void SequentialFile::erase( offset_t offset )
{
ASSERT_TRUE(isWritable());
Record* target = offset2record( offset );
ASSERT_TRUE(target->isValid());
offset_t end_offset = offset + target->GetRecordSize();
char* target_end = (char*)target->getEndOfRecord();
for (char* wiper = (char*)target; wiper < target_end; wiper++) {
*wiper = 0;
}
// fix next_write_offset if it is the last record
if (end_offset == next_write_offset) {
iterator i = at(end_offset);
i.GetPrevious();
if (!i.IsValid()) {
next_write_offset = 8;
} else {
next_write_offset = record2offset((Record*)i.GetRecord()->getEndOfRecord());
}
}
}
void SequentialFile::moveRecord( offset_t at, offset_t to )
{
Record* source = offset2record( at );
unsigned int size = source->GetRecordSize();
void* dest = offset2record( to );
memmove( dest, source, size );
if( to > at ) // move right, overlap or no overlap
memset( source, 0, (size_t)(to - at) );
else if( to + size < at ) // move left, no overlap
memset( source, 0, size );
else // move left, overlap
memset( offset2record( to + size ), 0, (size_t)(at - to) );
}