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| 1 // Copyright 2013 The Chromium 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 "mojo/public/cpp/bindings/lib/bindings_serialization.h" | |
| 6 | |
| 7 #include "mojo/public/cpp/environment/logging.h" | |
| 8 | |
| 9 namespace mojo { | |
| 10 namespace internal { | |
| 11 | |
| 12 namespace { | |
| 13 | |
| 14 const size_t kAlignment = 8; | |
| 15 | |
| 16 template <typename T> | |
| 17 T AlignImpl(T t) { | |
| 18 return t + (kAlignment - (t % kAlignment)) % kAlignment; | |
| 19 } | |
| 20 | |
| 21 } // namespace | |
| 22 | |
| 23 size_t Align(size_t size) { | |
| 24 return AlignImpl(size); | |
| 25 } | |
| 26 | |
| 27 char* AlignPointer(char* ptr) { | |
| 28 return reinterpret_cast<char*>(AlignImpl(reinterpret_cast<uintptr_t>(ptr))); | |
| 29 } | |
| 30 | |
| 31 bool IsAligned(const void* ptr) { | |
| 32 return !(reinterpret_cast<uintptr_t>(ptr) % kAlignment); | |
| 33 } | |
| 34 | |
| 35 void EncodePointer(const void* ptr, uint64_t* offset) { | |
| 36 if (!ptr) { | |
| 37 *offset = 0; | |
| 38 return; | |
| 39 } | |
| 40 | |
| 41 const char* p_obj = reinterpret_cast<const char*>(ptr); | |
| 42 const char* p_slot = reinterpret_cast<const char*>(offset); | |
| 43 MOJO_DCHECK(p_obj > p_slot); | |
| 44 | |
| 45 *offset = static_cast<uint64_t>(p_obj - p_slot); | |
| 46 } | |
| 47 | |
| 48 const void* DecodePointerRaw(const uint64_t* offset) { | |
| 49 if (!*offset) | |
| 50 return nullptr; | |
| 51 return reinterpret_cast<const char*>(offset) + *offset; | |
| 52 } | |
| 53 | |
| 54 void EncodeHandle(Handle* handle, std::vector<Handle>* handles) { | |
| 55 if (handle->is_valid()) { | |
| 56 handles->push_back(*handle); | |
| 57 handle->set_value(static_cast<MojoHandle>(handles->size() - 1)); | |
| 58 } else { | |
| 59 handle->set_value(kEncodedInvalidHandleValue); | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 void EncodeHandle(Interface_Data* data, std::vector<Handle>* handles) { | |
| 64 EncodeHandle(&data->handle, handles); | |
| 65 } | |
| 66 | |
| 67 void EncodeHandle(MojoHandle* handle, std::vector<Handle>* handles) { | |
| 68 EncodeHandle(reinterpret_cast<Handle*>(handle), handles); | |
| 69 } | |
| 70 | |
| 71 void DecodeHandle(Handle* handle, std::vector<Handle>* handles) { | |
| 72 if (handle->value() == kEncodedInvalidHandleValue) { | |
| 73 *handle = Handle(); | |
| 74 return; | |
| 75 } | |
| 76 MOJO_DCHECK(handle->value() < handles->size()); | |
| 77 // Just leave holes in the vector so we don't screw up other indices. | |
| 78 *handle = FetchAndReset(&handles->at(handle->value())); | |
| 79 } | |
| 80 | |
| 81 void DecodeHandle(Interface_Data* data, std::vector<Handle>* handles) { | |
| 82 DecodeHandle(&data->handle, handles); | |
| 83 } | |
| 84 | |
| 85 void DecodeHandle(MojoHandle* handle, std::vector<Handle>* handles) { | |
| 86 DecodeHandle(reinterpret_cast<Handle*>(handle), handles); | |
| 87 } | |
| 88 | |
| 89 } // namespace internal | |
| 90 } // namespace mojo | |
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