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Diffstat (limited to '3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp')
-rw-r--r--3rdparty/zstd/contrib/pzstd/SkippableFrame.cpp30
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);
+}