# init(dst_ptr:dst_size:src_ptr:src_size:state:) Returns a new compression stream structure. ``` init(dst_ptr: UnsafeMutablePointer, dst_size: Int, src_ptr: UnsafePointer, src_size: Int, state: UnsafeMutableRawPointer?) ``` ## Parameters `dst_ptr` A pointer to the first byte of the destination buffer. `dst_size` The size, in bytes, on the destination buffer. `src_ptr` A pointer to the first byte of the source buffer. `src_size` The size, in bytes, on the source buffer. `state` The stream state object of the compression stream. You should not directly access this field. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)