// Token: 0x06000246 RID: 582 RVA: 0x0000A13C File Offset: 0x0000833C
public static bool IsValidDomain(string address, int offset, bool checkLength, bool allowUTF8 = false)
{
if (string.IsNullOrEmpty(address) || (checkLength && address.Length - offset > 255))
{
return(false);
}
MimeAddressParser.ValidationStage validationStage = MimeAddressParser.ValidationStage.DOMAIN;
int num = 0;
int num2 = 0;
int num3 = 0;
bool flag = false;
int num4 = 0;
while (offset < address.Length && validationStage != MimeAddressParser.ValidationStage.ERROR)
{
char c = address[offset];
offset++;
switch (validationStage)
{
case MimeAddressParser.ValidationStage.DOMAIN:
if (c == '[')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL;
continue;
}
if ((c < '\u0080' && MimeScan.IsAlphaOrDigit((byte)c)) || (c >= '\u0080' && allowUTF8) || c == '-' || c == '_')
{
num4 = offset;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_SUB;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_SUB:
if (c == '.')
{
if (checkLength && offset - num4 > 63)
{
return(false);
}
validationStage = MimeAddressParser.ValidationStage.DOMAIN_DOT;
continue;
}
else if ((c < '\u0080' && MimeScan.IsAlphaOrDigit((byte)c)) || (c >= '\u0080' && allowUTF8) || c == '-' || c == '_')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_SUB;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_DOT:
if ((c < '\u0080' && MimeScan.IsAlphaOrDigit((byte)c)) || (c >= '\u0080' && allowUTF8) || c == '-' || c == '_')
{
num4 = offset;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_SUB;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL:
if (c < '\u0080' && MimeScan.IsDigit((byte)c))
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4;
num = 1;
num2 = 1;
num3 = (int)(c - '0');
continue;
}
if (c == 'I' || c == 'i')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_I;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4:
if (c < '\u0080' && MimeScan.IsDigit((byte)c) && num2 < 3)
{
num2++;
num3 = num3 * 10 + (int)(c - '0');
if (num3 <= 255)
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4;
continue;
}
}
else
{
if (c == '.')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4_DOT;
continue;
}
if (c == ']' && num == 4)
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_END;
continue;
}
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4_DOT:
if (c < '\u0080' && MimeScan.IsDigit((byte)c) && num < 4)
{
num++;
num2 = 1;
num3 = (int)(c - '0');
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_I:
if (c == 'P' || c == 'p')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IP;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IP:
if (c == 'v' || c == 'V')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV:
if (c == '6')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6:
if (c == ':')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_:
if (c < '\u0080' && MimeScan.IsHex((byte)c))
{
flag = false;
num = 1;
num2 = 1;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP;
continue;
}
if (c == ':')
{
num = 0;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_STARTCOLON;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_STARTCOLON:
if (c == ':')
{
flag = true;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COMP;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP:
if (c < '\u0080' && MimeScan.IsHex((byte)c) && num2 < 4)
{
num2++;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP;
continue;
}
if (c == ':')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COLON;
continue;
}
if (c == ']' && ((!flag && num == 8) || (flag && num <= 6)))
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_END;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_V4GRP:
if (c < '\u0080' && MimeScan.IsDigit((byte)c) && num2 < 3)
{
num2++;
num3 = num3 * 10 + (int)(c - '0');
validationStage = ((num3 <= 255) ? MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_V4GRP : MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP);
continue;
}
if (c < '\u0080' && MimeScan.IsHex((byte)c) && num2 < 4)
{
num2++;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP;
continue;
}
if (c == ':')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COLON;
continue;
}
if (c == '.')
{
num = 1;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV4_DOT;
continue;
}
if (c == ']' && flag && num <= 6)
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_END;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COLON:
if ((c < '\u0080' && MimeScan.IsDigit((byte)c) && !flag && num == 6) || (flag && num <= 4))
{
num++;
num2 = 1;
num3 = (int)(c - '0');
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_V4GRP;
continue;
}
if ((c < '\u0080' && MimeScan.IsHex((byte)c) && !flag && num < 8) || (flag && num < 6))
{
num++;
num2 = 1;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP;
continue;
}
if (c == ':' && !flag && num <= 6)
{
flag = true;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COMP;
continue;
}
break;
case MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_COMP:
if (c < '\u0080' && MimeScan.IsHex((byte)c) && num < 6)
{
num++;
num2 = 1;
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_IPV6_GRP;
continue;
}
if (c == ']')
{
validationStage = MimeAddressParser.ValidationStage.DOMAIN_LITERAL_END;
continue;
}
break;
}
validationStage = MimeAddressParser.ValidationStage.ERROR;
}
return(validationStage == MimeAddressParser.ValidationStage.DOMAIN_LITERAL_END || (validationStage == MimeAddressParser.ValidationStage.DOMAIN_SUB && (!checkLength || offset - num4 < 63)));
}