83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
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/*
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* SPDX-FileCopyrightText: Copyright (c) 2020, 2021, 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-FileCopyrightText: Copyright (c) Microsoft Corporation. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0
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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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*/
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#pragma once
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#include "Utils.h"
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#include "config.h"
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#include <assert.h>
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#include <stdint.h>
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#include <string>
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namespace GDeflate
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{
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#pragma pack(push, 1)
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struct TileStream
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{
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static constexpr uint32_t kMaxTiles = (1 << 16) - 1;
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uint8_t id;
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uint8_t magic;
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uint16_t numTiles;
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uint32_t tileSizeIdx : 2; // this must be set to 1
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uint32_t lastTileSize : 18;
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uint32_t reserved1 : 12;
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TileStream(size_t uncompressedSize)
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{
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memset(this, 0, sizeof(*this));
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tileSizeIdx = 1;
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SetCodecId(kGDeflateId);
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SetUncompressedSize(uncompressedSize);
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}
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bool IsValid() const
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{
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return id == (magic ^ 0xff);
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}
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size_t GetUncompressedSize() const
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{
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return numTiles * kDefaultTileSize - (lastTileSize == 0 ? 0 : kDefaultTileSize - lastTileSize);
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}
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private:
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void SetCodecId(uint8_t inId)
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{
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id = inId;
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magic = inId ^ 0xff;
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}
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void SetUncompressedSize(size_t size)
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{
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numTiles = static_cast<uint16_t>(size / kDefaultTileSize);
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lastTileSize = static_cast<uint32_t>(size - numTiles * kDefaultTileSize);
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numTiles += lastTileSize != 0 ? 1 : 0;
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}
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};
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#pragma pack(pop)
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static_assert(sizeof(TileStream) == 8, "Tile stream header size overrun!");
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} // namespace GDeflate
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