public void WriteByte(long index, byte value) { try { long blockOffset; DataBlock block = GetDataBlock(index, out blockOffset); MemoryDataBlock memoryBlock = block as MemoryDataBlock; if (memoryBlock != null) { memoryBlock.Data[index - blockOffset] = value; return; } FileDataBlock fileBlock = (FileDataBlock)block; if (blockOffset == index && block.PreviousBlock != null) { MemoryDataBlock previousMemoryBlock = block.PreviousBlock as MemoryDataBlock; if (previousMemoryBlock != null) { previousMemoryBlock.AddByteToEnd(value); fileBlock.RemoveBytesFromStart(1); if (fileBlock.Length == 0) { _dataMap.Remove(fileBlock); } return; } } if (blockOffset + fileBlock.Length - 1 == index && block.NextBlock != null) { MemoryDataBlock nextMemoryBlock = block.NextBlock as MemoryDataBlock; if (nextMemoryBlock != null) { nextMemoryBlock.AddByteToStart(value); fileBlock.RemoveBytesFromEnd(1); if (fileBlock.Length == 0) { _dataMap.Remove(fileBlock); } return; } } FileDataBlock prefixBlock = null; if (index > blockOffset) { prefixBlock = new FileDataBlock(fileBlock.FileOffset, index - blockOffset); } FileDataBlock suffixBlock = null; if (index < blockOffset + fileBlock.Length - 1) { suffixBlock = new FileDataBlock( fileBlock.FileOffset + index - blockOffset + 1, fileBlock.Length - (index - blockOffset + 1)); } block = _dataMap.Replace(block, new MemoryDataBlock(value)); if (prefixBlock != null) { _dataMap.AddBefore(block, prefixBlock); } if (suffixBlock != null) { _dataMap.AddAfter(block, suffixBlock); } } finally { OnChanged(EventArgs.Empty); } }
public DataBlock Replace(DataBlock block, DataBlock newBlock) { AddAfterInternal(block, newBlock); RemoveInternal(block); return(newBlock); }
public void Remove(DataBlock block) { RemoveInternal(block); }
public void AddBefore(DataBlock block, DataBlock newBlock) { AddBeforeInternal(block, newBlock); }
public void AddAfter(DataBlock block, DataBlock newBlock) { AddAfterInternal(block, newBlock); }
void InvalidateBlock(DataBlock block) { block._map = null; block._nextBlock = null; block._previousBlock = null; }