private async Task WriteEscapedString(string str, CancellationToken cancellationToken)
{
int cue = 0;
for (int i = 0; i < str.Length; i++)
{
byte[] escapedChar = StompOctets.EscapeOctet(str[i]);
if (escapedChar != null)
{
await _writer.WriteAsync(str, cue, i - cue, cancellationToken);
await _writer.WriteAsync(escapedChar, cancellationToken);
cue = i + 1;
}
}
await _writer.WriteAsync(str, cue, str.Length - cue, cancellationToken);
}
private async Task <IEnumerable <KeyValuePair <string, string> > > ReadHeaders(CancellationToken cancellationToken)
{
StringBuilder stringBuilder = new StringBuilder();
var headers = new List <KeyValuePair <string, string> >();
while (true)
{
// Get Header Name
char ch = await _reader.ReadCharAsync(cancellationToken);
if (ch == '\n')
{
break;
}
else if (ch == '\r')
{
if (await _reader.ReadCharAsync(cancellationToken) == '\n')
{
break;
}
throw new InvalidDataException("Header data MUST not contain CR, LF or ':' characters.");
}
stringBuilder.Clear();
while (ch != ':')
{
if (ch == '\n' || ch == '\r')
{
throw new InvalidDataException("Headers data MUST not contain CR, LF or ':' characters.");
}
else if (ch == '\\')
{
stringBuilder.Append(StompOctets.UnescapeOctet(await _reader.ReadCharAsync(cancellationToken)));
}
else
{
stringBuilder.Append(ch);
}
ch = await _reader.ReadCharAsync(cancellationToken);
}
string headerName = stringBuilder.ToString();
// Get Header Value
ch = await _reader.ReadCharAsync(cancellationToken);
stringBuilder.Clear();
while (ch != '\n' && ch != '\r')
{
if (ch == ':')
{
throw new InvalidDataException("Headers data MUST not contain CR, LF or ':' characters.");
}
else if (ch == '\\')
{
stringBuilder.Append(StompOctets.UnescapeOctet(await _reader.ReadCharAsync(cancellationToken)));
}
else
{
stringBuilder.Append(ch);
}
ch = await _reader.ReadCharAsync(cancellationToken);
}
if (ch == '\r' && await _reader.ReadCharAsync(cancellationToken) != '\n')
{
throw new InvalidDataException("Header data MUST not contain CR, LF or ':' characters.");
}
string headerValue = stringBuilder.ToString();
headers.Add(new KeyValuePair <string, string>(headerName, headerValue));
}
return(headers);
}
