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// Copyright 2014 The Chromium 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 MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
#include <string.h> // For |memcpy()|.
#include <vector>
#include "mojo/public/c/system/macros.h"
#include "mojo/public/cpp/bindings/lib/array_internal.h"
#include "mojo/public/cpp/bindings/lib/string_serialization.h"
#include "mojo/public/cpp/bindings/lib/template_util.h"
#include "mojo/public/cpp/bindings/lib/validation_errors.h"
namespace mojo {
template <typename E>
inline size_t GetSerializedSize_(const Array<E>& input);
// Because ValidateParams requires explicit argument specification, the
// argument-dependent loopup technique used to omit namespace when calling
// Serialize_() doesn't seem to work. Therefore, this function is named
// differently from those Serialize_() overloads.
template <typename ValidateParams, typename E, typename F>
inline void SerializeArray_(Array<E> input, internal::Buffer* buf,
internal::Array_Data<F>** output);
template <typename E, typename F>
inline void Deserialize_(internal::Array_Data<F>* data, Array<E>* output);
namespace internal {
template <typename E, typename F, bool move_only = IsMoveOnlyType<E>::value>
struct ArraySerializer;
template <typename E, typename F> struct ArraySerializer<E, F, false> {
MOJO_COMPILE_ASSERT(sizeof(E) == sizeof(F), wrong_array_serializer);
static size_t GetSerializedSize(const Array<E>& input) {
return sizeof(Array_Data<F>) + Align(input.size() * sizeof(E));
}
template <bool element_is_nullable, typename ElementValidateParams>
static void SerializeElements(
Array<E> input, Buffer* buf, Array_Data<F>* output) {
MOJO_COMPILE_ASSERT(!element_is_nullable,
Primitive_type_should_be_non_nullable);
MOJO_COMPILE_ASSERT(
(IsSame<ElementValidateParams, NoValidateParams>::value),
Primitive_type_should_not_have_array_validate_params);
memcpy(output->storage(), &input.storage()[0], input.size() * sizeof(E));
}
static void DeserializeElements(
Array_Data<F>* input, Array<E>* output) {
std::vector<E> result(input->size());
memcpy(&result[0], input->storage(), input->size() * sizeof(E));
output->Swap(&result);
}
};
template <> struct ArraySerializer<bool, bool, false> {
static size_t GetSerializedSize(const Array<bool>& input) {
return sizeof(Array_Data<bool>) + Align((input.size() + 7) / 8);
}
template <bool element_is_nullable, typename ElementValidateParams>
static void SerializeElements(
Array<bool> input, Buffer* buf, Array_Data<bool>* output) {
MOJO_COMPILE_ASSERT(!element_is_nullable,
Primitive_type_should_be_non_nullable);
MOJO_COMPILE_ASSERT(
(IsSame<ElementValidateParams, NoValidateParams>::value),
Primitive_type_should_not_have_array_validate_params);
// TODO(darin): Can this be a memcpy somehow instead of a bit-by-bit copy?
for (size_t i = 0; i < input.size(); ++i)
output->at(i) = input[i];
}
static void DeserializeElements(
Array_Data<bool>* input, Array<bool>* output) {
Array<bool> result(input->size());
// TODO(darin): Can this be a memcpy somehow instead of a bit-by-bit copy?
for (size_t i = 0; i < input->size(); ++i)
result.at(i) = input->at(i);
output->Swap(&result);
}
};
template <typename H> struct ArraySerializer<ScopedHandleBase<H>, H, true> {
static size_t GetSerializedSize(const Array<ScopedHandleBase<H> >& input) {
return sizeof(Array_Data<H>) + Align(input.size() * sizeof(H));
}
template <bool element_is_nullable, typename ElementValidateParams>
static void SerializeElements(Array<ScopedHandleBase<H> > input,
Buffer* buf,
Array_Data<H>* output) {
MOJO_COMPILE_ASSERT(
(IsSame<ElementValidateParams, NoValidateParams>::value),
Handle_type_should_not_have_array_validate_params);
for (size_t i = 0; i < input.size(); ++i) {
output->at(i) = input[i].release(); // Transfer ownership of the handle.
MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
!element_is_nullable && !output->at(i).is_valid(),
VALIDATION_ERROR_UNEXPECTED_INVALID_HANDLE);
}
}
static void DeserializeElements(
Array_Data<H>* input, Array<ScopedHandleBase<H> >* output) {
Array<ScopedHandleBase<H> > result(input->size());
for (size_t i = 0; i < input->size(); ++i)
result.at(i) = MakeScopedHandle(FetchAndReset(&input->at(i)));
output->Swap(&result);
}
};
template <typename S> struct ArraySerializer<S, typename S::Data_*, true> {
static size_t GetSerializedSize(const Array<S>& input) {
size_t size = sizeof(Array_Data<typename S::Data_*>) +
input.size() * sizeof(internal::StructPointer<typename S::Data_>);
for (size_t i = 0; i < input.size(); ++i)
size += GetSerializedSize_(input[i]);
return size;
}
template <bool element_is_nullable, typename ElementValidateParams>
static void SerializeElements(Array<S> input,
Buffer* buf,
Array_Data<typename S::Data_*>* output) {
for (size_t i = 0; i < input.size(); ++i) {
typename S::Data_* element;
SerializeCaller<S, ElementValidateParams>::Run(
input[i].Pass(), buf, &element);
output->at(i) = element;
MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
!element_is_nullable && !element,
VALIDATION_ERROR_UNEXPECTED_NULL_POINTER);
}
}
static void DeserializeElements(
Array_Data<typename S::Data_*>* input, Array<S>* output) {
Array<S> result(input->size());
for (size_t i = 0; i < input->size(); ++i) {
S element;
Deserialize_(input->at(i), &element);
result[i] = element.Pass();
}
output->Swap(&result);
}
private:
template <typename T, typename Params>
struct SerializeCaller {
static void Run(T input, Buffer* buf, typename T::Data_** output) {
MOJO_COMPILE_ASSERT((IsSame<Params, NoValidateParams>::value),
Struct_type_should_not_have_array_validate_params);
Serialize_(input.Pass(), buf, output);
}
};
template <typename T, typename Params>
struct SerializeCaller<Array<T>, Params> {
static void Run(Array<T> input,
Buffer* buf,
typename Array<T>::Data_** output) {
SerializeArray_<Params>(input.Pass(), buf, output);
}
};
};
template <> struct ArraySerializer<String, String_Data*, false> {
static size_t GetSerializedSize(const Array<String>& input) {
size_t size = sizeof(Array_Data<String_Data*>) +
input.size() * sizeof(internal::StringPointer);
for (size_t i = 0; i < input.size(); ++i)
size += GetSerializedSize_(input[i]);
return size;
}
template <bool element_is_nullable, typename ElementValidateParams>
static void SerializeElements(
Array<String> input,
Buffer* buf,
Array_Data<String_Data*>* output) {
MOJO_COMPILE_ASSERT(
(IsSame<ElementValidateParams,
ArrayValidateParams<0, false, NoValidateParams> >::value),
String_type_has_unexpected_array_validate_params);
for (size_t i = 0; i < input.size(); ++i) {
String_Data* element;
Serialize_(input[i], buf, &element);
output->at(i) = element;
MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
!element_is_nullable && !element,
VALIDATION_ERROR_UNEXPECTED_NULL_POINTER);
}
}
static void DeserializeElements(
Array_Data<String_Data*>* input, Array<String>* output) {
Array<String> result(input->size());
for (size_t i = 0; i < input->size(); ++i)
Deserialize_(input->at(i), &result[i]);
output->Swap(&result);
}
};
} // namespace internal
template <typename E>
inline size_t GetSerializedSize_(const Array<E>& input) {
if (!input)
return 0;
typedef typename internal::WrapperTraits<E>::DataType F;
return internal::ArraySerializer<E, F>::GetSerializedSize(input);
}
template <typename ValidateParams, typename E, typename F>
inline void SerializeArray_(Array<E> input, internal::Buffer* buf,
internal::Array_Data<F>** output) {
if (input) {
MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(
ValidateParams::expected_num_elements != 0 &&
input.size() != ValidateParams::expected_num_elements,
internal::VALIDATION_ERROR_UNEXPECTED_ARRAY_HEADER);
internal::Array_Data<F>* result =
internal::Array_Data<F>::New(input.size(), buf);
if (result) {
internal::ArraySerializer<E, F>::template SerializeElements<
ValidateParams::element_is_nullable,
typename ValidateParams::ElementValidateParams>(
internal::Forward(input), buf, result);
}
*output = result;
} else {
*output = NULL;
}
}
template <typename E, typename F>
inline void Deserialize_(internal::Array_Data<F>* input, Array<E>* output) {
if (input) {
internal::ArraySerializer<E, F>::DeserializeElements(input, output);
} else {
output->reset();
}
}
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
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