private void WriteAndFold(string value, int charsAlreadyOnLine, bool allowUnicode)
{
int lastSpace = 0, startOfLine = 0;
for (int index = 0; index < value.Length; index++)
{
// When we find a FWS (CRLF) copy it as is.
if (MailBnfHelper.IsFWSAt(value, index)) // At the first char of "\r\n " or "\r\n\t"
{
index += 2; // Skip the FWS
this.bufferBuilder.Append(value, startOfLine, index - startOfLine, allowUnicode);
// Reset for the next line
startOfLine = index;
lastSpace = index;
charsAlreadyOnLine = 0;
}
// When we pass the line length limit, and know where there was a space to fold at, fold there
else if (((index - startOfLine) > (this.lineLength - charsAlreadyOnLine)) &&
lastSpace != startOfLine)
{
this.bufferBuilder.Append(value, startOfLine, lastSpace - startOfLine, allowUnicode);
this.bufferBuilder.Append(CRLF);
startOfLine = lastSpace;
charsAlreadyOnLine = 0;
}
// Mark a foldable space. If we go over the line length limit, fold here.
else if (value[index] == MailBnfHelper.Space || value[index] == MailBnfHelper.Tab)
{
lastSpace = index;
}
}
// Write any remaining data to the buffer.
if (value.Length - startOfLine > 0)
{
this.bufferBuilder.Append(value, startOfLine, value.Length - startOfLine, allowUnicode);
}
}