/*!
Returns an envelope object corresponding to the data in \a pdu.
The data is decoded as described in 3GPP TS 11.14.
\sa toPdu()
*/
QSimEnvelope QSimEnvelope::fromPdu( const QByteArray& pdu )
{
QSimEnvelope env;
QByteArray content;
uint posn = 0;
uint newPosn;
uint tag, length;
readBer( pdu, posn, tag, length );
if ( ( tag & 0xF0 ) != 0xD0 ) {
// Doesn't appear to be a valid ENVELOPE.
return env;
}
env.setType( (QSimEnvelope::Type)tag );
content = pdu.mid( posn, length );
posn = 0;
readBer( content, posn, tag, length );
for (;;) {
if ( ( posn + length ) > (uint)content.size() )
break;
newPosn = posn + length;
switch ( tag & 0x7F ) {
case 0x02:
{
// Device identities, GSM 11.14, section 12.7.
if ( length >= 2 ) {
env.setSourceDevice
( (QSimCommand::Device)( content[posn] & 0xFF ) );
env.setDestinationDevice
( (QSimCommand::Device)( content[posn + 1] & 0xFF ) );
}
}
break;
case 0x10:
{
// Menu item identifier, GSM 11.14, section 12.10.
if ( length > 0 )
env.setMenuItem( (uint)(content[posn] & 0xFF) );
}
break;
case 0x15:
{
// Help requested, GSM 11.14, section 12.21.
env.setRequestHelp( true );
}
break;
case 0x19:
{
// Event list, GSM 11.14, section 12.25.
if ( length > 0 )
env.setEvent( (QSimEnvelope::Event)( content[posn] & 0xFF ) );
}
break;
default:
{
// Don't know what this is, so add it as an extension field.
env.addExtensionField( tag, content.mid( posn, length ) );
}
break;
}
posn = newPosn;
if ( posn >= (uint)content.size() )
break;
readBer( content, posn, tag, length );
}
return env;
}
