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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"
#include "mojo/public/cpp/bindings/lib/validation_util.h"
namespace mojo {
namespace internal {
inline const ArrayValidateParams* GetMapKeyValidateParamsDefault() {
// The memory allocated here never gets released to not cause an exit time
// destructor.
static const ArrayValidateParams* validate_params =
new ArrayValidateParams(0, false, nullptr);
return validate_params;
}
inline const ArrayValidateParams* GetMapKeyValidateParamsForStrings() {
// The memory allocated here never gets released to not cause an exit time
// destructor.
static const ArrayValidateParams* validate_params = new ArrayValidateParams(
0, false, new ArrayValidateParams(0, false, nullptr));
return validate_params;
}
template <typename MapKey>
struct MapKeyValidateParamsFactory {
static const ArrayValidateParams* Get() {
return GetMapKeyValidateParamsDefault();
}
};
// For non-nullable strings only. (Which is OK; map keys can't be null.)
template <>
struct MapKeyValidateParamsFactory<mojo::internal::Array_Data<char>*> {
static const ArrayValidateParams* Get() {
return GetMapKeyValidateParamsForStrings();
}
};
// 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();
}
static bool Validate(const void* data,
BoundsChecker* bounds_checker,
const ArrayValidateParams* value_validate_params) {
if (!data)
return true;
if (!ValidateStructHeaderAndClaimMemory(data, bounds_checker))
return false;
const Map_Data* object = static_cast<const Map_Data*>(data);
if (object->header_.num_bytes != sizeof(Map_Data) ||
object->header_.version != 0) {
ReportValidationError(VALIDATION_ERROR_UNEXPECTED_STRUCT_HEADER);
return false;
}
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;
}
const ArrayValidateParams* key_validate_params =
MapKeyValidateParamsFactory<Key>::Get();
if (!Array_Data<Key>::Validate(DecodePointerRaw(&object->keys.offset),
bounds_checker, key_validate_params)) {
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>::Validate(DecodePointerRaw(&object->values.offset),
bounds_checker, value_validate_params)) {
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_.version = 0;
}
~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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