| // Copyright 2019 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. |
| |
| #include "dawn/wire/WireDeserializeAllocator.h" |
| |
| #include <algorithm> |
| |
| namespace dawn::wire { |
| WireDeserializeAllocator::WireDeserializeAllocator() { |
| Reset(); |
| } |
| |
| WireDeserializeAllocator::~WireDeserializeAllocator() { |
| Reset(); |
| } |
| |
| void* WireDeserializeAllocator::GetSpace(size_t size) { |
| // Return space in the current buffer if possible first. |
| if (mRemainingSize >= size) { |
| char* buffer = mCurrentBuffer; |
| mCurrentBuffer += size; |
| mRemainingSize -= size; |
| return buffer; |
| } |
| |
| // Otherwise allocate a new buffer and try again. |
| size_t allocationSize = std::max(size, size_t(2048)); |
| char* allocation = static_cast<char*>(malloc(allocationSize)); |
| if (allocation == nullptr) { |
| return nullptr; |
| } |
| |
| mAllocations.push_back(allocation); |
| mCurrentBuffer = allocation; |
| mRemainingSize = allocationSize; |
| return GetSpace(size); |
| } |
| |
| void WireDeserializeAllocator::Reset() { |
| // The initial buffer is the inline buffer so that some allocations can be skipped |
| mCurrentBuffer = mStaticBuffer; |
| mRemainingSize = sizeof(mStaticBuffer); |
| |
| for (auto& allocation : mAllocations) { |
| free(allocation.ExtractAsDangling()); |
| } |
| mAllocations.clear(); |
| } |
| } // namespace dawn::wire |