1Dpkg::Checksums(3perl) libdpkg-perl Dpkg::Checksums(3perl)
2
6 Dpkg::Checksums - generate and manipulate file checksums
7
9 This module provides a class that can generate and manipulate various
10 file checksums as well as some methods to query information about
11 supported checksums.
12
14 @list = checksums_get_list()
15 Returns the list of supported checksums algorithms.
16 $bool = checksums_is_supported($alg)
18 Returns a boolean indicating whether the given checksum algorithm
19 is supported. The checksum algorithm is case-insensitive.
20 $value = checksums_get_property($alg, $property)
22 Returns the requested property of the checksum algorithm. Returns
23 undef if either the property or the checksum algorithm doesn't
24 exist. Valid properties currently include "name" (returns the name
25 of the digest algorithm), "regex" for the regular expression
26 describing the common string representation of the checksum, and
27 "strong" for a boolean describing whether the checksum algorithm is
28 considered cryptographically strong.
29
31 $ck = Dpkg::Checksums->new()
32 Create a new Dpkg::Checksums object. This object is able to store
33 the checksums of several files to later export them or verify them.
34 $ck->reset()
36 Forget about all checksums stored. The object is again in the same
37 state as if it was newly created.
38 $ck->add_from_file($filename, %opts)
40 Add or verify checksums information for the file $filename. The
41 file must exists for the call to succeed. If you don't want the
42 given filename to appear when you later export the checksums you
43 might want to set the "key" option with the public name that you
44 want to use. Also if you don't want to generate all the checksums,
45 you can pass an array reference of the wanted checksums in the
46 "checksums" option.
47 It the object already contains checksums information associated the
49 filename (or key), it will error out if the newly computed
50 information does not match what's stored, and the caller did not
51 request that it be updated with the boolean "update" option.
52 $ck->add_from_string($alg, $value, %opts)
54 Add checksums of type $alg that are stored in the $value variable.
55 $value can be multi-lines, each line should be a space separated
56 list of checksum, file size and filename. Leading or trailing
57 spaces are not allowed.
58 It the object already contains checksums information associated to
60 the filenames, it will error out if the newly read information does
61 not match what's stored, and the caller did not request that it be
62 updated with the boolean "update" option.
63 $ck->add_from_control($control, %opts)
65 Read checksums from Checksums-* fields stored in the Dpkg::Control
66 object $control. It uses $self->add_from_string() on the field
67 values to do the actual work.
68 If the option "use_files_for_md5" evaluates to true, then the
70 "Files" field is used in place of the "Checksums-Md5" field. By
71 default the option is false.
72 @files = $ck->get_files()
74 Return the list of files whose checksums are stored in the object.
75 $bool = $ck->has_file($file)
77 Return true if we have checksums for the given file. Returns false
78 otherwise.
79 $ck->remove_file($file)
81 Remove all checksums of the given file.
82 $checksum = $ck->get_checksum($file, $alg)
84 Return the checksum of type $alg for the requested $file. This will
85 not compute the checksum but only return the checksum stored in the
86 object, if any.
87 If $alg is not defined, it returns a reference to a hash: keys are
89 the checksum algorithms and values are the checksums themselves.
90 The hash returned must not be modified, it's internal to the
91 object.
92 $size = $ck->get_size($file)
94 Return the size of the requested file if it's available in the
95 object.
96 $bool = $ck->has_strong_checksums($file)
98 Return a boolean on whether the file has a strong checksum.
99 $ck->export_to_string($alg, %opts)
101 Return a multi-line string containing the checksums of type $alg.
102 The string can be stored as-is in a Checksum-* field of a
103 Dpkg::Control object.
104 $ck->export_to_control($control, %opts)
106 Export the checksums in the Checksums-* fields of the Dpkg::Control
107 $control object.
108
110 Version 1.04 (dpkg 1.20.0)
111 Remove warning: For obsolete property 'program'.
112 Version 1.03 (dpkg 1.18.5)
114 New property: Add new 'strong' property.
115 New member: $ck->has_strong_checksums().
117 Version 1.02 (dpkg 1.18.0)
119 Obsolete property: Getting the 'program' checksum property will warn
120 and return undef, the Digest module is used internally now.
121 New property: Add new 'name' property with the name of the Digest
123 algorithm to use.
124 Version 1.01 (dpkg 1.17.6)
126 New argument: Accept an options argument in $ck->export_to_string().
127 New option: Accept new option 'update' in $ck->add_from_file() and
129 $ck->add_from_control().
130 Version 1.00 (dpkg 1.15.6)
132 Mark the module as public.
1331.20.9 2021-05-10 Dpkg::Checksums(3perl)