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JavaInfo
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77 lines (71 loc) · 1.62 KB
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#!/usr/bin/perl
use strict;
use warnings;
use File::Spec::Functions;
sub main {
foreach my $node (@_) {
process_node($node);
}
}
sub process_node {
my $node = shift();
if (-f $node) {
process_file($node);
} elsif (-d $node) {
process_dir($node);
}
}
sub process_dir {
my $dir = shift();
if (opendir(my $DIR, $dir)) {
if (my @nodes = readdir(DIR)) {
foreach my $node (no_upwards(@nodes)) {
process_node(catfile($dir, $node));
}
} else {
die "$dir: could not read directory ($!)\n";
}
closedir(DIR);
} else {
die "$dir: could not open directory ($!)\n";
}
}
sub process_file {
my $file = shift();
if (open(my $FILE, '<', $file)) {
binmode($FILE);
my $buffer;
if (read(FILE, $buffer, 8)) {
my @fields = unpack('NN', $buffer);
if ($fields[0] == 0xCAFEBABE) {
my $minor = ($fields[1] & 0xFF00) >> 16; ## no critic [Use of bitwise operator]: indeed
my $major = $fields[1] & 0x00FF; ## no critic [Use of bitwise operator]: indeed
my $version = '';
if ($major == 45) {
if ($minor <= 3) {
$version = '1.0.2';
} else {
$version = '1.1.8';
}
} elsif ($major == 46) {
$version = '1.2.2';
} elsif ($major == 47) {
$version = '1.3.1';
} elsif ($major == 48) {
$version = '1.4.2';
} elsif ($major >= 49) {
$version = ($major - 44);
}
print "$file: Java " . $version . " [" . $minor . "/" . $major . "]\n";
} else {
die "$file: not a java class file\n";
}
} else {
die "$file: could not read file ($!)\n";
}
close($FILE);
} else {
die "$file: could not open file ($!)\n";
}
}
main(@ARGV);