public void AddFirst(DataBlock block)
{
if (this._firstBlock == null)
this.AddBlockToEmptyMap(block);
else
this.AddBeforeInternal(this._firstBlock, block);
}
void IEnumerator.Reset()
{
if (this._version != this._map._version)
throw new InvalidOperationException("Collection was modified after the enumerator was instantiated.");
this._index = -1;
this._current = (DataBlock)null;
}
internal Enumerator(DataMap map)
{
this._map = map;
this._version = map._version;
this._current = (DataBlock)null;
this._index = -1;
}
private void RemoveInternal(DataBlock block)
{
DataBlock dataBlock1 = block._previousBlock;
DataBlock dataBlock2 = block._nextBlock;
if (dataBlock1 != null)
dataBlock1._nextBlock = dataBlock2;
if (dataBlock2 != null)
dataBlock2._previousBlock = dataBlock1;
if (this._firstBlock == block)
this._firstBlock = dataBlock2;
this.InvalidateBlock(block);
--this._count;
++this._version;
}
private void InvalidateBlock(DataBlock block)
{
block._map = (DataMap)null;
block._nextBlock = (DataBlock)null;
block._previousBlock = (DataBlock)null;
}
private void InvalidateBlock(DataBlock block)
{
block._map = (DataMap)null;
block._nextBlock = (DataBlock)null;
block._previousBlock = (DataBlock)null;
}
public void AddLast(DataBlock block)
{
if (this._firstBlock == null)
this.AddBlockToEmptyMap(block);
else
this.AddAfterInternal(this.GetLastBlock(), block);
}
public void AddBefore(DataBlock block, DataBlock newBlock)
{
this.AddBeforeInternal(block, newBlock);
}
public void Remove(DataBlock block)
{
this.RemoveInternal(block);
}
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 FileDataBlock GetNextFileDataBlock(DataBlock block, long dataOffset, out long nextDataOffset)
{
nextDataOffset = dataOffset + block.Length;
for (block = block.NextBlock; block != null; block = block.NextBlock)
{
FileDataBlock fileDataBlock = block as FileDataBlock;
if (fileDataBlock != null)
return fileDataBlock;
nextDataOffset += block.Length;
}
return (FileDataBlock)null;
}
public void Remove(DataBlock block)
{
this.RemoveInternal(block);
}
public void AddBefore(DataBlock block, DataBlock newBlock)
{
this.AddBeforeInternal(block, newBlock);
}
public void AddAfter(DataBlock block, DataBlock newBlock)
{
this.AddAfterInternal(block, newBlock);
}
public bool MoveNext()
{
if (this._version != this._map._version)
throw new InvalidOperationException("Collection was modified after the enumerator was instantiated.");
if (this._index >= this._map.Count)
return false;
this._current = ++this._index != 0 ? this._current.NextBlock : this._map.FirstBlock;
return this._index < this._map.Count;
}
public void AddAfter(DataBlock block, DataBlock newBlock)
{
this.AddAfterInternal(block, newBlock);
}
public DataBlock Replace(DataBlock block, DataBlock newBlock)
{
this.AddAfterInternal(block, newBlock);
this.RemoveInternal(block);
return newBlock;
}
private void AddBeforeInternal(DataBlock block, DataBlock newBlock)
{
newBlock._nextBlock = block;
newBlock._previousBlock = block._previousBlock;
newBlock._map = this;
if (block._previousBlock != null)
block._previousBlock._nextBlock = newBlock;
block._previousBlock = newBlock;
if (this._firstBlock == block)
this._firstBlock = newBlock;
++this._version;
++this._count;
}
private void AddBlockToEmptyMap(DataBlock block)
{
block._map = this;
block._nextBlock = (DataBlock)null;
block._previousBlock = (DataBlock)null;
this._firstBlock = block;
++this._version;
++this._count;
}
public void Clear()
{
DataBlock nextBlock;
for (DataBlock block = this.FirstBlock; block != null; block = nextBlock)
{
nextBlock = block.NextBlock;
this.InvalidateBlock(block);
}
this._firstBlock = (DataBlock)null;
this._count = 0;
++this._version;
}
public DataBlock Replace(DataBlock block, DataBlock newBlock)
{
this.AddAfterInternal(block, newBlock);
this.RemoveInternal(block);
return(newBlock);
}
