private static int SkipQtextOrQuotedPair(
string s,
int index,
int endIndex,
QuotedStringRule rule) {
if (index >= endIndex) {
return index;
}
int i2;
if (rule == QuotedStringRule.Http) {
char c = s[index];
// NOTE: Space and tab were handled earlier;
// bytes higher than 0x7f are part of obs-text
if (c < 0x100 && c >= 0x21 && c != 0x7F && c != '\\' && c != '"') {
return index + 1;
}
i2 = SkipQuotedPair(s, index, endIndex);
return i2;
}
if (rule == QuotedStringRule.Rfc5322) {
i2 = index;
// qtext (RFC5322 sec. 3.2.1)
if (i2 < endIndex) {
char c = s[i2];
// Non-ASCII (allowed in internationalized email headers under
// RFC6532)
if ((c & 0xfc00) == 0xd800 && i2 + 1 < endIndex && s[i2 + 1] >=
0xdc00 && s[i2 + 1] <= 0xdfff) {
i2 += 2;
} else if ((c & 0xf800) == 0xd800) {
// unchanged; it's a bare surrogate
} else if (c >= 0x80) {
++i2;
}
if (c >= 33 && c <= 126 && c != '\\' && c != '"') {
++i2;
}
// obs-qtext (same as obs-ctext)
if ((c < 0x20 && c != 0x00 && c != 0x09 && c != 0x0a && c != 0x0d) ||
c == 0x7f) {
++i2;
}
}
if (index != i2) {
return i2;
}
index = i2;
i2 = HeaderParser.ParseQuotedPair(s, index, endIndex, null);
return i2;
}
throw new ArgumentException(rule.ToString());
}
private static int skipQtextOrQuotedPair(
string s, int index, int endIndex, QuotedStringRule rule)
{
if(index>=endIndex)return index;
int i2;
if(rule==QuotedStringRule.Http){
char c=s[index];
if(c<0x100 && c>=0x21 && c!='\\' && c!='"')
return index+1;
i2=skipQuotedPair(s,index,endIndex);
if(index!=i2)return i2;
return i2;
} else if(rule==QuotedStringRule.Rfc5322){
i2=skipQtext(s,index,endIndex);
if(index!=i2)return i2;
index=i2;
i2=skipQuotedPair(s,index,endIndex);
if(index!=i2)return i2;
return i2;
} else if(rule==QuotedStringRule.Smtp){
char c=s[index];
if(c>=0x20 && c<=0x7E && c!='\\' && c!='"')
return index+1;
i2=skipQuotedPairSMTP(s,index,endIndex);
if(index!=i2)return i2;
return i2;
} else
throw new ArgumentException(rule.ToString());
}