/// <summary>
/// Save storage to file
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public void Dump(string path, string name, bool encrypt = false)
{
string d_path = path;
if (d_path != "")
{
if (!System.IO.Directory.Exists(d_path))
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "Dump, path is not found: '" + d_path + "'");
}
}
else
{
d_path = System.IO.Directory.GetCurrentDirectory();
}
string fname = GenerateDumpFileName(d_path);
if (File.Exists(fname))
{
File.Delete(fname);
}
VSIO IO = new VSIO(fname, VSIO.FILE_MODE_CREATE, DEFS.ENCRYPT_DUMP);
IO.SetEncryption(encrypt);
dump(IO, name);
IO.Close();
}
/// <summary>
/// Close file and set to null (private)
/// </summary>
private void CloseTAFile()
{
if (IO != null)
{
IO.Close();
IO = null;
}
}
/// <summary>
/// Add partition to space: name - space name; size - size(Mb)
/// </summary>
/// <param name="name"></param>
/// <param name="size">Mb</param>
/// <returns></returns>
public void AddPartition(string name, int size)
{
if (state != DEFS.STATE_DEFINED)
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'AddPartition' (storage is opened or undefined)");
}
VSCatalogDescriptor desc = CATALOG.Get(name);
if (desc == null)
{
throw new VSException(DEFS.E0002_SPACE_NOT_FOUND_CODE, "(" + name + ")");
}
if (!this.Lock())
{
throw new VSException(DEFS.E0001_UNABLE_TO_LOCK_CODE, "(Add partition)");
}
long old_size = desc.SpaceSize;
//Calculate space size (in pages)
long add_pages = (long)(((size < 1) ? 1 : size) * 1048576) / desc.PageSize;
desc.space_size_pg += add_pages;
if (!IMO)
{
// Append pages
byte[] dataArray = new byte[desc.PageSize];
VSIO IO = new VSIO(GetSpaceFileName(name, desc.Path, (int)desc.Partitions), VSIO.FILE_MODE_CREATE, "");
byte[] resv = new byte[8];
for (long i = 0; i < add_pages; i++)
{
IO.Write(-1, DEFS.DATA_NOT_ENCRYPTED); // + 0 (4) Encryption indicator
IO.Write(-1, (uint)0); // + 4 (4) CRC32 placeholder
IO.Write(-1, ref resv); // +8 (8) reserve
IO.Write(-1, ref dataArray);
}
IO.Close();
desc.partitions++;
AddNewAllocation(desc.Path, name, old_size, add_pages * desc.PageSize);
CATALOG.Save();
}
Release();
}
/// <summary>
/// Restore storage from byte array
/// </summary>
public void RestoreFromArray(byte[] array, string name = "*")
{
if (state != DEFS.STATE_DEFINED)
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'Restore' - storage is opened or undefined");
}
VSIO IO = new VSIO(array, DEFS.ENCRYPT_DUMP);
this.restore(IO, name);
IO.Close();
}
/// <summary>
/// Restore storage from file
/// </summary>
public void Restore(string filename = "", string name = "*")
{
if (state != DEFS.STATE_DEFINED)
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'Restore' - storage is opened or undefined");
}
if (!System.IO.File.Exists(filename))
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'Restore' - file is not found: '" + filename + "'");
}
VSIO IO = new VSIO(filename, VSIO.FILE_MODE_OPEN, DEFS.ENCRYPT_DUMP);
this.restore(IO, name);
IO.Close();
}
/*************************************************************************************/
/************************* PRIVATE METHODS ******************************************/
/*************************************************************************************/
/// <summary>
/// Update FSAT by adding new element (Extend, AddPartition) or in Create
/// </summary>
/// <param name="name"></param>
/// <param name="address"></param>
/// <param name="length"></param>
/// <returns></returns>
private void AddNewAllocation(string space_path, string name, long address, long length)
{
VSIO IO = new VSIO(GetSpaceFileName(name, space_path), VSIO.FILE_MODE_OPEN, "");
long h_addr = DEFS.SYSTEM_ALLOCATION_ADDRESS;
short n = IO.ReadShort(h_addr); //The number of pending updates
long e_addr = h_addr + 2 + (n * 16);
IO.Write(e_addr, address);
IO.Write(e_addr + 8, address + length);
n++;
IO.Write(h_addr, n);
IO.Close();
}
/// <summary>
/// Extend space size: name - space name; size - extension(Mb)
/// </summary>
/// <param name="name"></param>
/// <param name="size (Mb)"></param>
/// <returns></returns>
public void Extend(string name, int size)
{
if (state != DEFS.STATE_DEFINED)
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'Extend' (storage is opened or undefined)");
}
VSCatalogDescriptor desc = CATALOG.Get(name);
if (desc == null)
{
throw new VSException(DEFS.E0002_SPACE_NOT_FOUND_CODE, "(" + name + ")");
}
if (!IMO)
{
if (desc.Partitions > 1) // Check if more than 1 partition exists. If so - add partition instead of extending
{
this.AddPartition(name, size);
return;
}
}
if (!this.Lock())
{
throw new VSException(DEFS.E0001_UNABLE_TO_LOCK_CODE, "(Extend space)");
}
long start_pos = desc.SpaceSize; //Address of the 1st byte out of space
//Calculate new allocation size in pages
long add_pages = (long)(((size < 1) ? 1 : size) * 1048576) / (long)(desc.PageSize);
// Increase space size in descriptor
desc.space_size_pg += add_pages;
if (!IMO)
{
//Initialize page buffer
byte[] dataArray = new byte[desc.PageSize];
//Append pages
VSIO IO = new VSIO(GetSpaceFileName(name, desc.Path), VSIO.FILE_MODE_APPEND, "");
byte[] resv = new byte[8];
for (long i = 0; i < add_pages; i++)
{
IO.Write(-1, DEFS.DATA_NOT_ENCRYPTED); // + 0 (4) Encryption indicator
IO.Write(-1, (uint)0); // + 4 (4) CRC32 placeholder
IO.Write(-1, ref resv); // +8 (8) reserve
IO.Write(-1, ref dataArray);
}
IO.Close();
AddNewAllocation(desc.Path, name, start_pos, add_pages * desc.PageSize);
CATALOG.Save();
}
Release();
}
//==========================================================================================================//
//=========================================== Manager ======================================================//
//==========================================================================================================//
/// <summary>
/// Create new address space. Return 0 - successful; -1 - error
/// dir - directory
/// name - space name
/// page size - in Kb
/// size - size of the space in Mb. Default - 5
/// extension - size for dynamic extension in MB. Default - 5
/// </summary>
/// <param name="name"></param>
/// <param name="pagesize"></param>
/// <param name="size"></param>
/// <returns></returns>
public void Create(string name, int pagesize = DEFS.DEFAULT_PAGE_SIZE, int size = DEFS.DEFAULT_SPACE_SIZE, int extension = DEFS.DEFAULT_EXT_SIZE, string path = "")
{
if (state != DEFS.STATE_DEFINED)
{
throw new VSException(DEFS.E0025_STORAGE_UNABLE_TO_COMPLETE_CODE, "- 'Create' (storage is opened or undefined)");
}
VSCatalogDescriptor desc = CATALOG.Get(name);
if (desc != null)
{
throw new VSException(DEFS.E0024_CREATE_SPACE_ERROR_CODE, "- space already exists(" + name + ")");
}
string space_path = path.Trim();
string sname = "";
if (IMO)
{
space_path = "";
}
else
{
if (space_path == "")
{
space_path = root_path;
}
if (!System.IO.Directory.Exists(space_path))
{
throw new VSException(DEFS.E0004_STORAGE_NOT_FOUND_CODE, "(" + space_path + ")");
}
// Check if directory exists
if (!System.IO.Directory.Exists(root_path))
{
throw new VSException(DEFS.E0004_STORAGE_NOT_FOUND_CODE, "(" + root_path + ")");
}
if (!this.Lock())
{
throw new VSException(DEFS.E0001_UNABLE_TO_LOCK_CODE, "(Create space)");
}
// Check if file exists, if no - create new space.
sname = GetSpaceFileName(name, space_path);
if (System.IO.File.Exists(sname))
{
throw new VSException(DEFS.E0005_FILE_ALREADY_EXISTS_CODE, "(" + sname + ")");
}
}
// Add descriptor
desc = CATALOG.Create(name, (long)size, (long)extension, (long)pagesize, space_path);
desc.IMO = IMO;
if (!desc.IMO)
{
//Create file
byte[] dataArray = new byte[desc.PageSize];
VSIO IO = new VSIO(sname, VSIO.FILE_MODE_CREATE, "");
byte[] resv = new byte[8];
for (long i = 0; i < desc.space_size_pg; i++)
{
IO.Write(-1, DEFS.DATA_NOT_ENCRYPTED); // + 0 (4) Encryption indicator
IO.Write(-1, (uint)0); // + 4 (4) CRC32 placeholder
IO.Write(-1, ref resv); // +8 (8) reserve
IO.Write(-1, ref dataArray);
}
IO.Write(DEFS.SYSTEM_OWNER_ADDRESS + 16, DEFS.SYSTEM_OWNER_UNDEFINED.PadRight((int)DEFS.SYSTEM_OWNER_LENGTH));
IO.Close();
CATALOG.Save();
}
Release();
}
