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JavaInfo
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111 lines (104 loc) · 2.73 KB
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#!/usr/bin/perl
# JavaInfo - Perl utility to extract the java version info from a class file's bytecode.
# Copyright (C) 2016 Thomas Leplus
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
use strict;
use warnings;
use File::Spec::Functions;
sub main(@) {
foreach my $node (@_) {
if (!process_node($node)) {
return 1;
}
}
return 0;
}
sub process_node($) {
my $node = shift();
if (-f $node) {
return process_file($node);
} elsif (-d $node) {
return process_dir($node);
}
return 0;
}
sub process_dir($) {
my $dir = shift();
if (opendir(DIR, $dir)) {
if (my @nodes = readdir(DIR)) {
foreach my $node (no_upwards(@nodes)) {
if (!process_node(catfile($dir, $node))) {
return 1;
}
}
} else {
print STDERR "$dir: could not read directory ($!)\n";
return 1;
}
closedir(DIR);
} else {
print STDERR "$dir: could not open directory ($!)\n";
return 1;
}
return 0;
}
sub process_file($) {
my $file = shift();
if (open(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;
my $major = $fields[1] & 0x00FF;
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) {
$version = '5.0';
} elsif ($major == 50) {
$version = '6.0';
} elsif ($major == 52) {
$version = '8.0';
} elsif ($major == 53) {
$version = '9.0';
}
print "$file: Java " . $version . " [" . $minor . "/" . $major . "]\n";
} else {
print "$file: not a java class file\n";
}
} else {
print STDERR "$file: could not read file ($!)\n";
return 1;
}
close(FILE);
} else {
print STDERR "$file: could not open file ($!)\n";
return 1;
}
return 0;
}
exit main(@ARGV);