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// Copyright 2019 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.
#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