1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
package IO::Compress::Zlib::Extra;
require 5.004 ;
use strict ;
use warnings;
use bytes;
our ($VERSION, @ISA, @EXPORT_OK, %EXPORT_TAGS);
$VERSION = '2.027';
use IO::Compress::Gzip::Constants 2.027 ;
sub ExtraFieldError
{
return $_[0];
return "Error with ExtraField Parameter: $_[0]" ;
}
sub validateExtraFieldPair
{
my $pair = shift ;
my $strict = shift;
my $gzipMode = shift ;
return ExtraFieldError("Not an array ref")
unless ref $pair && ref $pair eq 'ARRAY';
return ExtraFieldError("SubField must have two parts")
unless @$pair == 2 ;
return ExtraFieldError("SubField ID is a reference")
if ref $pair->[0] ;
return ExtraFieldError("SubField Data is a reference")
if ref $pair->[1] ;
# ID is exactly two chars
return ExtraFieldError("SubField ID not two chars long")
unless length $pair->[0] == GZIP_FEXTRA_SUBFIELD_ID_SIZE ;
# Check that the 2nd byte of the ID isn't 0
return ExtraFieldError("SubField ID 2nd byte is 0x00")
if $strict && $gzipMode && substr($pair->[0], 1, 1) eq "\x00" ;
return ExtraFieldError("SubField Data too long")
if length $pair->[1] > GZIP_FEXTRA_SUBFIELD_MAX_SIZE ;
return undef ;
}
sub parseRawExtra
{
my $data = shift ;
my $extraRef = shift;
my $strict = shift;
my $gzipMode = shift ;
#my $lax = shift ;
#return undef
# if $lax ;
my $XLEN = length $data ;
return ExtraFieldError("Too Large")
if $XLEN > GZIP_FEXTRA_MAX_SIZE;
my $offset = 0 ;
while ($offset < $XLEN) {
return ExtraFieldError("Truncated in FEXTRA Body Section")
if $offset + GZIP_FEXTRA_SUBFIELD_HEADER_SIZE > $XLEN ;
my $id = substr($data, $offset, GZIP_FEXTRA_SUBFIELD_ID_SIZE);
$offset += GZIP_FEXTRA_SUBFIELD_ID_SIZE;
my $subLen = unpack("v", substr($data, $offset,
GZIP_FEXTRA_SUBFIELD_LEN_SIZE));
$offset += GZIP_FEXTRA_SUBFIELD_LEN_SIZE ;
return ExtraFieldError("Truncated in FEXTRA Body Section")
if $offset + $subLen > $XLEN ;
my $bad = validateExtraFieldPair( [$id,
substr($data, $offset, $subLen)],
$strict, $gzipMode );
return $bad if $bad ;
push @$extraRef, [$id => substr($data, $offset, $subLen)]
if defined $extraRef;;
$offset += $subLen ;
}
return undef ;
}
sub mkSubField
{
my $id = shift ;
my $data = shift ;
return $id . pack("v", length $data) . $data ;
}
sub parseExtraField
{
my $dataRef = $_[0];
my $strict = $_[1];
my $gzipMode = $_[2];
#my $lax = @_ == 2 ? $_[1] : 1;
# ExtraField can be any of
#
# -ExtraField => $data
#
# -ExtraField => [$id1, $data1,
# $id2, $data2]
# ...
# ]
#
# -ExtraField => [ [$id1 => $data1],
# [$id2 => $data2],
# ...
# ]
#
# -ExtraField => { $id1 => $data1,
# $id2 => $data2,
# ...
# }
if ( ! ref $dataRef ) {
return undef
if ! $strict;
return parseRawExtra($dataRef, undef, 1, $gzipMode);
}
#my $data = $$dataRef;
my $data = $dataRef;
my $out = '' ;
if (ref $data eq 'ARRAY') {
if (ref $data->[0]) {
foreach my $pair (@$data) {
return ExtraFieldError("Not list of lists")
unless ref $pair eq 'ARRAY' ;
my $bad = validateExtraFieldPair($pair, $strict, $gzipMode) ;
return $bad if $bad ;
$out .= mkSubField(@$pair);
}
}
else {
return ExtraFieldError("Not even number of elements")
unless @$data % 2 == 0;
for (my $ix = 0; $ix <= length(@$data) -1 ; $ix += 2) {
my $bad = validateExtraFieldPair([$data->[$ix],
$data->[$ix+1]],
$strict, $gzipMode) ;
return $bad if $bad ;
$out .= mkSubField($data->[$ix], $data->[$ix+1]);
}
}
}
elsif (ref $data eq 'HASH') {
while (my ($id, $info) = each %$data) {
my $bad = validateExtraFieldPair([$id, $info], $strict, $gzipMode);
return $bad if $bad ;
$out .= mkSubField($id, $info);
}
}
else {
return ExtraFieldError("Not a scalar, array ref or hash ref") ;
}
return ExtraFieldError("Too Large")
if length $out > GZIP_FEXTRA_MAX_SIZE;
$_[0] = $out ;
return undef;
}
1;
__END__
|
