ReadContentAsBase64() private method

private ReadContentAsBase64 ( byte buffer, int index, int count ) : int
buffer byte
index int
count int
return int
        public override int ReadContentAsBase64( byte[] buffer, int index, int count ) {
            if ( ReadState != ReadState.Interactive ) {
                return 0;
            }

            if ( state != State.InReadBinary ) {
                // forward ReadBase64Chunk calls into the base (wrapped) reader if possible, i.e. if it can read binary and we 
                // should not check characters
                if ( base.CanReadBinaryContent && ( !checkCharacters ) ) {
                    readBinaryHelper = null;
                    state = State.InReadBinary;
                    return base.ReadContentAsBase64( buffer, index, count );
                }
                // the wrapped reader cannot read chunks or we are on an element where we should check characters or ignore white spaces
                else {
                    readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, this );
                }
            }
            else { 
                // forward calls into wrapped reader 
                if ( readBinaryHelper == null ) {
                    return base.ReadContentAsBase64( buffer, index, count );
                }
            }

            // turn off InReadBinary state in order to have a normal Read() behavior when called from readBinaryHelper
            state = State.Interactive;

            // call to the helper
            int readCount = readBinaryHelper.ReadContentAsBase64(buffer, index, count);

            // turn on InReadBinary in again and return
            state = State.InReadBinary;
            return readCount;
        }
        public override int  ReadContentAsBase64(byte[] buffer, int index, int count)
        {
            if (ReadState != ReadState.Interactive)
            {
                return(0);
            }

            // init ReadChunkHelper if called the first time
            if (parsingFunction != ParsingFunction.InReadBinaryContent)
            {
                readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset(readBinaryHelper, outerReader);
            }

            // set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
            parsingFunction = ParsingFunction.Read;

            // call to the helper
            int readCount = readBinaryHelper.ReadContentAsBase64(buffer, index, count);

            // setup parsingFunction
            parsingFunction = ParsingFunction.InReadBinaryContent;
            return(readCount);
        }