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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ | 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ | 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ |
| 7 | 7 |
| 8 #include <stddef.h> | 8 #include <stddef.h> |
| 9 #include <stdint.h> | 9 #include <stdint.h> |
| 10 | 10 |
| 11 #include <queue> | 11 #include <queue> |
| 12 | 12 |
| 13 #include "base/logging.h" | 13 #include "base/logging.h" |
| 14 #include "base/macros.h" | 14 #include "base/macros.h" |
| 15 #include "mojo/public/cpp/bindings/associated_interface_ptr_info.h" | |
| 16 #include "mojo/public/cpp/bindings/interface_ptr.h" | |
| 17 #include "mojo/public/cpp/bindings/lib/bindings_internal.h" | 15 #include "mojo/public/cpp/bindings/lib/bindings_internal.h" |
| 18 #include "mojo/public/cpp/bindings/lib/serialization_context.h" | 16 #include "mojo/public/cpp/bindings/lib/serialization_context.h" |
| 19 #include "mojo/public/cpp/system/handle.h" | |
| 20 | 17 |
| 21 namespace mojo { | 18 namespace mojo { |
| 22 | |
| 23 class AssociatedGroupController; | |
| 24 | |
| 25 namespace internal { | 19 namespace internal { |
| 26 | 20 |
| 27 size_t Align(size_t size); | |
| 28 char* AlignPointer(char* ptr); | |
| 29 | |
| 30 bool IsAligned(const void* ptr); | |
| 31 | |
| 32 // Pointers are encoded as relative offsets. The offsets are relative to the | |
| 33 // address of where the offset value is stored, such that the pointer may be | |
| 34 // recovered with the expression: | |
| 35 // | |
| 36 // ptr = reinterpret_cast<char*>(offset) + *offset | |
| 37 // | |
| 38 // A null pointer is encoded as an offset value of 0. | |
| 39 // | |
| 40 void EncodePointer(const void* ptr, uint64_t* offset); | |
| 41 // Note: This function doesn't validate the encoded pointer value. | |
| 42 const void* DecodePointerRaw(const uint64_t* offset); | |
| 43 | |
| 44 // Note: This function doesn't validate the encoded pointer value. | |
| 45 template <typename T> | |
| 46 inline void DecodePointer(const uint64_t* offset, T** ptr) { | |
| 47 *ptr = reinterpret_cast<T*>(const_cast<void*>(DecodePointerRaw(offset))); | |
| 48 } | |
| 49 | |
| 50 // The following 2 functions are used to encode/decode all objects (structs and | |
| 51 // arrays) in a consistent manner. | |
| 52 | |
| 53 template <typename T> | |
| 54 inline void Encode(T* obj) { | |
| 55 if (obj->ptr) | |
| 56 obj->ptr->EncodePointers(); | |
| 57 EncodePointer(obj->ptr, &obj->offset); | |
| 58 } | |
| 59 | |
| 60 // Note: This function doesn't validate the encoded pointer and handle values. | |
| 61 template <typename T> | |
| 62 inline void Decode(T* obj) { | |
| 63 DecodePointer(&obj->offset, &obj->ptr); | |
| 64 if (obj->ptr) | |
| 65 obj->ptr->DecodePointers(); | |
| 66 } | |
| 67 | |
| 68 template <typename T> | |
| 69 inline void AssociatedInterfacePtrInfoToData( | |
| 70 AssociatedInterfacePtrInfo<T> input, | |
| 71 AssociatedInterface_Data* output) { | |
| 72 output->version = input.version(); | |
| 73 output->interface_id = input.PassHandle().release(); | |
| 74 } | |
| 75 | |
| 76 template <typename T> | |
| 77 inline void AssociatedInterfaceDataToPtrInfo( | |
| 78 AssociatedInterface_Data* input, | |
| 79 AssociatedInterfacePtrInfo<T>* output, | |
| 80 AssociatedGroupController* group_controller) { | |
| 81 output->set_handle(group_controller->CreateLocalEndpointHandle( | |
| 82 FetchAndReset(&input->interface_id))); | |
| 83 output->set_version(input->version); | |
| 84 } | |
| 85 | |
| 86 template <typename T> | |
| 87 inline void InterfacePointerToData(InterfacePtr<T> input, | |
| 88 Interface_Data* output, | |
| 89 SerializationContext* context) { | |
| 90 InterfacePtrInfo<T> info = input.PassInterface(); | |
| 91 output->handle = context->handles.AddHandle(info.PassHandle().release()); | |
| 92 output->version = info.version(); | |
| 93 } | |
| 94 | |
| 95 template <typename T> | |
| 96 inline void InterfaceDataToPointer(Interface_Data* input, | |
| 97 InterfacePtr<T>* output, | |
| 98 SerializationContext* context) { | |
| 99 output->Bind(InterfacePtrInfo<T>( | |
| 100 context->handles.TakeHandleAs<mojo::MessagePipeHandle>(input->handle), | |
| 101 input->version)); | |
| 102 } | |
| 103 | |
| 104 template <typename T> | 21 template <typename T> |
| 105 struct HasIsNullMethod { | 22 struct HasIsNullMethod { |
| 106 template <typename U> | 23 template <typename U> |
| 107 static char Test(decltype(U::IsNull)*); | 24 static char Test(decltype(U::IsNull)*); |
| 108 template <typename U> | 25 template <typename U> |
| 109 static int Test(...); | 26 static int Test(...); |
| 110 static const bool value = sizeof(Test<T>(0)) == sizeof(char); | 27 static const bool value = sizeof(Test<T>(0)) == sizeof(char); |
| 111 | 28 |
| 112 private: | 29 private: |
| 113 EnsureTypeIsComplete<T> check_t_; | 30 EnsureTypeIsComplete<T> check_t_; |
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| 287 typename std::enable_if< | 204 typename std::enable_if< |
| 288 !HasGetDataMethod<Traits, MaybeConstUserType>::value>::type* = nullptr> | 205 !HasGetDataMethod<Traits, MaybeConstUserType>::value>::type* = nullptr> |
| 289 void* CallGetDataIfExists(MaybeConstUserType& input) { | 206 void* CallGetDataIfExists(MaybeConstUserType& input) { |
| 290 return nullptr; | 207 return nullptr; |
| 291 } | 208 } |
| 292 | 209 |
| 293 } // namespace internal | 210 } // namespace internal |
| 294 } // namespace mojo | 211 } // namespace mojo |
| 295 | 212 |
| 296 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ | 213 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_UTIL_H_ |
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