#Lzip usgae plus#

The :gzip_external requires one string argument. # IO::Zlib::import: 'gzip_write_open' requires an argument The :gzip_read_open argument must end with the pipe sign (|) and have the %s for the filename. # IO::Zlib::import: 'gzip_read' '.' is illegal # IO::Zlib::import: 'gzip_read_open' requires an argument The :gzip_external requires one boolean argument. # IO::Zlib::import: ':gzip_external' requires an argument The known import symbols are the :gzip_external, :gzip_read_open, and :gzip_write_open. # IO::Zlib::gzopen_external: mode '.' is illegal If you want read lines, you must read in list context. #DIAGNOSTICS # IO::Zlib::getlines: must be called in list context Return the 'command' being used for opening a file for writing using an external gzip. Return the 'command' being used for opening a file for reading using an external gzip. True if an external gzip is being used, false if not. Undef if an external gzip can be used if Compress::Zlib is not available (see 'has_Compress_Zlib'), true if an external gzip is explicitly used, false if an external gzip must not be used. Note that this does not mean that Compress::Zlib is being used: see 'gzip_external' and gzip_used. Returns true if Compress::Zlib is available. The 'commands' are checked for sanity - they must contain the %s, and the read open must end with the pipe sign, and the write open must begin with the pipe sign. The %s is expanded to be the filename ( sprintf is used, so be careful to escape any other % signs). Use IO::Zlib ':gzip_write_open' => '| /some/where/gzip.exe > %s' use IO::Zlib ':gzip_read_open' => '/some/where/gunzip -c %s |' You can modify the 'commands' for example to hardwire an absolute path by e.g.

Open(FH, ' | gzip > $filename') # for write opens If the external gzip is used, the following opens are used: open(FH, 'gzip -dc $filename |') # for read opens Return the current position in the string, as an opaque object. Set the current position, using the opaque value returned by getpos(). Return the current position in the stream, as a numeric offset. Returns true if the handle is currently positioned at end of file? # seek ( OFFSET, WHENCE ) Returns the number of bytes actually read, 0 on end-of-file, undef on error. It will croak() if accidentally called in a scalar context.

Currently ignores $/ ($INPUT_RECORD_SEPARATOR or $RS when English is in use) and treats lines as delimited by ' '. Can safely be called in an array context. Return the next line from the file, or undef on end of string. Return the next character from the file, or undef if none remain. #closeĬlose the file associated with the object and disassociate the file from the handle. Returns true if the object currently refers to a opened file.

#Lzip usgae plus#

The mode can be anything acceptable to Compress::Zlib and by extension anything acceptable to zlib (that basically means POSIX fopen() style mode strings plus an optional number to indicate the compression level). The first is the name of the file to open and the second is the open mode. # OBJECT METHODS # open ( FILENAME, MODE ) If it receives any parameters, they are passed to the method open if the open fails, the object is destroyed. #CONSTRUCTOR # new ( )Ĭreates an IO::Zlib object. Then the external gzip is used instead of Compress::Zlib. If explicitly enabled by use IO::Zlib qw(:gzip_external 1) The default behaviour is to try to use an external gzip if no Compress::Zlib can be loaded, unless explicitly disabled by use IO::Zlib qw(:gzip_external 0) Starting from IO::Zlib version 1.02, IO::Zlib can also use an external gzip command. It provides many of the same methods as the IO::Handle interface. IO::Zlib provides an IO:: style interface to Compress::Zlib and hence to gzip/zlib compressed files. With Perl 5.004 you can also use the TIEHANDLE interface to access compressed files just like ordinary files: use IO::Zlib Undef $fh # automatically closes the file With any version of Perl 5 you can use the basic OO interface: use IO::Zlib IO::Zlib - IO:: style interface to Compress::Zlib #SYNOPSIS