| // Copyright 2020 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 LIB_FIDL_LLCPP_ENVELOPE_H_ |
| #define LIB_FIDL_LLCPP_ENVELOPE_H_ |
| |
| #include <zircon/fidl.h> |
| |
| #include "tracking_ptr.h" |
| |
| namespace fidl { |
| |
| // Envelope is a typed version of fidl_envelope_t. |
| template <typename T> |
| struct Envelope { |
| // The size of the entire envelope contents, including any additional out-of-line objects that the |
| // envelope may contain. For example, a vector<string>'s num_bytes for ["hello", "world"] would |
| // include the string contents in the size, not just the outer vector. Always a multiple of 8; |
| // must be zero in transit if envelope is null. |
| uint32_t num_bytes; |
| |
| // The number of handles in the envelope, including any additional out-of-line objects that the |
| // envelope contains. Must be zero in transit if envelope is null. |
| uint32_t num_handles; |
| |
| // A pointer to the out-of-line envelope data. |
| tracking_ptr<T> data; |
| }; |
| |
| static_assert(sizeof(Envelope<void>) == sizeof(fidl_envelope_t), |
| "Envelope<T> must have the same size as fidl_envelope_t"); |
| static_assert(offsetof(Envelope<void>, num_bytes) == offsetof(fidl_envelope_t, num_bytes), |
| "num_bytes must have the same offset in Envelope<T> and fidl_envelope_t"); |
| static_assert(sizeof(Envelope<void>().num_bytes) == sizeof(fidl_envelope_t().num_bytes), |
| "num_bytes must have the same size in Envelope<T> and fidl_envelope_t"); |
| static_assert(offsetof(Envelope<void>, num_handles) == offsetof(fidl_envelope_t, num_handles), |
| "num_handles must have the same offset in Envelope<T> and fidl_envelope_t"); |
| static_assert(sizeof(Envelope<void>().num_handles) == sizeof(fidl_envelope_t().num_handles), |
| "num_handles must have the same size in Envelope<T> and fidl_envelope_t"); |
| static_assert(offsetof(Envelope<void>, data) == offsetof(fidl_envelope_t, data), |
| "data must have the same offset in Envelope<T> and fidl_envelope_t"); |
| static_assert(sizeof(Envelope<void>().data) == sizeof(fidl_envelope_t().data), |
| "data must have the same size in Envelope<T> and fidl_envelope_t"); |
| |
| } // namespace fidl |
| |
| #endif // LIB_FIDL_LLCPP_ENVELOPE_H_ |