void *ptr);
IanBenzMaxim 0:33d4e66780c0 51 };
IanBenzMaxim 0:33d4e66780c0 52 \endcode
IanBenzMaxim 0:33d4e66780c0 53 */
IanBenzMaxim 0:33d4e66780c0 54
IanBenzMaxim 0:33d4e66780c0 55 ///////////////////////////////////////////////////////////////////////////////
IanBenzMaxim 0:33d4e66780c0 56 // CrtAllocator
IanBenzMaxim 0:33d4e66780c0 57
IanBenzMaxim 0:33d4e66780c0 58 //! C-runtime library allocator.
IanBenzMaxim 0:33d4e66780c0 59 /*! This class is just wrapper for standard C library memory routines.
IanBenzMaxim 0:33d4e66780c0 60 \note implements Allocator concept
IanBenzMaxim 0:33d4e66780c0 61 */
IanBenzMaxim 0:33d4e66780c0 62 class CrtAllocator {
IanBenzMaxim 0:33d4e66780c0 63 public:
IanBenzMaxim 0:33d4e66780c0 64 static const bool kNeedFree = true;
IanBenzMaxim 0:33d4e66780c0 65 void* Malloc(size_t size) {
IanBenzMaxim 0:33d4e66780c0 66 if (size) // behavior of malloc(0) is implementation defined.
IanBenzMaxim 0:33d4e66780c0 67 return std::malloc(size);
IanBenzMaxim 0:33d4e66780c0 68 else
IanBenzMaxim 0:33d4e66780c0 69 return NULL; // standardize to returning NULL.
IanBenzMaxim 0:33d4e66780c0 70 }
IanBenzMaxim 0:33d4e66780c0 71 void* Realloc(void* originalPtr, size_t originalSize, size_t newSize) {
IanBenzMaxim 0:33d4e66780c0 72 (void)originalSize;
IanBenzMaxim 0:33d4e66780c0 73 if (newSize == 0) {
IanBenzMaxim 0:33d4e66780c0 74 std::free(originalPtr);
IanBenzMaxim 0:33d4e66780c0 75 return NULL;
IanBenzMaxim 0:33d4e66780c0 76 }
IanBenzMaxim 0:33d4e66780c0 77 return std::realloc(originalPtr, newSize);
IanBenzMaxim 0:33d4e66780c0 78 }
IanBenzMaxim 0:33d4e66780c0 79 static void Free(void *ptr) { std::free(ptr); }
IanBenzMaxim 0:33d4e66780c0 80 };
IanBenzMaxim 0:33d4e66780c0 81
IanBenzMaxim 0:33d4e66780c0 82 ///////////////////////////////////////////////////////////////////////////////
IanBenzMaxim 0:33d4e66780c0 83 // MemoryPoolAllocator
IanBenzMaxim 0:33d4e66780c0 84
IanBenzMaxim 0:33d4e66780c0 85 //! Default memory allocator used by the parser and DOM.
IanBenzMaxim 0:33d4e66780c0 86 /*! This allocator allocate memory blocks from pre-allocated memory chunks.
IanBenzMaxim 0:33d4e66780c0 87
IanBenzMaxim 0:33d4e66780c0 88 It does not free memory blocks. And Realloc() only allocate new memory.
IanBenzMaxim 0:33d4e66780c0 89
IanBenzMaxim 0:33d4e66780c0 90 The memory chunks are allocated by BaseAllocator, which is CrtAllocator by default.
IanBenzMaxim 0:33d4e66780c0 91
IanBenzMaxim 0:33d4e66780c0 92 User may also supply a buffer as the first chunk.
IanBenzMaxim 0:33d4e66780c0 93
IanBenzMaxim 0:33d4e66780c0 94 If the user-buffer is full then additional chunks are allocated by BaseAllocator.
IanBenzMaxim 0:33d4e66780c0 95
IanBenzMaxim 0:33d4e66780c0 96 The user-buffer is not deallocated by this allocator.
IanBenzMaxim 0:33d4e66780c0 97
IanBenzMaxim 0:33d4e66780c0 98 \tparam BaseAllocator the allocator type for allocating memory chunks. Default is CrtAllocator.
IanBenzMaxim 0:33d4e66780c0 99 \note implements Allocator concept
IanBenzMaxim 0:33d4e66780c0 100 */
IanBenzMaxim 0:33d4e66780c0 101 template <typename BaseAllocator = CrtAllocator>
IanBenzMaxim 0:33d4e66780c0 102 class MemoryPoolAllocator {
IanBenzMaxim 0:33d4e66780c0 103 public:
IanBenzMaxim 0:33d4e66780c0 104 static const bool kNeedFree = false; //!< Tell users that no need to call Free() with this allocator. (concept Allocator)
IanBenzMaxim 0:33d4e66780c0 105
IanBenzMaxim 0:33d4e66780c0 106 //! Constructor with chunkSize.
IanBenzMaxim 0:33d4e66780c0 107 /*! \param chunkSize The size of memory chunk. The default is kDefaultChunkSize.
IanBenzMaxim 0:33d4e66780c0 108 \param baseAllocator The allocator for allocating memory chunks.
IanBenzMaxim 0:33d4e66780c0 109 */
IanBenzMaxim 0:33d4e66780c0 110 MemoryPoolAllocator(size_t chunkSize = kDefaultChunkCapacity, BaseAllocator* baseAllocator = 0) :
IanBenzMaxim 0:33d4e66780c0 111 chunkHead_(0), chunk_capacity_(chunkSize), userBuffer_(0), baseAllocator_(baseAllocator), ownBaseAllocator_(0)
IanBenzMaxim 0:33d4e66780c0 112 {
IanBenzMaxim 0:33d4e66780c0 113 }
IanBenzMaxim 0:33d4e66780c0 114
IanBenzMaxim 0:33d4e66780c0 115 //! Constructor with user-supplied buffer.
IanBenzMaxim 0:33d4e66780c0 116 /*! The user buffer will be used firstly. When it is full, memory pool allocates new chunk with chunk size.
IanBenzMaxim 0:33d4e66780c0 117
IanBenzMaxim 0:33d4e66780c0 118 The user buffer will not be deallocated when this allocator is destructed.
IanBenzMaxim 0:33d4e66780c0 119
IanBenzMaxim 0:33d4e66780c0 120 \param buffer User supplied buffer.
IanBenzMaxim 0:33d4e66780c0 121 \param size Size of the buffer in bytes. It must at least larger than sizeof(ChunkHeader).
IanBenzMaxim 0:33d4e66780c0 122 \param chunkSize The size of memory chunk. The default is kDefaultChunkSize.
IanBenzMaxim 0:33d4e66780c0 123 \param baseAllocator The allocator for allocating memory chunks.
IanBenzMaxim 0:33d4e66780c0 124 */
IanBenzMaxim 0:33d4e66780c0 125 MemoryPoolAllocator(void *buffer, size_t size, size_t chunkSize = kDefaultChunkCapacity, BaseAllocator* baseAllocator = 0) :
IanBenzMaxim 0:33d4e66780c0 126 chunkHead_(0), chunk_capacity_(chunkSize), userBuffer_(buffer), baseAllocator_(baseAllocator), ownBaseAllocator_(0)
IanBenzMaxim 0:33d4e66780c0 127 {
IanBenzMaxim 0:33d4e66780c0 128 RAPIDJSON_ASSERT(buffer != 0);
IanBenzMaxim 0:33d4e66780c0 129 RAPIDJSON_ASSERT(size > sizeof(ChunkHeader));
IanBenzMaxim 0:33d4e66780c0 130 chunkHead_ = reinterpret_cast<ChunkHeader*>(buffer);
IanBenzMaxim 0:33d4e66780c0 131 chunkHead_->capacity = size - sizeof(ChunkHeader);
IanBenzMaxim 0:33d4e66780c0 132 chunkHead_->size = 0;
IanBenzMaxim 0:33d4e66780c0 133 chunkHead_->next = 0;
IanBenzMaxim 0:33d4e66780c0 134 }
IanBenzMaxim 0:33d4e66780c0 135
IanBenzMaxim 0:33d4e66780c0 136 //! Destructor.
IanBenzMaxim 0:33d4e66780c0 137 /*! This deallocates all memory chunks, excluding the user-supplied buffer.
IanBenzMaxim 0:33d4e66780c0 138 */
IanBenzMaxim 0:33d4e66780c0 139 ~MemoryPoolAllocator() {
IanBenzMaxim 0:33d4e66780c0 140 Clear();
IanBenzMaxim 0:33d4e66780c0 141 RAPIDJSON_DELETE(ownBaseAllocator_);
IanBenzMaxim 0:33d4e66780c0 142 }
IanBenzMaxim 0:33d4e66780c0 143
IanBenzMaxim 0:33d4e66780c0 144 //! Deallocates all memory chunks, excluding the user-supplied buffer.
IanBenzMaxim 0:33d4e66780c0 145 void Clear() {
IanBenzMaxim 0:33d4e66780c0 146 while (chunkHead_ && chunkHead_ != userBuffer_) {
IanBenzMaxim 0:33d4e66780c0 147 ChunkHeader* next = chunkHead_->next;
IanBenzMaxim 0:33d4e66780c0 148 baseAllocator_->Free(chunkHead_);
IanBenzMaxim 0:33d4e66780c0 149 chunkHead_ = next;
IanBenzMaxim 0:33d4e66780c0 150 }
IanBenzMaxim 0:33d4e66780c0 151 if (chunkHead_ && chunkHead_ == userBuffer_)
IanBenzMaxim 0:33d4e66780c0 152 chunkHead_->size = 0; // Clear user buffer
IanBenzMaxim 0:33d4e66780c0 153 }
IanBenzMaxim 0:33d4e66780c0 154
IanBenzMaxim 0:33d4e66780c0 155 //! Computes the total capacity of allocated memory chunks.
IanBenzMaxim 0:33d4e66780c0 156 /*! \return total capacity in bytes.
IanBenzMaxim 0:33d4e66780c0 157 */
IanBenzMaxim 0:33d4e66780c0 158 size_t Capacity() const {
IanBenzMaxim 0:33d4e66780c0 159 size_t capacity = 0;
IanBenzMaxim 0:33d4e66780c0 160 for (ChunkHeader* c = chunkHead_; c != 0; c = c->next)
IanBenzMaxim 0:33d4e66780c0 161 capacity += c->capacity;
IanBenzMaxim 0:33d4e66780c0 162 return capacity;
IanBenzMaxim 0:33d4e66780c0 163 }
IanBenzMaxim 0:33d4e66780c0 164
IanBenzMaxim 0:33d4e66780c0 165 //! Computes the memory blocks allocated.
IanBenzMaxim 0:33d4e66780c0 166 /*! \return total used bytes.
IanBenzMaxim 0:33d4e66780c0 167 */
IanBenzMaxim 0:33d4e66780c0 168 size_t Size() const {
IanBenzMaxim 0:33d4e66780c0 169 size_t size = 0;
IanBenzMaxim 0:33d4e66780c0 170 for (ChunkHeader* c = chunkHead_; c != 0; c = c->next)
IanBenzMaxim 0:33d4e66780c0 171 size += c->size;
IanBenzMaxim 0:33d4e66780c0 172 return size;
IanBenzMaxim 0:33d4e66780c0 173 }
IanBenzMaxim 0:33d4e66780c0 174
IanBenzMaxim 0:33d4e66780c0 175 //! Allocates a memory block. (concept Allocator)
IanBenzMaxim 0:33d4e66780c0 176 void* Malloc(size_t size) {
IanBenzMaxim 0:33d4e66780c0 177 if (!size)
IanBenzMaxim 0:33d4e66780c0 178 return NULL;
IanBenzMaxim 0:33d4e66780c0 179
IanBenzMaxim 0:33d4e66780c0 180 size = RAPIDJSON_ALIGN(size);
IanBenzMaxim 0:33d4e66780c0 181 if (chunkHead_ == 0 || chunkHead_->size + size > chunkHead_->capacity)
IanBenzMaxim 0:33d4e66780c0 182 if (!AddChunk(chunk_capacity_ > size ? chunk_capacity_ : size))
IanBenzMaxim 0:33d4e66780c0 183 return NULL;
IanBenzMaxim 0:33d4e66780c0 184
IanBenzMaxim 0:33d4e66780c0 185 void *buffer = reinterpret_cast<char *>(chunkHead_) + RAPIDJSON_ALIGN(sizeof(ChunkHeader)) + chunkHead_->size;
IanBenzMaxim 0:33d4e66780c0 186 chunkHead_->size += size;
IanBenzMaxim 0:33d4e66780c0 187 return buffer;
IanBenzMaxim 0:33d4e66780c0 188 }
IanBenzMaxim 0:33d4e66780c0 189
IanBenzMaxim 0:33d4e66780c0 190 //! Resizes a memory block (concept Allocator)
IanBenzMaxim 0:33d4e66780c0 191 void* Realloc(void* originalPtr, size_t originalSize, size_t newSize) {
IanBenzMaxim 0:33d4e66780c0 192 if (originalPtr == 0)
IanBenzMaxim 0:33d4e66780c0 193 return Malloc(newSize);
IanBenzMaxim 0:33d4e66780c0 194
IanBenzMaxim 0:33d4e66780c0 195 if (newSize == 0)
IanBenzMaxim 0:33d4e66780c0 196 return NULL;
IanBenzMaxim 0:33d4e66780c0 197
IanBenzMaxim 0:33d4e66780c0 198 originalSize = RAPIDJSON_ALIGN(originalSize);
IanBenzMaxim 0:33d4e66780c0 199 newSize = RAPIDJSON_ALIGN(newSize);
IanBenzMaxim 0:33d4e66780c0 200
IanBenzMaxim 0:33d4e66780c0 201 // Do not shrink if new size is smaller than original
IanBenzMaxim 0:33d4e66780c0 202 if (originalSize >= newSize)
IanBenzMaxim 0:33d4e66780c0 203 return originalPtr;
IanBenzMaxim 0:33d4e66780c0 204
IanBenzMaxim 0:33d4e66780c0 205 // Simply expand it if it is the last allocation and there is sufficient space
IanBenzMaxim 0:33d4e66780c0 206 if (originalPtr == reinterpret_cast<char *>(chunkHead_) + RAPIDJSON_ALIGN(sizeof(ChunkHeader)) + chunkHead_->size - originalSize) {
IanBenzMaxim 0:33d4e66780c0 207 size_t increment = static_cast<size_t>(newSize - originalSize);
IanBenzMaxim 0:33d4e66780c0 208 if (chunkHead_->size + increment <= chunkHead_->capacity) {
IanBenzMaxim 0:33d4e66780c0 209 chunkHead_->size += increment;
IanBenzMaxim 0:33d4e66780c0 210 return originalPtr;
IanBenzMaxim 0:33d4e66780c0 211 }
IanBenzMaxim 0:33d4e66780c0 212 }
IanBenzMaxim 0:33d4e66780c0 213
IanBenzMaxim 0:33d4e66780c0 214 // Realloc process: allocate and copy memory, do not free original buffer.
IanBenzMaxim 0:33d4e66780c0 215 if (void* newBuffer = Malloc(newSize)) {
IanBenzMaxim 0:33d4e66780c0 216 if (originalSize)
IanBenzMaxim 0:33d4e66780c0 217 std::memcpy(newBuffer, originalPtr, originalSize);
IanBenzMaxim 0:33d4e66780c0 218 return newBuffer;
IanBenzMaxim 0:33d4e66780c0 219 }
IanBenzMaxim 0:33d4e66780c0 220 else
IanBenzMaxim 0:33d4e66780c0 221 return NULL;
IanBenzMaxim 0:33d4e66780c0 222 }
IanBenzMaxim 0:33d4e66780c0 223
IanBenzMaxim 0:33d4e66780c0 224 //! Frees a memory block (concept Allocator)
IanBenzMaxim 0:33d4e66780c0 225 static void Free(void *ptr) { (void)ptr; } // Do nothing
IanBenzMaxim 0:33d4e66780c0 226
IanBenzMaxim 0:33d4e66780c0 227 private:
IanBenzMaxim 0:33d4e66780c0 228 //! Copy constructor is not permitted.
IanBenzMaxim 0:33d4e66780c0 229 MemoryPoolAllocator(const MemoryPoolAllocator& rhs) /* = delete */;
IanBenzMaxim 0:33d4e66780c0 230 //! Copy assignment operator is not permitted.
IanBenzMaxim 0:33d4e66780c0 231 MemoryPoolAllocator& operator=(const MemoryPoolAllocator& rhs) /* = delete */;
IanBenzMaxim 0:33d4e66780c0 232
IanBenzMaxim 0:33d4e66780c0 233 //! Creates a new chunk.
IanBenzMaxim 0:33d4e66780c0 234 /*! \param capacity Capacity of the chunk in bytes.
IanBenzMaxim 0:33d4e66780c0 235 \return true if success.
IanBenzMaxim 0:33d4e66780c0 236 */
IanBenzMaxim 0:33d4e66780c0 237 bool AddChunk(size_t capacity) {
IanBenzMaxim 0:33d4e66780c0 238 if (!baseAllocator_)
IanBenzMaxim 0:33d4e66780c0 239 ownBaseAllocator_ = baseAllocator_ = RAPIDJSON_NEW(BaseAllocator());
IanBenzMaxim 0:33d4e66780c0 240 if (ChunkHeader* chunk = reinterpret_cast<ChunkHeader*>(baseAllocator_->Malloc(RAPIDJSON_ALIGN(sizeof(ChunkHeader)) + capacity))) {
IanBenzMaxim 0:33d4e66780c0 241 chunk->capacity = capacity;
IanBenzMaxim 0:33d4e66780c0 242 chunk->size = 0;
IanBenzMaxim 0:33d4e66780c0 243 chunk->next = chunkHead_;
IanBenzMaxim 0:33d4e66780c0 244 chunkHead_ = chunk;
IanBenzMaxim 0:33d4e66780c0 245 return true;
IanBenzMaxim 0:33d4e66780c0 246 }
IanBenzMaxim 0:33d4e66780c0 247 else
IanBenzMaxim 0:33d4e66780c0 248 return false;
IanBenzMaxim 0:33d4e66780c0 249 }
IanBenzMaxim 0:33d4e66780c0 250
IanBenzMaxim 0:33d4e66780c0 251 static const int kDefaultChunkCapacity = 64 * 1024; //!< Default chunk capacity.
IanBenzMaxim 0:33d4e66780c0 252
IanBenzMaxim 0:33d4e66780c0 253 //! Chunk header for perpending to each chunk.
IanBenzMaxim 0:33d4e66780c0 254 /*! Chunks are stored as a singly linked list.
IanBenzMaxim 0:33d4e66780c0 255 */
IanBenzMaxim 0:33d4e66780c0 256 struct ChunkHeader {
IanBenzMaxim 0:33d4e66780c0 257 size_t capacity; //!< Capacity of the chunk in bytes (excluding the header itself).
IanBenzMaxim 0:33d4e66780c0 258 size_t size; //!< Current size of allocated memory in bytes.
IanBenzMaxim 0:33d4e66780c0 259 ChunkHeader *next; //!< Next chunk in the linked list.
IanBenzMaxim 0:33d4e66780c0 260 };
IanBenzMaxim 0:33d4e66780c0 261
IanBenzMaxim 0:33d4e66780c0 262 ChunkHeader *chunkHead_; //!< Head of the chunk linked-list. Only the head chunk serves allocation.
IanBenzMaxim 0:33d4e66780c0 263 size_t chunk_capacity_; //!< The minimum capacity of chunk when they are allocated.
IanBenzMaxim 0:33d4e66780c0 264 void *userBuffer_; //!< User supplied buffer.
IanBenzMaxim 0:33d4e66780c0 265 BaseAllocator* baseAllocator_; //!< base allocator for allocating memory chunks.
IanBenzMaxim 0:33d4e66780c0 266 BaseAllocator* ownBaseAllocator_; //!< base allocator created by this object.
IanBenzMaxim 0:33d4e66780c0 267 };
IanBenzMaxim 0:33d4e66780c0 268
IanBenzMaxim 0:33d4e66780c0 269 RAPIDJSON_NAMESPACE_END
IanBenzMaxim 0:33d4e66780c0 270
IanBenzMaxim 0:33d4e66780c0 271 #endif // RAPIDJSON_ENCODINGS_H_