private void ReadHeadData(int x, int z)
{
int startPosition = (x * REGION_DEPTH + z) * 4;
_fs.Position = startPosition;
byte[] blockOffsetByte = new byte[4];
_fs.Read(blockOffsetByte, 0, blockOffsetByte.Length - 1);
int blockOffset = Serialization.ReadIntFromByteArr(blockOffsetByte);
//如果块的偏移量小于两个扇区大小，那么当前块没有创建
if (blockOffset < 2)
{
return;
}
byte blockLength = (byte)_fs.ReadByte();
if (blockLength == 0)
{
_headData[x, z].status = ChunkDataStatus.Length_Error;
return;
}
// //读入时间戳
// _fs.Position = startPosition + SectorToByte(2);
// byte[] timestampByte = new byte[4];
// _fs.Read(timestampByte,0,timestampByte.Length);
_fs.Position = SectorToByte(blockOffset);
byte[] chunkSizeByte = new byte[4];
_fs.Read(chunkSizeByte, 0, chunkSizeByte.Length);
int chunkSize = Serialization.ReadIntFromByteArr(chunkSizeByte);
MTBCompressType compressFormat = (MTBCompressType)_fs.ReadByte();
_headData[x, z].BlockOffset = blockOffset;
_headData[x, z].BlockLength = blockLength;
_headData[x, z].Length = chunkSize;
_headData[x, z].CompressionType = compressFormat;
_headData[x, z].status = ChunkDataStatus.OK;
for (int i = blockOffset; i < blockOffset + blockLength; i++)
{
_useSector[i] = true;
}
}
