private MGRB LoadBitmap(long offset)
{
MGRB bc = new MGRB();
if (offset == -1)
{
return(bc);
}
FileStream bmp = _bitmapFileRead;
bmp.Seek(offset, SeekOrigin.Begin);
var hdr = new byte[_hdrlen];
bmp.Read(hdr, 0, hdr.Length);
if (hdr[0] == (byte)'b' && hdr[1] == (byte)'m')
{
int c = Helper.ToInt32(hdr, 3);
var b = new byte[c];
bmp.Read(b, 0, c);
if (hdr[2] == 1)
{
b = MiniLZO.Decompress(b);
}
bc.Deserialize(fastBinaryJSON.BJSON.ToObject <MGRBData>(b));
}
else
{
log.Error("bitmap not recognized");
}
return(bc);
}
private void ReadFile()
{
byte[] b = File.ReadAllBytes(_path + _filename);
var o = fastBinaryJSON.BJSON.ToObject <MGRBData>(b);
_bits = new MGRB();
_bits.Deserialize(o);
}
private void InitializeFreeList()
{
if (_lastBlockNumber < 0)
{
// write master block
_datawrite.Write(new byte[_BLOCKSIZE], 0, _BLOCKSIZE);
_lastBlockNumber = 1;
//_masterblock.Add("freelist", -1);
}
else
{
_freeList = new MGRB();
// read master block data
var b = ReadBlock(0);
if (b[0] == (byte)'F' && b[1] == (byte)'L')
{
// get free block num and size
int block = Helper.ToInt32(b, 2);
int len = Helper.ToInt32(b, 2 + 4);
int freeblock = block;
b = new byte[len];
var offset = 0;
bool failed = false;
// read blocks upto size from block num
SeekBlock(block);
while (len > 0)
{
// check header
var bb = ReadBlock(block++);
if (bb[0] != (byte)'F' || bb[1] != (byte)'L')
{
// throw exception??
_log.Error("Free list header does not match : " + _filename);
failed = true;
break;
}
int c = len > _BLOCKSIZE ? _BLOCKSIZE - 2 : len;
Buffer.BlockCopy(bb, 2, b, offset, c);
len -= c;
offset += c;
}
if (failed == false)
{
// read freelist from master block from end of file
var o = fastBinaryJSON.BJSON.ToObject <MGRBData>(b);
_freeList.Deserialize(o);
// truncate end of file freelist blocks if lastblock < file size
if (_datawrite.Length > _lastBlockNumber * _BLOCKSIZE)
{
_datawrite.SetLength(_lastBlockNumber * _BLOCKSIZE);
}
}
_lastBlockNumber = freeblock;
}
}
}
public MGRB Copy()
{
if (_containers.Count() > 0)
{
var o = Serialize();
var m = new MGRB();
m.Deserialize(o);
return(m);
}
return(new MGRB());
}
