| ptr1 | 指向第一个内存缓冲区的指针。 |
| ptr2 | Pointer to the second memory buffer to swap the first one with. |
| size | Number of bytes to swap. |
Swap the content of two memory buffers of the same size.
MemSwap copies the data correctly when ptr1 and ptr2 buffers are overlapping, with the content of ptr1 in the overlapped region.