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// 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() {
for (auto* allocation : mAllocations) {
free(allocation);
}
mAllocations.clear();
// The initial buffer is the inline buffer so that some allocations can be skipped
mCurrentBuffer = mStaticBuffer;
mRemainingSize = sizeof(mStaticBuffer);
}
} // namespace dawn::wire