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/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#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);
}
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