---
title: Endian conversion definitions
framework: IOKit
role: collectionGroup
role_heading: API Collection
path: iokit/usb_h_user-space/endian_conversion_definitions
---

# Endian conversion definitions

Public Interfaces to the USB implementation in macOS.

## Overview

Overview This header file contains definitions and structures that are used in the different USB API's in macOS, both in the kernel and in the user space.

## Topics

### Constants

- [HostToUSBLong](iokit/hosttousblong.md)
- [HostToUSBWord](iokit/hosttousbword.md)
- [USBToHostLong](iokit/usbtohostlong.md)
- [USBToHostWord](iokit/usbtohostword.md)