/// <summary>
/// Find all occurance of byte[] in stream and return an IEnumerable contening index when is find.
/// </summary>
/// <param name="findtest"></param>
public IEnumerable <long> FindIndexOf(byte[] bytesTofind, long startPosition = 0)
{
//start position checkup
if (startPosition > Length)
{
startPosition = Length;
}
else if (startPosition < 0)
{
startPosition = 0;
}
//var
Position = startPosition;
byte[] buffer = new byte[ConstantReadOnly.FIND_BLOCK_SIZE];
IEnumerable <long> findindex;
List <long> indexList = new List <long>();
//Launch event at process strated
IsOnLongProcess = true;
LongProcessProgressStarted?.Invoke(this, new EventArgs());
//start find
for (long i = startPosition; i < Length; i++)
{
//Do not freeze UI...
if (i % 2000 == 0)
{
LongProcessProgress = (double)Position / Length;
}
//Break long process if needed
if (!IsOnLongProcess)
{
break;
}
if ((byte)ReadByte() == bytesTofind[0])
{
//position correction after read one byte
Position--;
i--;
if (buffer.Length > Length - Position)
{
buffer = new byte[Length - Position];
}
//read buffer and find
_stream.Read(buffer, 0, buffer.Length);
findindex = buffer.FindIndexOf(bytesTofind);
//if byte if find add to list
if (findindex.Count() > 0)
{
foreach (long index in findindex)
{
indexList.Add(index + i + 1);
}
}
//position correction
i += buffer.Length;
}
}
//Yield return all finded occurence
foreach (long index in indexList)
{
yield return(index);
}
//Launch event at process completed
IsOnLongProcess = false;
LongProcessProgressCompleted?.Invoke(this, new EventArgs());
}
/// <summary>
/// Submit change to files/stream
/// TODO : NEED OPTIMISATION FOR LARGE FILE... IT'S AS BEGINING :) USE TEMPS FILE ?
/// TODO : USE TEMPS FILE FOR LARGE FILE
/// </summary>
public void SubmitChanges()
{
if (CanWrite)
{
//Set percent of progress to zero and create and iterator for help mesure progress
LongProcessProgress = 0;
int i = 0;
//Create appropriate temp stream for new file.
Stream NewStream = null;
if (Length < ConstantReadOnly.LARGE_FILE_LENGTH)
{
NewStream = new MemoryStream();
}
else
{
NewStream = File.Open(Path.GetTempFileName(), FileMode.Open, FileAccess.ReadWrite);
}
//Fast change only nothing byte deleted or added
if (ByteModifieds(ByteAction.Deleted).Count() == 0 &&
ByteModifieds(ByteAction.Added).Count() == 0)
{
//Launch event at process strated
IsOnLongProcess = true;
LongProcessProgressStarted?.Invoke(this, new EventArgs());
var bytemodifiedList = ByteModifieds(ByteAction.Modified);
double countChange = bytemodifiedList.Count();
i = 0;
//Fast save. only save byteaction=modified
foreach (ByteModified bm in bytemodifiedList)
{
if (bm.IsValid)
{
//Set percent of progress
LongProcessProgress = i++ / countChange;
//Break process?
if (!IsOnLongProcess)
{
break;
}
_stream.Position = bm.BytePositionInFile;
_stream.WriteByte(bm.Byte.Value);
}
}
//Launch event at process completed
IsOnLongProcess = false;
LongProcessProgressCompleted?.Invoke(this, new EventArgs());
}
else
{
//Launch event at process strated
IsOnLongProcess = true;
LongProcessProgressStarted?.Invoke(this, new EventArgs());
byte[] buffer = new byte[ConstantReadOnly.COPY_BLOCK_SIZE];
long bufferlength = 0;
var SortedBM = ByteModifieds(ByteAction.All).OrderBy(b => b.BytePositionInFile);
double countChange = SortedBM.Count();
i = 0;
//Set position
Position = 0;
////Start update and rewrite file.
foreach (ByteModified nextByteModified in SortedBM)
{
//Set percent of progress
LongProcessProgress = (i++ / countChange);
//Break process?
if (!IsOnLongProcess)
{
break;
}
//Reset buffer
buffer = new byte[ConstantReadOnly.COPY_BLOCK_SIZE];
//start read/write / use little block for optimize memory
while (Position != nextByteModified.BytePositionInFile)
{
bufferlength = nextByteModified.BytePositionInFile - Position;
//TEMPS
if (bufferlength < 0)
{
bufferlength = 1;
}
//EOF
if (bufferlength < ConstantReadOnly.COPY_BLOCK_SIZE)
{
buffer = new byte[bufferlength];
}
_stream.Read(buffer, 0, buffer.Length);
NewStream.Write(buffer, 0, buffer.Length);
}
//Apply ByteAction!
switch (nextByteModified.Action)
{
case ByteAction.Added:
//TODO : IMPLEMENTING ADD BYTE
break;
case ByteAction.Deleted:
//NOTHING TODO we dont want to add deleted byte
Position++;
break;
case ByteAction.Modified:
Position++;
NewStream.WriteByte(nextByteModified.Byte.Value);
break;
}
//Read/Write the last section of file
if (nextByteModified.BytePositionInFile == SortedBM.Last().BytePositionInFile)
{
while (!EOF)
{
bufferlength = _stream.Length - Position;
//EOF
if (bufferlength < ConstantReadOnly.COPY_BLOCK_SIZE)
{
buffer = new byte[bufferlength];
}
_stream.Read(buffer, 0, buffer.Length);
NewStream.Write(buffer, 0, buffer.Length);
}
}
}
//Write new data to current stream
Position = 0;
NewStream.Position = 0;
buffer = new byte[ConstantReadOnly.COPY_BLOCK_SIZE];
while (!EOF)
{
//Set percent of progress
LongProcessProgress = ((double)Position / (double)Length);
//Break process?
if (!IsOnLongProcess)
{
break;
}
bufferlength = _stream.Length - Position;
//EOF
if (bufferlength < ConstantReadOnly.COPY_BLOCK_SIZE)
{
buffer = new byte[bufferlength];
}
NewStream.Read(buffer, 0, buffer.Length);
_stream.Write(buffer, 0, buffer.Length);
}
_stream.SetLength(NewStream.Length);
//dispose resource
NewStream.Close();
buffer = null;
//Launch event at process completed
IsOnLongProcess = false;
LongProcessProgressCompleted?.Invoke(this, new EventArgs());
}
//Launch event
ChangesSubmited?.Invoke(this, new EventArgs());
}
else
{
throw new Exception("Cannot write to file.");
}
}
