private static int SkipQuotedString(
string str,
int index,
int endIndex,
StringBuilder builder, // receives the unescaped version of the string
QuotedStringRule rule) {
int startIndex = index;
int valueBLength = (builder == null) ? 0 : builder.Length;
index = (rule != QuotedStringRule.Rfc5322) ? index :
HeaderParser.ParseCFWS(str, index, endIndex, null);
if (!(index < endIndex && str[index] == '"')) {
if (builder != null) {
builder.Length = valueBLength;
}
return startIndex; // not a valid quoted-string
}
++index;
while (index < endIndex) {
int i2 = index;
if (rule == QuotedStringRule.Http) {
if (str[index] == ' ' || str[index] == '\t') {
if (builder != null) {
builder.Append(str[index]);
}
++index;
continue;
}
} else if (rule == QuotedStringRule.Rfc5322) {
// Skip tabs, spaces, and folding whitespace
i2 = ParseFWSLax(str, index, endIndex, builder);
}
index = i2;
char c = str[index];
if (c == '"') { // end of quoted-string
++index;
// NOTE: Don't skip CFWS even if the rule is Rfc5322
return index;
}
int oldIndex = index;
index = SkipQtextOrQuotedPair(str, index, endIndex, rule);
if (index == oldIndex) {
if (builder != null) {
builder.Remove(valueBLength, (builder.Length)-valueBLength);
}
return startIndex;
}
if (builder != null) {
// this is a qtext or quoted-pair, so
// append the last character read
builder.Append(str[index - 1]);
}
}
if (builder != null) {
builder.Remove(valueBLength, (builder.Length)-valueBLength);
}
return startIndex; // not a valid quoted-string
}
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());
}
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());
}
internal static int skipQuotedString(
string s,
int index,
int endIndex,
StringBuilder builder, // receives the unescaped version of the _string
QuotedStringRule rule // rule to follow for quoted _string
)
{
int startIndex=index;
int bLength=(builder==null) ? 0 : builder.Length;
index=(rule!=QuotedStringRule.Rfc5322) ? index : skipCFWS(s,index,endIndex,null);
if(!(index<endIndex && s[index]=='"')){
if(builder!=null) {
builder.Length=(bLength);
}
return startIndex; // not a valid quoted-_string
}
index++;
while(index<endIndex){
int i2=index;
if(rule==QuotedStringRule.Http) {
i2=skipLws(s,index,endIndex,builder);
} else if(rule==QuotedStringRule.Rfc5322) {
i2=skipFws(s,index,endIndex,builder);
}
index=i2;
char c=s[index];
if(c=='"'){ // end of quoted-_string
index++;
if(rule==QuotedStringRule.Rfc5322)
return skipCFWS(s,index,endIndex,null);
else
return index;
}
int oldIndex=index;
index=skipQtextOrQuotedPair(s,index,endIndex,rule);
if(index==oldIndex){
if(builder!=null) {
builder.Remove(bLength,(builder.Length)-(bLength));
}
return startIndex;
}
if(builder!=null){
// this is a qtext or quoted-pair, so
// append the last character read
builder.Append(s[index-1]);
}
}
if(builder!=null) {
builder.Remove(bLength,(builder.Length)-(bLength));
}
return startIndex; // not a valid quoted-_string
}