src/connectivity/wlan/lib/common/cpp/include/wlan/common/from_bytes.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SRC_CONNECTIVITY_WLAN_LIB_COMMON_CPP_INCLUDE_WLAN_COMMON_FROM_BYTES_H_
#define SRC_CONNECTIVITY_WLAN_LIB_COMMON_CPP_INCLUDE_WLAN_COMMON_FROM_BYTES_H_

#include <lib/stdcompat/span.h>

#include <cstdint>

namespace wlan {
template <typename T>
T* FromBytes(uint8_t* buf, size_t len) {
  if (len < sizeof(T))
    return nullptr;
  return reinterpret_cast<T*>(buf);
}

template <typename T>
const T* FromBytes(const uint8_t* buf, size_t len) {
  if (len < sizeof(T))
    return nullptr;
  return reinterpret_cast<const T*>(buf);
}

template <typename T>
const T* FromBytes(cpp20::span<const uint8_t> bytes) {
  if (bytes.size() < sizeof(T))
    return nullptr;
  return reinterpret_cast<const T*>(bytes.data());
}
}  // namespace wlan

#endif  // SRC_CONNECTIVITY_WLAN_LIB_COMMON_CPP_INCLUDE_WLAN_COMMON_FROM_BYTES_H_