GlobalBufferMemoryManager

The GlobalBufferMemoryManager class is a sophisticated memory management utility designed to handle dynamic memory allocation within a predefined global buffer. This manager optimizes memory usage by maintaining a free list of memory blocks, allowing for efficient allocation, deallocation, and resizing of memory segments.

Key Features:

• Custom memory allocator within a global buffer.

• Free list management for tracking available memory blocks.

• Support for allocation, deallocation, and resizing of memory blocks.

• Functions to retrieve total free memory and the size of the largest free block.

• Debugging capabilities to monitor memory operations and detect corruption.

Methods:

• static void initialize() Initializes the memory manager by setting up the free list to cover the entire global buffer.

• static void* allocate(size_t size) Allocates a block of memory of the specified size from the global buffer. Returns pointer to the allocated memory block if successful or nullptr if the allocation fails due to insufficient memory.

• static void deallocate(void* ptr) Deallocates a previously allocated block of memory, returning it to the free list.

• static void* reallocate(void* ptr, size_t newSize) Resizes a previously allocated memory block to a new size. Returns pointer to the resized memory block if successful or nullptr if the reallocation fails.

• static size_t getTotalFreeMemory() Retrieves the total amount of free memory available in the global buffer.

• static size_t getLargestFreeBlock() Retrieves the size of the largest contiguous free memory block in the global buffer.

Private Members:

• struct FreeBlock A structure representing a free memory block within the global buffer.

  • size_t size Size of the free block in bytes.

  • FreeBlock* next Pointer to the next free block in the free list.

• static constexpr bool DEBUG A compile-time flag for enabling or disabling debug logging within the memory manager. Default value: false

• static constexpr size_t BUFFER_SIZE Defines the size of the global buffer in bytes. Default value: 4096

• static uint8_t mGlobalBuffer[BUFFER_SIZE] The global buffer used for memory allocations.

• static FreeBlock* mFreeList Pointer to the head of the free list, managing available memory blocks.

Private Methods:

• size_t alignSize(size_t size) Aligns the requested size to a 4-byte boundary.

• bool _isPtrEqual(cn_cbor *cb, const void *ptr) const Checks if a given pointer is equal to the data pointer of a CBOR node.

• void _markAsDirty(bool updated) Marks the memory manager's state as dirty if an update occurs.