@Override
public void close() throws IOException {
// Write back the mapping file if it has been changed
if (sectorMappingDirty) {
writeMappingFile();
}
sectorDevice.close();
}
@Override
public void readSector(int sectorNumber, byte[] buffer, int offset) throws IOException {
int mappedSectorNumber = mapSector(sectorNumber);
if (mappedSectorNumber >= 0) {
sectorDevice.readSector(mappedSectorNumber, buffer, offset);
} else {
Arrays.fill(buffer, offset, offset + sectorLength, (byte) 0);
}
}
@Override
public void writeSector(int sectorNumber, byte[] buffer, int offset) throws IOException {
int freeSectorNumber = getFreeSectorNumber();
if (freeSectorNumber < 0) {
throw new IOException(String.format("Sector Device '%s' is full", mappingFile));
}
sectorDevice.writeSector(freeSectorNumber, buffer, offset);
setSectorMapping(freeSectorNumber, sectorNumber);
}
