public bool HasChanges()
{
if (this._readOnly)
{
return(false);
}
if (this._totalLength != this._stream.Length)
{
return(true);
}
long num = 0L;
for (DataBlock dataBlock = this._dataMap.FirstBlock; dataBlock != null; dataBlock = dataBlock.NextBlock)
{
FileDataBlock fileDataBlock = dataBlock as FileDataBlock;
if (fileDataBlock == null || fileDataBlock.FileOffset != num)
{
return(true);
}
num += fileDataBlock.Length;
}
return(num != this._stream.Length);
}
public void WriteByte(long index, byte value)
{
try
{
long blockOffset;
DataBlock dataBlock = this.GetDataBlock(index, out blockOffset);
MemoryDataBlock memoryDataBlock1 = dataBlock as MemoryDataBlock;
if (memoryDataBlock1 != null)
{
memoryDataBlock1.Data[index - blockOffset] = value;
}
else
{
FileDataBlock fileDataBlock1 = (FileDataBlock)dataBlock;
if (blockOffset == index && dataBlock.PreviousBlock != null)
{
MemoryDataBlock memoryDataBlock2 = dataBlock.PreviousBlock as MemoryDataBlock;
if (memoryDataBlock2 != null)
{
memoryDataBlock2.AddByteToEnd(value);
fileDataBlock1.RemoveBytesFromStart(1L);
if (fileDataBlock1.Length != 0L)
{
return;
}
this._dataMap.Remove((DataBlock)fileDataBlock1);
return;
}
}
if (blockOffset + fileDataBlock1.Length - 1L == index && dataBlock.NextBlock != null)
{
MemoryDataBlock memoryDataBlock2 = dataBlock.NextBlock as MemoryDataBlock;
if (memoryDataBlock2 != null)
{
memoryDataBlock2.AddByteToStart(value);
fileDataBlock1.RemoveBytesFromEnd(1L);
if (fileDataBlock1.Length != 0L)
{
return;
}
this._dataMap.Remove((DataBlock)fileDataBlock1);
return;
}
}
FileDataBlock fileDataBlock2 = (FileDataBlock)null;
if (index > blockOffset)
{
fileDataBlock2 = new FileDataBlock(fileDataBlock1.FileOffset, index - blockOffset);
}
FileDataBlock fileDataBlock3 = (FileDataBlock)null;
if (index < blockOffset + fileDataBlock1.Length - 1L)
{
fileDataBlock3 = new FileDataBlock(fileDataBlock1.FileOffset + index - blockOffset + 1L, fileDataBlock1.Length - (index - blockOffset + 1L));
}
DataBlock block = this._dataMap.Replace(dataBlock, (DataBlock) new MemoryDataBlock(value));
if (fileDataBlock2 != null)
{
this._dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
}
if (fileDataBlock3 != null)
{
this._dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
}
finally
{
this.OnChanged(EventArgs.Empty);
}
}
public void WriteByte(long index, byte value)
{
try
{
long blockOffset;
DataBlock dataBlock = this.GetDataBlock(index, out blockOffset);
MemoryDataBlock memoryDataBlock1 = dataBlock as MemoryDataBlock;
if (memoryDataBlock1 != null)
{
memoryDataBlock1.Data[index - blockOffset] = value;
}
else
{
FileDataBlock fileDataBlock1 = (FileDataBlock)dataBlock;
if (blockOffset == index && dataBlock.PreviousBlock != null)
{
MemoryDataBlock memoryDataBlock2 = dataBlock.PreviousBlock as MemoryDataBlock;
if (memoryDataBlock2 != null)
{
memoryDataBlock2.AddByteToEnd(value);
fileDataBlock1.RemoveBytesFromStart(1L);
if (fileDataBlock1.Length != 0L)
return;
this._dataMap.Remove((DataBlock)fileDataBlock1);
return;
}
}
if (blockOffset + fileDataBlock1.Length - 1L == index && dataBlock.NextBlock != null)
{
MemoryDataBlock memoryDataBlock2 = dataBlock.NextBlock as MemoryDataBlock;
if (memoryDataBlock2 != null)
{
memoryDataBlock2.AddByteToStart(value);
fileDataBlock1.RemoveBytesFromEnd(1L);
if (fileDataBlock1.Length != 0L)
return;
this._dataMap.Remove((DataBlock)fileDataBlock1);
return;
}
}
FileDataBlock fileDataBlock2 = (FileDataBlock)null;
if (index > blockOffset)
fileDataBlock2 = new FileDataBlock(fileDataBlock1.FileOffset, index - blockOffset);
FileDataBlock fileDataBlock3 = (FileDataBlock)null;
if (index < blockOffset + fileDataBlock1.Length - 1L)
fileDataBlock3 = new FileDataBlock(fileDataBlock1.FileOffset + index - blockOffset + 1L, fileDataBlock1.Length - (index - blockOffset + 1L));
DataBlock block = this._dataMap.Replace(dataBlock, (DataBlock)new MemoryDataBlock(value));
if (fileDataBlock2 != null)
this._dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
if (fileDataBlock3 != null)
this._dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
finally
{
this.OnChanged(EventArgs.Empty);
}
}
private void MoveFileBlock(FileDataBlock fileBlock, long dataOffset)
{
long nextDataOffset;
FileDataBlock nextFileDataBlock = this.GetNextFileDataBlock((DataBlock)fileBlock, dataOffset, out nextDataOffset);
if (nextFileDataBlock != null && dataOffset + fileBlock.Length > nextFileDataBlock.FileOffset)
this.MoveFileBlock(nextFileDataBlock, nextDataOffset);
if (fileBlock.FileOffset > dataOffset)
{
byte[] buffer = new byte[4096];
long num1 = 0L;
while (num1 < fileBlock.Length)
{
long num2 = fileBlock.FileOffset + num1;
int count = (int)Math.Min((long)buffer.Length, fileBlock.Length - num1);
this._stream.Position = num2;
this._stream.Read(buffer, 0, count);
this._stream.Position = dataOffset + num1;
this._stream.Write(buffer, 0, count);
num1 += (long)buffer.Length;
}
}
else
{
byte[] buffer = new byte[4096];
long num = 0L;
while (num < fileBlock.Length)
{
int count = (int)Math.Min((long)buffer.Length, fileBlock.Length - num);
this._stream.Position = fileBlock.FileOffset + fileBlock.Length - num - (long)count;
this._stream.Read(buffer, 0, count);
this._stream.Position = dataOffset + fileBlock.Length - num - (long)count;
this._stream.Write(buffer, 0, count);
num += (long)buffer.Length;
}
}
fileBlock.SetFileOffset(dataOffset);
}
public void InsertBytes(long index, byte[] bs)
{
try
{
long blockOffset;
DataBlock dataBlock = this.GetDataBlock(index, out blockOffset);
MemoryDataBlock memoryDataBlock1 = dataBlock as MemoryDataBlock;
if (memoryDataBlock1 != null)
{
memoryDataBlock1.InsertBytes(index - blockOffset, bs);
}
else
{
FileDataBlock fileDataBlock1 = (FileDataBlock)dataBlock;
if (blockOffset == index && dataBlock.PreviousBlock != null)
{
MemoryDataBlock memoryDataBlock2 = dataBlock.PreviousBlock as MemoryDataBlock;
if (memoryDataBlock2 != null)
{
memoryDataBlock2.InsertBytes(memoryDataBlock2.Length, bs);
return;
}
}
FileDataBlock fileDataBlock2 = (FileDataBlock)null;
if (index > blockOffset)
fileDataBlock2 = new FileDataBlock(fileDataBlock1.FileOffset, index - blockOffset);
FileDataBlock fileDataBlock3 = (FileDataBlock)null;
if (index < blockOffset + fileDataBlock1.Length)
fileDataBlock3 = new FileDataBlock(fileDataBlock1.FileOffset + index - blockOffset, fileDataBlock1.Length - (index - blockOffset));
DataBlock block = this._dataMap.Replace(dataBlock, (DataBlock)new MemoryDataBlock(bs));
if (fileDataBlock2 != null)
this._dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
if (fileDataBlock3 != null)
this._dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
finally
{
this._totalLength += (long)bs.Length;
this.OnLengthChanged(EventArgs.Empty);
this.OnChanged(EventArgs.Empty);
}
}
