[pcsx_rearmed.git] / deps / libchdr / deps / zstd-1.5.5 / contrib / pzstd / SkippableFrame.cpp

/*
 * 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);
}
Commit	Line	Data
648db22b	1	/*
	2	* Copyright (c) Meta Platforms, Inc. and affiliates.
	3	* All rights reserved.
	4	*
	5	* This source code is licensed under both the BSD-style license (found in the
	6	* LICENSE file in the root directory of this source tree) and the GPLv2 (found
	7	* in the COPYING file in the root directory of this source tree).
	8	*/
	9	#include "SkippableFrame.h"
	10	#include "mem.h"
	11	#include "utils/Range.h"
	12
	13	#include <cstdio>
	14
	15	using namespace pzstd;
	16
	17	SkippableFrame::SkippableFrame(std::uint32_t size) : frameSize_(size) {
	18	MEM_writeLE32(data_.data(), kSkippableFrameMagicNumber);
	19	MEM_writeLE32(data_.data() + 4, kFrameContentsSize);
	20	MEM_writeLE32(data_.data() + 8, frameSize_);
	21	}
	22
	23	/* static */ std::size_t SkippableFrame::tryRead(ByteRange bytes) {
	24	if (bytes.size() < SkippableFrame::kSize \|\|
	25	MEM_readLE32(bytes.begin()) != kSkippableFrameMagicNumber \|\|
	26	MEM_readLE32(bytes.begin() + 4) != kFrameContentsSize) {
	27	return 0;
	28	}
	29	return MEM_readLE32(bytes.begin() + 8);
	30	}