private RegistryValue AddRegistryValue(string name)
{
byte[] valueList = _hive.RawCellData(_cell.ValueListIndex, _cell.NumValues * 4);
if (valueList == null)
{
valueList = new byte[0];
}
int insertIdx = 0;
while (insertIdx < _cell.NumValues)
{
int valueCellIndex = Utilities.ToInt32LittleEndian(valueList, insertIdx * 4);
ValueCell cell = _hive.GetCell <ValueCell>(valueCellIndex);
if (string.Compare(name, cell.Name, StringComparison.OrdinalIgnoreCase) < 0)
{
break;
}
++insertIdx;
}
// Allocate a new value cell (note _hive.UpdateCell does actual allocation).
ValueCell valueCell = new ValueCell(name);
_hive.UpdateCell(valueCell, true);
// Update the value list, re-allocating if necessary
byte[] newValueList = new byte[(_cell.NumValues * 4) + 4];
Array.Copy(valueList, 0, newValueList, 0, insertIdx * 4);
Utilities.WriteBytesLittleEndian(valueCell.Index, newValueList, insertIdx * 4);
Array.Copy(valueList, insertIdx * 4, newValueList, (insertIdx * 4) + 4, (_cell.NumValues - insertIdx) * 4);
if (_cell.ValueListIndex == -1 || !_hive.WriteRawCellData(_cell.ValueListIndex, newValueList, 0, newValueList.Length))
{
int newListCellIndex = _hive.AllocateRawCell(Utilities.RoundUp(newValueList.Length, 8));
_hive.WriteRawCellData(newListCellIndex, newValueList, 0, newValueList.Length);
if (_cell.ValueListIndex != -1)
{
_hive.FreeCell(_cell.ValueListIndex);
}
_cell.ValueListIndex = newListCellIndex;
}
// Record the new value and save this cell
_cell.NumValues++;
_hive.UpdateCell(_cell, false);
// Finally, set the data in the value cell
return(new RegistryValue(_hive, valueCell));
}
/// <summary>
/// Deletes a named value stored within this key.
/// </summary>
/// <param name="name">The name of the value to delete.</param>
/// <param name="throwOnMissingValue">Throws ArgumentException if <c>name</c> doesn't exist</param>
public void DeleteValue(string name, bool throwOnMissingValue)
{
bool foundValue = false;
if (_cell.NumValues != 0)
{
byte[] valueList = _hive.RawCellData(_cell.ValueListIndex, _cell.NumValues * 4);
int i = 0;
while (i < _cell.NumValues)
{
int valueIndex = Utilities.ToInt32LittleEndian(valueList, i * 4);
ValueCell valueCell = _hive.GetCell <ValueCell>(valueIndex);
if (string.Compare(valueCell.Name, name, StringComparison.OrdinalIgnoreCase) == 0)
{
foundValue = true;
_hive.FreeCell(valueIndex);
_cell.NumValues--;
_hive.UpdateCell(_cell, false);
break;
}
++i;
}
// Move following value's to fill gap
if (i < _cell.NumValues)
{
while (i < _cell.NumValues)
{
int valueIndex = Utilities.ToInt32LittleEndian(valueList, (i + 1) * 4);
Utilities.WriteBytesLittleEndian(valueIndex, valueList, i * 4);
++i;
}
_hive.WriteRawCellData(_cell.ValueListIndex, valueList, 0, _cell.NumValues * 4);
}
// TODO: Update maxbytes for value name and value content if this was the largest value for either.
// Windows seems to repair this info, if not accurate, though.
}
if (throwOnMissingValue && !foundValue)
{
throw new ArgumentException("No such value: " + name, "name");
}
}
private RegistryValue GetRegistryValue(string name)
{
if (name != null && name.Length == 0)
{
name = null;
}
if (_cell.NumValues != 0)
{
byte[] valueList = _hive.RawCellData(_cell.ValueListIndex, _cell.NumValues * 4);
for (int i = 0; i < _cell.NumValues; ++i)
{
int valueIndex = Utilities.ToInt32LittleEndian(valueList, i * 4);
ValueCell cell = _hive.GetCell <ValueCell>(valueIndex);
if (string.Compare(cell.Name, name, StringComparison.OrdinalIgnoreCase) == 0)
{
return(new RegistryValue(_hive, cell));
}
}
}
return(null);
}
internal RegistryValue(RegistryHive hive, ValueCell cell)
{
_hive = hive;
_cell = cell;
}