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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Directory :  /usr/share/perl5/IO/Compress/Zlib/

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Current File : //usr/share/perl5/IO/Compress/Zlib/Constants.pm
package IO::Compress::Zlib::Constants ;

use strict ;
use warnings;
use bytes;

require Exporter;

our ($VERSION, @ISA, @EXPORT);

$VERSION = '2.081';

@ISA = qw(Exporter);

@EXPORT= qw(

        ZLIB_HEADER_SIZE
        ZLIB_TRAILER_SIZE

        ZLIB_CMF_CM_OFFSET
        ZLIB_CMF_CM_BITS
        ZLIB_CMF_CM_DEFLATED

        ZLIB_CMF_CINFO_OFFSET
        ZLIB_CMF_CINFO_BITS 
        ZLIB_CMF_CINFO_MAX

        ZLIB_FLG_FCHECK_OFFSET
        ZLIB_FLG_FCHECK_BITS

        ZLIB_FLG_FDICT_OFFSET
        ZLIB_FLG_FDICT_BITS

        ZLIB_FLG_LEVEL_OFFSET
        ZLIB_FLG_LEVEL_BITS

        ZLIB_FLG_LEVEL_FASTEST
        ZLIB_FLG_LEVEL_FAST
        ZLIB_FLG_LEVEL_DEFAULT
        ZLIB_FLG_LEVEL_SLOWEST

        ZLIB_FDICT_SIZE

        );

# Constant names derived from RFC1950

use constant ZLIB_HEADER_SIZE       => 2;
use constant ZLIB_TRAILER_SIZE      => 4;

use constant ZLIB_CMF_CM_OFFSET     => 0;
use constant ZLIB_CMF_CM_BITS       => 0xF ; # 0b1111
use constant ZLIB_CMF_CM_DEFLATED   => 8;

use constant ZLIB_CMF_CINFO_OFFSET  => 4;
use constant ZLIB_CMF_CINFO_BITS    => 0xF ; # 0b1111;
use constant ZLIB_CMF_CINFO_MAX     => 7;

use constant ZLIB_FLG_FCHECK_OFFSET => 0;
use constant ZLIB_FLG_FCHECK_BITS   => 0x1F ; # 0b11111;

use constant ZLIB_FLG_FDICT_OFFSET  => 5;
use constant ZLIB_FLG_FDICT_BITS    => 0x1 ; # 0b1;

use constant ZLIB_FLG_LEVEL_OFFSET  => 6;
use constant ZLIB_FLG_LEVEL_BITS    => 0x3 ; # 0b11;

use constant ZLIB_FLG_LEVEL_FASTEST => 0;
use constant ZLIB_FLG_LEVEL_FAST    => 1;
use constant ZLIB_FLG_LEVEL_DEFAULT => 2;
use constant ZLIB_FLG_LEVEL_SLOWEST => 3;

use constant ZLIB_FDICT_SIZE        => 4;


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