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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_MAP_DATA_INTERNAL_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_MAP_DATA_INTERNAL_H_
#include "mojo/public/cpp/bindings/lib/array_internal.h"
#include "mojo/public/cpp/bindings/lib/validate_params.h"
#include "mojo/public/cpp/bindings/lib/validation_errors.h"
namespace mojo {
namespace internal {
// Data types for keys.
template <typename MapKey>
struct MapKeyValidateParams {
public:
typedef NoValidateParams ElementValidateParams;
static const uint32_t expected_num_elements = 0;
static const bool element_is_nullable = false;
};
// For non-nullable strings only. (Which is OK; map keys can't be null.)
template <>
struct MapKeyValidateParams<mojo::internal::Array_Data<char>*> {
public:
typedef ArrayValidateParams<0, false, NoValidateParams> ElementValidateParams;
static const uint32_t expected_num_elements = 0;
static const bool element_is_nullable = false;
};
// Map serializes into a struct which has two arrays as struct fields, the keys
// and the values.
template <typename Key, typename Value>
class Map_Data {
public:
static Map_Data* New(Buffer* buf) {
return new (buf->Allocate(sizeof(Map_Data))) Map_Data();
}
template <typename ValueParams>
static bool Validate(const void* data, BoundsChecker* bounds_checker) {
if (!data)
return true;
if (!ValidateStructHeader(data, sizeof(Map_Data), 2, bounds_checker))
return false;
const Map_Data* object = static_cast<const Map_Data*>(data);
if (!ValidateEncodedPointer(&object->keys.offset)) {
ReportValidationError(VALIDATION_ERROR_ILLEGAL_POINTER);
return false;
}
if (!object->keys.offset) {
ReportValidationError(VALIDATION_ERROR_UNEXPECTED_NULL_POINTER,
"null key array in map struct");
return false;
}
if (!Array_Data<Key>::template Validate<MapKeyValidateParams<Key>>(
DecodePointerRaw(&object->keys.offset), bounds_checker)) {
return false;
}
if (!ValidateEncodedPointer(&object->values.offset)) {
ReportValidationError(VALIDATION_ERROR_ILLEGAL_POINTER);
return false;
}
if (!object->values.offset) {
ReportValidationError(VALIDATION_ERROR_UNEXPECTED_NULL_POINTER,
"null value array in map struct");
return false;
}
if (!Array_Data<Value>::template Validate<ValueParams>(
DecodePointerRaw(&object->values.offset), bounds_checker)) {
return false;
}
const ArrayHeader* key_header =
static_cast<const ArrayHeader*>(DecodePointerRaw(&object->keys.offset));
const ArrayHeader* value_header = static_cast<const ArrayHeader*>(
DecodePointerRaw(&object->values.offset));
if (key_header->num_elements != value_header->num_elements) {
ReportValidationError(VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP);
return false;
}
return true;
}
StructHeader header_;
ArrayPointer<Key> keys;
ArrayPointer<Value> values;
void EncodePointersAndHandles(std::vector<mojo::Handle>* handles) {
Encode(&keys, handles);
Encode(&values, handles);
}
void DecodePointersAndHandles(std::vector<mojo::Handle>* handles) {
Decode(&keys, handles);
Decode(&values, handles);
}
private:
Map_Data() {
header_.num_bytes = sizeof(*this);
header_.num_fields = 2;
}
~Map_Data() = delete;
};
static_assert(sizeof(Map_Data<char, char>) == 24, "Bad sizeof(Map_Data)");
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_MAP_DATA_INTERNAL_H_
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