/// <summary>
/// Initialize new datafile with header page + lock reserved area zone
/// </summary>
public static void CreateDatabase(Stream stream, string password = null)
{
// create a new header page in bytes (keep second page empty)
var header = new HeaderPage()
{
LastPageID = 1
};
if (password != null)
{
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// point to begin file
stream.Seek(0, SeekOrigin.Begin);
// get header page in bytes
var buffer = header.WritePage();
stream.Write(buffer, 0, BasePage.PAGE_SIZE);
// write second page empty just to use as lock control
stream.Write(new byte[BasePage.PAGE_SIZE], 0, BasePage.PAGE_SIZE);
}
/// <summary>
/// Create new database - empty header with password
/// </summary>
public override void CreateNew()
{
var header = new HeaderPage();
header.DbParams.Password = _password;
this.WritePage(0, header.WritePage());
}
/// <summary>
/// Read page bytes from disk
/// </summary>
public virtual byte[] ReadPage(uint pageID)
{
// if stream are not initialized but need header, create new header
if (_stream == null && pageID == 0)
{
var header = new HeaderPage
{
LastPageID = 1
};
return(header.WritePage());
}
else if (_stream == null)
{
this.InternalInitialize();
}
var buffer = new byte[BasePage.PAGE_SIZE];
var position = BasePage.GetSizeOfPages(pageID);
// position cursor
if (_stream.Position != position)
{
_stream.Seek(position, SeekOrigin.Begin);
}
// read bytes from data file
_stream.Read(buffer, 0, BasePage.PAGE_SIZE);
return(buffer);
}
public void Initialize(Logger log, string password)
{
// get log instance to disk
_log = log;
// if stream are empty, create header page and save to stream
if (_stream.Length == 0)
{
_log.Write(Logger.DISK, "initialize new datafile");
// create a new header page in bytes
var header = new HeaderPage();
if (password != null)
{
_log.Write(Logger.DISK, "datafile encrypted");
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// write bytes on page
this.WritePage(0, header.WritePage());
}
}
public static void Dump(this HeaderPage page, StringBuilder sb)
{
sb.AppendFormat("Change: {0}, FreeEmptyPageID: {1}, LastPageID: {2}",
page.ChangeID,
page.FreeEmptyPageID.Dump(),
page.LastPageID.Dump());
}
public void Initialize(Logger log, string password)
{
// get log instance to disk
_log = log;
// if stream are empty, create header page and save to stream
if (_stream.Length == 0)
{
_log.Write(Logger.DISK, "initialize new datafile");
// create a new header page in bytes
var header = new HeaderPage();
if(password != null)
{
_log.Write(Logger.DISK, "datafile encrypted");
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// write bytes on page
this.WritePage(0, header.WritePage());
}
}
public static void Dump(this HeaderPage page, StringBuilder sb)
{
sb.AppendFormat("Change: {0}, Version: {1}, FreeEmptyPageID: {2}, LastPageID: {3}, ColID: {4}",
page.ChangeID,
page.UserVersion,
page.FreeEmptyPageID.Dump(),
page.LastPageID.Dump(),
page.FirstCollectionPageID.Dump());
}
public void Initialize(Logger log, string password)
{
// get log instance to disk
_log = log;
// if is readonly, journal must be disabled
if (_options.FileMode == FileMode.ReadOnly)
{
_options.Journal = false;
}
// open/create file using readonly/exclusive options
_stream = new FileStream(_filename,
_options.FileMode == FileMode.ReadOnly ? System.IO.FileMode.Open : System.IO.FileMode.OpenOrCreate,
_options.FileMode == FileMode.ReadOnly ? FileAccess.Read : FileAccess.ReadWrite,
_options.FileMode == FileMode.Exclusive ? FileShare.None : FileShare.ReadWrite,
BasePage.PAGE_SIZE);
// if file is new, initialize
if (_stream.Length == 0)
{
_log.Write(Logger.DISK, "initialize new datafile");
// set datafile initial size
_stream.SetLength(_options.InitialSize);
// create a new header page in bytes (keep second page empty)
var header = new HeaderPage()
{
LastPageID = 1
};
if (password != null)
{
_log.Write(Logger.DISK, "datafile encrypted");
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// write bytes on page
this.WritePage(0, header.WritePage());
// write second page empty just to use as lock control
this.WritePage(1, new byte[BasePage.PAGE_SIZE]);
}
#if !NET35
// there is no Lock in NetStandard (1.x) - no shared mode
if (_options.FileMode == FileMode.Shared)
{
_options.FileMode = FileMode.Exclusive;
}
#endif
}
/// <summary>
/// Initialize new datafile with header page + lock reserved area zone
/// </summary>
public static void CreateDatabase(Stream stream, string password = null, long initialSize = 0)
{
// calculate how many empty pages will be added on disk
var emptyPages = initialSize == 0 ? 0 : (initialSize - (2 * BasePage.PAGE_SIZE)) / BasePage.PAGE_SIZE;
// if too small size (less than 2 pages), assume no initial size
if (emptyPages < 0)
{
emptyPages = 0;
}
// create a new header page in bytes (keep second page empty)
var header = new HeaderPage
{
LastPageID = initialSize == 0 ? 1 : (uint)emptyPages + 1,
FreeEmptyPageID = initialSize == 0 ? uint.MaxValue : 2
};
if (password != null)
{
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// point to begin file
stream.Seek(0, SeekOrigin.Begin);
// get header page in bytes
var buffer = header.WritePage();
stream.Write(buffer, 0, BasePage.PAGE_SIZE);
// write second page as an empty AREA (it's not a page) just to use as lock control
stream.Write(new byte[BasePage.PAGE_SIZE], 0, BasePage.PAGE_SIZE);
// if initial size is defined, lets create empty pages in a linked list
if (emptyPages > 0)
{
stream.SetLength(initialSize);
var pageID = 1u;
while (++pageID < (emptyPages + 2))
{
var empty = new EmptyPage(pageID)
{
PrevPageID = pageID == 2 ? 0 : pageID - 1,
NextPageID = pageID == emptyPages + 1 ? uint.MaxValue : pageID + 1
};
stream.Write(empty.WritePage(), 0, BasePage.PAGE_SIZE);
}
}
}
public void Initialize(Logger log, string password)
{
// get log instance to disk
_log = log;
// if file not exists, just create empty file
if (!File.Exists(_filename))
{
// readonly
if (_options.ReadOnly)
{
throw LiteException.ReadOnlyDatabase();
}
// open file as create mode
_stream = new FileStream(_filename,
FileMode.CreateNew,
FileAccess.ReadWrite,
FileShare.Read,
BasePage.PAGE_SIZE);
_log.Write(Logger.DISK, "initialize new datafile");
// set datafile initial size
_stream.SetLength(_options.InitialSize);
// create a new header page in bytes
var header = new HeaderPage();
if (password != null)
{
_log.Write(Logger.DISK, "datafile encrypted");
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// write bytes on page
this.WritePage(0, header.WritePage());
}
else
{
// try open file in exclusive mode
TryExec(() =>
{
_stream = new FileStream(_filename,
FileMode.Open,
_options.ReadOnly ? FileAccess.Read : FileAccess.ReadWrite,
_options.ReadOnly ? FileShare.ReadWrite : FileShare.Read,
BasePage.PAGE_SIZE);
});
}
}
/// <summary>
/// Create new database - empty header with password
/// </summary>
public override void CreateNew()
{
var header = new HeaderPage();
header.DbParams.Password = _password;
this.WritePage(0, header.WritePage());
}
public void Initialize(Logger log, string password)
{
// get log instance to disk
_log = log;
// if file not exists, just create empty file
if (!File.Exists(_filename))
{
// readonly
if (_options.ReadOnly) throw LiteException.ReadOnlyDatabase();
// open file as create mode
_stream = new FileStream(_filename,
FileMode.CreateNew,
FileAccess.ReadWrite,
FileShare.Read,
BasePage.PAGE_SIZE);
_log.Write(Logger.DISK, "initialize new datafile");
// set datafile initial size
_stream.SetLength(_options.InitialSize);
// create a new header page in bytes
var header = new HeaderPage();
if(password != null)
{
_log.Write(Logger.DISK, "datafile encrypted");
header.Password = AesEncryption.HashSHA1(password);
header.Salt = AesEncryption.Salt();
}
// write bytes on page
this.WritePage(0, header.WritePage());
}
else
{
// try open file in exclusive mode
TryExec(() =>
{
_stream = new FileStream(_filename,
FileMode.Open,
_options.ReadOnly ? FileAccess.Read : FileAccess.ReadWrite,
_options.ReadOnly ? FileShare.ReadWrite : FileShare.Read,
BasePage.PAGE_SIZE);
});
}
}
private static Dictionary <uint, string> RecoveryCollectionPages(LiteEngine engine, HeaderPage header, StringBuilder log)
{
var result = new Dictionary <uint, string>();
// get collection page
foreach (var col in header.CollectionPages)
{
CollectionPage colPage = null;
try
{
// read collection page
var buffer = engine._disk.ReadPage(col.Value);
var page = BasePage.ReadPage(buffer);
if (page.PageType != PageType.Collection)
{
continue;
}
colPage = page as CollectionPage;
}
catch (Exception ex)
{
log.AppendLine($"Page {col.Value} (Collection) Error: {ex.Message}");
continue;
}
// get all pageID from all valid indexes
var pagesID = new HashSet <uint>(colPage.Indexes.Where(x => x.IsEmpty == false && x.HeadNode.PageID != uint.MaxValue).Select(x => x.HeadNode.PageID));
// load all dataPages from this initial index pageIDs
var dataPages = RecoveryDetectCollectionByIndexPages(engine, pagesID, log);
// populate resultset with this collection name/data page
foreach (var page in dataPages)
{
result[page] = col.Key;
}
}
return(result);
}
/// <summary>
/// Empty cache and header page
/// </summary>
public void Clear(HeaderPage newHeaderPage)
{
_header = newHeaderPage;
_cache.Clear();
}
