/// <summary>
/// Reads RFC 822 'quoted-string' from source stream.
/// </summary>
/// <returns>Returns RFC 822 'quoted-string' or null if end of stream reached.</returns>
/// <exception cref="InvalidOperationException">Is raised when source stream has no quoted-string at current position.</exception>
/// <exception cref="ArgumentException">Is raised when not valid 'quoted-string'.</exception>
public string QuotedString()
{
/* RFC 2822 3.2.5.
* qtext = NO-WS-CTL / ; Non white space controls
%d33 / ; The rest of the US-ASCII
%d35-91 / ; characters not including "\"
%d93-126 ; or the quote character
qcontent = qtext / quoted-pair
quoted-string = [CFWS] DQUOTE *([FWS] qcontent) [FWS] DQUOTE [CFWS]
*/
ToFirstChar();
if (Peek(false) != '"')
{
throw new InvalidOperationException("No quoted-string available.");
}
// Read start DQUOTE.
Char(false);
string retVal = "";
bool escape = false;
while (true)
{
int intC = Char(false);
// We reached end of stream, invalid quoted string, end quote is missing.
if (intC == -1)
{
throw new ArgumentException("Invalid quoted-string, end quote is missing.");
}
// This char is escaped.
else if (escape)
{
escape = false;
retVal += (char) intC;
}
// Closing DQUOTE.
else if (intC == '"')
{
break;
}
// Next char is escaped.
else if (intC == '\\')
{
escape = true;
}
// Skip folding chars.
else if (intC == '\r' || intC == '\n') {}
// Normal char in quoted-string.
else
{
retVal += (char) intC;
}
}
return MIME_Encoding_EncodedWord.DecodeAll(retVal);
}
/// <summary>
/// Parses header field from the specified value.
/// </summary>
/// <param name="value">Header field value. Header field name must be included. For example: 'Content-Type: text/plain'.</param>
/// <returns>Returns parsed header field.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>value</b> is null reference.</exception>
/// <exception cref="ParseException">Is raised when header field parsing errors.</exception>
public static MIME_h_Unstructured Parse(string value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
MIME_h_Unstructured retVal = new MIME_h_Unstructured();
string[] name_value = value.Split(new[] { ':' }, 2);
if (name_value[0].Trim() == string.Empty)
{
throw new ParseException("Invalid header field '" + value + "' syntax.");
}
retVal.m_Name = name_value[0];
retVal.m_Value = MIME_Encoding_EncodedWord.DecodeAll(
MIME_Utils.UnfoldHeader(name_value.Length == 2 ? name_value[1].TrimStart() : ""));
retVal.m_ParseValue = value;
return(retVal);
}
