Doug Horn | 1427b6a | 2018-12-11 13:19:16 -0800 | [diff] [blame] | 1 | // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "lib/fidl/cpp/encoder.h" |
| 6 | |
| 7 | #include <zircon/assert.h> |
| 8 | #include <zircon/fidl.h> |
| 9 | |
| 10 | namespace fidl { |
| 11 | namespace { |
| 12 | |
| 13 | size_t Align(size_t size) { |
| 14 | constexpr size_t alignment_mask = FIDL_ALIGNMENT - 1; |
| 15 | return (size + alignment_mask) & ~alignment_mask; |
| 16 | } |
| 17 | |
| 18 | } // namespace |
| 19 | |
| 20 | Encoder::Encoder(uint32_t ordinal) { EncodeMessageHeader(ordinal); } |
| 21 | |
| 22 | Encoder::~Encoder() = default; |
| 23 | |
| 24 | size_t Encoder::Alloc(size_t size) { |
| 25 | size_t offset = bytes_.size(); |
| 26 | size_t new_size = bytes_.size() + Align(size); |
| 27 | ZX_ASSERT(new_size >= offset); |
| 28 | bytes_.resize(new_size); |
| 29 | return offset; |
| 30 | } |
| 31 | |
| 32 | #ifdef __Fuchsia__ |
| 33 | void Encoder::EncodeHandle(zx::object_base* value, size_t offset) { |
| 34 | if (value->is_valid()) { |
| 35 | *GetPtr<zx_handle_t>(offset) = FIDL_HANDLE_PRESENT; |
| 36 | handles_.push_back(value->release()); |
| 37 | } else { |
| 38 | *GetPtr<zx_handle_t>(offset) = FIDL_HANDLE_ABSENT; |
| 39 | } |
| 40 | } |
| 41 | #endif |
| 42 | |
| 43 | Message Encoder::GetMessage() { |
| 44 | return Message(BytePart(bytes_.data(), bytes_.size(), bytes_.size()), |
| 45 | HandlePart(handles_.data(), handles_.size(), handles_.size())); |
| 46 | } |
| 47 | |
| 48 | void Encoder::Reset(uint32_t ordinal) { |
| 49 | bytes_.clear(); |
| 50 | handles_.clear(); |
| 51 | EncodeMessageHeader(ordinal); |
| 52 | } |
| 53 | |
| 54 | void Encoder::EncodeMessageHeader(uint32_t ordinal) { |
| 55 | size_t offset = Alloc(sizeof(fidl_message_header_t)); |
| 56 | fidl_message_header_t* header = GetPtr<fidl_message_header_t>(offset); |
| 57 | header->ordinal = ordinal; |
| 58 | } |
| 59 | |
| 60 | } // namespace fidl |