integration of uchardet with QTextCodec - codec names dont always match

CMakeLists.txt

cmake_minimum_required(VERSION 3.14)

project(integrate_uchardet LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)

add_executable(integrate_uchardet integrate_uchardet.cpp)
target_link_libraries(integrate_uchardet Qt${QT_VERSION_MAJOR}::Core)

integrate_uchardet.cpp

#include <QDebug>
#include <QCoreApplication>
#include <QList>
#include <QMap>
#include <QTextCodec>

static QMap<QByteArray,QList<QByteArray> > ucodecs{
{"International (Unicode)", {
  "UTF-8",
  "UTF-16BE",
  "UTF-16LE",
  "UTF-32BE",
  "UTF-32LE"}},
{"Arabic", {
  "ISO-8859-6",
  "WINDOWS-1256"}},
{"Bulgarian", {
  "ISO-8859-5",
  "WINDOWS-1251"}},
{"Chinese", {
  "ISO-2022-CN",
  "BIG5",
  /*"EUC-TW",*/
  "GB18030",
  "HZ-GB-2312"}},
{"Croatian", {
  "ISO-8859-2",
  "ISO-8859-13",
  "ISO-8859-16",
  "Windows-1250",
  "IBM852",
  "MAC-CENTRALEUROPE"}},
{"Czech", {
  "Windows-1250",
  "ISO-8859-2",
  "IBM852",
  "MAC-CENTRALEUROPE"}},
{"Danish", {
  "ISO-8859-1",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"English", {
  "ASCII"}},
{"Esperanto", {
  "ISO-8859-3"}},
{"Estonian", {
  "ISO-8859-4",
  "ISO-8859-13",
  "ISO-8859-13",
  "Windows-1252",
  "Windows-1257"}},
{"Finnish", {
  "ISO-8859-1",
  "ISO-8859-4",
  "ISO-8859-9",
  "ISO-8859-13",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"French", {
  "ISO-8859-1",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"German", {
  "ISO-8859-1",
  "WINDOWS-1252"}},
{"Greek", {
  "ISO-8859-7",
  "WINDOWS-1253"}},
{"Hebrew", {
  "ISO-8859-8",
  "WINDOWS-1255"}},
{"Hungarian", {
  "ISO-8859-2",
  "WINDOWS-1250"}},
{"Irish Gaelic", {
  "ISO-8859-1",
  "ISO-8859-9",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"Italian", {
  "ISO-8859-1",
  "ISO-8859-3",
  "ISO-8859-9",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"Japanese", {
  "ISO-2022-JP",
  "SHIFT_JIS",
  "EUC-JP"}},
{"Korean", {
  "ISO-2022-KR",
  "EUC-KR", "UHC"}},
{"Lithuanian", {
  "ISO-8859-4",
  "ISO-8859-10",
  "ISO-8859-13"}},
{"Latvian", {
  "ISO-8859-4",
  "ISO-8859-10",
  "ISO-8859-13"}},
{"Maltese", {
  "ISO-8859-3"}},
{"Polish", {
  "ISO-8859-2",
  "ISO-8859-13",
  "ISO-8859-16",
  "Windows-1250",
  "IBM852",
  "MAC-CENTRALEUROPE"}},
{"Portuguese", {
  "ISO-8859-1",
  "ISO-8859-9",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"Romanian", {
  "ISO-8859-2",
  "ISO-8859-16",
  "Windows-1250",
  "IBM852"}},
{"Russian", {
  "ISO-8859-5",
  "KOI8-R",
  "WINDOWS-1251",
  "MAC-CYRILLIC",
  "IBM866",
  "IBM855"}},
{"Slovak", {
  "Windows-1250",
  "ISO-8859-2",
  "IBM852",
  "MAC-CENTRALEUROPE"}},
{"Slovene", {
  "ISO-8859-2",
  "ISO-8859-16",
  "Windows-1250",
  "IBM852",
  "MAC-CENTRALEUROPE"}},
{"Spanish", {
  "ISO-8859-1",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"Swedish", {
  "ISO-8859-1",
  "ISO-8859-4",
  "ISO-8859-9",
  "ISO-8859-15",
  "WINDOWS-1252"}},
{"Thai", {
  "TIS-620",
  "ISO-8859-11"}},
{"Turkish", {
  "ISO-8859-3",
  "ISO-8859-9"}},
{"Vietnamese", {
  "VISCII",
  "Windows-1258"}}
};

/**
 * References:
 *
 * https://www.iana.org/assignments/character-sets/character-sets.xml
 * https://doc.qt.io/qt-5/qtextcodec.html
 */

QMap<QByteArray,int> umibs{
    /* Linux */
    {"UHC", 38},
    {"ISO-8859-11", 2259},
    {"VISCII", 2082},
    /* Windows */
    {"ISO-2022-CN", 104},
    {"HZ-GB-2312", 2085},
    {"IBM852", 2010},
    {"ASCII", 3},
    {"ISO-2022-KR", 37},
    {"IBM855", 2046}
    /* macOS */
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    auto keys = ucodecs.keys();
    foreach(const auto& k, keys) {
        foreach(const auto& c, ucodecs[k]) {
            auto codec = QTextCodec::codecForName(c);
            if (codec == nullptr) {
                if (!umibs.contains(c)) {
                    qWarning() << k << "\t" << c << ":CHECK!!!";
                }
            } else {
                if (!umibs.contains(c)) {
                    umibs.insert(c, codec->mibEnum());
                } else if (codec->mibEnum() != umibs[c]) {
                    qWarning() << "\t" << c << ":" << codec->mibEnum() << "?" << umibs[c];
                }
            }
        }
    }

    return 0;
}