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// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_DAWN_WIRE_BUFFERCONSUMER_IMPL_H_
#define SRC_DAWN_WIRE_BUFFERCONSUMER_IMPL_H_
#include <limits>
#include <type_traits>
#include "dawn/wire/BufferConsumer.h"
namespace dawn::wire {
template <typename BufferT>
template <typename T>
WireResult BufferConsumer<BufferT>::Peek(T** data) {
if (sizeof(T) > mSize) {
return WireResult::FatalError;
}
*data = reinterpret_cast<T*>(mBuffer);
return WireResult::Success;
}
template <typename BufferT>
template <typename T>
WireResult BufferConsumer<BufferT>::Next(T** data) {
constexpr size_t kSize = WireAlignSizeof<T>();
if (kSize > mSize) {
return WireResult::FatalError;
}
*data = reinterpret_cast<T*>(mBuffer);
mBuffer += kSize;
mSize -= kSize;
return WireResult::Success;
}
template <typename BufferT>
template <typename T, typename N>
WireResult BufferConsumer<BufferT>::NextN(N count, T** data) {
static_assert(std::is_unsigned<N>::value, "|count| argument of NextN must be unsigned.");
// If size is zero then it indicates an overflow.
auto size = WireAlignSizeofN<T>(count);
if (!size || *size > mSize) {
return WireResult::FatalError;
}
*data = reinterpret_cast<T*>(mBuffer);
mBuffer += *size;
mSize -= *size;
return WireResult::Success;
}
} // namespace dawn::wire
#endif // SRC_DAWN_WIRE_BUFFERCONSUMER_IMPL_H_