public bool HasChanges()
{
if (_readOnly)
{
return(false);
}
if (_totalLength != _stream.Length)
{
return(true);
}
long num = 0L;
for (DataBlock dataBlock = _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 != _stream.Length);
}
private void MoveFileBlock(FileDataBlock fileBlock, long dataOffset)
{
long nextDataOffset;
FileDataBlock nextFileDataBlock = GetNextFileDataBlock((DataBlock)fileBlock, dataOffset, out nextDataOffset);
if (nextFileDataBlock != null && dataOffset + fileBlock.Length > nextFileDataBlock.FileOffset)
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);
_stream.Position = num2;
_stream.Read(buffer, 0, count);
_stream.Position = dataOffset + num1;
_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);
_stream.Position = fileBlock.FileOffset + fileBlock.Length - num - (long)count;
_stream.Read(buffer, 0, count);
_stream.Position = dataOffset + fileBlock.Length - num - (long)count;
_stream.Write(buffer, 0, count);
num += (long)buffer.Length;
}
}
fileBlock.SetFileOffset(dataOffset);
}
public void WriteByte(long index, byte value)
{
try
{
long blockOffset;
DataBlock dataBlock = 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;
_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;
_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 = _dataMap.Replace(dataBlock, (DataBlock)new MemoryDataBlock(value));
if (fileDataBlock2 != null)
_dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
if (fileDataBlock3 == null)
return;
_dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
finally
{
OnChanged(EventArgs.Empty);
}
}
public void InsertBytes(long index, byte[] bs)
{
try
{
long blockOffset;
DataBlock dataBlock = 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 = _dataMap.Replace(dataBlock, (DataBlock)new MemoryDataBlock(bs));
if (fileDataBlock2 != null)
_dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
if (fileDataBlock3 == null)
return;
_dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
finally
{
_totalLength += (long)bs.Length;
OnLengthChanged(EventArgs.Empty);
OnChanged(EventArgs.Empty);
}
}
public void WriteByte(long index, byte value)
{
try
{
long num;
DataBlock dataBlock = this.GetDataBlock(index, out num);
MemoryDataBlock block2 = dataBlock as MemoryDataBlock;
if (block2 != null)
{
block2.Data[(int)((IntPtr)(index - num))] = value;
}
else
{
FileDataBlock block = (FileDataBlock)dataBlock;
if ((num == index) && (dataBlock.PreviousBlock != null))
{
MemoryDataBlock previousBlock = dataBlock.PreviousBlock as MemoryDataBlock;
if (previousBlock != null)
{
previousBlock.AddByteToEnd(value);
block.RemoveBytesFromStart(1L);
if (block.Length == 0L)
{
this._dataMap.Remove(block);
}
return;
}
}
if ((((num + block.Length) - 1L) == index) && (dataBlock.NextBlock != null))
{
MemoryDataBlock nextBlock = dataBlock.NextBlock as MemoryDataBlock;
if (nextBlock != null)
{
nextBlock.AddByteToStart(value);
block.RemoveBytesFromEnd(1L);
if (block.Length == 0L)
{
this._dataMap.Remove(block);
}
return;
}
}
FileDataBlock newBlock = null;
if (index > num)
{
newBlock = new FileDataBlock(block.FileOffset, index - num);
}
FileDataBlock block7 = null;
if (index < ((num + block.Length) - 1L))
{
block7 = new FileDataBlock(((block.FileOffset + index) - num) + 1L, block.Length - ((index - num) + 1L));
}
dataBlock = this._dataMap.Replace(dataBlock, new MemoryDataBlock(value));
if (newBlock != null)
{
this._dataMap.AddBefore(dataBlock, newBlock);
}
if (block7 != null)
{
this._dataMap.AddAfter(dataBlock, block7);
}
}
}
finally
{
this.OnChanged(EventArgs.Empty);
}
}
public void WriteByte(long index, byte value)
{
try
{
long blockOffset;
DataBlock dataBlock = 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;
}
_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;
}
_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 = _dataMap.Replace(dataBlock, (DataBlock) new MemoryDataBlock(value));
if (fileDataBlock2 != null)
{
_dataMap.AddBefore(block, (DataBlock)fileDataBlock2);
}
if (fileDataBlock3 == null)
{
return;
}
_dataMap.AddAfter(block, (DataBlock)fileDataBlock3);
}
}
finally
{
OnChanged(EventArgs.Empty);
}
}
public void WriteByte(long index, byte value)
{
try
{
long num;
DataBlock dataBlock = this.GetDataBlock(index, out num);
MemoryDataBlock block2 = dataBlock as MemoryDataBlock;
if (block2 != null)
{
block2.Data[(int) ((IntPtr) (index - num))] = value;
}
else
{
FileDataBlock block = (FileDataBlock) dataBlock;
if ((num == index) && (dataBlock.PreviousBlock != null))
{
MemoryDataBlock previousBlock = dataBlock.PreviousBlock as MemoryDataBlock;
if (previousBlock != null)
{
previousBlock.AddByteToEnd(value);
block.RemoveBytesFromStart(1L);
if (block.Length == 0L)
{
this._dataMap.Remove(block);
}
return;
}
}
if ((((num + block.Length) - 1L) == index) && (dataBlock.NextBlock != null))
{
MemoryDataBlock nextBlock = dataBlock.NextBlock as MemoryDataBlock;
if (nextBlock != null)
{
nextBlock.AddByteToStart(value);
block.RemoveBytesFromEnd(1L);
if (block.Length == 0L)
{
this._dataMap.Remove(block);
}
return;
}
}
FileDataBlock newBlock = null;
if (index > num)
{
newBlock = new FileDataBlock(block.FileOffset, index - num);
}
FileDataBlock block7 = null;
if (index < ((num + block.Length) - 1L))
{
block7 = new FileDataBlock(((block.FileOffset + index) - num) + 1L, block.Length - ((index - num) + 1L));
}
dataBlock = this._dataMap.Replace(dataBlock, new MemoryDataBlock(value));
if (newBlock != null)
{
this._dataMap.AddBefore(dataBlock, newBlock);
}
if (block7 != null)
{
this._dataMap.AddAfter(dataBlock, block7);
}
}
}
finally
{
this.OnChanged(EventArgs.Empty);
}
}
private void MoveFileBlock(FileDataBlock fileBlock, long dataOffset)
{
long num;
FileDataBlock block = this.GetNextFileDataBlock(fileBlock, dataOffset, out num);
if ((block != null) && ((dataOffset + fileBlock.Length) > block.FileOffset))
{
this.MoveFileBlock(block, num);
}
if (fileBlock.FileOffset > dataOffset)
{
byte[] buffer = new byte[0x1000];
for (long i = 0L; i < fileBlock.Length; i += buffer.Length)
{
long num3 = fileBlock.FileOffset + i;
int count = (int) Math.Min((long) buffer.Length, fileBlock.Length - i);
this._stream.Position = num3;
this._stream.Read(buffer, 0, count);
long num5 = dataOffset + i;
this._stream.Position = num5;
this._stream.Write(buffer, 0, count);
}
}
else
{
byte[] buffer2 = new byte[0x1000];
for (long j = 0L; j < fileBlock.Length; j += buffer2.Length)
{
int num7 = (int) Math.Min((long) buffer2.Length, fileBlock.Length - j);
long num8 = ((fileBlock.FileOffset + fileBlock.Length) - j) - num7;
this._stream.Position = num8;
this._stream.Read(buffer2, 0, num7);
long num9 = ((dataOffset + fileBlock.Length) - j) - num7;
this._stream.Position = num9;
this._stream.Write(buffer2, 0, num7);
}
}
fileBlock.SetFileOffset(dataOffset);
}
public void InsertBytes(long index, byte[] bs)
{
try
{
long num;
DataBlock dataBlock = this.GetDataBlock(index, out num);
MemoryDataBlock block2 = dataBlock as MemoryDataBlock;
if (block2 != null)
{
block2.InsertBytes(index - num, bs);
}
else
{
FileDataBlock block3 = (FileDataBlock) dataBlock;
if ((num == index) && (dataBlock.PreviousBlock != null))
{
MemoryDataBlock previousBlock = dataBlock.PreviousBlock as MemoryDataBlock;
if (previousBlock != null)
{
previousBlock.InsertBytes(previousBlock.Length, bs);
return;
}
}
FileDataBlock newBlock = null;
if (index > num)
{
newBlock = new FileDataBlock(block3.FileOffset, index - num);
}
FileDataBlock block6 = null;
if (index < (num + block3.Length))
{
block6 = new FileDataBlock((block3.FileOffset + index) - num, block3.Length - (index - num));
}
dataBlock = this._dataMap.Replace(dataBlock, new MemoryDataBlock(bs));
if (newBlock != null)
{
this._dataMap.AddBefore(dataBlock, newBlock);
}
if (block6 != null)
{
this._dataMap.AddAfter(dataBlock, block6);
}
}
}
finally
{
this._totalLength += bs.Length;
this.OnLengthChanged(EventArgs.Empty);
this.OnChanged(EventArgs.Empty);
}
}
