// It returnes main information about File System
public static FileDataStorage GetData(string filepath)
{
var storage = new FileDataStorage();
using (var fs = System.IO.File.OpenRead(filepath))
{
GetSuperblock(storage.Superblock, fs);
fs.Seek(4096, System.IO.SeekOrigin.Begin); //Change offset to be dynamic
GetBitmap(storage.Bitmap, fs);
fs.Seek(4096 * 2, System.IO.SeekOrigin.Begin); //Change offset to be dynamic
GetBitmap(storage.INodeMap, fs);
fs.Seek(4096 * 3, System.IO.SeekOrigin.Begin); //Change offset to be dynamic
}
return(storage);
}
private bool WriteFile(FileDataStorage storage, INode iNode)
{
using (System.IO.FileStream fs = System.IO.File.OpenRead(Path),
temp = new System.IO.FileStream(fs.Name + ".temp", System.IO.FileMode.Create))
{
if (iNode.Size / 1024 > 8240)
{
throw new Exception("File size is too big");
}
temp.SetLength(63774720);
int nodeNum = DataExtractor.GetINodeNum(storage.INodeMap);
FSPartsWriter.WriteSuperblock(temp, storage.Superblock);
ByteWriter.CopyData(fs, temp, temp.Position,
GetBlockEnd(storage.Superblock.ClusterSize, temp.Position), storage.Superblock.ClusterSize);
var blocks = BlocksHandler.GetBlocksArr(storage.Bitmap, iNode.Size, storage.Superblock.ClusterSize);
for (int i = 0; i < blocks.Length; ++i)
{
storage.Bitmap.BitmapValue = BitWorker.TurnBitOn(storage.Bitmap.BitmapValue, blocks[i]);
}
FSPartsWriter.WriteBitmap(temp, storage.Bitmap);
ByteWriter.CopyData(fs, temp, temp.Position, GetBlockEnd((Superblock.UsedBlock +
Bitmap.UsedBlock) * storage.Superblock.ClusterSize, temp.Position), storage.Superblock.ClusterSize);
storage.INodeMap.BitmapValue = BitWorker.TurnBitOn(storage.INodeMap.BitmapValue, nodeNum);
FSPartsWriter.WriteBitmap(temp, storage.INodeMap);
ByteWriter.CopyData(fs, temp, temp.Position, GetBlockEnd((Superblock.UsedBlock +
Bitmap.UsedBlock + Bitmap.UsedBlock) * storage.Superblock.ClusterSize,
temp.Position), storage.Superblock.ClusterSize);
var dataDict = BlocksHandler.GetDataArr(blocks, storage.Superblock.ClusterSize);
List <int> dataKeys = new List <int>(dataDict.Keys);
for (int index = 0; index < iNode.Di_addr.Length && index < dataDict.Count; ++index)
{
iNode.Di_addr[index] = (short)dataKeys[index]; //To change short for int cause data can be lost
}
long bytesNum = (nodeNum - 1) * INode.Offset; //How many bytes method need to skip
ByteWriter.CopyBytes(fs, temp, temp.Position, bytesNum, storage.Superblock.ClusterSize);
FSPartsWriter.WriteINode(temp, iNode);
ByteWriter.CopyData(fs, temp, temp.Position, (Superblock.UsedBlock + Bitmap.UsedBlock +
Bitmap.UsedBlock + storage.NodeBlocksOffset) *
storage.Superblock.ClusterSize - 1, storage.Superblock.ClusterSize);
for (int i = 0; i < storage.Bitmap.BitmapValue.Length * 8; ++i)
{
if (dataKeys.Contains(i))
{
ByteWriter.WriteBlock(temp, storage.Superblock.ClusterSize, dataDict[i]);
}
else
{
ByteWriter.CopyBytes(fs, temp, temp.Position,
storage.Superblock.ClusterSize, storage.Superblock.ClusterSize);
}
}
return(true);
}
}
