Function malloc_and_copy_bytes 

pub unsafe fn malloc_and_copy_bytes(data: &[u8], out_len: *mut usize) -> *mut u8

Helper to allocate memory via malloc, copy Rust slice data into it, set the out_len pointer, and return the raw pointer. Returns null pointer on allocation failure.

Safety

• out_len must be a valid pointer to usize.
• The caller must ensure the returned pointer (if not null) is eventually freed using ffi_free_bytes.
• Operations involve raw pointers and calling libc::malloc, requiring unsafe block.