Dpkg::Checksums man page on ElementaryOS

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Dpkg::Checksums(3)		 libdpkg-perl		    Dpkg::Checksums(3)

       Dpkg::Checksums - generate and manipulate file checksums

       This module provides an object that can generate and manipulate various
       file checksums as well as some methods to query information about
       supported checksums.

       @list = checksums_get_list()
	   Returns the list of supported checksums algorithms.

       $bool = checksums_is_supported($alg)
	   Returns a boolean indicating whether the given checksum algorithm
	   is supported. The checksum algorithm is case-insensitive.

       $value = checksums_get_property($alg, $property)
	   Returns the requested property of the checksum algorithm. Returns
	   undef if either the property or the checksum algorithm doesn't
	   exist. Valid properties currently include "program" (returns an
	   array reference with a program name and parameters required to
	   compute the checksum of the filename given as last parameter) and
	   "regex" for the regular expression describing the common string
	   representation of the checksum (as output by the program that
	   generates it).

       my $ck = Dpkg::Checksums->new()
	   Create a new Dpkg::Checksums object. This object is able to store
	   the checksums of several files to later export them or verify them.

	   Forget about all checksums stored. The object is again in the same
	   state as if it was newly created.

       $ck->add_from_file($filename, %opts)
	   Add checksums information for the file $filename. The file must
	   exists for the call to succeed. If you don't want the given
	   filename to appear when you later export the checksums you might
	   want to set the "key" option with the public name that you want to
	   use. Also if you don't want to generate all the checksums, you can
	   pass an array reference of the wanted checksums in the "checksums"

	   It the object already contains checksums information associated the
	   filename (or key), it will error out if the newly computed
	   information does not match what's stored.

       $ck->add_from_string($alg, $value)
	   Add checksums of type $alg that are stored in the $value variable.
	   $value can be multi-lines, each line should be a space separated
	   list of checksum, file size and filename. Leading or trailing
	   spaces are not allowed.

	   It the object already contains checksums information associated to
	   the filenames, it will error out if the newly read information does
	   not match what's stored.

       $ck->add_from_control($control, %opts)
	   Read checksums from Checksums-* fields stored in the Dpkg::Control
	   object $control. It uses $self->add_from_string() on the field
	   values to do the actual work.

	   If the option "use_files_for_md5" evaluates to true, then the
	   "Files" field is used in place of the "Checksums-Md5" field. By
	   default the option is false.

       @files = $ck->get_files()
	   Return the list of files whose checksums are stored in the object.

       $bool = $ck->has_file($file)
	   Return true if we have checksums for the given file. Returns false

	   Remove all checksums of the given file.

       $checksum = $ck->get_checksum($file, $alg)
	   Return the checksum of type $alg for the requested $file. This will
	   not compute the checksum but only return the checksum stored in the
	   object, if any.

	   If $alg is not defined, it returns a reference to a hash: keys are
	   the checksum algorithms and values are the checksums themselves.
	   The hash returned must not be modified, it's internal to the

       $size = $ck->get_size($file)
	   Return the size of the requested file if it's available in the

       $ck->export_to_string($alg, %opts)
	   Return a multi-line string containing the checksums of type $alg.
	   The string can be stored as-is in a Checksum-* field of a
	   Dpkg::Control object.

       $ck->export_to_control($control, %opts)
	   Export the checksums in the Checksums-* fields of the Dpkg::Control
	   $control object.

       Raphaƫl Hertzog <hertzog@debian.org>.

1.17.5				  2013-12-10		    Dpkg::Checksums(3)

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