[Qt-interest] How to compress QString

[Iurii Gordiienko]

We can't convert UNICODE string to UTF-8 because data will be loss.    QByteArray compress(const QString& s)    
{    
  return qCompress( QByteArray(reinterpret_cast<const char*>(s.utf16()),s.size()*sizeof(ushort)), 9);    
}    
    
QString uncompress(const QByteArray& ba)    
{    
  QString ret;    
    
  if(!ba.isEmpty()){    
    QByteArray v = qUncompress(ba);    
    if(!v.isEmpty() && !(v.size() % sizeof(ushort)) ){    
      ret.setUtf16( reinterpret_cast<const ushort*>(v.constData()), v.size() / sizeof(ushort) );    
    }    
  }    
    
  return ret;    
}    
    
    
        
    
--- Original Message ---    
From: Jan Kundr?t <jkt at gentoo.org>    
To: qt-interest at trolltech.com    
Date: 16 april, 14:35:00    
Subject: Re: [Qt-interest] How to compress QString    
    
    Ankit Agarwal wrote:    
> Whats the advantage that we get by converting the string to UTF - 8?    
    
No need to figure out magic multiplication constants for figuring out    
the string size. Basically, if you convert a QString to a QByteArray    
holding its UTF-8 representation, you can tell the size of the data from    
QByteArray's size(). Also having a stable and well-documented    
intermediate format (which a byte array of UTF-8 data is) always helps.    
    
Cheers    
-jkt    
    
--    
cd /local/pub && more beer > /dev/mouth    
    
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