rfc8878v3.txt		rfc8878.txt
	Internet Engineering Task Force (IETF) Y. Collet		Internet Engineering Task Force (IETF) Y. Collet
	Request for Comments: 8878 M. Kucherawy, Ed.		Request for Comments: 8878 M. Kucherawy, Ed.
	Obsoletes: 8478 Facebook		Obsoletes: 8478 Facebook
	Category: Informational January 2021		Category: Informational February 2021
	ISSN: 2070-1721		ISSN: 2070-1721
	Zstandard Compression and the 'application/zstd' Media Type		Zstandard Compression and the 'application/zstd' Media Type
	Abstract		Abstract
	Zstandard, or "zstd" (pronounced "zee standard"), is a lossless data		Zstandard, or "zstd" (pronounced "zee standard"), is a lossless data
	compression mechanism. This document describes the mechanism and		compression mechanism. This document describes the mechanism and
	registers a media type, content encoding, and a structured syntax		registers a media type, content encoding, and a structured syntax
	suffix to be used when transporting zstd-compressed content via MIME.		suffix to be used when transporting zstd-compressed content via MIME.
	skipping to change at line 2015 ¶		skipping to change at line 2015 ¶
	As discussed in Section 3.1.2, it is possible to store arbitrary user		As discussed in Section 3.1.2, it is possible to store arbitrary user
	metadata in skippable frames. While such frames are ignored during		metadata in skippable frames. While such frames are ignored during
	decompression of the data, they can be used as a watermark to track		decompression of the data, they can be used as a watermark to track
	the path of the compressed payload.		the path of the compressed payload.
	9. References		9. References
	9.1. Normative References		9.1. Normative References
	[ZSTD] "Zstandard", 2017, <http://www.zstd.net>.		[ZSTD] "Zstandard", <http://www.zstd.net>.
	9.2. Informative References		9.2. Informative References
	[ANS] Duda, J., "Asymmetric numeral systems: entropy coding		[ANS] Duda, J., "Asymmetric numeral systems: entropy coding
	combining speed of Huffman coding with compression rate of		combining speed of Huffman coding with compression rate of
	arithmetic coding", January 2014,		arithmetic coding", January 2014,
	<https://arxiv.org/pdf/1311.2540>.		<https://arxiv.org/pdf/1311.2540>.
	[CRIME] "CRIME", June 2018, <https://en.wikipedia.org/w/		[CRIME] "CRIME", June 2018, <https://en.wikipedia.org/w/
	index.php?title=CRIME&oldid=844538656>.		index.php?title=CRIME&oldid=844538656>.
	skipping to change at line 2050 ¶		skipping to change at line 2050 ¶
	<https://github.com/Cyan4973/FiniteStateEntropy/>.		<https://github.com/Cyan4973/FiniteStateEntropy/>.
	[LZ4] "LZ4 Frame Format Description", commit ec735ac, January		[LZ4] "LZ4 Frame Format Description", commit ec735ac, January
	2019, <https://github.com/lz4/lz4/blob/master/doc/		2019, <https://github.com/lz4/lz4/blob/master/doc/
	lz4_Frame_format.md>.		lz4_Frame_format.md>.
	[RFC1952] Deutsch, P., "GZIP file format specification version 4.3",		[RFC1952] Deutsch, P., "GZIP file format specification version 4.3",
	RFC 1952, DOI 10.17487/RFC1952, May 1996,		RFC 1952, DOI 10.17487/RFC1952, May 1996,
	<https://www.rfc-editor.org/info/rfc1952>.		<https://www.rfc-editor.org/info/rfc1952>.
	[XXHASH] "xxHash", 2017, <http://www.xxhash.org>.		[XXHASH] "xxHash", <http://www.xxhash.org>.
	Appendix A. Decoding Tables for Predefined Codes		Appendix A. Decoding Tables for Predefined Codes
	This appendix contains FSE decoding tables for the predefined		This appendix contains FSE decoding tables for the predefined
	literals length, match length, and offset codes. The tables have		literals length, match length, and offset codes. The tables have
	been constructed using the algorithm as given above in Section 4.1.1.		been constructed using the algorithm as given above in Section 4.1.1.
	The tables here can be used as examples to crosscheck that an		The tables here can be used as examples to crosscheck that an
	implementation has built its decoding tables correctly.		implementation has built its decoding tables correctly.
	A.1. Literals Length Code Table		A.1. Literals Length Code Table
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