public static ProtectedString operator +(ProtectedString a, string b)
{
ProtectedString psB = new ProtectedString(false, b);
return(a + psB);
}
public ProtectedString Insert(int iStart, string strInsert)
{
if (iStart < 0)
{
throw new ArgumentOutOfRangeException("iStart");
}
if (strInsert == null)
{
throw new ArgumentNullException("strInsert");
}
if (strInsert.Length == 0)
{
return(this);
}
if (!m_bIsProtected)
{
return(new ProtectedString(false, ReadString().Insert(
iStart, strInsert)));
}
UTF8Encoding utf8 = StrUtil.Utf8;
char[] v = ReadChars(), vNew = null;
byte[] pbNew = null;
ProtectedString ps;
try
{
if (iStart > v.Length)
{
throw new ArgumentOutOfRangeException("iStart");
}
char[] vIns = strInsert.ToCharArray();
vNew = new char[v.Length + vIns.Length];
Array.Copy(v, 0, vNew, 0, iStart);
Array.Copy(vIns, 0, vNew, iStart, vIns.Length);
Array.Copy(v, iStart, vNew, iStart + vIns.Length,
v.Length - iStart);
pbNew = utf8.GetBytes(vNew);
ps = new ProtectedString(true, pbNew);
Debug.Assert(utf8.GetString(pbNew, 0, pbNew.Length) ==
ReadString().Insert(iStart, strInsert));
}
finally
{
MemUtil.ZeroArray <char>(v);
if (vNew != null)
{
MemUtil.ZeroArray <char>(vNew);
}
if (pbNew != null)
{
MemUtil.ZeroByteArray(pbNew);
}
}
return(ps);
}
