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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package IO::Uncompress::Adapter::Identity;
use warnings;
use strict;
use bytes;
use IO::Compress::Base::Common 2.081 qw(:Status);
use IO::Compress::Zip::Constants ;
our ($VERSION);
$VERSION = '2.081';
use Compress::Raw::Zlib 2.081 ();
sub mkUncompObject
{
my $streaming = shift;
my $zip64 = shift;
my $crc32 = 1; #shift ;
my $adler32 = shift;
bless { 'CompSize' => new U64 , # 0,
'UnCompSize' => 0,
'wantCRC32' => $crc32,
'CRC32' => Compress::Raw::Zlib::crc32(''),
'wantADLER32'=> $adler32,
'ADLER32' => Compress::Raw::Zlib::adler32(''),
'ConsumesInput' => 1,
'Streaming' => $streaming,
'Zip64' => $zip64,
'DataHdrSize' => $zip64 ? 24 : 16,
'Pending' => '',
} ;
}
sub uncompr
{
my $self = shift;
my $in = $_[0];
my $eof = $_[2];
my $len = length $$in;
my $remainder = '';
if (defined $$in && $len) {
if ($self->{Streaming}) {
if (length $self->{Pending}) {
$$in = $self->{Pending} . $$in ;
$len = length $$in;
$self->{Pending} = '';
}
my $ind = index($$in, "\x50\x4b\x07\x08");
if ($ind < 0) {
$len = length $$in;
if ($len >= 3 && substr($$in, -3) eq "\x50\x4b\x07") {
$ind = $len - 3 ;
}
elsif ($len >= 2 && substr($$in, -2) eq "\x50\x4b") {
$ind = $len - 2 ;
}
elsif ($len >= 1 && substr($$in, -1) eq "\x50") {
$ind = $len - 1 ;
}
}
if ($ind >= 0) {
$remainder = substr($$in, $ind) ;
substr($$in, $ind) = '' ;
}
}
if (length $remainder && length $remainder < $self->{DataHdrSize}) {
$self->{Pending} = $remainder ;
$remainder = '';
}
elsif (length $remainder >= $self->{DataHdrSize}) {
my $crc = unpack "V", substr($remainder, 4);
if ($crc == Compress::Raw::Zlib::crc32($$in, $self->{CRC32})) {
my ($l1, $l2) ;
if ($self->{Zip64}) {
$l1 = U64::newUnpack_V64(substr($remainder, 8));
$l2 = U64::newUnpack_V64(substr($remainder, 16));
}
else {
$l1 = U64::newUnpack_V32(substr($remainder, 8));
$l2 = U64::newUnpack_V32(substr($remainder, 12));
}
my $newLen = $self->{CompSize}->clone();
$newLen->add(length $$in);
if ($l1->equal($l2) && $l1->equal($newLen) ) {
$eof = 1;
}
else {
$$in .= substr($remainder, 0, 4) ;
$remainder = substr($remainder, 4);
#$self->{Pending} = substr($remainder, 4);
#$remainder = '';
$eof = 0;
}
}
else {
$$in .= substr($remainder, 0, 4) ;
$remainder = substr($remainder, 4);
#$self->{Pending} = substr($remainder, 4);
#$remainder = '';
$eof = 0;
}
}
if (length $$in) {
$self->{CompSize}->add(length $$in) ;
$self->{CRC32} = Compress::Raw::Zlib::crc32($$in, $self->{CRC32})
if $self->{wantCRC32};
$self->{ADLER32} = Compress::Zlib::adler32($$in, $self->{ADLER32})
if $self->{wantADLER32};
}
${ $_[1] } .= $$in;
$$in = $remainder;
}
return STATUS_ENDSTREAM if $eof;
return STATUS_OK ;
}
sub reset
{
my $self = shift;
$self->{CompSize} = 0;
$self->{UnCompSize} = 0;
$self->{CRC32} = Compress::Raw::Zlib::crc32('');
$self->{ADLER32} = Compress::Raw::Zlib::adler32('');
return STATUS_OK ;
}
#sub count
#{
# my $self = shift ;
# return $self->{UnCompSize} ;
#}
sub compressedBytes
{
my $self = shift ;
return $self->{CompSize} ;
}
sub uncompressedBytes
{
my $self = shift ;
return $self->{CompSize} ;
}
sub sync
{
return STATUS_OK ;
}
sub crc32
{
my $self = shift ;
return $self->{CRC32};
}
sub adler32
{
my $self = shift ;
return $self->{ADLER32};
}
1;
__END__