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#!/usr/bin/perl
# Used to generate regionName.c
# usage: ./generate_regionName.pl > ../libGeoIP/regionName.c
# Usually run update-region-codes.pl before generate_regionName.pl like
#
# ./update-region-codes.pl
# ./generate_regionName.pl > ../libGeoIP/regionName.c
use strict;
use warnings;
use autodie;
use Text::CSV_XS ();
my $last_country_code = q{};
my @country_codes;
my @region_code2s;
my @region_names;
sub init_variables () {
$last_country_code = q{};
}
sub parse_file {
# http://geolite.maxmind.com/download/geoip/misc/region_codes.csv
open my $fh, '<:encoding(latin1)', 'region_codes.csv';
<$fh>;
my $csv = Text::CSV_XS->new( { binary => 1, auto_diag => 1 } );
while ( my $row = $csv->getline($fh) ) {
my ( $country_code, $region_code, $name ) = @{$row};
my $region_code2;
if ( $country_code eq 'US' || $country_code eq 'CA' ) {
$region_code =~ /^[A-Z]{2}$/ or die "Wrong region code";
$region_code2
= ( ( ord( substr( $region_code, 0, 1 ) ) - 48 )
* ( 65 + 26 - 48 ) )
+ ord( substr( $region_code, 1, 1 ) )
- 48 + 100;
}
else {
if ( $region_code =~ /^\d\d$/ ) {
$region_code2
= ( ord( substr( $region_code, 0, 1 ) ) - 48 ) * 10
+ ord( substr( $region_code, 1, 1 ) )
- 48;
}
elsif ( $region_code =~ /^[A-Z0-9]{2}$/ ) {
$region_code2
= ( ( ord( substr( $region_code, 0, 1 ) ) - 48 )
* ( 65 + 26 - 48 ) )
+ ord( substr( $region_code, 1, 1 ) )
- 48 + 100;
}
else {
die "Region code seems wrong $region_code\n";
}
}
die q{region name cannot contain a quote (")} if $name =~ /"/;
readcode( $country_code, $region_code, $region_code2, $name );
}
close $fh;
}
sub generate_region_name_functions {
my $i = 0;
for my $country_code (@country_codes) {
# function head
if ( $last_country_code ne $country_code ) {
if ( $last_country_code ne q{} ) {
print " default:\n return NULL;\n";
print " }\n"; # switch end
print "}\n"; # function get_region_name_XX end
}
$last_country_code = $country_code;
print "\nstatic const char * get_region_name_" . $country_code
. "(int region_code)\n"; # function begin
print "{\n";
print " switch(region_code) {\n"; # switch end
}
print " case " . $region_code2s[$i] . ":\n";
print qq{ return "$region_names[$i]";\n};
$i++;
}
if ( $last_country_code ne "" ) {
print " default:\n return NULL;\n";
print " }\n"; # switch end
print "}\n"; # function get_region_name_XX end
}
}
# read code to collect to array
sub readcode {
my ( $country_code, $region_code, $region_code2, $name ) = @_;
push( @country_codes, $country_code );
push( @region_code2s, $region_code2 );
push( @region_names, $name );
}
sub generate_region_condition () {
for my $country_code (@country_codes) {
if ( $last_country_code ne $country_code ) {
$last_country_code = $country_code;
print " if (strcmp(country_code," . qq(")
. $last_country_code . qq(")
. ") == 0) {\n"; # if condition
print " return get_region_name_"
. $last_country_code
. "(region_code2);\n";
print " }\n"; # function get_region_name_XX end
}
}
}
# implementation of GeoIP_region_name_by_code
sub generate_api_function {
print <<__C_CODE__;
const char * GeoIP_region_name_by_code(const char * country_code,const char * region_code) {
int region_code2 = -1;
if (region_code == NULL) { return NULL; }
if ( ((region_code[0] >= 48) && (region_code[0] < (48 + 10)))
&& ((region_code[1] >= 48) && (region_code[1] < (48 + 10)))
) {
/* only numbers, that shortens the large switch statements */
region_code2 = (region_code[0] - 48) * 10 + region_code[1] - 48;
}
else if ( ( ((region_code[0] >= 65) && (region_code[0] < (65 + 26)))
|| ((region_code[0] >= 48) && (region_code[0] < (48 + 10))))
&& ( ((region_code[1] >= 65) && (region_code[1] < (65 + 26)))
|| ((region_code[1] >= 48) && (region_code[1] < (48 + 10))))
) {
region_code2 = (region_code[0] - 48) * (65 + 26 - 48) + region_code[1] - 48 + 100;
}
if (region_code2 == -1) {return NULL;}
__C_CODE__
init_variables();
generate_region_condition();
# function end
print " return NULL;\n";
print "}\n";
}
parse_file();
init_variables();
print qq{#include "GeoIP.h"\n};
print "#include <string.h>\n";
print "#include <stdio.h>\n\n";
generate_region_name_functions();
generate_api_function();
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