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package Protocol::DBus::Marshal; |
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88021
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use strict; |
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use warnings; |
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use Protocol::DBus::Pack (); |
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use Protocol::DBus::Signature (); |
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4310
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our $_ENDIAN_PACK; |
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# for testing |
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our $DICT_CANONICAL; |
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# data (array ref, always), sig |
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sub marshal_le { |
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local $_ENDIAN_PACK = '<'; |
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return _marshal(@_[0, 1]); |
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} |
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# buf, buf offset, sig |
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sub unmarshal_le { |
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local $_ENDIAN_PACK = '<'; |
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return _unmarshal(@_); |
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} |
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sub marshal_be { |
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local $_ENDIAN_PACK = '>'; |
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return _marshal(@_[0, 1]); |
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} |
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sub unmarshal_be { |
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local $_ENDIAN_PACK = '>'; |
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return _unmarshal(@_); |
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} |
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36
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#---------------------------------------------------------------------- |
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38
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sub _marshal { |
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102
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102
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208
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my ($sig, $data, $buf_sr, $_data_are_not_list) = @_; |
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41
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102
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100
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216
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$buf_sr ||= \do { my $v = q<> }; |
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99
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102
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my @scts = Protocol::DBus::Signature::split($sig); |
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45
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102
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for my $si ( 0 .. $#scts ) { |
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128
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my $sct = $scts[$si]; |
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48
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128
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100
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my $datum = $_data_are_not_list ? $data : $data->[$si]; |
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50
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# Arrays |
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128
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100
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340
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if (index($sct, 'a') == 0) { |
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100
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100
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52
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6
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15
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_marshal_array( $sct, $datum, $buf_sr); |
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} |
54
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55
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# Structs are given as arrays. |
56
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elsif (index($sct, '(') == 0) { |
57
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11
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29
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Protocol::DBus::Pack::align_str($$buf_sr, 8); |
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59
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11
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my $struct_sig = substr($sig, 1, -1); |
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61
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11
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22
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_marshal( $struct_sig, $datum, $buf_sr ); |
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} |
63
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64
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# Variants are given as two-member arrays. |
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elsif ($sct eq 'v') { |
66
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19
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57
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_marshal( g => $datum->[0], $buf_sr, 1 ); |
67
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19
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40
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_marshal( $datum->[0], $datum->[1], $buf_sr, 1 ); |
68
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} |
69
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70
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# Anything else is a basic type. |
71
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else { |
72
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92
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100
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172
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if ($sct eq 'o') { |
73
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7
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50
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53
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$datum =~ m<\A/(?:[A-Za-z0-9_]+(?:/[A-Za-z0-9_]+)*)?\z> or do { |
74
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0
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0
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die "Invalid object path: “$datum”"; |
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}; |
76
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} |
77
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78
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92
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251
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Protocol::DBus::Pack::align_str($$buf_sr, Protocol::DBus::Pack::ALIGNMENT()->{$sct}); |
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80
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92
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150
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my $pack = Protocol::DBus::Pack::NUMERIC()->{$sct}; |
81
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92
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50
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66
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263
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$pack ||= Protocol::DBus::Pack::STRING()->{$sct} or do { |
82
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0
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0
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die "Unrecognized basic type: “$sct”"; |
83
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}; |
84
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85
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92
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229
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$pack = "($pack)$_ENDIAN_PACK"; |
86
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92
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347
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$$buf_sr .= pack( $pack, $datum ); |
87
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} |
88
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} |
89
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90
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102
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225
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return $buf_sr; |
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} |
92
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93
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sub _marshal_array { |
94
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6
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6
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15
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my ($sct, $data, $buf_sr) = @_; |
95
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96
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6
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19
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Protocol::DBus::Pack::align_str($$buf_sr, 4); |
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98
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# We’ll fill this in with the length below. |
99
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6
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10
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$$buf_sr .= "\0\0\0\0"; |
100
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101
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6
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12
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my $array_start = length $$buf_sr; |
102
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103
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# Per the spec, array lengths do NOT include alignment bytes |
104
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# after the length. This only affects 8-byte-aligned types. |
105
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6
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7
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my $compensate_align8; |
106
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107
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6
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13
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substr($sct, 0, 1, q<>); # chop off the leading “a” |
108
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109
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6
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100
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15
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if ($array_start % 8) { |
110
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3
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6
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$compensate_align8 = (0 == index($sct, '(')); |
111
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3
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100
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12
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$compensate_align8 ||= (0 == index($sct, '{')); |
112
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3
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50
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9
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$compensate_align8 ||= ((Protocol::DBus::Pack::ALIGNMENT()->{$sct} || 0) == 8); |
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66
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113
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} |
114
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115
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# DICT_ENTRY arrays are given as plain Perl hashes |
116
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6
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100
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50
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if (0 == index($sct, '{')) { |
117
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3
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9
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my $key_sig = substr($sct, 1, 1); |
118
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3
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8
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my $value_sig = substr($sct, 2, -1); |
119
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120
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3
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100
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20
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for my $key ( $DICT_CANONICAL ? (sort keys %$data) : keys %$data ) { |
121
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10
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26
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Protocol::DBus::Pack::align_str($$buf_sr, 8); |
122
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10
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25
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_marshal($key_sig, $key, $buf_sr, 1); |
123
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10
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24
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_marshal( $value_sig, $data->{$key}, $buf_sr, 1); |
124
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} |
125
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} |
126
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127
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# Any other array is given as an array. |
128
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else { |
129
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3
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7
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for my $item ( @$data ) { |
130
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9
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18
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_marshal($sct, $item, $buf_sr, 1); |
131
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} |
132
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} |
133
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134
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6
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13
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my $array_len = length($$buf_sr) - $array_start; |
135
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6
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100
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27
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$array_len -= 4 if $compensate_align8; |
136
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137
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6
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24
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substr( $$buf_sr, $array_start - 4, 4, pack("L$_ENDIAN_PACK", $array_len) ); |
138
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} |
139
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140
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#---------------------------------------------------------------------- |
141
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142
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sub _unmarshal { |
143
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31
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31
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65
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my ($buf_sr, $buf_offset, $sig) = @_; |
144
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145
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31
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46
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my @items; |
146
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147
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31
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41
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my $buf_start = $buf_offset; |
148
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31
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47
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my $sig_offset = 0; |
149
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150
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31
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67
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while ($sig_offset < length($sig)) { |
151
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85
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176
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my $next_sct_len = Protocol::DBus::Signature::get_sct_length($sig, $sig_offset); |
152
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153
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85
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224
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my ($item, $item_length) = _unmarshal_sct( |
154
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$buf_sr, |
155
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$buf_offset, |
156
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substr( $sig, $sig_offset, $next_sct_len ), |
157
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); |
158
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159
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85
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197
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push @items, $item; |
160
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161
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85
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118
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$buf_offset += $item_length; |
162
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85
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188
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$sig_offset += $next_sct_len; |
163
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} |
164
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165
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31
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86
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return (\@items, $buf_offset - $buf_start); |
166
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} |
167
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168
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sub unmarshal_sct_le { |
169
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0
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0
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0
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0
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return _unmarshal_sct(@_); |
170
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} |
171
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172
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sub unmarshal_sct_be { |
173
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0
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0
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0
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0
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return _unmarshal_sct(@_); |
174
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} |
175
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176
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# SCT = “single complete type”. |
177
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# Returns the value plus its marshaled length. |
178
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sub _unmarshal_sct { |
179
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243
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243
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485
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my ($buf_sr, $buf_offset, $sct_sig) = @_; |
180
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181
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243
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332
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my $buf_start = $buf_offset; |
182
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183
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243
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100
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677
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if (substr($sct_sig, 0, 1) eq 'a') { |
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100
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100
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184
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15
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40
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Protocol::DBus::Pack::align($buf_offset, 4); |
185
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186
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15
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47
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my $array_len = unpack "\@$buf_offset L$_ENDIAN_PACK", $$buf_sr; |
187
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15
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22
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$buf_offset += 4; #uint32 length |
188
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189
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15
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25
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my $obj; |
190
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191
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# We parse arrays of DICT_ENTRY into a hash. |
192
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15
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100
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30
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if (substr($sct_sig, 1, 1) eq '{') { |
193
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194
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# The key is always a basic type, so just one letter. |
195
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8
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15
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my $key_type = substr($sct_sig, 2, 1); |
196
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197
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# The value can be any SCT. |
198
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8
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19
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my $value_type = substr( $sct_sig, 3, Protocol::DBus::Signature::get_sct_length($sct_sig, 3) ); |
199
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200
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8
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20
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$obj = _unmarshal_to_hashref($buf_sr, $buf_offset, $array_len, $key_type, $value_type); |
201
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8
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26
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$buf_offset += $array_len; |
202
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} |
203
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204
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# Anything else we parse normally. |
205
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else { |
206
|
7
|
|
|
|
|
22
|
my $array_sig = substr( $sct_sig, 1, Protocol::DBus::Signature::get_sct_length($sct_sig, 1) ); |
207
|
|
|
|
|
|
|
|
208
|
7
|
|
|
|
|
14
|
my @array_items; |
209
|
7
|
|
|
|
|
23
|
$obj = bless \@array_items, 'Protocol::DBus::Type::Array'; |
210
|
|
|
|
|
|
|
|
211
|
|
|
|
|
|
|
# If the array contents are 8-byte-aligned, then the array will |
212
|
|
|
|
|
|
|
# actually be 4 bytes longer than this. But it doesn’t appear we |
213
|
|
|
|
|
|
|
# need to care about that since _unmarshal_sct() accounts for that. |
214
|
7
|
|
|
|
|
14
|
my $array_end = $buf_offset + $array_len; |
215
|
|
|
|
|
|
|
|
216
|
7
|
|
|
|
|
17
|
while ($buf_offset < $array_end) { |
217
|
18
|
|
|
|
|
38
|
my ($item, $item_length) = _unmarshal_sct($buf_sr, $buf_offset, $array_sig); |
218
|
|
|
|
|
|
|
|
219
|
18
|
|
|
|
|
27
|
$buf_offset += $item_length; |
220
|
|
|
|
|
|
|
|
221
|
18
|
|
|
|
|
48
|
push @array_items, $item; |
222
|
|
|
|
|
|
|
} |
223
|
|
|
|
|
|
|
} |
224
|
|
|
|
|
|
|
|
225
|
15
|
|
|
|
|
35
|
return ($obj, $buf_offset - $buf_start); |
226
|
|
|
|
|
|
|
} |
227
|
|
|
|
|
|
|
elsif (substr($sct_sig, 0, 1) eq '(') { |
228
|
12
|
|
|
|
|
31
|
return _unmarshal_struct(@_); |
229
|
|
|
|
|
|
|
} |
230
|
|
|
|
|
|
|
elsif (substr($sct_sig, 0, 1) eq 'v') { |
231
|
39
|
|
|
|
|
77
|
return _unmarshal_variant(@_); |
232
|
|
|
|
|
|
|
} |
233
|
|
|
|
|
|
|
|
234
|
177
|
|
|
|
|
320
|
my ($pack_tmpl, $is_string) = _get_pack_template($sct_sig); |
235
|
|
|
|
|
|
|
|
236
|
177
|
|
|
|
|
469
|
Protocol::DBus::Pack::align($buf_offset, Protocol::DBus::Pack::ALIGNMENT()->{$sct_sig}); |
237
|
|
|
|
|
|
|
|
238
|
177
|
|
|
|
|
564
|
my $val = unpack("\@$buf_offset ($pack_tmpl)$_ENDIAN_PACK", $$buf_sr); |
239
|
|
|
|
|
|
|
|
240
|
177
|
100
|
|
|
|
537
|
return ($val, $buf_offset - $buf_start + Protocol::DBus::Pack::WIDTH()->{$sct_sig} + ($is_string ? length($val) : 0)); |
241
|
|
|
|
|
|
|
} |
242
|
|
|
|
|
|
|
|
243
|
|
|
|
|
|
|
sub _unmarshal_variant { |
244
|
39
|
|
|
39
|
|
72
|
my ($buf_sr, $buf_offset) = @_; |
245
|
|
|
|
|
|
|
|
246
|
39
|
|
|
|
|
51
|
my $buf_start = $buf_offset; |
247
|
|
|
|
|
|
|
|
248
|
39
|
|
|
|
|
77
|
my ($sig, $len) = _unmarshal_sct( $buf_sr, $buf_offset, 'g' ); |
249
|
|
|
|
|
|
|
|
250
|
39
|
50
|
|
|
|
85
|
die sprintf("No sig ($len bytes?) from “%s”?", substr($$buf_sr, $buf_offset)) if !length $sig; |
251
|
|
|
|
|
|
|
|
252
|
39
|
|
|
|
|
57
|
$buf_offset += $len; |
253
|
|
|
|
|
|
|
|
254
|
39
|
|
|
|
|
75
|
(my $val, $len) = _unmarshal_sct( $buf_sr, $buf_offset, $sig ); |
255
|
|
|
|
|
|
|
|
256
|
39
|
|
|
|
|
102
|
return( $val, $len + $buf_offset - $buf_start ); |
257
|
|
|
|
|
|
|
} |
258
|
|
|
|
|
|
|
|
259
|
|
|
|
|
|
|
sub _get_pack_template { |
260
|
177
|
|
|
177
|
|
282
|
my ($sct_sig) = @_; |
261
|
|
|
|
|
|
|
|
262
|
177
|
|
|
|
|
268
|
my ($is_string, $pack_tmpl); |
263
|
177
|
100
|
|
|
|
379
|
if ( $pack_tmpl = Protocol::DBus::Pack::STRING()->{$sct_sig} ) { |
264
|
83
|
|
|
|
|
111
|
$is_string = 1; |
265
|
|
|
|
|
|
|
} |
266
|
|
|
|
|
|
|
else { |
267
|
94
|
50
|
|
|
|
229
|
$pack_tmpl = Protocol::DBus::Pack::NUMERIC()->{$sct_sig} or do { |
268
|
0
|
|
|
|
|
0
|
die "No basic type template for type “$sct_sig”!"; |
269
|
|
|
|
|
|
|
}; |
270
|
|
|
|
|
|
|
} |
271
|
|
|
|
|
|
|
|
272
|
177
|
|
|
|
|
354
|
return ($pack_tmpl, $is_string); |
273
|
|
|
|
|
|
|
} |
274
|
|
|
|
|
|
|
|
275
|
|
|
|
|
|
|
sub _unmarshal_to_hashref { |
276
|
8
|
|
|
8
|
|
18
|
my ($buf_sr, $buf_offset, $array_len, $key_type, $value_type) = @_; |
277
|
|
|
|
|
|
|
|
278
|
8
|
|
|
|
|
13
|
my %items; |
279
|
8
|
|
|
|
|
26
|
my $obj = bless \%items, 'Protocol::DBus::Type::Dict'; |
280
|
|
|
|
|
|
|
|
281
|
8
|
|
|
|
|
23
|
Protocol::DBus::Pack::align($buf_offset, 8); |
282
|
|
|
|
|
|
|
|
283
|
8
|
|
|
|
|
13
|
my $end_offset = $buf_offset + $array_len; |
284
|
|
|
|
|
|
|
|
285
|
8
|
|
|
|
|
30
|
while ($buf_offset < $end_offset) { |
286
|
31
|
|
|
|
|
79
|
Protocol::DBus::Pack::align($buf_offset, 8); |
287
|
|
|
|
|
|
|
|
288
|
31
|
|
|
|
|
62
|
my ($key, $len_in_buf) = _unmarshal_sct($buf_sr, $buf_offset, $key_type); |
289
|
|
|
|
|
|
|
|
290
|
31
|
|
|
|
|
47
|
$buf_offset += $len_in_buf; |
291
|
|
|
|
|
|
|
|
292
|
31
|
|
|
|
|
56
|
(my $val, $len_in_buf) = _unmarshal_sct($buf_sr, $buf_offset, $value_type); |
293
|
|
|
|
|
|
|
|
294
|
31
|
|
|
|
|
46
|
$buf_offset += $len_in_buf; |
295
|
|
|
|
|
|
|
|
296
|
31
|
|
|
|
|
90
|
$items{$key} = $val; |
297
|
|
|
|
|
|
|
} |
298
|
|
|
|
|
|
|
|
299
|
|
|
|
|
|
|
# We don’t need to return the length. |
300
|
8
|
|
|
|
|
17
|
return $obj; |
301
|
|
|
|
|
|
|
} |
302
|
|
|
|
|
|
|
|
303
|
|
|
|
|
|
|
sub _unmarshal_struct { |
304
|
12
|
|
|
12
|
|
46
|
my ($buf_sr, $buf_offset, $sct_sig) = @_; |
305
|
|
|
|
|
|
|
|
306
|
|
|
|
|
|
|
# Remove “()” and just parse as a series of types. |
307
|
12
|
|
|
|
|
38
|
chop $sct_sig; |
308
|
12
|
|
|
|
|
19
|
substr( $sct_sig, 0, 1, q<> ); |
309
|
|
|
|
|
|
|
|
310
|
12
|
|
|
|
|
21
|
my $buf_start = $buf_offset; |
311
|
|
|
|
|
|
|
|
312
|
12
|
|
|
|
|
29
|
Protocol::DBus::Pack::align($buf_offset, 8); |
313
|
|
|
|
|
|
|
|
314
|
12
|
|
|
|
|
25
|
my ($items_ar, $len) = _unmarshal($buf_sr, $buf_offset, $sct_sig); |
315
|
12
|
|
|
|
|
29
|
bless $items_ar, 'Protocol::DBus::Type::Struct'; |
316
|
|
|
|
|
|
|
|
317
|
12
|
|
|
|
|
32
|
return ($items_ar, ($buf_offset - $buf_start) + $len); |
318
|
|
|
|
|
|
|
} |
319
|
|
|
|
|
|
|
|
320
|
|
|
|
|
|
|
#---------------------------------------------------------------------- |
321
|
|
|
|
|
|
|
# The logic below is unused. I was under the impression that I’d need a |
322
|
|
|
|
|
|
|
# way to determine if a message body’s length matches the given SIGNATURE, |
323
|
|
|
|
|
|
|
# but of course we don’t because the header includes the body length. |
324
|
|
|
|
|
|
|
#---------------------------------------------------------------------- |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
sub buffer_length_satisfies_signature_le { |
327
|
19
|
|
|
19
|
0
|
51393
|
local $_ENDIAN_PACK = '<'; |
328
|
19
|
|
|
|
|
42
|
return (_buffer_length_satisfies_signature(@_))[0]; |
329
|
|
|
|
|
|
|
} |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
sub buffer_length_satisfies_signature_be { |
332
|
0
|
|
|
0
|
0
|
0
|
local $_ENDIAN_PACK = '>'; |
333
|
0
|
|
|
|
|
0
|
return (_buffer_length_satisfies_signature(@_))[0]; |
334
|
|
|
|
|
|
|
} |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
sub _buffer_length_satisfies_signature { |
337
|
25
|
|
|
25
|
|
70
|
my ($buf, $buf_offset, $sig) = @_; |
338
|
|
|
|
|
|
|
|
339
|
25
|
|
|
|
|
43
|
my $sig_offset = 0; |
340
|
|
|
|
|
|
|
|
341
|
25
|
|
|
|
|
59
|
while ($buf_offset <= length($buf)) { |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
# We’re good if this passes because it means the buffer is longer |
344
|
|
|
|
|
|
|
# than the passed-in signature needs it to be. |
345
|
52
|
100
|
|
|
|
135
|
return (1, $buf_offset) if $sig_offset == length($sig); |
346
|
|
|
|
|
|
|
|
347
|
41
|
|
|
|
|
89
|
my $sct_length = Protocol::DBus::Signature::get_sct_length($sig, $sig_offset); |
348
|
|
|
|
|
|
|
|
349
|
41
|
|
|
|
|
77
|
my $next_sct = substr( |
350
|
|
|
|
|
|
|
$sig, |
351
|
|
|
|
|
|
|
$sig_offset, |
352
|
|
|
|
|
|
|
$sct_length, |
353
|
|
|
|
|
|
|
); |
354
|
|
|
|
|
|
|
|
355
|
41
|
|
|
|
|
60
|
$sig_offset += $sct_length; |
356
|
|
|
|
|
|
|
|
357
|
41
|
50
|
|
|
|
142
|
if ($next_sct eq 'v') { |
|
|
50
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
358
|
0
|
|
|
|
|
0
|
my ($variant_sig, $len) = _unmarshal_sct($buf, $buf_offset, 'g'); |
359
|
0
|
|
|
|
|
0
|
$buf_offset += $len; |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
# This has to recurse and preserve the offset. |
362
|
0
|
|
|
|
|
0
|
my ($ok, $new_offset) = _buffer_length_satisfies_signature( $buf, $buf_offset, $variant_sig ); |
363
|
0
|
0
|
|
|
|
0
|
return 0 if !$ok; |
364
|
0
|
|
|
|
|
0
|
$buf_offset = $new_offset; |
365
|
|
|
|
|
|
|
} |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
# signatures |
368
|
|
|
|
|
|
|
elsif ($next_sct eq 'g') { |
369
|
|
|
|
|
|
|
# 2 for the length byte and the trailing NUL |
370
|
0
|
|
|
|
|
0
|
$buf_offset += 2 + unpack( "\@$buf_offset C", $buf ) |
371
|
|
|
|
|
|
|
} |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
# strings and object paths |
374
|
|
|
|
|
|
|
elsif ( Protocol::DBus::Pack::STRING()->{$next_sct} ) { |
375
|
3
|
|
|
|
|
8
|
_add_uint32_variant_length(\$buf, \$buf_offset); |
376
|
3
|
|
|
|
|
7
|
$buf_offset++; #trailing NUL |
377
|
|
|
|
|
|
|
} |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
# numerics |
380
|
|
|
|
|
|
|
elsif ( my $width = Protocol::DBus::Pack::WIDTH()->{$next_sct} ) { |
381
|
20
|
|
|
|
|
36
|
$buf_offset += $width; |
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
else { |
385
|
18
|
|
|
|
|
29
|
my $char0 = substr($next_sct, 0, 1); |
386
|
|
|
|
|
|
|
|
387
|
18
|
100
|
|
|
|
37
|
if ($char0 eq 'a') { |
|
|
50
|
|
|
|
|
|
388
|
12
|
|
|
|
|
28
|
_add_uint32_variant_length(\$buf, \$buf_offset); |
389
|
|
|
|
|
|
|
} |
390
|
|
|
|
|
|
|
elsif ($char0 eq '(') { |
391
|
6
|
|
|
|
|
18
|
Protocol::DBus::Pack::align( $buf_offset, 8 ); |
392
|
|
|
|
|
|
|
|
393
|
6
|
|
|
|
|
20
|
my ($ok, $new_offset) = _buffer_length_satisfies_signature( $buf, $buf_offset, substr($next_sct, 1, -1) ); |
394
|
6
|
100
|
|
|
|
27
|
return 0 if !$ok; |
395
|
2
|
|
|
|
|
5
|
$buf_offset = $new_offset; |
396
|
|
|
|
|
|
|
} |
397
|
|
|
|
|
|
|
else { |
398
|
0
|
|
|
|
|
0
|
die "unrecognized SCT: “$next_sct”"; |
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
} |
401
|
|
|
|
|
|
|
} |
402
|
|
|
|
|
|
|
|
403
|
10
|
|
|
|
|
43
|
return 0; |
404
|
|
|
|
|
|
|
} |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
sub _add_uint32_variant_length { |
407
|
15
|
|
|
15
|
|
26
|
my ($buf_sr, $buf_offset_sr) = @_; |
408
|
|
|
|
|
|
|
|
409
|
15
|
|
|
|
|
44
|
Protocol::DBus::Pack::align( $$buf_offset_sr, 4 ); |
410
|
|
|
|
|
|
|
|
411
|
15
|
50
|
|
|
|
66
|
my $array_len = unpack( |
412
|
|
|
|
|
|
|
"\@$$buf_offset_sr " . ($_ENDIAN_PACK eq '<' ? 'V' : 'N'), |
413
|
|
|
|
|
|
|
$$buf_sr, |
414
|
|
|
|
|
|
|
); |
415
|
|
|
|
|
|
|
|
416
|
15
|
|
|
|
|
26
|
$$buf_offset_sr += 4; |
417
|
15
|
|
|
|
|
20
|
$$buf_offset_sr += $array_len; |
418
|
|
|
|
|
|
|
|
419
|
15
|
|
|
|
|
40
|
return; |
420
|
|
|
|
|
|
|
} |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
1; |