// -----------------------------
// ---- PAL layer ends here ----
// -----------------------------
private void EnsureCapacity(int capacity)
{
// Make sure the requested capacity doesn't exceed SecureString's defined limit
if (capacity > MaxLength)
{
throw new ArgumentOutOfRangeException("capacity", SR.ArgumentOutOfRange_Capacity);
}
// If we already have enough space allocated, we're done
if (_buffer != null && (capacity * sizeof(char)) <= (int)_buffer.ByteLength)
{
return;
}
// We need more space, so allocate a new buffer, copy all our data into it,
// and then swap the new for the old.
ProtectedBuffer newBuffer = ProtectedBuffer.Allocate(capacity * sizeof(char));
if (_buffer != null)
{
using (_buffer.Unprotect())
ProtectedBuffer.Copy(_buffer, newBuffer, _buffer.ByteLength);
newBuffer.Protect();
_buffer.Dispose();
}
_buffer = newBuffer;
}
[System.Security.SecurityCritical] // auto-generated
internal unsafe SecureString(SecureString str)
{
// Allocate enough space to store the provided string
EnsureCapacity(str._decryptedLength);
_decryptedLength = str._decryptedLength;
// Copy the string into the newly allocated space
if (_decryptedLength > 0)
{
using (str._buffer.Unprotect())
ProtectedBuffer.Copy(str._buffer, _buffer, (ulong)(str._decryptedLength * sizeof(char)));
}
// Protect the buffer
_buffer.Protect();
}
