/**
Read and validate the boot sector.
If there is an error in reading the main boot sector (sec:0) or it is invalid, tries to read backup boot sector from sec:6.
Flag iMainBootSecValid indicates the validity of the main boot sector. if it is false, but ret. value is KErrNone, it means that
the backup boot sector was used and it is valid.
@param aBootSector reference to the boot sector object to be read.
@param aDoNotReadBkBootSec if true, there won't be an attempt to read backup sector
@return standard error code.
*/
TInt CFatMountCB::ReadBootSector(TFatBootSector& aBootSector, TBool aDoNotReadBkBootSec/*=EFalse*/)
{
iMainBootSecValid = EFalse;
//-- read main boot sector from the sector 0
TInt nRes = DoReadBootSector(KBootSectorNum << KDefSectorSzLog2, aBootSector);
if(nRes == KErrNone)
{
if(aBootSector.IsValid())
{
iMainBootSecValid = ETrue; //-- main boot sector is valid, everything is OK
return KErrNone;
}
else
{
__PRINT(_L("MainBoot Sector is invalid! dump:\n"));
aBootSector.PrintDebugInfo();
nRes = KErrCorrupt;
}
}
ASSERT(nRes!= KErrNone && !iMainBootSecValid);
if(aDoNotReadBkBootSec)
return nRes;
//-- main boot sector is invalid, try backup one (it might not present at all)
__PRINT(_L("Using backup boot sector...\n"));
nRes=DoReadBootSector(KBkBootSectorNum << KDefSectorSzLog2, aBootSector);
if(nRes == KErrNone )
{
if(aBootSector.IsValid())
return KErrNone; //-- main boot sector is bad, but backup one is OK
else
{//-- backup boot sector is invalid
__PRINT(_L("Backup Sector is invalid! dump:\n"));
aBootSector.PrintDebugInfo();
nRes = KErrCorrupt;
}
}
//-- can't read boot sectors, or both are invalid
return nRes;
}
void ReadBootSector(TFatBootSector& aBootSector)
{
TInt r = ReadBootSector(TheFs, CurrentDrive(), KBootSectorNum<<KDefaultSectorLog2, aBootSector);
test_KErrNone(r);
if(!aBootSector.IsValid())
{
test.Printf(_L("Wrong bootsector! Dump:\n"));
aBootSector.PrintDebugInfo();
test(0);
}
}
