/// <summary>
/// Reads string-literal(stores it to reader 'r') and continuing fetch line.
/// </summary>
/// <param name="imap">IMAP client.</param>
/// <param name="r">String reader.</param>
/// <param name="callback">Fetch completion callback.</param>
/// <returns>Returns true if completed asynchronously or false if completed synchronously.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>imap</b>,<b>r</b> or <b>callback</b> is null reference.</exception>
private bool ReadStringLiteral(IMAP_Client imap,StringReader r,EventHandler<EventArgs<Exception>> callback)
{
if(imap == null){
throw new ArgumentNullException("imap");
}
if(r == null){
throw new ArgumentNullException("r");
}
if(callback == null){
throw new ArgumentNullException("callback");
}
if(r.SourceString.EndsWith("}") && r.SourceString.IndexOf("{") > -1){
MemoryStream stream = new MemoryStream();
string size = r.SourceString.Substring(r.SourceString.LastIndexOf("{") + 1,r.SourceString.Length - r.SourceString.LastIndexOf("{") - 2);
// Remove {n} from string.
r.RemoveFromEnd(r.SourceString.Length - r.SourceString.LastIndexOf('{'));
IMAP_Client.ReadStringLiteralAsyncOP op = new IMAP_Client.ReadStringLiteralAsyncOP(stream,Convert.ToInt32(size));
op.CompletedAsync += delegate(object sender,EventArgs<IMAP_Client.ReadStringLiteralAsyncOP> e){
try{
// Read string literal failed.
if(op.Error != null){
callback(this,new EventArgs<Exception>(op.Error));
}
else{
// Append string-literal to fetch reader.
r.AppendString(TextUtils.QuoteString(Encoding.UTF8.GetString(stream.ToArray())));
// Read next fetch line completed synchronously.
if(!ReadNextFetchLine(imap,r,callback)){
ParseDataItems(imap,r,callback);
}
}
}
catch(Exception x){
callback(this,new EventArgs<Exception>(x));
}
finally{
op.Dispose();
}
};
// Read string literal completed sync.
if(!imap.ReadStringLiteralAsync(op)){
try{
// Read string literal failed.
if(op.Error != null){
callback(this,new EventArgs<Exception>(op.Error));
return true;
}
else{
// Append string-literal to fetch reader.
r.AppendString(TextUtils.QuoteString(Encoding.UTF8.GetString(stream.ToArray())));
return ReadNextFetchLine(imap,r,callback);
}
}
finally{
op.Dispose();
}
}
// Read string literal completed async.
else{
return true;
}
}
else{
throw new ParseException("No string-literal available '" + r.SourceString + "'.");
}
}
/// <summary>
/// Reads IMAP string(string-literal,quoted-string,NIL) and remaining FETCH line if needed.
/// </summary>
/// <param name="imap">IMAP client.</param>
/// <param name="r">Fetch line reader.</param>
/// <param name="callback">Fetch completion callback.</param>
/// <param name="stream">Stream where to store readed data.</param>
/// <returns>Returns true if completed asynchronously or false if completed synchronously.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>imap</b>,<b>r</b>,<b>callback</b> or <b>stream</b> is null reference.</exception>
private bool ReadData(IMAP_Client imap,StringReader r,EventHandler<EventArgs<Exception>> callback,Stream stream)
{
if(imap == null){
throw new ArgumentNullException("imap");
}
if(r == null){
throw new ArgumentNullException("r");
}
if(callback == null){
throw new ArgumentNullException("callback");
}
if(stream == null){
throw new ArgumentNullException("stream");
}
r.ReadToFirstChar();
// We don't have data.
if(r.StartsWith("NIL",false)){
// Eat NIL.
r.ReadWord();
return false;
}
// Data value is returned as string-literal.
else if(r.StartsWith("{",false)){
IMAP_Client.ReadStringLiteralAsyncOP op = new IMAP_Client.ReadStringLiteralAsyncOP(stream,Convert.ToInt32(r.ReadParenthesized()));
op.CompletedAsync += delegate(object sender,EventArgs<IMAP_Client.ReadStringLiteralAsyncOP> e){
try{
// Read string literal failed.
if(op.Error != null){
callback(this,new EventArgs<Exception>(op.Error));
}
else{
// Read next fetch line completed synchronously.
if(!ReadNextFetchLine(imap,r,callback)){
ParseDataItems(imap,r,callback);
}
}
}
catch(Exception x){
callback(this,new EventArgs<Exception>(x));
}
finally{
op.Dispose();
}
};
// Read string literal completed sync.
if(!imap.ReadStringLiteralAsync(op)){
try{
// Read string literal failed.
if(op.Error != null){
callback(this,new EventArgs<Exception>(op.Error));
return true;
}
else{
// Read next fetch line completed synchronously.
if(!ReadNextFetchLine(imap,r,callback)){
return false;
}
else{
return true;
}
}
}
finally{
op.Dispose();
}
}
// Read string literal completed async.
else{
return true;
}
}
// Data is quoted-string.
else{
byte[] data = Encoding.UTF8.GetBytes(r.ReadWord());
stream.Write(data,0,data.Length);
return false;
}
}