/ 
Archive-Libarchive-0.09
River stage two • 6 direct dependents • 14 total dependents
/ Archive::Libarchive::ArchiveWrite

NAME

Archive::Libarchive::ArchiveWrite - Libarchive write archive class

VERSION

version 0.09

SYNOPSIS

use 5.020;
use Archive::Libarchive;
use Path::Tiny qw( path );

my $w = Archive::Libarchive::ArchiveWrite->new;
$w->set_format_pax_restricted;
$w->open_filename("outarchive.tar");

path('.')->visit(sub ($path, $) {
  my $path = shift;

  return if $path->is_dir;

  my $e = Archive::Libarchive::Entry->new;
  $e->set_pathname("$path");
  $e->set_size(-s $path);
  $e->set_filetype('reg');
  $e->set_perm( oct('0644') );
  $w->write_header($e);
  $w->write_data(\$path->slurp_raw);

}, { recurse => 1 });

$w->close;

DESCRIPTION

This class represents an archive instance for writing to archives.

CONSTRUCTOR

new

# archive_write_new
my $w = Archive::Libarchive::ArchiveWrite->new;

Create a new archive write object.

METHODS

This is a subset of total list of methods available to all archive classes. For the full list see "Archive::Libarchive::ArchiveWrite" in Archive::Libarchive::API.

open

# archive_write_open
$w->open(%callbacks);

This is a basic open method, which relies on callbacks for its implementation. The only callback that is required is the write callback. The open and close callbacks are made available mostly for the benefit of the caller. All callbacks should return a normal status code, which is ARCHIVE_OK on success.

Unlike the libarchive C-API, this interface doesn't provide a facility for passing in "client" data. In Perl this is implemented using a closure, which should allow you to pass in arbitrary variables via proper scoping.

open
$w->open(open => sub ($w) {
  ...
});

Called immediately when the archive is "opened";

write
$w->open(write => sub ($w, $ref) {
  ... = $$ref;
  return $size;
});

This callback is called when data needs to be written to the archive. It is passed in as a reference to a scalar that contains the raw data. On success you should return the actual size of the data written in bytes, and on failure return a normal status code.

close
$w->open(open => sub ($w) {
  ...
});

This is called when the archive instance is closed.

open_FILE

# archive_write_open_FILE
$w->open_FILE($file_pointer);

This takes either a FFI::C::File, or an opaque pointer to a libc file pointer.

open_memory

# archive_write_open_memory
$w->open_memory(\$buffer);

This takes a reference to scalar and stores the archive in memory there.

open_perlfile

$w->open_perlfile(*FILE);

This takes a perl file handle and stores the archive there.

write_data

# archive_write_data
my $size_or_code = $w->write_data(\$buffer);

Write the entry content data to the archive. This takes a reference to the buffer. Returns the number of bytes written on success, and a normal status code on error.

add_filter

# archive_write_add_filter
my $int = $w->add_filter($code);

Add filter to be applied when writing the archive. This will accept either a string representation of the filter code, or the constant. The constant prefix is ARCHIVE_FILTER_. So for a gzipped file this would be either 'gzip' or ARCHIVE_FILTER_GZIP. For the full list see "CONSTANTS" in Archive::Libarchive::API.

set_format

# archive_write_set_format
my $int = $w->set_format($code);

Set the output format. This will accept either a string representation of the format, or the constant. The constant prefix is ARCHIVE_FORMAT_. So for a tar file this would be either 'tar' or ARCHIVE_FORMAT_TAR.

set_passphrase_callback

# archive_write_set_passphrase_callback
my $int = $w->set_passphrase_callback(sub ($w) {
  ...
  return $passphrase;
});

Set a callback that will be called when a passphrase is required, for example with a .zip file with encrypted entries.

SEE ALSO

Archive::Libarchive::Peek

Provides an interface for listing and retrieving entries from an archive without extracting them to the local filesystem.

Archive::Libarchive::Extract

Provides an interface for extracting arbitrary archives of any format/filter supported by libarchive.

Archive::Libarchive::Unwrap

Decompresses / unwraps files that have been compressed or wrapped in any of the filter formats supported by libarchive

Archive::Libarchive

This is the main top-level module for using libarchive from Perl. It is the best place to start reading the documentation. It pulls in the other classes and libarchive constants so that you only need one use statement to effectively use libarchive.

Archive::Libarchive::API

This contains the full and complete API for all of the Archive::Libarchive classes. Because libarchive has hundreds of methods, the main documentation pages elsewhere only contain enough to be useful, and not to overwhelm.

Archive::Libarchive::Archive

The base class of all archive classes. This includes some common error reporting functionality among other things.

Archive::Libarchive::ArchiveRead

This class is used for reading from archives.

Archive::Libarchive::DiskRead

This class is for reading Archive::Libarchive::Entry objects from disk so that they can be written to Archive::Libarchive::ArchiveWrite objects.

Archive::Libarchive::DiskWrite

This class is for writing Archive::Libarchive::Entry objects to disk that have been written from Archive::Libarchive::ArchiveRead objects.

Archive::Libarchive::Entry

This class represents a file in an archive, or on disk.

Archive::Libarchive::EntryLinkResolver

This class exposes the libarchive link resolver API.

Archive::Libarchive::Match

This class exposes the libarchive match API.

Dist::Zilla::Plugin::Libarchive

Build Dist::Zilla based dist tarballs with libarchive instead of the built in Archive::Tar.

Alien::Libarchive3

If a suitable system libarchive can't be found, then this Alien will be installed to provide it.

libarchive.org

The libarchive project home page.

https://github.com/libarchive/libarchive/wiki

The libarchive project wiki.

https://github.com/libarchive/libarchive/wiki/ManualPages

Some of the libarchive man pages are listed here.

AUTHOR

Graham Ollis <plicease@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2021,2022 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.