2016-09-01 22:22:19 +00:00
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/**
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#include "SkippableFrame.h"
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2016-09-02 19:23:49 +00:00
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#include "mem.h"
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2016-09-01 22:22:19 +00:00
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#include "utils/Range.h"
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#include <cstdio>
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using namespace pzstd;
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SkippableFrame::SkippableFrame(std::uint32_t size) : frameSize_(size) {
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MEM_writeLE32(data_.data(), kSkippableFrameMagicNumber);
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MEM_writeLE32(data_.data() + 4, kFrameContentsSize);
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MEM_writeLE32(data_.data() + 8, frameSize_);
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}
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/* static */ std::size_t SkippableFrame::tryRead(ByteRange bytes) {
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if (bytes.size() < SkippableFrame::kSize ||
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MEM_readLE32(bytes.begin()) != kSkippableFrameMagicNumber ||
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MEM_readLE32(bytes.begin() + 4) != kFrameContentsSize) {
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return 0;
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}
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return MEM_readLE32(bytes.begin() + 8);
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}
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