Function getUTF8SequenceSize

3rdparty/ConvertUTF/ConvertUTF.cpp:441–445

* Exported function to return the size of the first utf-8 code unit sequence, * Or 0 if the sequence is not valid; */

 * Or 0 if the sequence is not valid;
 */
unsigned getUTF8SequenceSize(const UTF8 *source, const UTF8 *sourceEnd) {
  int length = trailingBytesForUTF8[*source] + 1;
  return (length <= sourceEnd - source && isLegalUTF8(source, length)) ? length
                                                                       : 0;
}

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