1 // Copyright 2014 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.
5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
8 #include <string.h> // For |memcpy()|.
12 #include "mojo/public/c/system/macros.h"
13 #include "mojo/public/cpp/bindings/lib/array_internal.h"
14 #include "mojo/public/cpp/bindings/lib/map_serialization.h"
15 #include "mojo/public/cpp/bindings/lib/string_serialization.h"
16 #include "mojo/public/cpp/bindings/lib/template_util.h"
17 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
22 inline size_t GetSerializedSize_(const Array<E>& input);
24 // Because ValidateParams requires explicit argument specification, the
25 // argument-dependent loopup technique used to omit namespace when calling
26 // Serialize_() doesn't seem to work. Therefore, this function is named
27 // differently from those Serialize_() overloads.
28 template <typename ValidateParams, typename E, typename F>
29 inline void SerializeArray_(Array<E> input,
30 internal::Buffer* buf,
31 internal::Array_Data<F>** output);
33 template <typename ValueValidateParams,
34 typename KeyWrapperType,
35 typename ValueWrapperType,
36 typename KeySerializationType,
37 typename ValueSerializationType>
38 inline void SerializeMap_(
39 Map<KeyWrapperType, ValueWrapperType> input,
40 internal::Buffer* buf,
41 internal::Map_Data<KeySerializationType, ValueSerializationType>** output);
43 template <typename E, typename F>
44 inline void Deserialize_(internal::Array_Data<F>* data, Array<E>* output);
48 template <typename E, typename F, bool move_only = IsMoveOnlyType<E>::value>
49 struct ArraySerializer;
51 template <typename E, typename F>
52 struct ArraySerializer<E, F, false> {
53 static_assert(sizeof(E) == sizeof(F), "Incorrect array serializer");
54 static size_t GetSerializedSize(const Array<E>& input) {
55 return sizeof(Array_Data<F>) + Align(input.size() * sizeof(E));
57 template <bool element_is_nullable, typename ElementValidateParams>
58 static void SerializeElements(Array<E> input,
60 Array_Data<F>* output) {
61 static_assert(!element_is_nullable,
62 "Primitive type should be non-nullable");
63 static_assert((IsSame<ElementValidateParams, NoValidateParams>::value),
64 "Primitive type should not have array validate params");
67 memcpy(output->storage(), &input.storage()[0], input.size() * sizeof(E));
69 static void DeserializeElements(Array_Data<F>* input, Array<E>* output) {
70 std::vector<E> result(input->size());
72 memcpy(&result[0], input->storage(), input->size() * sizeof(E));
73 output->Swap(&result);
78 struct ArraySerializer<bool, bool, false> {
79 static size_t GetSerializedSize(const Array<bool>& input) {
80 return sizeof(Array_Data<bool>) + Align((input.size() + 7) / 8);
82 template <bool element_is_nullable, typename ElementValidateParams>
83 static void SerializeElements(Array<bool> input,
85 Array_Data<bool>* output) {
86 static_assert(!element_is_nullable,
87 "Primitive type should be non-nullable");
88 static_assert((IsSame<ElementValidateParams, NoValidateParams>::value),
89 "Primitive type should not have array validate params");
91 // TODO(darin): Can this be a memcpy somehow instead of a bit-by-bit copy?
92 for (size_t i = 0; i < input.size(); ++i)
93 output->at(i) = input[i];
95 static void DeserializeElements(Array_Data<bool>* input,
96 Array<bool>* output) {
97 Array<bool> result(input->size());
98 // TODO(darin): Can this be a memcpy somehow instead of a bit-by-bit copy?
99 for (size_t i = 0; i < input->size(); ++i)
100 result.at(i) = input->at(i);
101 output->Swap(&result);
105 template <typename H>
106 struct ArraySerializer<ScopedHandleBase<H>, H, true> {
107 static size_t GetSerializedSize(const Array<ScopedHandleBase<H>>& input) {
108 return sizeof(Array_Data<H>) + Align(input.size() * sizeof(H));
110 template <bool element_is_nullable, typename ElementValidateParams>
111 static void SerializeElements(Array<ScopedHandleBase<H>> input,
113 Array_Data<H>* output) {
114 static_assert((IsSame<ElementValidateParams, NoValidateParams>::value),
115 "Handle type should not have array validate params");
117 for (size_t i = 0; i < input.size(); ++i) {
118 output->at(i) = input[i].release(); // Transfer ownership of the handle.
119 MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
120 !element_is_nullable && !output->at(i).is_valid(),
121 VALIDATION_ERROR_UNEXPECTED_INVALID_HANDLE,
122 MakeMessageWithArrayIndex(
123 "invalid handle in array expecting valid handles",
128 static void DeserializeElements(Array_Data<H>* input,
129 Array<ScopedHandleBase<H>>* output) {
130 Array<ScopedHandleBase<H>> result(input->size());
131 for (size_t i = 0; i < input->size(); ++i)
132 result.at(i) = MakeScopedHandle(FetchAndReset(&input->at(i)));
133 output->Swap(&result);
137 // This template must only apply to pointer mojo entity (structs and arrays).
138 // This is done by ensuring that WrapperTraits<S>::DataType is a pointer.
139 template <typename S>
140 struct ArraySerializer<S,
141 typename internal::EnableIf<
142 internal::IsPointer<typename internal::WrapperTraits<
143 S>::DataType>::value,
144 typename internal::WrapperTraits<S>::DataType>::type,
146 typedef typename internal::RemovePointer<
147 typename internal::WrapperTraits<S>::DataType>::type S_Data;
148 static size_t GetSerializedSize(const Array<S>& input) {
149 size_t size = sizeof(Array_Data<S_Data*>) +
150 input.size() * sizeof(internal::StructPointer<S_Data>);
151 for (size_t i = 0; i < input.size(); ++i)
152 size += GetSerializedSize_(input[i]);
155 template <bool element_is_nullable, typename ElementValidateParams>
156 static void SerializeElements(Array<S> input,
158 Array_Data<S_Data*>* output) {
159 for (size_t i = 0; i < input.size(); ++i) {
161 SerializeCaller<S, ElementValidateParams>::Run(
162 input[i].Pass(), buf, &element);
163 output->at(i) = element;
164 MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
165 !element_is_nullable && !element,
166 VALIDATION_ERROR_UNEXPECTED_NULL_POINTER,
167 MakeMessageWithArrayIndex(
168 "null in array expecting valid pointers", input.size(), i));
171 static void DeserializeElements(Array_Data<S_Data*>* input,
173 Array<S> result(input->size());
174 for (size_t i = 0; i < input->size(); ++i) {
176 Deserialize_(input->at(i), &element);
177 result[i] = element.Pass();
179 output->Swap(&result);
183 template <typename T, typename Params>
184 struct SerializeCaller {
185 static void Run(T input,
187 typename internal::WrapperTraits<T>::DataType* output) {
188 static_assert((IsSame<Params, NoValidateParams>::value),
189 "Struct type should not have array validate params");
191 Serialize_(input.Pass(), buf, output);
195 template <typename T, typename Params>
196 struct SerializeCaller<Array<T>, Params> {
197 static void Run(Array<T> input,
199 typename Array<T>::Data_** output) {
200 SerializeArray_<Params>(input.Pass(), buf, output);
204 template <typename T, typename U, typename Params>
205 struct SerializeCaller<Map<T, U>, Params> {
206 static void Run(Map<T, U> input,
208 typename Map<T, U>::Data_** output) {
209 SerializeMap_<Params>(input.Pass(), buf, output);
215 struct ArraySerializer<String, String_Data*, false> {
216 static size_t GetSerializedSize(const Array<String>& input) {
217 size_t size = sizeof(Array_Data<String_Data*>) +
218 input.size() * sizeof(internal::StringPointer);
219 for (size_t i = 0; i < input.size(); ++i)
220 size += GetSerializedSize_(input[i]);
223 template <bool element_is_nullable, typename ElementValidateParams>
224 static void SerializeElements(Array<String> input,
226 Array_Data<String_Data*>* output) {
228 (IsSame<ElementValidateParams,
229 ArrayValidateParams<0, false, NoValidateParams>>::value),
230 "String type has unexpected array validate params");
232 for (size_t i = 0; i < input.size(); ++i) {
233 String_Data* element;
234 Serialize_(input[i], buf, &element);
235 output->at(i) = element;
236 MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
237 !element_is_nullable && !element,
238 VALIDATION_ERROR_UNEXPECTED_NULL_POINTER,
239 MakeMessageWithArrayIndex(
240 "null in array expecting valid strings", input.size(), i));
243 static void DeserializeElements(Array_Data<String_Data*>* input,
244 Array<String>* output) {
245 Array<String> result(input->size());
246 for (size_t i = 0; i < input->size(); ++i)
247 Deserialize_(input->at(i), &result[i]);
248 output->Swap(&result);
252 } // namespace internal
254 template <typename E>
255 inline size_t GetSerializedSize_(const Array<E>& input) {
258 typedef typename internal::WrapperTraits<E>::DataType F;
259 return internal::ArraySerializer<E, F>::GetSerializedSize(input);
262 template <typename ValidateParams, typename E, typename F>
263 inline void SerializeArray_(Array<E> input,
264 internal::Buffer* buf,
265 internal::Array_Data<F>** output) {
267 MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
268 ValidateParams::expected_num_elements != 0 &&
269 input.size() != ValidateParams::expected_num_elements,
270 internal::VALIDATION_ERROR_UNEXPECTED_ARRAY_HEADER,
271 internal::MakeMessageWithExpectedArraySize(
272 "fixed-size array has wrong number of elements",
274 ValidateParams::expected_num_elements));
276 internal::Array_Data<F>* result =
277 internal::Array_Data<F>::New(input.size(), buf);
279 internal::ArraySerializer<E, F>::template SerializeElements<
280 ValidateParams::element_is_nullable,
281 typename ValidateParams::ElementValidateParams>(
282 internal::Forward(input), buf, result);
290 template <typename E, typename F>
291 inline void Deserialize_(internal::Array_Data<F>* input, Array<E>* output) {
293 internal::ArraySerializer<E, F>::DeserializeElements(input, output);
301 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_