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Diffstat (limited to 'contrib/pzstd/SkippableFrame.h')
-rw-r--r-- | contrib/pzstd/SkippableFrame.h | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/contrib/pzstd/SkippableFrame.h b/contrib/pzstd/SkippableFrame.h deleted file mode 100644 index 60deed0405be..000000000000 --- a/contrib/pzstd/SkippableFrame.h +++ /dev/null @@ -1,64 +0,0 @@ -/* - * Copyright (c) 2016-present, Facebook, Inc. - * All rights reserved. - * - * This source code is licensed under both the BSD-style license (found in the - * LICENSE file in the root directory of this source tree) and the GPLv2 (found - * in the COPYING file in the root directory of this source tree). - */ -#pragma once - -#include "utils/Range.h" - -#include <array> -#include <cstddef> -#include <cstdint> -#include <cstdio> - -namespace pzstd { -/** - * We put a skippable frame before each frame. - * It contains a skippable frame magic number, the size of the skippable frame, - * and the size of the next frame. - * Each skippable frame is exactly 12 bytes in little endian format. - * The first 8 bytes are for compatibility with the ZSTD format. - * If we have N threads, the output will look like - * - * [0x184D2A50|4|size1] [frame1 of size size1] - * [0x184D2A50|4|size2] [frame2 of size size2] - * ... - * [0x184D2A50|4|sizeN] [frameN of size sizeN] - * - * Each sizeX is 4 bytes. - * - * These skippable frames should allow us to skip through the compressed file - * and only load at most N pages. - */ -class SkippableFrame { - public: - static constexpr std::size_t kSize = 12; - - private: - std::uint32_t frameSize_; - std::array<std::uint8_t, kSize> data_; - static constexpr std::uint32_t kSkippableFrameMagicNumber = 0x184D2A50; - // Could be improved if the size fits in less bytes - static constexpr std::uint32_t kFrameContentsSize = kSize - 8; - - public: - // Write the skippable frame to data_ in LE format. - explicit SkippableFrame(std::uint32_t size); - - // Read the skippable frame from bytes in LE format. - static std::size_t tryRead(ByteRange bytes); - - ByteRange data() const { - return {data_.data(), data_.size()}; - } - - // Size of the next frame. - std::size_t frameSize() const { - return frameSize_; - } -}; -} |