{

// If the data starts with a Unicode BOM, we always assume it is text

if(startsWithBom(data))

return true;

// Truncate to the first few bytes for quick testing

int testSize = quickTest? std::min(512, data.size()) : data.size();

// If the quick test has been requested and we have to truncate the string, we have to use

// an approach where truncated multibyte characters are not interpreted as invalid characters.

if(quickTest && data.size() > testSize) {

// We can assume that the default encoding (UTF-8) and all the ISO-8859

// cannot contain character zero.

// This has to be checked explicitly because toUnicode() is using zero as

// a terminator for these encodings.

if((encoding.isEmpty() || encoding.startsWith("ISO-8859")) && data.contains('\0'))

return false;

QTextCodec::ConverterState state;

QTextCodec *codec = encoding.isEmpty()? QTextCodec::codecForName("UTF-8") : QTextCodec::codecForName(encoding.toUtf8());

const QString text = codec->toUnicode(data.constData(), testSize, &state);

return state.invalidChars == 0;

} else {

// Convert to Unicode if necessary

data = decodeString(data, encoding);

// Perform check

return QString(data).toUtf8() == data;

}

{

if(data.startsWith(bom3) ||

data.startsWith(bom2a) || data.startsWith(bom2b) ||

data.startsWith(bom4a) || data.startsWith(bom4b))

return true;

else

return false;

{

if(data.startsWith(bom3))

{

QByteArray bom = data.left(3);

data.remove(0, 3);

return bom;

} else if(data.startsWith(bom2a) || data.startsWith(bom2b)) {

QByteArray bom = data.left(2);

data.remove(0, 2);

return bom;

} else if(data.startsWith(bom4a) || data.startsWith(bom4b)) {

QByteArray bom = data.left(4);

data.remove(0, 4);

return bom;

} else {

return QByteArray();

}

QStringList strings;

for (const QByteArray &item : list) {

strings.append(QString::fromUtf8(item));

}

return strings;

{

if(encoding.isEmpty())

return str;

else

return QTextCodec::codecForName(encoding.toUtf8())->fromUnicode(str);

{

if(encoding.isEmpty())

return str;

else

return QTextCodec::codecForName(encoding.toUtf8())->toUnicode(str).toUtf8();