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package File::Type::Builder; |
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use strict; |
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use warnings; |
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use IO::File; |
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1168
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our $VERSION = "0.11"; |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless $self, $class; |
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return $self; |
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} |
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sub parse_magic { |
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my $self = shift; |
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my $data = shift; |
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0
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my $line = shift; |
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# storage |
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my $parsed = {}; |
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my $pattern; |
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# offsets |
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0
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$data =~ s/^([0-9a-fx]+)\s+//; |
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$parsed->{offset} = $1; |
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29
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# pattern type |
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$data =~ s/(byte | short | long | string | date | beshort | |
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belong | bedate | leshort | lelong | ledate)(\s+)?//x; |
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$parsed->{pattern_type} = $1; |
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unless ($parsed->{pattern_type} =~ m/^(string|beshort|belong)/) { |
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return undef; |
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} |
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# pattern mask, if exists; buggy? |
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if ($data =~ m/^\&/) { |
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# warn "pattern mask on line $line\n"; |
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$data =~ s/\&([a-z0-9]+)\s+//; |
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$parsed->{pattern_mask} = $1; |
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} |
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45
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# handle pattern. Somewhat complex. |
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PARSE: while ($data =~ s/(\s*\S*\s)//) { |
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# add data to pattern. stop unless we've got significant whitespace. |
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$pattern .= $1 unless $1 =~ m/^\s+$/; |
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last PARSE unless ($pattern =~ m!\\\s$!); |
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} |
51
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# then tidy up |
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return undef unless defined($pattern); |
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$pattern =~ s/\s*$// unless $pattern =~ m/\\\s$/; |
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$pattern =~ s/\\(\s)/$1/g; |
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$pattern =~ s/\\$//g; |
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$parsed->{pattern} = $pattern; |
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59
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# what's left is the MIME type |
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$data =~ s/^\s*(.*)$//; |
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$parsed->{mime_type} = $1; |
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63
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# check there's nothing undigested |
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warn "On line $line, remaining '$data'. Using anyway.\n" if length($data); |
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66
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# check we've got a mime type to return |
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if (!length($parsed->{mime_type}) |
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|| $parsed->{mime_type} !~ m!^[^/]*/[^/]*$!) { |
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# warn "On line $line, no or improper MIME type: not used\n"; |
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0
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return undef; |
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} |
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return $parsed; |
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} |
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76
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sub string { |
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1
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my $self = shift; |
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my $parsed = shift; |
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80
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my $escape = $self->_get_escapes(); |
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82
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# build a code fragment. |
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my $code; |
84
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my $tab = ''; |
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86
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if ($parsed->{offset}) { |
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$code = $self->_substr_handling($parsed->{offset}, 1024); |
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$tab = ' '; |
89
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90
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# we have to use substr to advance to the anchor |
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0
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$code .= ' if (defined $substr && $substr =~ m[^'; |
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93
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} else { |
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# can just anchor normally |
95
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0
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$code = ' if ($data =~ m[^'; |
96
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} |
97
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98
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# manipulate regex; use File::MMagic code |
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0
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my $pattern = $parsed->{pattern}; |
100
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101
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# quote metacharacters |
102
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# unless ($pattern =~ m!\\x!) { |
103
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$pattern = quotemeta($pattern); |
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$pattern =~ s/\\\\(.)/$escape->{$1}||$1/eg; |
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105
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# } |
106
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107
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$code .= $pattern; |
108
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109
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# close the [] delimited regex and return mime type |
110
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$code .= ']) {'; |
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$code .= "\n$tab return q{$parsed->{mime_type}};\n$tab }\n"; |
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113
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0
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if ($tab) { |
114
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$code .= "$tab}\n"; |
115
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} |
116
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117
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0
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return $code; |
118
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} |
119
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120
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sub be { |
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1
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my $self = shift; |
122
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0
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my $parsed = shift; |
123
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0
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my $length = shift; |
124
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125
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# build both sides of the conditional |
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my $offset = $parsed->{offset}; |
127
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my $pattern = $parsed->{pattern}; |
128
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129
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# start with substr handling |
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0
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my $code = $self->_substr_handling($offset, $length); |
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132
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# rhs: template |
133
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my $rhs; |
134
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if ($pattern =~ s/^0x//) { |
135
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$rhs = "pack('H*', '$pattern')"; |
136
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} else { |
137
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# warn "Not sure what this magic is"; |
138
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0
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return undef; |
139
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} |
140
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141
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# build condition |
142
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0
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$code .= " if ($rhs eq ".'$substr ) {'; |
143
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0
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$code .= "\n return q{$parsed->{mime_type}};\n }\n }\n"; |
144
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145
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0
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return $code; |
146
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} |
147
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148
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sub _substr_handling { |
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my $self = shift; |
150
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my ($offset, $length) = @_; |
151
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152
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0
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my $code = ' if (length $data > '.$offset.") {\n"; |
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$code .= ' $substr = substr($data, '.$offset.', '.$length.");\n"; |
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155
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return $code; |
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} |
157
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158
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sub _get_escapes { |
159
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return { n => '\n', |
160
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r => '\r', |
161
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b => '\b', |
162
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t => '\t', |
163
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f => '\f', |
164
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x => '\x', |
165
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0 => '\0', |
166
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1 => '\1', |
167
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2 => '\2', |
168
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3 => '\3', |
169
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}; |
170
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} |
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172
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1; |
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174
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__END__ |