function write_UInt32LE(x/*:number*/, o) {
	if(!o) o = new_buf(4);
	o.write_shift(4, x);
	return o;
}

/* [MS-XLSB] 2.5.168 */
function parse_XLWideString(data/*::, length*/)/*:string*/ {
	var cchCharacters = data.read_shift(4);
	return cchCharacters === 0 ? "" : data.read_shift(cchCharacters, 'dbcs');
}
function write_XLWideString(data/*:string*/, o) {
	var _null = false; if(o == null) { _null = true; o = new_buf(4+2*data.length); }
	o.write_shift(4, data.length);
	if(data.length > 0) o.write_shift(0, data, 'dbcs');
	return _null ? o.slice(0, o.l) : o;
}

/* [MS-XLSB] 2.5.143 */
function parse_StrRun(data, length/*:?number*/) {
	return { ich: data.read_shift(2), ifnt: data.read_shift(2) };
}
function write_StrRun(run, o) {
	if(!o) o = new_buf(4);
	o.write_shift(2, run.ich || 0);
	o.write_shift(2, run.ifnt || 0);
	return o;
}

/* [MS-XLSB] 2.1.7.121 */
function parse_RichStr(data, length/*:number*/)/*:XLString*/ {
	var start = data.l;
	var flags = data.read_shift(1);
	var str = parse_XLWideString(data);
	var rgsStrRun = [];
	var z = ({ t: str, h: str }/*:any*/);
	if((flags & 1) !== 0) { /* fRichStr */
		/* TODO: formatted string */
		var dwSizeStrRun = data.read_shift(4);
		for(var i = 0; i != dwSizeStrRun; ++i) rgsStrRun.push(parse_StrRun(data));
		z.r = rgsStrRun;
	}
	else z.r = [{ich:0, ifnt:0}];
	//if((flags & 2) !== 0) { /* fExtStr */
	//	/* TODO: phonetic string */
	//}
	data.l = start + length;
	return z;
}
function write_RichStr(str/*:XLString*/, o/*:?Block*/)/*:Block*/ {
	/* TODO: formatted string */
	var _null = false; if(o == null) { _null = true; o = new_buf(15+4*str.t.length); }
	o.write_shift(1,0);
	write_XLWideString(str.t, o);
	return _null ? o.slice(0, o.l) : o;
}
/* [MS-XLSB] 2.4.325 BrtCommentText (RichStr w/1 run) */
var parse_BrtCommentText = parse_RichStr;
function write_BrtCommentText(str/*:XLString*/, o/*:?Block*/)/*:Block*/ {
	/* TODO: formatted string */
	var _null = false; if(o == null) { _null = true; o = new_buf(23+4*str.t.length); }
	o.write_shift(1,1);
	write_XLWideString(str.t, o);
	o.write_shift(4,1);
	write_StrRun({ich:0,ifnt:0}, o);
	return _null ? o.slice(0, o.l) : o;
}

/* [MS-XLSB] 2.5.9 */
function parse_XLSBCell(data)/*:any*/ {
	var col = data.read_shift(4);
	var iStyleRef = data.read_shift(2);
	iStyleRef += data.read_shift(1) <<16;
	var fPhShow = data.read_shift(1);
	return { c:col, iStyleRef: iStyleRef };
}
function write_XLSBCell(cell/*:any*/, o/*:?Block*/) {
	if(o == null) o = new_buf(8);
	o.write_shift(-4, cell.c);
	o.write_shift(3, cell.iStyleRef || cell.s);
	o.write_shift(1, 0); /* fPhShow */
	return o;
}


/* [MS-XLSB] 2.5.21 */
var parse_XLSBCodeName = parse_XLWideString;
var write_XLSBCodeName = write_XLWideString;

/* [MS-XLSB] 2.5.166 */
function parse_XLNullableWideString(data/*::, length*/)/*:string*/ {
	var cchCharacters = data.read_shift(4);
	return cchCharacters === 0 || cchCharacters === 0xFFFFFFFF ? "" : data.read_shift(cchCharacters, 'dbcs');
}
function write_XLNullableWideString(data/*:string*/, o) {
	var _null = false; if(o == null) { _null = true; o = new_buf(127); }
	o.write_shift(4, data.length > 0 ? data.length : 0xFFFFFFFF);
	if(data.length > 0) o.write_shift(0, data, 'dbcs');
	return _null ? o.slice(0, o.l) : o;
}

/* [MS-XLSB] 2.5.165 */
var parse_XLNameWideString = parse_XLWideString;
var write_XLNameWideString = write_XLWideString;

/* [MS-XLSB] 2.5.114 */
var parse_RelID = parse_XLNullableWideString;
var write_RelID = write_XLNullableWideString;


/* [MS-XLSB] 2.5.122 */
/* [MS-XLS] 2.5.217 */
function parse_RkNumber(data)/*:number*/ {
	var b = data.slice(data.l, data.l+4);
	var fX100 = b[0] & 1, fInt = b[0] & 2;
	data.l+=4;
	b[0] &= 0xFC; // b[0] &= ~3;
	var RK = fInt === 0 ? __double([0,0,0,0,b[0],b[1],b[2],b[3]],0) : __readInt32LE(b,0)>>2;
	return fX100 ? RK/100 : RK;
}
function write_RkNumber(data/*:number*/, o) {
	if(o == null) o = new_buf(4);
	var fX100 = 0, fInt = 0, d100 = data * 100;
	if(data == (data | 0) && data >= -(1<<29) && data < (1 << 29)) { fInt = 1; }
	else if(d100 == (d100 | 0) && d100 >= -(1<<29) && d100 < (1 << 29)) { fInt = 1; fX100 = 1; }
	if(fInt) o.write_shift(-4, ((fX100 ? d100 : data) << 2) + (fX100 + 2));
	else throw new Error("unsupported RkNumber " + data); // TODO
}


/* [MS-XLSB] 2.5.117 RfX */
function parse_RfX(data /*::, length*/)/*:Range*/ {
	var cell/*:Range*/ = ({s: {}, e: {}}/*:any*/);
	cell.s.r = data.read_shift(4);
	cell.e.r = data.read_shift(4);
	cell.s.c = data.read_shift(4);
	cell.e.c = data.read_shift(4);
	return cell;
}

function write_RfX(r/*:Range*/, o) {
	if(!o) o = new_buf(16);
	o.write_shift(4, r.s.r);
	o.write_shift(4, r.e.r);
	o.write_shift(4, r.s.c);
	o.write_shift(4, r.e.c);
	return o;
}

/* [MS-XLSB] 2.5.153 UncheckedRfX */
var parse_UncheckedRfX = parse_RfX;
var write_UncheckedRfX = write_RfX;

/* [MS-XLSB] 2.5.171 */
/* [MS-XLS] 2.5.342 */
/* TODO: error checking, NaN and Infinity values are not valid Xnum */
function parse_Xnum(data, length/*:?number*/) { return data.read_shift(8, 'f'); }
function write_Xnum(data, o) { return (o || new_buf(8)).write_shift(8, data, 'f'); }

/* [MS-XLSB] 2.5.198.2 */
var BErr = {
	/*::[*/0x00/*::]*/: "#NULL!",
	/*::[*/0x07/*::]*/: "#DIV/0!",
	/*::[*/0x0F/*::]*/: "#VALUE!",
	/*::[*/0x17/*::]*/: "#REF!",
	/*::[*/0x1D/*::]*/: "#NAME?",
	/*::[*/0x24/*::]*/: "#NUM!",
	/*::[*/0x2A/*::]*/: "#N/A",
	/*::[*/0x2B/*::]*/: "#GETTING_DATA",
	/*::[*/0xFF/*::]*/: "#WTF?"
};
var RBErr = evert_num(BErr);

/* [MS-XLSB] 2.4.321 BrtColor */
function parse_BrtColor(data, length/*:number*/) {
	var out = {};
	var d = data.read_shift(1);

	var fValidRGB = d & 1;
	var xColorType = d >>> 1;

	var index = data.read_shift(1);
	var nTS = data.read_shift(2, 'i');
	var bR = data.read_shift(1);
	var bG = data.read_shift(1);
	var bB = data.read_shift(1);
	var bAlpha = data.read_shift(1);

	switch(xColorType) {
		case 0: out.auto = 1; break;
		case 1:
			out.index = index;
			var icv = XLSIcv[index];
			/* automatic pseudo index 81 */
			if(icv) out.rgb = rgb2Hex(icv);
			break;
		case 2:
			/* if(!fValidRGB) throw new Error("invalid"); */
			out.rgb = rgb2Hex([bR, bG, bB]);
			break;
		case 3: out.theme = index; break;
	}
	if(nTS != 0) out.tint = nTS > 0 ? nTS / 32767 : nTS / 32768;

	return out;
}
function write_BrtColor(color, o) {
	if(!o) o = new_buf(8);
	if(!color||color.auto) { o.write_shift(4, 0); o.write_shift(4, 0); return o; }
	if(color.index) {
		o.write_shift(1, 0x02);
		o.write_shift(1, color.index);
	} else if(color.theme) {
		o.write_shift(1, 0x06);
		o.write_shift(1, color.theme);
	} else {
		o.write_shift(1, 0x05);
		o.write_shift(1, 0);
	}
	var nTS = color.tint || 0;
	if(nTS > 0) nTS *= 32767;
	else if(nTS < 0) nTS *= 32768;
	o.write_shift(2, nTS);
	if(!color.rgb) {
		o.write_shift(2, 0);
		o.write_shift(1, 0);
		o.write_shift(1, 0);
	} else {
		var rgb = (color.rgb || 'FFFFFF');
		o.write_shift(1, parseInt(rgb.substr(0,2),16));
		o.write_shift(1, parseInt(rgb.substr(2,2),16));
		o.write_shift(1, parseInt(rgb.substr(4,2),16));
		o.write_shift(1, 0xFF);
	}
	return o;
}

/* [MS-XLSB] 2.5.52 */
function parse_FontFlags(data, length/*:number*/, opts) {
	var d = data.read_shift(1);
	data.l++;
	var out = {
		/* fBold: d & 0x01 */
		fItalic: d & 0x02,
		/* fUnderline: d & 0x04 */
		fStrikeout: d & 0x08,
		fOutline: d & 0x10,
		fShadow: d & 0x20,
		fCondense: d & 0x40,
		fExtend: d & 0x80
	};
	return out;
}
function write_FontFlags(font, o) {
	if(!o) o = new_buf(2);
	var grbit =
		(font.italic   ? 0x02 : 0) |
		(font.strike   ? 0x08 : 0) |
		(font.outline  ? 0x10 : 0) |
		(font.shadow   ? 0x20 : 0) |
		(font.condense ? 0x40 : 0) |
		(font.extend   ? 0x80 : 0);
	o.write_shift(1, grbit);
	o.write_shift(1, 0);
	return o;
}

