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bd3f58612f
Bug: dawn:680 Change-Id: I6d57280ab11381649deef51ee7babf5ca73f359b Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/42340 Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Stephen White <senorblanco@chromium.org>
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
// Copyright 2021 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef DAWNWIRE_BUFFERCONSUMER_H_
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#define DAWNWIRE_BUFFERCONSUMER_H_
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#include "dawn_wire/WireResult.h"
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#include <cstddef>
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namespace dawn_wire {
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// BufferConsumer is a utility class that allows reading bytes from a buffer
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// while simultaneously decrementing the amount of remaining space by exactly
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// the amount read. It helps prevent bugs where incrementing a pointer and
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// decrementing a size value are not kept in sync.
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// BufferConsumer also contains bounds checks to prevent reading out-of-bounds.
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template <typename BufferT>
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class BufferConsumer {
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static_assert(sizeof(BufferT) == 1,
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"BufferT must be 1-byte, but may have const/volatile qualifiers.");
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public:
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BufferConsumer(BufferT* buffer, size_t size) : mBuffer(buffer), mSize(size) {
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}
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BufferT* Buffer() const {
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return mBuffer;
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}
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size_t AvailableSize() const {
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return mSize;
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}
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protected:
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template <typename T, typename N>
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WireResult NextN(N count, T** data);
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template <typename T>
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WireResult Next(T** data);
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template <typename T>
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WireResult Peek(T** data);
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private:
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BufferT* mBuffer;
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size_t mSize;
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};
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class SerializeBuffer : public BufferConsumer<char> {
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public:
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using BufferConsumer::BufferConsumer;
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using BufferConsumer::Next;
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using BufferConsumer::NextN;
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};
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class DeserializeBuffer : public BufferConsumer<const volatile char> {
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public:
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using BufferConsumer::BufferConsumer;
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using BufferConsumer::Peek;
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template <typename T, typename N>
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WireResult ReadN(N count, const volatile T** data) {
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return NextN(count, data);
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}
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template <typename T>
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WireResult Read(const volatile T** data) {
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return Next(data);
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}
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};
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} // namespace dawn_wire
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#endif // DAWNWIRE_BUFFERCONSUMER_H_
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