From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/zstd/contrib/pzstd/SkippableFrame.cpp | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 src/zstd/contrib/pzstd/SkippableFrame.cpp (limited to 'src/zstd/contrib/pzstd/SkippableFrame.cpp') diff --git a/src/zstd/contrib/pzstd/SkippableFrame.cpp b/src/zstd/contrib/pzstd/SkippableFrame.cpp new file mode 100644 index 000000000..769866dfc --- /dev/null +++ b/src/zstd/contrib/pzstd/SkippableFrame.cpp @@ -0,0 +1,30 @@ +/* + * 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). + */ +#include "SkippableFrame.h" +#include "mem.h" +#include "utils/Range.h" + +#include + +using namespace pzstd; + +SkippableFrame::SkippableFrame(std::uint32_t size) : frameSize_(size) { + MEM_writeLE32(data_.data(), kSkippableFrameMagicNumber); + MEM_writeLE32(data_.data() + 4, kFrameContentsSize); + MEM_writeLE32(data_.data() + 8, frameSize_); +} + +/* static */ std::size_t SkippableFrame::tryRead(ByteRange bytes) { + if (bytes.size() < SkippableFrame::kSize || + MEM_readLE32(bytes.begin()) != kSkippableFrameMagicNumber || + MEM_readLE32(bytes.begin() + 4) != kFrameContentsSize) { + return 0; + } + return MEM_readLE32(bytes.begin() + 8); +} -- cgit v1.2.3