bool checkLocation

(

ItemNode *

node

)

Definition at line 2023 of file feeserver.c.

References calculateChecksum().

Referenced by monitorValues().

                                   {
        if (node->item->location == node->locBackup) {
                // locations are identical, so no bitflip
                return true;
        }
        // locations are not identical, check further

        if (node->checksum == calculateChecksum((unsigned char*)
                        &(node->item->location), sizeof(volatile float*))) {
                // checksum tells, that first location should be valid, repair backup
                node->locBackup = node->item->location;
                return true;
        }
        // original location or first checksum is wrong, continue checking

        if (node->checksum == calculateChecksum((unsigned char*)
                        &(node->locBackup), sizeof(volatile float*))) {
                // checksum tells, that location backup should be valid, repair original
                node->item->location = node->locBackup;
                return true;
        }
        // location backup or first checksum is wrong, continue checking

        if (node->checksum == node->checksumBackup) {
                // it seems that location and location backup are wrong
                // or checksum value runs banana, not repairable
                return false;
        }
        // it seems that first checksum is wrong
        // try to fix with second checksum

        if (node->checksumBackup == calculateChecksum((unsigned char*)
                        &(node->item->location), sizeof(volatile float*))) {
                // checksum backup tells, that first location should be valid, repair backup
                node->locBackup = node->item->location;
                // repair first checksum
                node->checksum = node->checksumBackup;
                return true;
        }
        // original location or second checksum is wrong, continue checking

        if (node->checksumBackup == calculateChecksum((unsigned char*)
                        &(node->locBackup), sizeof(volatile float*))) {
                // checksum backup tells, that location backup should be valid, repair original
                node->item->location = node->locBackup;
                // repair checksum
                node->checksum = node->checksumBackup;
                return true;
        }
        // value is totally banana, no chance to fix
        return false;
}

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