private int ReadContentAsBinary( byte[] buffer, int index, int count ) {
Debug.Assert( decoder != null );
if ( isEnd ) {
Reset();
return 0;
}
decoder.SetNextOutputBuffer( buffer, index, count );
for (;;) {
// use streaming ReadValueChunk if the reader supports it
if ( canReadValueChunk ) {
for (;;) {
if ( valueOffset < valueChunkLength ) {
int decodedCharsCount = decoder.Decode( valueChunk, valueOffset, valueChunkLength - valueOffset );
valueOffset += decodedCharsCount;
}
if ( decoder.IsFull ) {
return decoder.DecodedCount;
}
Debug.Assert( valueOffset == valueChunkLength );
if ( ( valueChunkLength = reader.ReadValueChunk( valueChunk, 0, ChunkSize ) ) == 0 ) {
break;
}
valueOffset = 0;
}
}
else {
// read what is reader.Value
string value = reader.Value;
int decodedCharsCount = decoder.Decode( value, valueOffset, value.Length - valueOffset );
valueOffset += decodedCharsCount;
if ( decoder.IsFull ) {
return decoder.DecodedCount;
}
}
valueOffset = 0;
// move to next textual node in the element content; throw on sub elements
if ( !MoveToNextContentNode( true ) ) {
isEnd = true;
return decoder.DecodedCount;
}
}
}