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Data.cpp

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#include "Data.h"

#include <QTextCodec>

// Note that these aren't all possible BOMs. But they are probably the most common ones.

// The size is needed at least for the ones with character zero in them.

static const QByteArray bom3("\xEF\xBB\xBF", 3);

static const QByteArray bom2a("\xFE\xFF", 2);

static const QByteArray bom2b("\xFF\xFE", 2);

static const QByteArray bom4a("\x00\x00\xFE\xFF", 4);

static const QByteArray bom4b("\xFF\xFE\x00\x00", 4);

bool isTextOnly(QByteArray data, const QString& encoding, bool quickTest)

{

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

if(startsWithBom(data))

return true;

// Truncate to the first couple of bytes for quick testing

if(quickTest)

data = data.left(512);

// Convert to Unicode if necessary

if(!encoding.isEmpty())

data = QTextCodec::codecForName(encoding.toUtf8())->toUnicode(data).toUtf8();

// Perform check

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

}

bool startsWithBom(const QByteArray& data)

{

if(data.startsWith(bom3) ||

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

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

return true;

else

return false;

}

QByteArray removeBom(QByteArray& data)

{

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();

}