diff options
author | 2023-12-11 10:48:02 +1100 | |
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committer | 2023-12-11 10:48:02 +1100 | |
commit | 05e69b43e9770e16c4bf1c6ca3e585e64c3f6ff9 (patch) | |
tree | 00ff2118ddc01455ee55785283a2fcfb9bfaf77e /3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp | |
parent | 1a4287925e3982e2f782dee6f62b198984b839de (diff) |
Added Zstandard support for zip archives and CHDs. (#11827)
* 3rdparty/zstd: Added Zstandard compression library version 1.5.5.
* util/unzip.cpp: Added support for Zstandard compression (method 93).
* util/chdcodec.cpp: Added support for Zstandard compression.
* 3rdparty/flac: Always define NDEBUG to avoid log spam.
Diffstat (limited to '3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp')
-rw-r--r-- | 3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp b/3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp new file mode 100644 index 00000000000..3bea4eb65bf --- /dev/null +++ b/3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp @@ -0,0 +1,30 @@ +/* + * Copyright (c) Meta Platforms, Inc. and affiliates. + * 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 <cstdio> + +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); +} |