晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/mysql/my_compress.h
/* Copyright (c) 2019, 2023, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef MY_COMPRESS_INCLUDED
#define MY_COMPRESS_INCLUDED

/* List of valid values for compression_algorithm */
enum enum_compression_algorithm {
  MYSQL_UNCOMPRESSED = 1,
  MYSQL_ZLIB,
  MYSQL_ZSTD,
  MYSQL_INVALID
};

/**
  Compress context information. relating to zlib compression.
*/

typedef struct mysql_zlib_compress_context {
  /**
    Compression level to use in zlib compression.
  */
  unsigned int compression_level;
} mysql_zlib_compress_context;

typedef struct ZSTD_CCtx_s ZSTD_CCtx;
typedef struct ZSTD_DCtx_s ZSTD_DCtx;

/**
  Compress context information relating to zstd compression.
*/

typedef struct mysql_zstd_compress_context {
  /**
    Pointer to compressor context.
  */
  ZSTD_CCtx *cctx;
  /**
    Pointer to decompressor context.
  */
  ZSTD_DCtx *dctx;
  /**
    Compression level to use in zstd compression.
  */
  unsigned int compression_level;
} mysql_zstd_compress_context;

/**
  Compression context information.
  It encapsulate the context information based on compression method and
  presents a generic struct.
*/

typedef struct mysql_compress_context {
  enum enum_compression_algorithm algorithm;  ///< Compression algorithm name.
  union {
    mysql_zlib_compress_context zlib_ctx;  ///< Context information of zlib.
    mysql_zstd_compress_context zstd_ctx;  ///< Context information of zstd.
  } u;
} mysql_compress_context;

/**
  Get default compression level corresponding to a given compression method.

  @param algorithm Compression Method. Possible values are zlib or zstd.

  @return an unsigned int representing default compression level.
  6 is the default compression level for zlib and 3 is the
  default compression level for zstd.
*/

unsigned int mysql_default_compression_level(
    enum enum_compression_algorithm algorithm);

/**
  Initialize a compress context object to be associated with a NET object.

  @param cmp_ctx Pointer to compression context.
  @param algorithm Compression algorithm.
  @param compression_level Compression level corresponding to the compression
  algorithm.
*/

void mysql_compress_context_init(mysql_compress_context *cmp_ctx,
                                 enum enum_compression_algorithm algorithm,
                                 unsigned int compression_level);
/**
  Deinitialize the compression context allocated.

  @param mysql_compress_ctx Pointer to Compression context.
*/

void mysql_compress_context_deinit(mysql_compress_context *mysql_compress_ctx);

#endif  // MY_COMPRESS_INCLUDED

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