CFDataCreateWithBytescreated

CFDataCreateWithBytescreated is a function within the Core Foundation framework of Apple's operating systems, used for creating CFData objects. CFData is a data type that represents a sequence of bytes. This specific function is designed to create a CFData object from a block of memory and a specified length.

The function signature typically involves three parameters: a memory address (pointer to the byte data), the number of bytes in that memory block, and an optional allocator. The allocator parameter allows for custom memory management, but passing kCFAllocatorDefault is common for standard memory allocation.

When CFDataCreateWithBytescreated is called, it allocates memory for the new CFData object and copies the provided byte data into it. The ownership of the data is transferred to the CFData object, meaning that after creation, the original memory block is no longer the responsibility of the caller for management or deallocation, assuming the data was copied. If the data is not copied (which is not the typical behavior for this function without specific flags or different function variants), the caller would need to manage the original data's lifecycle.

CFData objects are immutable by default once created with this function. This means their contents cannot be modified after creation. This immutability can be beneficial for performance and thread safety. The function returns a reference to the newly created CFData object. Callers are responsible for releasing this object using CFRelease when it is no longer needed to prevent memory leaks.