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// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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.get());
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.get());
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.get());
mBuffer += *size;
mSize -= *size;
return WireResult::Success;
}
} // namespace dawn::wire
#endif // SRC_DAWN_WIRE_BUFFERCONSUMER_IMPL_H_