/// <summary>
/// Sets the value as raw bytes, with no validation that enough data is specified for the given value type.
/// </summary>
/// <param name="data">The data to store</param>
/// <param name="offset">The offset within <c>data</c> of the first byte to store</param>
/// <param name="count">The number of bytes to store</param>
/// <param name="valueType">The type of the data</param>
public void SetData(byte[] data, int offset, int count, RegistryValueType valueType)
{
// If we can place the data in the DataIndex field, do that to save space / allocation
if ((valueType == RegistryValueType.Dword || valueType == RegistryValueType.DwordBigEndian) && count <= 4)
{
if (_cell.DataLength >= 0)
{
_hive.FreeCell(_cell.DataIndex);
}
_cell.DataLength = (int)((uint)count | 0x80000000);
_cell.DataIndex = Utilities.ToInt32LittleEndian(data, offset);
_cell.DataType = valueType;
}
else
{
if (_cell.DataIndex == -1 || _cell.DataLength < 0)
{
_cell.DataIndex = _hive.AllocateRawCell(count);
}
if (!_hive.WriteRawCellData(_cell.DataIndex, data, offset, count))
{
int newDataIndex = _hive.AllocateRawCell(count);
_hive.WriteRawCellData(newDataIndex, data, offset, count);
_hive.FreeCell(_cell.DataIndex);
_cell.DataIndex = newDataIndex;
}
_cell.DataLength = count;
_cell.DataType = valueType;
}
_hive.UpdateCell(_cell, false);
}
/// <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");
}
}
