private void Load()
{
if (TheStore.TheFile.Length >= BitmapToPos(Ix + 1))
{
TheStore.TheFile.Position = BitmapToPos(Ix);
if (StreamUtils.ReadInt8(TheStore.TheFile) != (byte)Store.SectorTypes.Bitmap)
{
InitializeBitmapSector();
return;
}
var nextix = StreamUtils.ReadInt32(TheStore.TheFile);
SectorData = StreamUtils.Read(TheStore.TheFile, (int)TheStore.SectorDataSize);
if (nextix != Store.LAST_SECTOR_IN_CHAIN)
{
NextBitmap = new BitmapSector(TheStore, nextix, SectorSize);
}
else
{
NextBitmap = null;
}
}
else
{
InitializeBitmapSector();
}
}
internal int ExtendBitmapSpace()
{
var ix = TotalBitCount;
TheStore.TheFile.Position = BitmapToPos(ix);
TheStore.TheFile.WriteByte((byte)Store.SectorTypes.Unallocated);
var next = new BitmapSector(TheStore, ix, SectorSize);
#if STORE_DETAILED_TRACE_LOGS
System.Diagnostics.Debug.WriteLine("ExtendBitmapSpace: " + ix.ToString());
#endif
// Its now reserving space for itself
next[0] = true;
var lastbitmapsector = TheStore.Bits;
while (lastbitmapsector.NextBitmap != null)
{
lastbitmapsector = lastbitmapsector.NextBitmap;
}
lastbitmapsector.NextBitmap = next;
TheStore.TheFile.Position = BitmapToPos(lastbitmapsector.Ix) + 1;
StreamUtils.WriteInt32(TheStore.TheFile, next.Ix);
return(ix);
}
private void InitializeBitmapSector()
{
TheStore.TheFile.Position = BitmapToPos(Ix);
StreamUtils.WriteUInt8(TheStore.TheFile, (byte)Store.SectorTypes.Bitmap);
StreamUtils.WriteInt32(TheStore.TheFile, Store.LAST_SECTOR_IN_CHAIN);
NextBitmap = null;
SectorData = new byte[(int)TheStore.SectorDataSize];
StreamUtils.Write(TheStore.TheFile, SectorData);
}
private void Initialize(Stream dest, int defaultsectorsize)
{
if (defaultsectorsize > 0 && defaultsectorsize < 16)
{
throw new Exception("Minimum chunk size: 16 bytes.");
}
Chunksize = defaultsectorsize <= 0 ? 1024 : defaultsectorsize;
TheFile = dest;
InitializeChunksize();
Bits = new BitmapSector(this, BITMAP_START_SECTOR, Chunksize);
FreeSectorSearchStartIndex = RESERVED_SECTORS;
InitializeReservedSectors();
}
long PosToBitmap(int bit)
{
return(BitmapSector.PosToBitmap(bit, Chunksize));
}
long BitmapToPos(int bit)
{
return(BitmapSector.BitmapToPos(bit, Chunksize));
}
