CFDataReplaceBytesCFMutableDataRef

CFDataReplaceB is a function within the Core Foundation framework of Apple's operating systems. Its primary purpose is to create a new data object by replacing a portion of an existing data object with new data. This function operates on CFData objects, which are immutable byte buffers used for storing raw data.

The function signature typically involves parameters for the original data object, the range within the original data to be replaced, and the new data object containing the replacement bytes. When called, CFDataReplaceB constructs a new CFData object. This new object will contain the bytes from the original data object up to the start of the specified replacement range. Following this, it inserts the bytes from the new data object. Finally, it appends the remaining bytes from the original data object that were after the specified replacement range. The original data object remains unchanged; CFData objects are immutable. This operation is useful for scenarios where modifications to data are needed without altering the original source, promoting data integrity and predictability.