rem: int32 * state, char substitute = B_SUBSTITUTE)
add: int32 * state, char substitute)
context: convert_from_utf8(uint32 dstEncoding,                  const char * src, int32 * srcLen,                   char * dst, int32 * dstLen,                  int32 * state, char substitute = B_SUBSTITUTE){	const BCharacterSet * charset = BCharacterSetRoster::GetCharacterSetByConversionID(dstEncoding);	if (charset == 0) {		return B_ERROR;	}#if DEBUG_CONV	fprintf(stderr, "convert_from_utf8(%s) : \"", charset->GetName());	for (int i = 0 ; i < *srcLen ; i++) {		fprintf(stderr, "%c", src[i]);	}	fprintf(stderr, "\"\n");#endif	return convert_encoding("UTF-8",charset->GetName(),src,srcLen,dst,dstLen,state,substitute);}