private static void EscapeString(ReadOnlySpan <byte> value, Span <byte> destination, JavaScriptEncoder encoder, ref int written)
{
Debug.Assert(encoder != null);
OperationStatus result = encoder.EncodeUtf8(value, destination, out int encoderBytesConsumed, out int encoderBytesWritten);
Debug.Assert(result != OperationStatus.DestinationTooSmall);
Debug.Assert(result != OperationStatus.NeedMoreData);
Debug.Assert(encoderBytesConsumed == value.Length);
if (result != OperationStatus.Done)
{
ThrowHelper.ThrowArgumentException_InvalidUTF8(value.Slice(encoderBytesWritten));
}
written += encoderBytesWritten;
}
public static void EscapeString(ReadOnlySpan <byte> value, Span <byte> destination, int indexOfFirstByteToEscape, JavaScriptEncoder encoder, out int written)
{
Debug.Assert(indexOfFirstByteToEscape >= 0 && indexOfFirstByteToEscape < value.Length);
value.Slice(0, indexOfFirstByteToEscape).CopyTo(destination);
written = indexOfFirstByteToEscape;
int consumed = indexOfFirstByteToEscape;
if (encoder != null)
{
OperationStatus result = encoder.EncodeUtf8(
value.Slice(consumed), destination.Slice(written), out int encoderBytesConsumed, out int encoderBytesWritten);
Debug.Assert(result != OperationStatus.DestinationTooSmall);
Debug.Assert(result != OperationStatus.NeedMoreData);
Debug.Assert(encoderBytesConsumed == value.Length - consumed);
if (result != OperationStatus.Done)
{
ThrowHelper.ThrowArgumentException_InvalidUTF8(value.Slice(encoderBytesWritten));
}
written += encoderBytesWritten;
}
else
{
// For performance when no encoder is specified, perform escaping here for Ascii and on the
// first occurrence of a non-Ascii character, then call into the default encoder.
while (consumed < value.Length)
{
byte val = value[consumed];
if (IsAsciiValue(val))
{
if (NeedsEscapingNoBoundsCheck(val))
{
EscapeNextBytes(val, destination, ref written);
consumed++;
}
else
{
destination[written] = val;
written++;
consumed++;
}
}
else
{
// Fall back to default encoder
OperationStatus result = JavaScriptEncoder.Default.EncodeUtf8(
value.Slice(consumed), destination.Slice(written), out int encoderBytesConsumed, out int encoderBytesWritten);
Debug.Assert(result != OperationStatus.DestinationTooSmall);
Debug.Assert(result != OperationStatus.NeedMoreData);
Debug.Assert(encoderBytesConsumed == value.Length - consumed);
if (result != OperationStatus.Done)
{
ThrowHelper.ThrowArgumentException_InvalidUTF8(value.Slice(encoderBytesConsumed));
}
consumed += encoderBytesConsumed;
written += encoderBytesWritten;
}
}
}
}