public static string GenerateRandomString(int length, CharKinds kinds = CharKinds.UpperLetter | CharKinds.Digit)
{
Util.Check(kinds != CharKinds.None, "CharKinds may not be empty");
var rnd = new Random();
var chars = new char[length];
for (int i = 0; i < length; i++)
{
chars[i] = GenerateRandomChar(rnd, kinds);
}
return(new String(chars));
}
private static CharKinds[] MakeCharClassArray()
{
CharKinds[] a = new CharKinds[65536];
foreach (char c in backslashChars)
{
a[c] = CharKinds.Backslash;
}
foreach (char c in quoteChars)
{
a[c] = CharKinds.Quote;
}
return(a);
}
private static char GenerateRandomChar(Random random, CharKinds kinds)
{
var kind = GetRandomKind(random, kinds);
switch (kind)
{
case CharKinds.Digit: return((char)('0' + random.Next(10)));
case CharKinds.UpperLetter: return((char)('A' + random.Next(26)));
case CharKinds.LowerLetter: return((char)('a' + random.Next(26)));
case CharKinds.SpecialChar:
default:
return(_specialChars[random.Next(_specialChars.Length)]);
}
}
public static string MySQLEscape(this string value)
{
if (!IsQuoting(value))
{
return(value);
}
StringBuilder sb = new StringBuilder();
foreach (char c in value)
{
CharKinds charClass = charClassArray[c];
if (charClass != CharKinds.None)
{
sb.Append("\\");
}
sb.Append(c);
}
return(sb.ToString());
}
private static CharKinds GetRandomKind(Random random, CharKinds kinds)
{
Util.Check(kinds != CharKinds.None, "Char kinds may not be empty.");
// if it is a single kind, just return it.
switch (kinds)
{
case CharKinds.UpperLetter:
case CharKinds.LowerLetter:
case CharKinds.Digit:
case CharKinds.SpecialChar:
return(kinds);
}
// if more than one, throw dice
while (true)
{
var kind = _allKinds[random.Next(_allKinds.Length)];
if (kinds.IsSet(kind))
{
return(kind);
}
}
}
public static bool IsSet(this CharKinds kinds, CharKinds kind)
{
return((kinds & kind) != 0);
}