unsigned char *dst = byteArrayPtr->bytes;
    unsigned char *dstEnd = dst + numBytes;
    const char *srcEnd = src + length;
    int proper = 1;

    for (; src < srcEnd && dst < dstEnd; ) {
	int ch;
	int count = TclUtfToUniChar(src, &ch);
	Tcl_Size count = TclUtfToUniChar(src, &ch);

	if (ch > 255) {
	    proper = 0;
	    if (demandProper) {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "expected byte sequence but character %"

    }
    TclNewObj(resultObj);
    if (count > 0) {
	unsigned char *cursor = NULL;

	size = (((count * 4) / 3) + 3) & ~3;	/* ensure 4 byte chunks */
	if (maxlen > 0 && size > maxlen) {
	    int adjusted = size + (wrapcharlen * (size / maxlen));
	    Tcl_Size adjusted = size + (wrapcharlen * (size / maxlen));

	    if (size % maxlen == 0) {
		adjusted -= wrapcharlen;
	    }
	    size = adjusted;

	    if (purewrap == 0) {

	}

	/*
	 * Translate that grouping into (up to) three binary bytes output.
	 */

	if (lineLen > 0) {
	    *cursor++ = (((d[0] - 0x20) & 0x3F) << 2)
	    *cursor++ = (unsigned char)(((d[0] - 0x20) & 0x3F) << 2)
		    | (((d[1] - 0x20) & 0x3F) >> 4);
	    if (--lineLen > 0) {
		*cursor++ = (((d[1] - 0x20) & 0x3F) << 4)
		*cursor++ = (unsigned char)(((d[1] - 0x20) & 0x3F) << 4)
			| (((d[2] - 0x20) & 0x3F) >> 2);
		if (--lineLen > 0) {
		    *cursor++ = (((d[2] - 0x20) & 0x3F) << 6)
			    | (((d[3] - 0x20) & 0x3F));
		    *cursor++ = (unsigned char)((((d[2] - 0x20) & 0x3F) << 6)
			    | (((d[3] - 0x20) & 0x3F)));
		    lineLen--;
		}
	    }
	}

	/*
	 * If we've reached the end of the line, skip until we process a