Subversion Repositories php_utils

<?php

/*

 * ISO/IEC 7816-5 Application Identifier decoder for PHP

 * Copyright 2022 Daniel Marschall, ViaThinkSoft

 * Version 2022-08-19

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

#test2('A000000051AABBCC');

#test2('B01234567890');

#test2('D276000098AABBCCDDEEFFAABBCCDDEE');

#test2('F01234567890');

test('91234FFF999');

test('51234FFF999');

function test2($aid) {

        while ($aid != '') {

                echo test($aid);

                $aid = substr($aid,0,strlen($aid)-1);

        }

}

function test($aid) {

        $out = _decode_aid($aid);

        $max_key_len = 32; // min width of first column

        foreach ($out as $a) {

                if (is_array($a)) {

                        $max_key_len = max($max_key_len,strlen($a[0]));

                }

        }

        foreach ($out as $a) {

                if (is_array($a)) {

                        echo str_pad($a[0],$max_key_len,' ',STR_PAD_RIGHT).'  '.$a[1]."\n";

                } else {

                        echo $a."\n";

                }

        }

        echo "\n";

}

*/

# ---

function decode_aid($aid,$compact=true) {

        $sout = '';

        $out = _decode_aid($aid);

        if ($compact) {

                $max_key_len = 0;

                foreach ($out as $a) {

                        if (is_array($a)) {

                                $max_key_len = max($max_key_len,strlen($a[0]));

                        }

                }

        } else {

                $max_key_len = 32; // 16 bytes

        }

        foreach ($out as $a) {

                if (is_array($a)) {

                        $sout .= str_pad($a[0],$max_key_len,' ',STR_PAD_RIGHT).'   '.$a[1]."\n";

                } else {

                        $sout .= $a."\n";

                }

        }

        return $sout;

}

function _is_bcd($num) {

        return preg_match('@^[0-9]+$@', $num, $m);

}

function _decode_aid($aid) {

        // based on https://github.com/thephpleague/iso3166/blob/main/src/ISO3166.php

        // commit 26.07.2022

        // Generated using:

        /*

        $x = new ISO3166();

        $bla = $x->all();

        foreach ($bla as $data) {

                $out[] = "\t\$iso3166['".$data['numeric']."'] = \"".$data['name']."\";\n";

        }

        */

        $iso3166['004'] = "Afghanistan";

        $iso3166['248'] = "Åland Islands";

        $iso3166['008'] = "Albania";

        $iso3166['012'] = "Algeria";

        $iso3166['016'] = "American Samoa";

        $iso3166['020'] = "Andorra";

        $iso3166['024'] = "Angola";

        $iso3166['660'] = "Anguilla";

        $iso3166['010'] = "Antarctica";

        $iso3166['028'] = "Antigua and Barbuda";

        $iso3166['032'] = "Argentina";

        $iso3166['051'] = "Armenia";

        $iso3166['533'] = "Aruba";

        $iso3166['036'] = "Australia";

        $iso3166['040'] = "Austria";

        $iso3166['031'] = "Azerbaijan";

        $iso3166['044'] = "Bahamas";

        $iso3166['048'] = "Bahrain";

        $iso3166['050'] = "Bangladesh";

        $iso3166['052'] = "Barbados";

        $iso3166['112'] = "Belarus";

        $iso3166['056'] = "Belgium";

        $iso3166['084'] = "Belize";

        $iso3166['204'] = "Benin";

        $iso3166['060'] = "Bermuda";

        $iso3166['064'] = "Bhutan";

        $iso3166['068'] = "Bolivia (Plurinational State of)";

        $iso3166['535'] = "Bonaire, Sint Eustatius and Saba";

        $iso3166['070'] = "Bosnia and Herzegovina";

        $iso3166['072'] = "Botswana";

        $iso3166['074'] = "Bouvet Island";

        $iso3166['076'] = "Brazil";

        $iso3166['086'] = "British Indian Ocean Territory";

        $iso3166['096'] = "Brunei Darussalam";

        $iso3166['100'] = "Bulgaria";

        $iso3166['854'] = "Burkina Faso";

        $iso3166['108'] = "Burundi";

        $iso3166['132'] = "Cabo Verde";

        $iso3166['116'] = "Cambodia";

        $iso3166['120'] = "Cameroon";

        $iso3166['124'] = "Canada";

        $iso3166['136'] = "Cayman Islands";

        $iso3166['140'] = "Central African Republic";

        $iso3166['148'] = "Chad";

        $iso3166['152'] = "Chile";

        $iso3166['156'] = "China";

        $iso3166['162'] = "Christmas Island";

        $iso3166['166'] = "Cocos (Keeling) Islands";

        $iso3166['170'] = "Colombia";

        $iso3166['174'] = "Comoros";

        $iso3166['178'] = "Congo";

        $iso3166['180'] = "Congo (Democratic Republic of the)";

        $iso3166['184'] = "Cook Islands";

        $iso3166['188'] = "Costa Rica";

        $iso3166['384'] = "Côte d'Ivoire";

        $iso3166['191'] = "Croatia";

        $iso3166['192'] = "Cuba";

        $iso3166['531'] = "Curaçao";

        $iso3166['196'] = "Cyprus";

        $iso3166['203'] = "Czechia";

        $iso3166['208'] = "Denmark";

        $iso3166['262'] = "Djibouti";

        $iso3166['212'] = "Dominica";

        $iso3166['214'] = "Dominican Republic";

        $iso3166['218'] = "Ecuador";

        $iso3166['818'] = "Egypt";

        $iso3166['222'] = "El Salvador";

        $iso3166['226'] = "Equatorial Guinea";

        $iso3166['232'] = "Eritrea";

        $iso3166['233'] = "Estonia";

        $iso3166['231'] = "Ethiopia";

        $iso3166['748'] = "Eswatini";

        $iso3166['238'] = "Falkland Islands (Malvinas)";

        $iso3166['234'] = "Faroe Islands";

        $iso3166['242'] = "Fiji";

        $iso3166['246'] = "Finland";

        $iso3166['250'] = "France";

        $iso3166['254'] = "French Guiana";

        $iso3166['258'] = "French Polynesia";

        $iso3166['260'] = "French Southern Territories";

        $iso3166['266'] = "Gabon";

        $iso3166['270'] = "Gambia";

        $iso3166['268'] = "Georgia";

        $iso3166['276'] = "Germany";

        $iso3166['288'] = "Ghana";

        $iso3166['292'] = "Gibraltar";

        $iso3166['300'] = "Greece";

        $iso3166['304'] = "Greenland";

        $iso3166['308'] = "Grenada";

        $iso3166['312'] = "Guadeloupe";

        $iso3166['316'] = "Guam";

        $iso3166['320'] = "Guatemala";

        $iso3166['831'] = "Guernsey";

        $iso3166['324'] = "Guinea";

        $iso3166['624'] = "Guinea-Bissau";

        $iso3166['328'] = "Guyana";

        $iso3166['332'] = "Haiti";

        $iso3166['334'] = "Heard Island and McDonald Islands";

        $iso3166['336'] = "Holy See";

        $iso3166['340'] = "Honduras";

        $iso3166['344'] = "Hong Kong";

        $iso3166['348'] = "Hungary";

        $iso3166['352'] = "Iceland";

        $iso3166['356'] = "India";

        $iso3166['360'] = "Indonesia";

        $iso3166['364'] = "Iran (Islamic Republic of)";

        $iso3166['368'] = "Iraq";

        $iso3166['372'] = "Ireland";

        $iso3166['833'] = "Isle of Man";

        $iso3166['376'] = "Israel";

        $iso3166['380'] = "Italy";

        $iso3166['388'] = "Jamaica";

        $iso3166['392'] = "Japan";

        $iso3166['832'] = "Jersey";

        $iso3166['400'] = "Jordan";

        $iso3166['398'] = "Kazakhstan";

        $iso3166['404'] = "Kenya";

        $iso3166['296'] = "Kiribati";

        $iso3166['408'] = "Korea (Democratic People's Republic of)";

        $iso3166['410'] = "Korea (Republic of)";

        $iso3166['414'] = "Kuwait";

        $iso3166['417'] = "Kyrgyzstan";

        $iso3166['418'] = "Lao People's Democratic Republic";

        $iso3166['428'] = "Latvia";

        $iso3166['422'] = "Lebanon";

        $iso3166['426'] = "Lesotho";

        $iso3166['430'] = "Liberia";

        $iso3166['434'] = "Libya";

        $iso3166['438'] = "Liechtenstein";

        $iso3166['440'] = "Lithuania";

        $iso3166['442'] = "Luxembourg";

        $iso3166['446'] = "Macao";

        $iso3166['807'] = "North Macedonia";

        $iso3166['450'] = "Madagascar";

        $iso3166['454'] = "Malawi";

        $iso3166['458'] = "Malaysia";

        $iso3166['462'] = "Maldives";

        $iso3166['466'] = "Mali";

        $iso3166['470'] = "Malta";

        $iso3166['584'] = "Marshall Islands";

        $iso3166['474'] = "Martinique";

        $iso3166['478'] = "Mauritania";

        $iso3166['480'] = "Mauritius";

        $iso3166['175'] = "Mayotte";

        $iso3166['484'] = "Mexico";

        $iso3166['583'] = "Micronesia (Federated States of)";

        $iso3166['498'] = "Moldova (Republic of)";

        $iso3166['492'] = "Monaco";

        $iso3166['496'] = "Mongolia";

        $iso3166['499'] = "Montenegro";

        $iso3166['500'] = "Montserrat";

        $iso3166['504'] = "Morocco";

        $iso3166['508'] = "Mozambique";

        $iso3166['104'] = "Myanmar";

        $iso3166['516'] = "Namibia";

        $iso3166['520'] = "Nauru";

        $iso3166['524'] = "Nepal";

        $iso3166['528'] = "Netherlands";

        $iso3166['540'] = "New Caledonia";

        $iso3166['554'] = "New Zealand";

        $iso3166['558'] = "Nicaragua";

        $iso3166['562'] = "Niger";

        $iso3166['566'] = "Nigeria";

        $iso3166['570'] = "Niue";

        $iso3166['574'] = "Norfolk Island";

        $iso3166['580'] = "Northern Mariana Islands";

        $iso3166['578'] = "Norway";

        $iso3166['512'] = "Oman";

        $iso3166['586'] = "Pakistan";

        $iso3166['585'] = "Palau";

        $iso3166['275'] = "Palestine, State of";

        $iso3166['591'] = "Panama";

        $iso3166['598'] = "Papua New Guinea";

        $iso3166['600'] = "Paraguay";

        $iso3166['604'] = "Peru";

        $iso3166['608'] = "Philippines";

        $iso3166['612'] = "Pitcairn";

        $iso3166['616'] = "Poland";

        $iso3166['620'] = "Portugal";

        $iso3166['630'] = "Puerto Rico";

        $iso3166['634'] = "Qatar";

        $iso3166['638'] = "Réunion";

        $iso3166['642'] = "Romania";

        $iso3166['643'] = "Russian Federation";

        $iso3166['646'] = "Rwanda";

        $iso3166['652'] = "Saint Barthélemy";

        $iso3166['654'] = "Saint Helena, Ascension and Tristan da Cunha";

        $iso3166['659'] = "Saint Kitts and Nevis";

        $iso3166['662'] = "Saint Lucia";

        $iso3166['663'] = "Saint Martin (French part)";

        $iso3166['666'] = "Saint Pierre and Miquelon";

        $iso3166['670'] = "Saint Vincent and the Grenadines";

        $iso3166['882'] = "Samoa";

        $iso3166['674'] = "San Marino";

        $iso3166['678'] = "Sao Tome and Principe";

        $iso3166['682'] = "Saudi Arabia";

        $iso3166['686'] = "Senegal";

        $iso3166['688'] = "Serbia";

        $iso3166['690'] = "Seychelles";

        $iso3166['694'] = "Sierra Leone";

        $iso3166['702'] = "Singapore";

        $iso3166['534'] = "Sint Maarten (Dutch part)";

        $iso3166['703'] = "Slovakia";

        $iso3166['705'] = "Slovenia";

        $iso3166['090'] = "Solomon Islands";

        $iso3166['706'] = "Somalia";

        $iso3166['710'] = "South Africa";

        $iso3166['239'] = "South Georgia and the South Sandwich Islands";

        $iso3166['728'] = "South Sudan";

        $iso3166['724'] = "Spain";

        $iso3166['144'] = "Sri Lanka";

        $iso3166['729'] = "Sudan";

        $iso3166['740'] = "Suriname";

        $iso3166['744'] = "Svalbard and Jan Mayen";

        $iso3166['752'] = "Sweden";

        $iso3166['756'] = "Switzerland";

        $iso3166['760'] = "Syrian Arab Republic";

        $iso3166['158'] = "Taiwan (Province of China)";

        $iso3166['762'] = "Tajikistan";

        $iso3166['834'] = "Tanzania, United Republic of";

        $iso3166['764'] = "Thailand";

        $iso3166['626'] = "Timor-Leste";

        $iso3166['768'] = "Togo";

        $iso3166['772'] = "Tokelau";

        $iso3166['776'] = "Tonga";

        $iso3166['780'] = "Trinidad and Tobago";

        $iso3166['788'] = "Tunisia";

        $iso3166['792'] = "Turkey";

        $iso3166['795'] = "Turkmenistan";

        $iso3166['796'] = "Turks and Caicos Islands";

        $iso3166['798'] = "Tuvalu";

        $iso3166['800'] = "Uganda";

        $iso3166['804'] = "Ukraine";

        $iso3166['784'] = "United Arab Emirates";

        $iso3166['826'] = "United Kingdom of Great Britain and Northern Ireland";

        $iso3166['840'] = "United States of America";

        $iso3166['581'] = "United States Minor Outlying Islands";

        $iso3166['858'] = "Uruguay";

        $iso3166['860'] = "Uzbekistan";

        $iso3166['548'] = "Vanuatu";

        $iso3166['862'] = "Venezuela (Bolivarian Republic of)";

        $iso3166['704'] = "Viet Nam";

        $iso3166['092'] = "Virgin Islands (British)";

        $iso3166['850'] = "Virgin Islands (U.S.)";

        $iso3166['876'] = "Wallis and Futuna";

        $iso3166['732'] = "Western Sahara";

        $iso3166['887'] = "Yemen";

        $iso3166['894'] = "Zambia";

        $iso3166['716'] = "Zimbabwe";

        // ISO/IEC 7816-5 AID decoder

        $out = array();

        // A very good source about the coding

        // https://blog.actorsfit.com/a?ID=00250-166ef507-edff-4400-8d0e-9e85d6ae2310

        $aid = strtoupper($aid);

        $aid = trim($aid);

        $aid = str_replace(' ','',$aid);

        if ($aid == '') {

                $out[] = "INVALID: The AID is empty";

                return $out;

        }

        if (!preg_match('@^[0-9A-F]+$@', $aid, $m)) {

                $out[] = "INVALID: AID has invalid characters. Only A..F and 0..9 are allowed";

                return $out;

        }

        $aid_hf = '';

        for ($i=0; $i<strlen($aid); $i++) {

                $aid_hf .= $aid[$i];

                if ($i%2 == 1) $aid_hf .= ' ';

        }

        if (strlen($aid)%2 == 1) $aid_hf .= '_';

        $aid_hf = rtrim($aid_hf);

        $out[] = array("$aid", "ISO/IEC 7816-5 Application Identifier (AID)");

        $out[] = array('', "> $aid_hf <");

        $out[] = array('', c_literal_hexstr($aid));

        if ((strlen($aid) == 32) && (substr($aid,-2) == 'FF')) {

                // https://www.kartenbezogene-identifier.de/content/dam/kartenbezogene_identifier/de/PDFs/RID_Antrag_2006.pdf

                // writes: "Wenn die PIX aus 11 Bytes besteht, muss das letzte Byte einen Hexadezimal-Wert ungleich ´FF´ aufweisen (´FF´ ist von ISO reserviert)."

                // https://www.etsi.org/deliver/etsi_ts/101200_101299/101220/07.03.00_60/ts_101220v070300p.pdf

                // writes: According to ISO/IEC 7816-4, if the AID is 16 bytes long, then the value 'FF' for the least significant byte [...] is reserved for future use.

                $out[] = array('',"INVALID: A 16-byte AID must not end with FF. (Reserved by ISO/IEC 7816-4)");

        }

        if (strlen($aid) > 32) {

                $out[] = array('',"INVALID: An AID must not be longer than 16 bytes");

        }

        $category = substr($aid,0,1);

        // Category 0..9

        // RID = ISO/IEC 7812 Issuer Identification Number (IIN 6 or 8 digits)

        // AID = RID + 'FF' + PIX

        $iso7812_category = array();

        $iso7812_category['0'] = 'ISO/TC 68 and other industry assignments';

        $iso7812_category['1'] = 'Airlines';

        $iso7812_category['2'] = 'Airlines, financial and other future industry assignments';

        $iso7812_category['3'] = 'Travel and entertainment';

        $iso7812_category['4'] = 'Banking and financial';

        $iso7812_category['5'] = 'Banking and financial';

        $iso7812_category['6'] = 'Merchandising and banking/financial';

        $iso7812_category['7'] = 'Petroleum and other future industry assignments';

        $iso7812_category['8'] = 'Healthcare, telecommunications and other future industry assignments';

        $iso7812_category['9'] = 'Assignment by national standards bodies';

        foreach ($iso7812_category as $check_cat => $check_cat_name) {

                if ("$category" == "$check_cat") { // comparison as string is important so that "===" works. "==" does not work because 0=='A' for some reason!

                        #$out[] = array($category, "AID based on category $category of ISO/IEC 7812 Issuer Identification Number (IIN)");

                        #$out[] = array('',        "($check_cat = $check_cat_name)");

                        $out[] = array('', "AID based on ISO/IEC 7812 Issuer Identification Number (IIN)");

                        $iin = $aid;

                        // IIN and PIX must be delimited with FF, but only if a PIX is available.

                        // When the IIN has an odd number, then an extra 'F' must be added at the end

                        $pos = strpos($aid,'F');

                        if ($pos !== false) $iin = substr($iin, 0, $pos);

                        if (!_is_bcd($iin)) {

                                $out[] = array($iin, "INVALID: Expected BCD encoded IIN, optionally followed by FF and PIX");

                                return $out;

                        }

                        $pad = '';

                        $out[] = 'RID-HERE'; // will (must) be replaced below

                        $out[] = array($iin, "ISO/IEC 7812 Issuer Identification Number (IIN)");

                        if ((strlen($iin) != 6) && (strlen($iin) != 8)) {

                                $out[] = array('',"Warning: IIN has an unusual length. 6 or 8 digits are expected!");

                        }

                        $out[] = array($category, "IIN Category $category = $check_cat_name");

                        $pad .= str_repeat(' ', strlen("$category"));

                        if ("$category" === "9") {

                                $country = substr($iin,1,3);

                                if ($country == '') {

                                        $out[] = array($pad.'___', 'ISO/IEC 3166-1 Numeric Country code (missing)');

                                } else {

                                        $country_name = isset($iso3166[$country]) ? $iso3166[$country] : 'Unknown country';

                                        $out[] = array($pad.str_pad($country,3,'_',STR_PAD_RIGHT), "ISO/IEC 3166-1 Numeric Country code : $country ($country_name)");

                                }

                                $pad .= '   ';

                                $asi = substr($iin,4);

                                $asn = $asi;

                        } else {

                                $asi = substr($iin,1);

                                $asn = $asi;

                        }

                        $out[] = array("$pad$asn", 'Assigned number'.($asi=='' ? ' (missing)' : ''));

                        if ($asi!='') $out[] = array('', c_literal_hexstr($asi));

                        $pad .= str_repeat(' ',strlen($asn));

                        $padded_iin = $iin;

                        if (strlen($iin)%2 != 0) {

                                $odd_padding = substr($aid,strlen($iin),1);

                                if ($odd_padding != 'F') {

                                        foreach ($out as $n => &$tmp) {

                                                if ($tmp == 'RID-HERE') {

                                                        unset($out[$n]);

                                                        break;

                                                }

                                        }

                                        $out[] = array("$pad!","INVALID: An IIN with odd length must be padded with F, e.g. 123 => 123F");

                                        return $out;

                                }

                                $out[] = array($pad.$odd_padding, 'Padding of IIN with odd length');

                                $padded_iin .= $odd_padding;

                                $pad .= ' ';

                        }

                        $rid = $padded_iin;

                        foreach ($out as &$tmp) {

                                if ($tmp == 'RID-HERE') {

                                        $tmp = array("$rid", "Registered Application Provider Identifier (RID)");

                                        break;

                                }

                        }

                        if (strlen($aid) == strlen($padded_iin)) {

                                // There is no PIX

                                $out[] = "Proprietary application identifier extension (PIX) missing";

                        } else {

                                $delimiter = substr($aid,strlen($padded_iin),2);

                                if ($delimiter != 'FF') {

                                        $out[] = array($pad.substr($aid,strlen($padded_iin)), "INVALID: RID/IIN and PIX must be delimited by FF");

                                        return $out;

                                }

                                $out[] = array($pad.$delimiter, 'Delimiter which separates RID/IIN from PIX');

                                $pad .= str_repeat(' ',strlen($delimiter));

                                $pix = substr($aid,strlen($padded_iin)+strlen('FF'));

                                if ($pix == '') {

                                        $out[] = "Proprietary application identifier extension (PIX) missing";

                                        $out[] = "Warning: If PIX is available, FF delimites RID/IIN from PIX. Since PIX is empty, consider removing FF."; // not sure if this is an error or not

                                } else {

                                        $out[] = array($pad.$pix, "Proprietary application identifier extension (PIX)");

                                        $out[] = array('', c_literal_hexstr($pix));

                                }

                        }

                        return $out;

                }

        }

        // Category 'A' (International Registration)

        // RID = 'A' + 9 digits

        // AID = RID + PIX

        if ("$category" === "A") {

                $rid = substr($aid,0,10);

                $rid = str_pad($rid,10,'_',STR_PAD_RIGHT);

                $pix = substr($aid,10);

                $asi = substr($aid,1,9);

                $asn = str_pad($asi,9,'_',STR_PAD_RIGHT);

                $out[] = array("$rid", "Registered Application Provider Identifier (RID)");

                $out[] = array("$category", "Category $category: International registration");

                $out[] = array(" $asn", 'Assigned number, BCD recommended'.($asi=='' ? ' (missing)' : ''));

                if ($asi!='') $out[] = array('', c_literal_hexstr($asi));

                if ($pix == '') {

                        $out[] = "Proprietary application identifier extension (PIX) missing";

                } else {

                        $out[] = array(str_pad($pix,strlen($aid),' ',STR_PAD_LEFT), "Proprietary application identifier extension (PIX)");

                        $out[] = array('', c_literal_hexstr($pix));

                }

                return $out;

        }

        // Category 'D' (Local/National Registration)

        // RID = 'D' + 3 digits country code (ISO/IEC 3166-1) + 6 digits

        // AID = RID + PIX

        if ("$category" === "D") {

                $rid = substr($aid,0,10);

                $rid = str_pad($rid,10,'_',STR_PAD_RIGHT);

                $pix = substr($aid,10);

                $country = substr($aid,1,3);

                $asi = substr($aid,4,6);

                $asn = str_pad($asi,6,'_',STR_PAD_RIGHT);

                $out[] = array("$rid", "Registered Application Provider Identifier (RID)");

                $out[] = array("$category", "Category $category: Local/National registration");

                if ($country == '') {

                        $out[] = array(" ___", "ISO/IEC 3166-1 Numeric Country code (missing)");

                } else {

                        $country_name = isset($iso3166[$country]) ? $iso3166[$country] : 'Unknown country';

                        $out[] = array(" ".str_pad($country,3,'_',STR_PAD_RIGHT), "ISO/IEC 3166-1 Numeric Country code : $country ($country_name)");

                }

                $out[] = array("    $asn", 'Assigned number, BCD recommended'.($asi=='' ? ' (missing)' : ''));

                if ($asi!='') $out[] = array('', c_literal_hexstr($asi));

                if ($pix == '') {

                        $out[] = "Proprietary application identifier extension (PIX) missing";

                } else {

                        $out[] = array(str_pad($pix,strlen($aid),' ',STR_PAD_LEFT), "Proprietary application identifier extension (PIX)");

                        $out[] = array('', c_literal_hexstr($pix));

                }

                return $out;

        }

        // Category 'F'

        // AID = 'F' + PIX

        if ("$category" === "F") {

                $out[] = array("$category", "Category $category: Non-registered / Proprietary");

                $rid = substr($aid,0,1);

                $pix = substr($aid,1);

                if ($pix == '') {

                        $out[] = "Proprietary application identifier extension (PIX) missing";

                } else {

                        $out[] = array(' '.$pix, "Proprietary application identifier extension (PIX)");

                        $out[] = array('', c_literal_hexstr($pix));

                }

                return $out;

        }

        // Category 'B', 'C', and 'E' are reserved

        $out[] = array("$category", "Category $category: ILLEGAL USAGE / RESERVED");

        if (strlen($aid) > 1) {

                $aid_ = substr($aid,1);

                $out[] = array(" ".$aid_, "Unknown composition");

                $out[] = array('', c_literal_hexstr($aid_));

        }

        return $out;

}

/* --- Small extra function: not part of the decoder --- */

function aid_split_rid_pix($a, &$rid=null, &$pix=null) {

        // "Quick'n'Dirty" function which does not do any consistency checks!