| // 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); |
| 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_ |