ÿØÿà JFIF    ÿÛ „  ( %"1!%)+...383,7(-.+  -+++--++++---+-+-----+---------------+---+-++7-----ÿÀ  ß â" ÿÄ     ÿÄ H    !1AQaq"‘¡2B±ÁÑð#R“Ò Tbr‚²á3csƒ’ÂñDS¢³$CÿÄ   ÿÄ %  !1AQa"23‘ÿÚ   ? ôÿ ¨pŸªáÿ —åYõõ\?àÒü©ŠÄï¨pŸªáÿ —åYõõ\?àÓü©ŠÄá 0Ÿªáÿ Ÿå[úƒ ú®ði~TÁbqÐ8OÕpÿ ƒOò¤Oè`–RÂáœá™êi€ßÉ< FtŸI“öÌ8úDf´°å}“¾œ6  öFá°y¥jñÇh†ˆ¢ã/ÃÐ:ªcÈ "Y¡ðÑl>ÿ ”ÏËte:qž\oäŠe÷󲍷˜HT4&ÿ ÓÐü6ö®¿øþßèô Ÿ•7Ñi’•j|“ñì>b…þS?*Óôÿ ÓÐü*h¥£ír¶ü UãSç‚Ÿ[AÐaè[ûª•õ&õj?†Éö+EzP—WeÒírJFt ‘BŒ†Ï‡%#tE Øz ¥OÛ«!1›üä±Í™%ºÍãö]°î(–:@<‹ŒÊö×òÆt¦ãº+‡¦%ÌÁ²h´OƒJŒtMÜ>ÀÜÊw3Y´•牋4ǍýʏTì>œú=Íwhyë,¾Ôò×õ¿ßÊa»«þˆѪQ|%6ž™A õ%:øj<>É—ÿ Å_ˆCbõ¥š±ý¯Ýƒï…¶|RëócÍf溪“t.СøTÿ *Ä¿-{†çàczůŽ_–^XþŒ±miB[X±d 1,é”zEù»& î9gœf™9Ð'.;—™i}!ôšåîqêÛ٤ёý£½ÆA–àôe"A$˝Úsäÿ ÷Û #°xŸëí(l »ý3—¥5m! rt`†0~'j2(]S¦¦kv,ÚÇ l¦øJA£Šƒ J3E8ÙiŽ:cÉžúeZ°€¯\®kÖ(79«Ž:¯X”¾³Š&¡* ….‰Ž(ÜíŸ2¥ª‡×Hi²TF¤ò[¨íÈRëÉ䢍mgÑ.Ÿ<öäS0í„ǹÁU´f#Vß;Õ–…P@3ío<ä-±»Ž.L|kªÀê›fÂ6@»eu‚|ÓaÞÆŸ…¨ááå>åŠ?cKü6ùTÍÆ”†sĤÚ;H2RÚ†õ\Ö·Ÿn'¾ ñ#ºI¤Å´%çÁ­‚â7›‹qT3Iï¨ÖÚ5I7Ë!ÅOóŸ¶øÝñØôת¦$Tcö‘[«Ö³šÒ';Aþ ¸èíg A2Z"i¸vdÄ÷.iõ®§)¿]¤À†–‡É&ä{V¶iŽ”.Ó×Õÿ û?h¬Mt–íª[ÿ Ñÿ ÌV(í}=ibÔ¡›¥¢±b Lô¥‡piη_Z<‡z§èŒ)iÖwiÇ 2hÙ3·=’d÷8éŽ1¦¸c¤µ€7›7Ø ð\á)} ¹fËí›pAÃL%âc2 í§æQz¿;T8sæ°qø)QFMð‰XŒÂ±N¢aF¨…8¯!U  Z©RÊ ÖPVÄÀÍin™Ì-GˆªÅËŠ›•zË}º±ŽÍFò¹}Uw×#ä5B¤{î}Ð<ÙD é©¤&‡ïDbàÁôMÁ." ¤‡ú*õ'VŽ|¼´Úgllº¼klz[Æüï÷Aób‡Eÿ dÑ»Xx9ÃÜ£ÁT/`¼¸vI±Ýµ·Ë‚“G³þ*Ÿû´r|*}<¨îºœ @¦mÄ’M¹”.œ«Y–|6ÏU¤jç¥ÕÞqO ˜kDÆÁ¨5ÿ š;Њ¦¦€GÙk \ –Þ=â¼=SͧµªS°ÚÍpÜãQűÀõ¬?ÃÁ1Ñ•õZà?hóœ€ L¦l{Y*K˜Ù›zc˜–ˆâ ø+¾ ­-Ök¥%ùEÜA'}ˆ><ÊIè“bpÍ/qÞâvoX€w,\úªò6Z[XdÒæ­@Ö—€$òJí#é>'°Ú ôª˜<)4ryÙ£|óAÅn5žêŸyÒäMÝ2{"}‰–¤l÷ûWX\l¾Á¸góÉOÔ /óñB¤f¸çñ[.P˜ZsÊË*ßT܈§QN¢’¡¨§V¼(Üù*eÕ“”5T¨‹Âê¥FŒã½Dü[8'Ò¥a…Ú¶k7a *•›¼'Ò·\8¨ª\@\õ¢¦íq+DÙrmÎ…_ªæ»ŠÓœ¡¯’Ré9MÅ×D™lælffc+ŒÑ,ý™ÿ ¯þǤ=Å’Á7µ÷ÚÛ/“Ü€ñýã¼àí¾ÕÑ+ƒ,uµMâÀÄbm:ÒÎPæ{˜Gz[ƒ¯«® KHà`ßØŠéí¯P8Aq.C‰ à€kòpj´kN¶qô€…Õ,ÜNŠª-­{Zö’æû44‰sŽè‰îVíRœÕm" 6?³D9¡ÇTíÅꋇ`4«¸ÝÁô ï’ýorqКÇZ«x4Žâéþuïf¹µö[P ,Q£éaX±`PÉÍZ ¸äYúg üAx ’6Lê‚xÝÓ*äQ  Ï’¨hÍ =²,6ï#rÃ<¯–£»ƒ‹,–ê•€ aÛsñ'%Æ"®ÛüìBᝠHÚ3ß°©$“XnœÖ’î2ËTeûìxîß ¦å¿çÉ ðK§þ{‘t‚Ϋ¬jéîZ[ ”š7L¥4VÚCE×]m¤Øy”ä4-dz£œ§¸x.*ãÊÊ b÷•h:©‡¦s`BTÁRû¾g⻩‹jø sF¢àJøFl‘È•Xᓁà~*j¯ +(ÚÕ6-£¯÷GŠØy‚<Ç’.F‹Hœw(+)ÜÜâÈzÄäT§FߘãÏ;DmVœ3Àu@mÚüXÝü•3B¨òÌÁÛ<·ÃÜ z,Ì@õÅ·d2]ü8s÷IôÞ¯^Ç9¢u„~ëAŸï4«M? K]­ÅàPl@s_ p:°¬ZR”´›JC[CS.h‹ƒïËœ«Æ]–÷ó‚wR×k7X‰k›‘´ù¦=¡«‰¨¨Â')—71ó’c‡Ðúµ `é.{§p¹ój\Ž{1h{o±Ý=áUÊïGÖŒõ–-BÄm+AZX¶¡ ïHðæ¥JmÙ;…ä¡Ÿˆ¦ ° äšiÉg«$üMk5¤L“’çÊvïâï ,=f“"íἊ5ô¬x6{ɏžID0e¸vçmi'︧ºð9$ò¹÷*£’9ÿ ²TÔ…×>JV¥}Œ}$p[bÔ®*[jzS*8 ”·T›Í–ñUîƒwo$áè=LT™ç—~ô·¤ÈÚ$榍q‰„+´kFm)ž‹©i–ËqÞŠ‰à¶ü( ‚•§ •°ò·‡#5ª•µÊ﯅¡X¨šÁ*F#TXJÊ ušJVÍ&=iÄs1‚3•'fý§5Ñ<=[íÞ­ PÚ;ѱÌ_~Ä££8rÞ ²w;’hDT°>ÈG¬8Á²ÚzŽ®ò®qZcqJêäÞ-ö[ܘbň±çb“Š¶31²n×iƒðÕ;1¶þÉ ªX‰,ßqÏ$>•î íZ¥Z 1{ç൵+ƒÕµ¥°T$§K]á»Ûï*·¤tMI’ÂZbŽÕiÒ˜}bÓ0£ª5›¨ [5Ž^ÝœWøÂÝh° ¢OWun£¤5 a2Z.G2³YL]jåtì”ä ÁÓ‘%"©<ÔúÊ°sº UZvä‡ÄiÆÒM .÷V·™ø#kèýiíÌ–ª)µT[)BˆõÑ xB¾B€ÖT¨.¥~ð@VĶr#¸ü*åZNDŽH;âi ],©£öØpù(šºãö¼T.uCê•4@ÿ GÕÛ)Cx›®0ø#:ÏðFÒbR\(€€Ä®fã4Þ‰Fä¯HXƒÅ,†öEÑÔÜ]Öv²?tLÃvBY£ú6Êu5ÅAQ³1‘’¬x–HŒÐ‡ ^ ¸KwJôÖŽ5×CÚ¨vÜ«/B0$×k°=ðbÇ(Ï)w±A†Á† 11Í=èQšµ626ŒÜ/`G«µ<}—-Ö7KEHÈÉðóȤmݱû±·ø«Snmá=“ä«šmݱŸ¡¶~ó·“äUóJæúòB|E LêŽy´jDÔ$G¢þÐñ7óR8ýÒ…Ç› WVe#·Ÿ p·Fx~•ݤF÷0Èÿ K¯æS<6’¡WШ; ´ÿ ¥Êø\Òuî†åÝ–VNœkÒ7oòX¨Á­Ø÷FÎÑä±g÷ÿ M~Çî=p,X´ ÝÌÚÅ‹’ÃjÖ.ØöÏñ qïQ¤ÓZE†° =6·]܈ s¸>v•Ž^Ý\wq9r‰Î\¸¡kURÒ$­*‹Nq?Þª*!sŠÆ:TU_u±T+øX¡ ®¹¡,ÄâÃBTsÜ$Ø›4m椴zÜK]’’›Pƒ @€#â˜`é¹=I‡fiV•Ôî“nRm+µFPOhÍ0B£ €+¬5c v•:P'ÒyÎ ‰V~‚Ó†ÖuókDoh$å\*ö%Ю=£«…aȼ½÷Û.-½VŒŠ¼'lyî±1¬3ó#ÞE¿ÔS¤gV£m›=§\û"—WU¤ÚǼÿ ÂnÁGŒÃ ‚õN D³õNÚíŒÕ;HôyÄÈ©P¹Ä{:?R‘Ô¨âF÷ø£bÅó® JS|‚R÷ivýáâ€Æé¡è³´IئÑT!§˜•Øª‚¬â@q€wnïCWÄ@JU€ê¯m6]Ï:£âx'+ÒðXvÓ¦Úm=–´7œ $ì“B£~p%ÕŸUþ« N@¼üï~w˜ñø5®—'Ôe»¤5ã//€ž~‰Tþ›Å7•#¤× Íö pÄ$ùeåì*«ÓŠEØWEÈsßg ¦ûvžSsLpºÊW–âµEWöˬH; ™!CYõZ ÃÄf æ#1W. \uWâ\,\Çf j’<qTbên›Î[vxx£ë 'ö¨1›˜ÀM¼Pÿ H)ƒêêŒA7s,|F“ 꺸k³9Ìö*ç®;Ö!Ö$Eiž•¹ÒÚ†ýóéÝû¾ÕS®ó$’NÝäŸz¤5r¦ãÄÃD÷Üø!°ø‡Ô&@m™Ì^Ãä­d q5Lnÿ N;.6½·N|#ä"1Nƒx“ã<3('&ñßt  ~ªu”1Tb㫨9ê–›–bìd$ߣ=#ÕãÒmU¯eí$EFù5ýYô櫨æ왍Ǘ±ssM]·á¿0ÕåJRÓªîiƒ+O58ÖñªŠÒx" \µâá¨i’¤i —Ö ” M+M¤ë9‚‰A¦°Qõ¾ßøK~¼Ã‘g…Ö´~÷Ï[3GUœÒ½#…kàÔ®Ò”‰³·dWV‰IP‰Ú8u¹”E ÖqLj¾êÕCBš{A^Âß;–¨`¯¬ìö ˼ ×tìø.tƐm*n¨y4o&Àx¥n¦×î‡aupáÛj8¿m›è¶ã!o½;ß0y^ý×^EÑ¿ÒjzŒ­)vÚÑnÄL …^ªô× ‡—‚3k Îý­hï]içå–îÏ*÷ñþ»Ô CÒjøjÍznˆ´ ¹#b'Fô‹ ‰v¥'’à'T´ƒHýÍ%M‰ ƒ&ÆÇŒï1 ‘ –Þ ‰i¬s žR-Ÿ kŠ¬á¬7:þ 0ŒÅÒÕ/aÙ¬ÃÝ#Úøœ ©aiVc‰. ¹¦ãµ” ›Yg¦›ÆÎýº°f³7ƒhá·¸­}&D9¡ÂsÉÙÞèŠõØàC™¨ñbFC|´Ü(ŸƒÚÒ-%»'a Ì¿)ËÇn¿úÿ ÞŽX…4ÊÅH^ôΑí@ù¹Eh¶“L8Çjù ¼ÎåVªóR©Ï5uà V4lZß®=€xÖŸ–ÑÈ ÷”¨°¾__yM1tÉ?uÆþIkÄgæ@þ[¢†°XÃJ£j·:nkÅ¢u ‘}âGzö­/IµèŠ¬¼48q¦F°ŽR¼=ûì{´¯RýicS ÕÛ íNtÍÙï£,w4rêì®»~x(©Uñ§#Ñ&œÕ¤>ÎåÍÓ9’Ö{9eV­[Öjâ²ãu]˜å2›qÑšÕJç0€sÄ|Êëè0튔bÁ>“{×_F`Ø©ºê:µä,v¤ðfc1±"«ÔÍän1#=· Âøv~H½ÐßA¾¿Ü€Óš]Õ; I¾÷ç‚Qi†î¹9ywÔKG˜áñ zQY—§ÃÕZ07§X‚ Áh;ÁM)iÌCH-¯T‘ë|A0{Ò½LÚ–TâÖkÜ’dÀ“rmm»”جPF³ÖcbE§T€ÒxKºû’Ó®7±²(\4ŽÃ¸Uu@j™yĵ;³µ!Á¢b.W¤=mõ´êµK k ¸K^ÜÛ#p*Ü14qkZç5ïë †°5Ï%ÍÛ<Õ¤×Ô¥ê†C Õ´¼ú$ƒÖ“”]Ù¬qÞÚ[4©ý!ûÏ—Áb쳐XµA¬â~`›Çr¸8ìùÝ䫦<>ä÷«?xs´ÇÑ /á;¹øüÊÈÙà{"@Žïzâ¬[âß‚ U_<ÇŸ½4èN˜ú61®qŠu ¦þF£»äJ_ˆÙÎ~ ÞAã–Ý„Ï—rŠD;xTž‘ô`É«…suãO`?³à™ô Lý#Íc5öoæØ‚y´´÷«ZR§<&JÇ+éâô´€i!Àˆ0æAoàðLèÖ-2ŸõW.’t^–(KÁmHµV@xÜÇy®Ñø­â^:Ú3w· 7½¹°ñ¸â¹®:',«Mœ—n­Á+Ãbš LÈ‘ÄnRÓÅœ%¦²‰¨ùQ:¤f‚ "PÕtô¸…cæl…&˜Ú˜Ôkv‹ž+vŠ,=¢v­6—Xy*¥t£«<™:“aîϲ=¦6rO]XI¿Œ÷¤zÚ­›¶ 6÷”w\d ü~v®ˆÌk«^m<ÿ ¢‰Õ\)ùºŽ;… lîÙÅEŠ®cѾ@vnMÏ,¼“ñ•ŽBxðÃzãÇç%3ˆ"}Ù•Åî> BÉú;Ò]V+P˜F_´ßé> Øše|ï‡ÄOmFæÇ ãqÞ$/xÐx­z`ï9"œÜij‚!7.\Td…9M‡•iŽ‹¾‘50ÞŽn¥ß4ÉôO ¹*í^QêËÜÇÌ8=Ž§s‰'ÂëÙ«á%Pú[O †ÅP¯VsŽ°.‰,kc¶ ¬A9n˜XÎ-ÞšN["¹QÕ‰ƒMýÁߺXJæÍaLj¾×Ãmã¾ãÚ uñÒþåQô¦¥ /ÄUx:‚ÍÜ’ Đ©ØÝ3V¨‰ÕnÐ6ó*óúK­«…c ¯U òhsý­jóÔj#,ímŒRµ«lbïUTŒÑ8†Ä0œÏr`ð¡¬É Ї ë"À² ™ 6¥ f¶ ¢ÚoܱԷ-<Àî)†a¶ž'Ú»¨TXqØæ¶÷YÄHy˜9ÈIW­YÀuMFë ºÏ’AqÌ4·/Ú †ô'i$øä­=Ä Ý|öK×40è|È6p‘0§)o¥ctî§H+CA-“ xØ|ÐXŠç l8íºð3Ø:³¤¬KX¯UÿÙ # IO::Zlib.pm # # Copyright (c) 1998-2004 Tom Hughes . # All rights reserved. This program is free software; you can redistribute # it and/or modify it under the same terms as Perl itself. package IO::Zlib; $VERSION = "1.10"; =head1 NAME IO::Zlib - IO:: style interface to L =head1 SYNOPSIS With any version of Perl 5 you can use the basic OO interface: use IO::Zlib; $fh = new IO::Zlib; if ($fh->open("file.gz", "rb")) { print <$fh>; $fh->close; } $fh = IO::Zlib->new("file.gz", "wb9"); if (defined $fh) { print $fh "bar\n"; $fh->close; } $fh = IO::Zlib->new("file.gz", "rb"); if (defined $fh) { print <$fh>; undef $fh; # automatically closes the file } With Perl 5.004 you can also use the TIEHANDLE interface to access compressed files just like ordinary files: use IO::Zlib; tie *FILE, 'IO::Zlib', "file.gz", "wb"; print FILE "line 1\nline2\n"; tie *FILE, 'IO::Zlib', "file.gz", "rb"; while () { print "LINE: ", $_ }; =head1 DESCRIPTION C provides an IO:: style interface to L and hence to gzip/zlib compressed files. It provides many of the same methods as the L interface. Starting from IO::Zlib version 1.02, IO::Zlib can also use an external F command. The default behaviour is to try to use an external F if no C can be loaded, unless explicitly disabled by use IO::Zlib qw(:gzip_external 0); If explicitly enabled by use IO::Zlib qw(:gzip_external 1); then the external F is used B of C. =head1 CONSTRUCTOR =over 4 =item new ( [ARGS] ) Creates an C object. If it receives any parameters, they are passed to the method C; if the open fails, the object is destroyed. Otherwise, it is returned to the caller. =back =head1 OBJECT METHODS =over 4 =item open ( FILENAME, MODE ) C takes two arguments. The first is the name of the file to open and the second is the open mode. The mode can be anything acceptable to L and by extension anything acceptable to I (that basically means POSIX fopen() style mode strings plus an optional number to indicate the compression level). =item opened Returns true if the object currently refers to a opened file. =item close Close the file associated with the object and disassociate the file from the handle. Done automatically on destroy. =item getc Return the next character from the file, or undef if none remain. =item getline Return the next line from the file, or undef on end of string. Can safely be called in an array context. Currently ignores $/ ($INPUT_RECORD_SEPARATOR or $RS when L is in use) and treats lines as delimited by "\n". =item getlines Get all remaining lines from the file. It will croak() if accidentally called in a scalar context. =item print ( ARGS... ) Print ARGS to the file. =item read ( BUF, NBYTES, [OFFSET] ) Read some bytes from the file. Returns the number of bytes actually read, 0 on end-of-file, undef on error. =item eof Returns true if the handle is currently positioned at end of file? =item seek ( OFFSET, WHENCE ) Seek to a given position in the stream. Not yet supported. =item tell Return the current position in the stream, as a numeric offset. Not yet supported. =item setpos ( POS ) Set the current position, using the opaque value returned by C. Not yet supported. =item getpos ( POS ) Return the current position in the string, as an opaque object. Not yet supported. =back =head1 USING THE EXTERNAL GZIP If the external F is used, the following Cs are used: open(FH, "gzip -dc $filename |") # for read opens open(FH, " | gzip > $filename") # for write opens You can modify the 'commands' for example to hardwire an absolute path by e.g. use IO::Zlib ':gzip_read_open' => '/some/where/gunzip -c %s |'; use IO::Zlib ':gzip_write_open' => '| /some/where/gzip.exe > %s'; The C<%s> is expanded to be the filename (C is used, so be careful to escape any other C<%> signs). The 'commands' are checked for sanity - they must contain the C<%s>, and the read open must end with the pipe sign, and the write open must begin with the pipe sign. =head1 CLASS METHODS =over 4 =item has_Compress_Zlib Returns true if C is available. Note that this does not mean that C is being used: see L and L. =item gzip_external Undef if an external F B be used if C is not available (see L), true if an external F is explicitly used, false if an external F must not be used. See L. =item gzip_used True if an external F is being used, false if not. =item gzip_read_open Return the 'command' being used for opening a file for reading using an external F. =item gzip_write_open Return the 'command' being used for opening a file for writing using an external F. =back =head1 DIAGNOSTICS =over 4 =item IO::Zlib::getlines: must be called in list context If you want read lines, you must read in list context. =item IO::Zlib::gzopen_external: mode '...' is illegal Use only modes 'rb' or 'wb' or /wb[1-9]/. =item IO::Zlib::import: '...' is illegal The known import symbols are the C<:gzip_external>, C<:gzip_read_open>, and C<:gzip_write_open>. Anything else is not recognized. =item IO::Zlib::import: ':gzip_external' requires an argument The C<:gzip_external> requires one boolean argument. =item IO::Zlib::import: 'gzip_read_open' requires an argument The C<:gzip_external> requires one string argument. =item IO::Zlib::import: 'gzip_read' '...' is illegal The C<:gzip_read_open> argument must end with the pipe sign (|) and have the C<%s> for the filename. See L. =item IO::Zlib::import: 'gzip_write_open' requires an argument The C<:gzip_external> requires one string argument. =item IO::Zlib::import: 'gzip_write_open' '...' is illegal The C<:gzip_write_open> argument must begin with the pipe sign (|) and have the C<%s> for the filename. An output redirect (>) is also often a good idea, depending on your operating system shell syntax. See L. =item IO::Zlib::import: no Compress::Zlib and no external gzip Given that we failed to load C and that the use of an external F was disabled, IO::Zlib has not much chance of working. =item IO::Zlib::open: needs a filename No filename, no open. =item IO::Zlib::READ: NBYTES must be specified We must know how much to read. =item IO::Zlib::WRITE: too long LENGTH The LENGTH must be less than or equal to the buffer size. =back =head1 SEE ALSO L, L, L, L =head1 HISTORY Created by Tom Hughes EFE. Support for external gzip added by Jarkko Hietaniemi EFE. =head1 COPYRIGHT Copyright (c) 1998-2004 Tom Hughes EFE. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut require 5.006; use strict; use vars qw($VERSION $AUTOLOAD @ISA); use Carp; use Fcntl qw(SEEK_SET); my $has_Compress_Zlib; my $aliased; sub has_Compress_Zlib { $has_Compress_Zlib; } BEGIN { eval { require Compress::Zlib }; $has_Compress_Zlib = $@ || $Compress::Zlib::VERSION < 2.000 ? 0 : 1; } use Symbol; use Tie::Handle; # These might use some $^O logic. my $gzip_read_open = "gzip -dc %s |"; my $gzip_write_open = "| gzip > %s"; my $gzip_external; my $gzip_used; sub gzip_read_open { $gzip_read_open; } sub gzip_write_open { $gzip_write_open; } sub gzip_external { $gzip_external; } sub gzip_used { $gzip_used; } sub can_gunzip { $has_Compress_Zlib || $gzip_external; } sub _import { my $import = shift; while (@_) { if ($_[0] eq ':gzip_external') { shift; if (@_) { $gzip_external = shift; } else { croak "$import: ':gzip_external' requires an argument"; } } elsif ($_[0] eq ':gzip_read_open') { shift; if (@_) { $gzip_read_open = shift; croak "$import: ':gzip_read_open' '$gzip_read_open' is illegal" unless $gzip_read_open =~ /^.+%s.+\|\s*$/; } else { croak "$import: ':gzip_read_open' requires an argument"; } } elsif ($_[0] eq ':gzip_write_open') { shift; if (@_) { $gzip_write_open = shift; croak "$import: ':gzip_write_open' '$gzip_read_open' is illegal" unless $gzip_write_open =~ /^\s*\|.+%s.*$/; } else { croak "$import: ':gzip_write_open' requires an argument"; } } else { last; } } return @_; } sub _alias { my $import = shift; if ((!$has_Compress_Zlib && !defined $gzip_external) || $gzip_external) { # The undef *gzopen is really needed only during # testing where we eval several 'use IO::Zlib's. undef *gzopen; *gzopen = \&gzopen_external; *IO::Handle::gzread = \&gzread_external; *IO::Handle::gzwrite = \&gzwrite_external; *IO::Handle::gzreadline = \&gzreadline_external; *IO::Handle::gzeof = \&gzeof_external; *IO::Handle::gzclose = \&gzclose_external; $gzip_used = 1; } else { croak "$import: no Compress::Zlib and no external gzip" unless $has_Compress_Zlib; *gzopen = \&Compress::Zlib::gzopen; *gzread = \&Compress::Zlib::gzread; *gzwrite = \&Compress::Zlib::gzwrite; *gzreadline = \&Compress::Zlib::gzreadline; *gzeof = \&Compress::Zlib::gzeof; } $aliased = 1; } sub import { shift; my $import = "IO::Zlib::import"; if (@_) { if (_import($import, @_)) { croak "$import: '@_' is illegal"; } } _alias($import); } @ISA = qw(Tie::Handle); sub TIEHANDLE { my $class = shift; my @args = @_; my $self = bless {}, $class; return @args ? $self->OPEN(@args) : $self; } sub DESTROY { } sub OPEN { my $self = shift; my $filename = shift; my $mode = shift; croak "IO::Zlib::open: needs a filename" unless defined($filename); $self->{'file'} = gzopen($filename,$mode); return defined($self->{'file'}) ? $self : undef; } sub CLOSE { my $self = shift; return undef unless defined($self->{'file'}); my $status = $self->{'file'}->gzclose(); delete $self->{'file'}; return ($status == 0) ? 1 : undef; } sub READ { my $self = shift; my $bufref = \$_[0]; my $nbytes = $_[1]; my $offset = $_[2] || 0; croak "IO::Zlib::READ: NBYTES must be specified" unless defined($nbytes); $$bufref = "" unless defined($$bufref); my $bytesread = $self->{'file'}->gzread(substr($$bufref,$offset),$nbytes); return undef if $bytesread < 0; return $bytesread; } sub READLINE { my $self = shift; my $line; return () if $self->{'file'}->gzreadline($line) <= 0; return $line unless wantarray; my @lines = $line; while ($self->{'file'}->gzreadline($line) > 0) { push @lines, $line; } return @lines; } sub WRITE { my $self = shift; my $buf = shift; my $length = shift; my $offset = shift; croak "IO::Zlib::WRITE: too long LENGTH" unless $offset + $length <= length($buf); return $self->{'file'}->gzwrite(substr($buf,$offset,$length)); } sub EOF { my $self = shift; return $self->{'file'}->gzeof(); } sub FILENO { return undef; } sub new { my $class = shift; my @args = @_; _alias("new", @_) unless $aliased; # Some call new IO::Zlib directly... my $self = gensym(); tie *{$self}, $class, @args; return tied(${$self}) ? bless $self, $class : undef; } sub getline { my $self = shift; return scalar tied(*{$self})->READLINE(); } sub getlines { my $self = shift; croak "IO::Zlib::getlines: must be called in list context" unless wantarray; return tied(*{$self})->READLINE(); } sub opened { my $self = shift; return defined tied(*{$self})->{'file'}; } sub AUTOLOAD { my $self = shift; $AUTOLOAD =~ s/.*:://; $AUTOLOAD =~ tr/a-z/A-Z/; return tied(*{$self})->$AUTOLOAD(@_); } sub gzopen_external { my ($filename, $mode) = @_; require IO::Handle; my $fh = IO::Handle->new(); if ($mode =~ /r/) { # Because someone will try to read ungzipped files # with this we peek and verify the signature. Yes, # this means that we open the file twice (if it is # gzipped). # Plenty of race conditions exist in this code, but # the alternative would be to capture the stderr of # gzip and parse it, which would be a portability nightmare. if (-e $filename && open($fh, $filename)) { binmode $fh; my $sig; my $rdb = read($fh, $sig, 2); if ($rdb == 2 && $sig eq "\x1F\x8B") { my $ropen = sprintf $gzip_read_open, $filename; if (open($fh, $ropen)) { binmode $fh; return $fh; } else { return undef; } } seek($fh, 0, SEEK_SET) or die "IO::Zlib: open('$filename', 'r'): seek: $!"; return $fh; } else { return undef; } } elsif ($mode =~ /w/) { my $level = ''; $level = "-$1" if $mode =~ /([1-9])/; # To maximize portability we would need to open # two filehandles here, one for "| gzip $level" # and another for "> $filename", and then when # writing copy bytes from the first to the second. # We are using IO::Handle objects for now, however, # and they can only contain one stream at a time. my $wopen = sprintf $gzip_write_open, $filename; if (open($fh, $wopen)) { $fh->autoflush(1); binmode $fh; return $fh; } else { return undef; } } else { croak "IO::Zlib::gzopen_external: mode '$mode' is illegal"; } return undef; } sub gzread_external { # Use read() instead of syswrite() because people may # mix reads and readlines, and we don't want to mess # the stdio buffering. See also gzreadline_external() # and gzwrite_external(). my $nread = read($_[0], $_[1], @_ == 3 ? $_[2] : 4096); defined $nread ? $nread : -1; } sub gzwrite_external { # Using syswrite() is okay (cf. gzread_external()) # since the bytes leave this process and buffering # is therefore not an issue. my $nwrote = syswrite($_[0], $_[1]); defined $nwrote ? $nwrote : -1; } sub gzreadline_external { # See the comment in gzread_external(). $_[1] = readline($_[0]); return defined $_[1] ? length($_[1]) : -1; } sub gzeof_external { return eof($_[0]); } sub gzclose_external { close($_[0]); # I am not entirely certain why this is needed but it seems # the above close() always fails (as if the stream would have # been already closed - something to do with using external # processes via pipes?) return 0; } 1;