System.Windows.Forms.MemoryDataBlock.InsertBytes C# (CSharp) Method

        public void InsertBytes(long position, byte[] data)
        {
            byte[] newData = new byte[_data.LongLength + data.LongLength];
            if (position > 0)
            {
                Array.Copy(_data, 0, newData, 0, position);
            }
            Array.Copy(data, 0, newData, position, data.LongLength);
            if (position < _data.LongLength)
            {
                Array.Copy(_data, position, newData, position + data.LongLength, _data.LongLength - position);
            }
            _data = newData;
        }

        /// <summary>
        /// See <see cref="IByteProvider.InsertBytes" /> for more information.
        /// </summary>
        public void InsertBytes(long index, byte[] bs)
        {
            try
            {
                // Find the block affected.
                long      blockOffset;
                DataBlock block = GetDataBlock(index, out blockOffset);

                // If the insertion point is in a memory block, just insert it.
                MemoryDataBlock memoryBlock = block as MemoryDataBlock;
                if (memoryBlock != null)
                {
                    memoryBlock.InsertBytes(index - blockOffset, bs);
                    return;
                }

                FileDataBlock fileBlock = (FileDataBlock)block;

                // If the insertion point is at the start of a file block, and the previous block is a memory block, append it to that block.
                if (blockOffset == index && block.PreviousBlock != null)
                {
                    MemoryDataBlock previousMemoryBlock = block.PreviousBlock as MemoryDataBlock;
                    if (previousMemoryBlock != null)
                    {
                        previousMemoryBlock.InsertBytes(previousMemoryBlock.Length, bs);
                        return;
                    }
                }

                // Split the block into a prefix and a suffix and place a memory block in-between.
                FileDataBlock prefixBlock = null;
                if (index > blockOffset)
                {
                    prefixBlock = new FileDataBlock(fileBlock.FileOffset, index - blockOffset);
                }

                FileDataBlock suffixBlock = null;
                if (index < blockOffset + fileBlock.Length)
                {
                    suffixBlock = new FileDataBlock(
                        fileBlock.FileOffset + index - blockOffset,
                        fileBlock.Length - (index - blockOffset));
                }

                block = _dataMap.Replace(block, new MemoryDataBlock(bs));

                if (prefixBlock != null)
                {
                    _dataMap.AddBefore(block, prefixBlock);
                }

                if (suffixBlock != null)
                {
                    _dataMap.AddAfter(block, suffixBlock);
                }
            }
            finally
            {
                _totalLength += bs.Length;
                OnLengthChanged(EventArgs.Empty);
                OnChanged(EventArgs.Empty);
            }
        }