var WK_ = /*#__PURE__*/(function() {
	function lotushopper(data, cb/*:RecordHopperCB*/, opts/*:any*/) {
		if(!data) return;
		prep_blob(data, data.l || 0);
		var Enum = opts.Enum || WK1Enum;
		while(data.l < data.length) {
			var RT = data.read_shift(2);
			var R = Enum[RT] || Enum[0xFFFF];
			var length = data.read_shift(2);
			var tgt = data.l + length;
			var d = R.f && R.f(data, length, opts);
			data.l = tgt;
			if(cb(d, R, RT)) return;
		}
	}

	function lotus_to_workbook(d/*:RawData*/, opts) {
		switch(opts.type) {
			case 'base64': return lotus_to_workbook_buf(s2a(Base64_decode(d)), opts);
			case 'binary': return lotus_to_workbook_buf(s2a(d), opts);
			case 'buffer':
			case 'array': return lotus_to_workbook_buf(d, opts);
		}
		throw "Unsupported type " + opts.type;
	}

	/* NOTE: this list intentionally starts at 1 */
	var LOTUS_DATE_FMTS = [
		"mmmm",
		"dd-mmm-yyyy",
		"dd-mmm",
		"mmm-yyyy",
		"@", // "text"?
		"mm/dd",
		"hh:mm:ss AM/PM", // 7
		"hh:mm AM/PM",
		"mm/dd/yyyy",
		"mm/dd",
		"hh:mm:ss",
		"hh:mm" // 12
	];

	function lotus_to_workbook_buf(d, opts)/*:Workbook*/ {
		if(!d) return d;
		var o = opts || {};
		if(DENSE != null && o.dense == null) o.dense = DENSE;
		var s/*:Worksheet*/ = ({}/*:any*/), n = "Sheet1", next_n = "", sidx = 0;
		var sheets = {}, snames = [], realnames = [], sdata = [];
		if(o.dense) sdata = s["!data"] = [];

		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
		var sheetRows = o.sheetRows || 0;
		var lastcell = {};

		if(d[4] == 0x51 && d[5] == 0x50 && d[6] == 0x57) return qpw_to_workbook_buf(d, opts);
		if(d[2] == 0x00) {
			if(d[3] == 0x08 || d[3] == 0x09) {
				if(d.length >= 16 && d[14] == 0x05 && d[15] === 0x6c) throw new Error("Unsupported Works 3 for Mac file");
			}
		}

		if(d[2] == 0x02) {
			o.Enum = WK1Enum;
			lotushopper(d, function(val, R, RT) { switch(RT) {
				case 0x00: /* BOF */
					o.vers = val;
					if(val >= 0x1000) o.qpro = true;
					break;
				case 0xFF: /* BOF (works 3+) */
					o.vers = val;
					o.works = true;
					break;
				case 0x06: refguess = val; break; /* RANGE */
				case 0xCC: if(val) next_n = val; break; /* SHEETNAMECS */
				case 0xDE: next_n = val; break; /* SHEETNAMELP */
				case 0x0F: /* LABEL */
				case 0x33: /* STRING */
					if((!o.qpro && !o.works || RT == 0x33) && val[1].v.charCodeAt(0) < 0x30) val[1].v = val[1].v.slice(1);
					if(o.works || o.works2) val[1].v = val[1].v.replace(/\r\n/g, "\n");
					/* falls through */
				case 0x0D: /* INTEGER */
				case 0x0E: /* NUMBER */
				case 0x10: /* FORMULA */
					/* TODO: actual translation of the format code */
					if((val[2] & 0x70) == 0x70 && (val[2] & 0x0F) > 1 && (val[2] & 0x0F) < 15) {
						val[1].z = o.dateNF || LOTUS_DATE_FMTS[(val[2] & 0x0F)-1] || table_fmt[14];
						if(o.cellDates) { val[1].v = numdate(val[1].v); val[1].t = typeof val[1].v == "number" ? 'n' : 'd'; }
					}

					if(o.qpro) {
						if(val[3] > sidx) {
							s["!ref"] = encode_range(refguess);
							sheets[n] = s;
							snames.push(n);
							s = ({}/*:any*/); if(o.dense) sdata = s["!data"] = [];
							refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
							sidx = val[3]; n = next_n || "Sheet" + (sidx + 1); next_n = "";
						}
					}

					var tmpcell = o.dense ? (sdata[val[0].r]||[])[val[0].c] : s[encode_cell(val[0])];
					if(tmpcell) {
						tmpcell.t = val[1].t; tmpcell.v = val[1].v;
						if(val[1].z != null) tmpcell.z = val[1].z;
						if(val[1].f != null) tmpcell.f = val[1].f;
						lastcell = tmpcell;
						break;
					}
					if(o.dense) {
						if(!sdata[val[0].r]) sdata[val[0].r] = [];
						sdata[val[0].r][val[0].c] = val[1];
					} else s[encode_cell(val[0])] = val[1];
					lastcell = val[1];
					break;
				case 0x5405: o.works2 = true; break;
				case 0x5402: {
					/* TODO: enumerate all extended number formats */
					if(val == 0x14a1) {
						lastcell.z = "hh:mm:ss";
						if(o.cellDates && lastcell.t == "n") {
							lastcell.v = numdate(lastcell.v); lastcell.t = typeof lastcell.v == "number" ? 'n' : 'd';
						}
					}
				} break;
			}}, o);
		} else if(d[2] == 0x1A || d[2] == 0x0E) {
			o.Enum = WK3Enum;
			if(d[2] == 0x0E) { o.qpro = true; d.l = 0; }
			lotushopper(d, function(val, R, RT) { switch(RT) {
				case 0xCC: n = val; break; /* SHEETNAMECS */
				case 0x16: /* LABEL16 */
					if(val[1].v.charCodeAt(0) < 0x30) val[1].v = val[1].v.slice(1);
					// TODO: R9 appears to encode control codes this way -- verify against other versions
					val[1].v = val[1].v.replace(/\x0F./g, function($$) { return String.fromCharCode($$.charCodeAt(1) - 0x20); }).replace(/\r\n/g, "\n");
					/* falls through */
				case 0x17: /* NUMBER17 */
				case 0x18: /* NUMBER18 */
				case 0x19: /* FORMULA19 */
				case 0x25: /* NUMBER25 */
				case 0x27: /* NUMBER27 */
				case 0x28: /* FORMULA28 */
					if(val[3] > sidx) {
						s["!ref"] = encode_range(refguess);
						sheets[n] = s;
						snames.push(n);
						s = ({}/*:any*/); if(o.dense) sdata = s["!data"] = [];
						refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
						sidx = val[3]; n = "Sheet" + (sidx + 1);
					}
					if(sheetRows > 0 && val[0].r >= sheetRows) break;
					if(o.dense) {
						if(!sdata[val[0].r]) sdata[val[0].r] = [];
						sdata[val[0].r][val[0].c] = val[1];
					} else s[encode_cell(val[0])] = val[1];
					if(refguess.e.c < val[0].c) refguess.e.c = val[0].c;
					if(refguess.e.r < val[0].r) refguess.e.r = val[0].r;
					break;
				case 0x1B: /* XFORMAT */
					if(val[0x36b0]) realnames[val[0x36b0][0]] = val[0x36b0][1];
					break;
				case 0x0601: /* SHEETINFOQP */
					realnames[val[0]] = val[1]; if(val[0] == sidx) n = val[1]; break;
				default: break;
			}}, o);
		} else throw new Error("Unrecognized LOTUS BOF " + d[2]);
		s["!ref"] = encode_range(refguess);
		sheets[next_n || n] = s;
		snames.push(next_n || n);
		if(!realnames.length) return { SheetNames: snames, Sheets: sheets };
		var osheets = {}, rnames = [];
		/* TODO: verify no collisions */
		for(var i = 0; i < realnames.length; ++i) if(sheets[snames[i]]) {
			rnames.push(realnames[i] || snames[i]);
			osheets[realnames[i]] = sheets[realnames[i]] || sheets[snames[i]];
		} else {
			rnames.push(realnames[i]);
			osheets[realnames[i]] = ({ "!ref": "A1" });
		}
		return { SheetNames: rnames, Sheets: osheets };
	}

	function sheet_to_wk1(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
		var o = opts || {};
		if(+o.codepage >= 0) set_cp(+o.codepage);
		if(o.type == "string") throw new Error("Cannot write WK1 to JS string");
		var ba = buf_array();
		if(!ws["!ref"]) throw new Error("Cannot export empty sheet to WK1");
		var range = safe_decode_range(ws["!ref"]);
		var dense = ws["!data"] != null;
		var cols = [];

		write_biff_rec(ba, 0x00, write_BOF_WK1(0x0406));
		write_biff_rec(ba, 0x06, write_RANGE(range));
		var max_R = Math.min(range.e.r, 8191);
		for(var C = range.s.c; C <= range.e.c; ++C) cols[C] = encode_col(C);
		for(var R = range.s.r; R <= max_R; ++R) {
			var rr = encode_row(R);
			for(C = range.s.c; C <= range.e.c; ++C) {
				var cell = dense ? (ws["!data"][R]||[])[C] : ws[cols[C] + rr];
				if(!cell || cell.t == "z") continue;
				/* TODO: formula records */
				switch(cell.t) {
				case "n":
					if((cell.v|0)==cell.v && cell.v >= -32768 && cell.v <= 32767) write_biff_rec(ba, 0x0d, write_INTEGER(R, C, cell));
					else write_biff_rec(ba, 0x0e, write_NUMBER(R, C, cell));
					break;
				case "d":
					var dc = datenum(cell.v);
					if((dc|0)==dc && dc >= -32768 && dc <= 32767) write_biff_rec(ba, 0x0d, write_INTEGER(R, C, {t:"n", v:dc, z:cell.z || table_fmt[14]}));
					else write_biff_rec(ba, 0x0e, write_NUMBER(R, C, {t:"n", v:dc, z:cell.z || table_fmt[14]}));
					break;
				default:
					var str = format_cell(cell);
					write_biff_rec(ba, 0x0F, write_LABEL(R, C, str.slice(0, 239)));
				}
			}
		}

		write_biff_rec(ba, 0x01);
		return ba.end();
	}

	function book_to_wk3(wb/*:Workbook*/, opts/*:WriteOpts*/) {
		var o = opts || {};
		if(+o.codepage >= 0) set_cp(+o.codepage);
		if(o.type == "string") throw new Error("Cannot write WK3 to JS string");
		var ba = buf_array();

		write_biff_rec(ba, 0x00, write_BOF_WK3(wb));

		for(var i = 0, cnt = 0; i < wb.SheetNames.length; ++i) if((wb.Sheets[wb.SheetNames[i]] || {})["!ref"]) write_biff_rec(ba, 0x1b, write_XFORMAT_SHEETNAME(wb.SheetNames[i], cnt++));

		var wsidx = 0;
		for(i = 0; i < wb.SheetNames.length; ++i) {
			var ws = wb.Sheets[wb.SheetNames[i]];
			if(!ws || !ws["!ref"]) continue;
			var range = safe_decode_range(ws["!ref"]);
			var dense = ws["!data"] != null;
			var cols = [];
			var max_R = Math.min(range.e.r, 8191);
			for(var R = range.s.r; R <= max_R; ++R) {
				var rr = encode_row(R);
				for(var C = range.s.c; C <= range.e.c; ++C) {
					if(R === range.s.r) cols[C] = encode_col(C);
					var ref = cols[C] + rr;
					var cell = dense ? (ws["!data"][R]||[])[C] : ws[ref];
					if(!cell || cell.t == "z") continue;
					/* TODO: FORMULA19 NUMBER18 records */
					if(cell.t == "n") {
						write_biff_rec(ba, 0x17, write_NUMBER_17(R, C, wsidx, cell.v));
					} else {
						var str = format_cell(cell);
						/* TODO: max len? */
						write_biff_rec(ba, 0x16, write_LABEL_16(R, C, wsidx, str.slice(0, 239)));
					}
				}
			}
			++wsidx;
		}

		write_biff_rec(ba, 0x01);
		return ba.end();
	}


	function write_BOF_WK1(v/*:number*/) {
		var out = new_buf(2);
		out.write_shift(2, v);
		return out;
	}

	function write_BOF_WK3(wb/*:Workbook*/) {
		var out = new_buf(26);
		out.write_shift(2, 0x1000);
		out.write_shift(2, 0x0004);
		out.write_shift(4, 0x0000);
		var rows = 0, cols = 0, wscnt = 0;
		for(var i = 0; i < wb.SheetNames.length; ++i) {
			var name = wb.SheetNames[i];
			var ws = wb.Sheets[name];
			if(!ws || !ws["!ref"]) continue;
			++wscnt;
			var range = decode_range(ws["!ref"]);
			if(rows < range.e.r) rows = range.e.r;
			if(cols < range.e.c) cols = range.e.c;
		}
		if(rows > 8191) rows = 8191;
		out.write_shift(2, rows);
		out.write_shift(1, wscnt);
		out.write_shift(1, cols);
		out.write_shift(2, 0x00);
		out.write_shift(2, 0x00);
		out.write_shift(1, 0x01);
		out.write_shift(1, 0x02);
		out.write_shift(4, 0);
		out.write_shift(4, 0);
		return out;
	}

	function parse_RANGE(blob, length, opts) {
		var o = {s:{c:0,r:0},e:{c:0,r:0}};
		if(length == 8 && opts.qpro) {
			o.s.c = blob.read_shift(1);
			blob.l++;
			o.s.r = blob.read_shift(2);
			o.e.c = blob.read_shift(1);
			blob.l++;
			o.e.r = blob.read_shift(2);
			return o;
		}
		o.s.c = blob.read_shift(2);
		o.s.r = blob.read_shift(2);
		if(length == 12 && opts.qpro) blob.l += 2;
		o.e.c = blob.read_shift(2);
		o.e.r = blob.read_shift(2);
		if(length == 12 && opts.qpro) blob.l += 2;
		if(o.s.c == 0xFFFF) o.s.c = o.e.c = o.s.r = o.e.r = 0;
		return o;
	}
	function write_RANGE(range) {
		var out = new_buf(8);
		out.write_shift(2, range.s.c);
		out.write_shift(2, range.s.r);
		out.write_shift(2, range.e.c);
		out.write_shift(2, range.e.r);
		return out;
	}

	function parse_cell(blob, length, opts) {
		var o = [{c:0,r:0}, {t:'n',v:0}, 0, 0];
		if(opts.qpro && opts.vers != 0x5120) {
			o[0].c = blob.read_shift(1);
			o[3] = blob.read_shift(1);
			o[0].r = blob.read_shift(2);
			blob.l+=2;
		} else if(opts.works) { // TODO: verify with more complex works3-4 examples
			o[0].c = blob.read_shift(2); o[0].r = blob.read_shift(2);
			o[2] = blob.read_shift(2);
		} else {
			o[2] = blob.read_shift(1);
			o[0].c = blob.read_shift(2); o[0].r = blob.read_shift(2);
		}
		return o;
	}

	function get_wk1_fmt(cell)/*:number*/ {
		/* TODO: some fuzzy matching on the number format */
		if(cell.z && fmt_is_date(cell.z)) {
			return 0xf0 | (LOTUS_DATE_FMTS.indexOf(cell.z) + 1 || 2);
		}
		return 0xFF;
	}
	function parse_LABEL(blob, length, opts) {
		var tgt = blob.l + length;
		var o = parse_cell(blob, length, opts);
		o[1].t = 's';
		if((opts.vers & 0xFFFE) == 0x5120) { // WQ1 / WQ2
			blob.l++;
			var len = blob.read_shift(1);
			o[1].v = blob.read_shift(len, 'utf8');
			return o;
		}
		if(opts.qpro) blob.l++;
		o[1].v = blob.read_shift(tgt - blob.l, 'cstr');
		return o;
	}
	function write_LABEL(R, C, s) {
		/* TODO: encoding */
		var o = new_buf(7 + s.length);
		o.write_shift(1, 0xFF);
		o.write_shift(2, C);
		o.write_shift(2, R);
		o.write_shift(1, 0x27); // ??
		for(var i = 0; i < o.length; ++i) {
			var cc = s.charCodeAt(i);
			o.write_shift(1, cc >= 0x80 ? 0x5F : cc);
		}
		o.write_shift(1, 0);
		return o;
	}
	function parse_STRING(blob, length, opts) {
		var tgt = blob.l + length;
		var o = parse_cell(blob, length, opts);
		o[1].t = 's';
		if(opts.vers == 0x5120) {
			var len = blob.read_shift(1);
			o[1].v = blob.read_shift(len, 'utf8');
			return o;
		}
		o[1].v = blob.read_shift(tgt - blob.l, 'cstr');
		return o;
	}

	function parse_INTEGER(blob, length, opts) {
		var o = parse_cell(blob, length, opts);
		o[1].v = blob.read_shift(2, 'i');
		return o;
	}
	function write_INTEGER(R, C, cell) {
		var o = new_buf(7);
		o.write_shift(1, get_wk1_fmt(cell));
		o.write_shift(2, C);
		o.write_shift(2, R);
		o.write_shift(2, cell.v, 'i');
		return o;
	}

	function parse_NUMBER(blob, length, opts) {
		var o = parse_cell(blob, length, opts);
		o[1].v = blob.read_shift(8, 'f');
		return o;
	}
	function write_NUMBER(R, C, cell) {
		var o = new_buf(13);
		o.write_shift(1, get_wk1_fmt(cell));
		o.write_shift(2, C);
		o.write_shift(2, R);
		o.write_shift(8, cell.v, 'f');
		return o;
	}

	function parse_FORMULA(blob, length, opts) {
		var tgt = blob.l + length;
		var o = parse_cell(blob, length, opts);
		/* TODO: formula */
		o[1].v = blob.read_shift(8, 'f');
		if(opts.qpro) blob.l = tgt;
		else {
			var flen = blob.read_shift(2);
			wk1_fmla_to_csf(blob.slice(blob.l, blob.l + flen), o);
			blob.l += flen;
		}
		return o;
	}

	function wk1_parse_rc(B, V, col) {
		var rel = V & 0x8000;
		V &= ~0x8000;
		V = (rel ? B : 0) + ((V >= 0x2000) ? V - 0x4000 : V);
		return (rel ? "" : "$") + (col ? encode_col(V) : encode_row(V));
	}
	/* var oprec = [
		8, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 5, 5, 7, 3, 3,
		3, 3, 3, 3, 1, 1, 2, 6, 8, 8, 8, 8, 8, 8, 8, 8
	]; */
	/* TODO: flesh out */
	var FuncTab = {
		0x1F: ["NA", 0],
		// 0x20: ["ERR", 0],
		0x21: ["ABS", 1],
		0x22: ["TRUNC", 1],
		0x23: ["SQRT", 1],
		0x24: ["LOG", 1],
		0x25: ["LN", 1],
		0x26: ["PI", 0],
		0x27: ["SIN", 1],
		0x28: ["COS", 1],
		0x29: ["TAN", 1],
		0x2A: ["ATAN2", 2],
		0x2B: ["ATAN", 1],
		0x2C: ["ASIN", 1],
		0x2D: ["ACOS", 1],
		0x2E: ["EXP", 1],
		0x2F: ["MOD", 2],
		// 0x30
		0x31: ["ISNA", 1],
		0x32: ["ISERR", 1],
		0x33: ["FALSE", 0],
		0x34: ["TRUE", 0],
		0x35: ["RAND", 0],
		0x36: ["DATE", 3],
		// 0x37 NOW
		// 0x38 PMT
		// 0x39 PV
		// 0x3A FV
		// 0x3B IF
		// 0x3C DAY
		// 0x3D MONTH
		// 0x3E YEAR
		0x3F: ["ROUND", 2],
		0x40: ["TIME", 3],
		// 0x41 HOUR
		// 0x42 MINUTE
		// 0x43 SECOND
		0x44: ["ISNUMBER", 1],
		0x45: ["ISTEXT", 1],
		0x46: ["LEN", 1],
		0x47: ["VALUE", 1],
		// 0x48: ["FIXED", ?? 1],
		0x49: ["MID", 3],
		0x4A: ["CHAR", 1],
		// 0x4B
		// 0x4C FIND
		// 0x4D DATEVALUE
		// 0x4E TIMEVALUE
		// 0x4F CELL
		0x50: ["SUM", 69],
		0x51: ["AVERAGEA", 69],
		0x52: ["COUNTA", 69],
		0x53: ["MINA", 69],
		0x54: ["MAXA", 69],
		// 0x55 VLOOKUP
		// 0x56 NPV
		// 0x57 VAR
		// 0x58 STD
		// 0x59 IRR
		// 0x5A HLOOKUP
		// 0x5B DSUM
		// 0x5C DAVERAGE
		// 0x5D DCOUNTA
		// 0x5E DMIN
		// 0x5F DMAX
		// 0x60 DVARP
		// 0x61 DSTDEVP
		// 0x62 INDEX
		// 0x63 COLS
		// 0x64 ROWS
		// 0x65 REPEAT
		0x66: ["UPPER", 1],
		0x67: ["LOWER", 1],
		// 0x68 LEFT
		// 0x69 RIGHT
		// 0x6A REPLACE
		0x6B: ["PROPER", 1],
		// 0x6C CELL
		0x6D: ["TRIM", 1],
		// 0x6E CLEAN
		0x6F: ["T", 1]
		// 0x70 V
	};
	var BinOpTab = [
		  "",   "",   "",   "",   "",   "",   "",   "", // eslint-disable-line no-mixed-spaces-and-tabs
		  "",  "+",  "-",  "*",  "/",  "^",  "=", "<>", // eslint-disable-line no-mixed-spaces-and-tabs
		"<=", ">=",  "<",  ">",   "",   "",   "",   "", // eslint-disable-line no-mixed-spaces-and-tabs
		 "&",   "",   "",   "",   "",   "",   "",   ""  // eslint-disable-line no-mixed-spaces-and-tabs
	];

	function wk1_fmla_to_csf(blob, o) {
		prep_blob(blob, 0);
		var out = [], argc = 0, R = "", C = "", argL = "", argR = "";
		while(blob.l < blob.length) {
			var cc = blob[blob.l++];
			switch(cc) {
				case 0x00: out.push(blob.read_shift(8, 'f')); break;
				case 0x01: {
					C = wk1_parse_rc(o[0].c, blob.read_shift(2), true);
					R = wk1_parse_rc(o[0].r, blob.read_shift(2), false);
					out.push(C + R);
				} break;
				case 0x02: {
					var c = wk1_parse_rc(o[0].c, blob.read_shift(2), true);
					var r = wk1_parse_rc(o[0].r, blob.read_shift(2), false);
					C = wk1_parse_rc(o[0].c, blob.read_shift(2), true);
					R = wk1_parse_rc(o[0].r, blob.read_shift(2), false);
					out.push(c + r + ":" + C + R);
				} break;
				case 0x03:
					if(blob.l < blob.length) { console.error("WK1 premature formula end"); return; }
					break;
				case 0x04: out.push("(" + out.pop() + ")"); break;
				case 0x05: out.push(blob.read_shift(2)); break;
				case 0x06: {
					/* TODO: text encoding */
					var Z = ""; while((cc = blob[blob.l++])) Z += String.fromCharCode(cc);
					out.push('"' + Z.replace(/"/g, '""') + '"');
				} break;

				case 0x08: out.push("-" + out.pop()); break;
				case 0x17: out.push("+" + out.pop()); break;
				case 0x16: out.push("NOT(" + out.pop() + ")"); break;

				case 0x14: case 0x15: {
					argR = out.pop(); argL = out.pop();
					out.push(["AND", "OR"][cc - 0x14] + "(" + argL + "," + argR + ")");
				} break;

				default:
					if(cc < 0x20 && BinOpTab[cc]) {
						argR = out.pop(); argL = out.pop();
						out.push(argL + BinOpTab[cc] + argR);
					} else if(FuncTab[cc]) {
						argc = FuncTab[cc][1];
						if(argc == 69) argc = blob[blob.l++];
						if(argc > out.length) { console.error("WK1 bad formula parse 0x" + cc.toString(16) + ":|" + out.join("|") + "|"); return; }
						var args = out.slice(-argc);
						out.length -= argc;
						out.push(FuncTab[cc][0] + "(" + args.join(",") + ")");
					}
					else if(cc <= 0x07) return console.error("WK1 invalid opcode " + cc.toString(16));
					else if(cc <= 0x18) return console.error("WK1 unsupported op " + cc.toString(16));
					else if(cc <= 0x1E) return console.error("WK1 invalid opcode " + cc.toString(16));
					else if(cc <= 0x73) return console.error("WK1 unsupported function opcode " + cc.toString(16));
					// possible future functions ??
					else return console.error("WK1 unrecognized opcode " + cc.toString(16));
			}
		}
		if(out.length == 1) o[1].f = "" + out[0];
		else console.error("WK1 bad formula parse |" + out.join("|") + "|");
	}


	function parse_cell_3(blob/*::, length*/) {
		var o = [{c:0,r:0}, {t:'n',v:0}, 0];
		o[0].r = blob.read_shift(2); o[3] = blob[blob.l++]; o[0].c = blob[blob.l++];
		return o;
	}

	function parse_LABEL_16(blob, length) {
		var o = parse_cell_3(blob, length);
		o[1].t = 's';
		o[1].v = blob.read_shift(length - 4, 'cstr');
		return o;
	}
	function write_LABEL_16(R, C, wsidx, s) {
		/* TODO: encoding */
		var o = new_buf(6 + s.length);
		o.write_shift(2, R);
		o.write_shift(1, wsidx);
		o.write_shift(1, C);
		o.write_shift(1, 0x27);
		for(var i = 0; i < s.length; ++i) {
			var cc = s.charCodeAt(i);
			o.write_shift(1, cc >= 0x80 ? 0x5F : cc);
		}
		o.write_shift(1, 0);
		return o;
	}

	function parse_NUMBER_18(blob, length) {
		var o = parse_cell_3(blob, length);
		o[1].v = blob.read_shift(2);
		var v = o[1].v >> 1;
		if(o[1].v & 0x1) {
			switch(v & 0x07) {
				case 0: v = (v >> 3) * 5000; break;
				case 1: v = (v >> 3) * 500; break;
				case 2: v = (v >> 3) / 20; break;
				case 3: v = (v >> 3) / 200; break;
				case 4: v = (v >> 3) / 2000; break;
				case 5: v = (v >> 3) / 20000; break;
				case 6: v = (v >> 3) / 16; break;
				case 7: v = (v >> 3) / 64; break;
			}
		}
		o[1].v = v;
		return o;
	}

	function parse_NUMBER_17(blob, length) {
		var o = parse_cell_3(blob, length);
		var v1 = blob.read_shift(4);
		var v2 = blob.read_shift(4);
		var e = blob.read_shift(2);
		if(e == 0xFFFF) {
			if(v1 === 0 && v2 === 0xC0000000) { o[1].t = "e"; o[1].v = 0x0F; } // ERR -> #VALUE!
			else if(v1 === 0 && v2 === 0xD0000000) { o[1].t = "e"; o[1].v = 0x2A; } // NA -> #N/A
			else o[1].v = 0;
			return o;
		}
		var s = e & 0x8000; e = (e&0x7FFF) - 16446;
		o[1].v = (1 - s*2) * (v2 * Math.pow(2, e+32) + v1 * Math.pow(2, e));
		return o;
	}
	function write_NUMBER_17(R, C, wsidx, v) {
		var o = new_buf(14);
		o.write_shift(2, R);
		o.write_shift(1, wsidx);
		o.write_shift(1, C);
		if(v == 0) {
			o.write_shift(4, 0);
			o.write_shift(4, 0);
			o.write_shift(2, 0xFFFF);
			return o;
		}
		var s = 0, e = 0, v1 = 0, v2 = 0;
		if(v < 0) { s = 1; v = -v; }
		e = Math.log2(v) | 0;
		v /= Math.pow(2, e-31);
		v2 = (v)>>>0;
		if((v2&0x80000000) == 0) { v/=2; ++e; v2 = v >>> 0; }
		v -= v2;
		v2 |= 0x80000000;
		v2 >>>= 0;
		v *= Math.pow(2, 32);
		v1 = v>>>0;
		o.write_shift(4, v1);
		o.write_shift(4, v2);
		e += 0x3FFF + (s ? 0x8000 : 0);
		o.write_shift(2, e);
		return o;
	}

	function parse_FORMULA_19(blob, length) {
		var o = parse_NUMBER_17(blob, 14);
		blob.l += length - 14; /* TODO: WK3 formula */
		return o;
	}

	function parse_NUMBER_25(blob, length) {
		var o = parse_cell_3(blob, length);
		var v1 = blob.read_shift(4);
		o[1].v = v1 >> 6;
		return o;
	}

	function parse_NUMBER_27(blob, length) {
		var o = parse_cell_3(blob, length);
		var v1 = blob.read_shift(8,'f');
		o[1].v = v1;
		return o;
	}

	function parse_FORMULA_28(blob, length) {
		var o = parse_NUMBER_27(blob, 12);
		blob.l += length - 12; /* TODO: formula */
		return o;
	}

	function parse_SHEETNAMECS(blob, length) {
		return blob[blob.l + length - 1] == 0 ? blob.read_shift(length, 'cstr') : "";
	}

	function parse_SHEETNAMELP(blob, length) {
		var len = blob[blob.l++];
		if(len > length - 1) len = length - 1;
		var o = ""; while(o.length < len) o += String.fromCharCode(blob[blob.l++]);
		return o;
	}

	function parse_SHEETINFOQP(blob, length, opts) {
		if(!opts.qpro || length < 21) return;
		var id = blob.read_shift(1);
		blob.l += 17;
		blob.l += 1; //var len = blob.read_shift(1);
		blob.l += 2;
		var nm = blob.read_shift(length - 21, 'cstr');
		return [id, nm];
	}

	function parse_XFORMAT(blob, length) {
		var o = {}, tgt = blob.l + length;
		while(blob.l < tgt) {
			var dt = blob.read_shift(2);
			if(dt == 0x36b0) {
				o[dt] = [0, ""];
				o[dt][0] = blob.read_shift(2);
				while(blob[blob.l]) { o[dt][1] += String.fromCharCode(blob[blob.l]); blob.l++; } blob.l++;
			}
			// TODO: 0x3a99 ??
		}
		return o;
	}
	function write_XFORMAT_SHEETNAME(name, wsidx) {
		var out = new_buf(5 + name.length);
		out.write_shift(2, 0x36b0);
		out.write_shift(2, wsidx);
		for(var i = 0; i < name.length; ++i) {
			var cc = name.charCodeAt(i);
			out[out.l++] = cc > 0x7F ? 0x5F : cc;
		}
		out[out.l++] = 0;
		return out;
	}

	var WK1Enum = {
		0x0000: { n:"BOF", f:parseuint16 },
		0x0001: { n:"EOF" },
		0x0002: { n:"CALCMODE" },
		0x0003: { n:"CALCORDER" },
		0x0004: { n:"SPLIT" },
		0x0005: { n:"SYNC" },
		0x0006: { n:"RANGE", f:parse_RANGE },
		0x0007: { n:"WINDOW1" },
		0x0008: { n:"COLW1" },
		0x0009: { n:"WINTWO" },
		0x000A: { n:"COLW2" },
		0x000B: { n:"NAME" },
		0x000C: { n:"BLANK" },
		0x000D: { n:"INTEGER", f:parse_INTEGER },
		0x000E: { n:"NUMBER", f:parse_NUMBER },
		0x000F: { n:"LABEL", f:parse_LABEL },
		0x0010: { n:"FORMULA", f:parse_FORMULA },
		0x0018: { n:"TABLE" },
		0x0019: { n:"ORANGE" },
		0x001A: { n:"PRANGE" },
		0x001B: { n:"SRANGE" },
		0x001C: { n:"FRANGE" },
		0x001D: { n:"KRANGE1" },
		0x0020: { n:"HRANGE" },
		0x0023: { n:"KRANGE2" },
		0x0024: { n:"PROTEC" },
		0x0025: { n:"FOOTER" },
		0x0026: { n:"HEADER" },
		0x0027: { n:"SETUP" },
		0x0028: { n:"MARGINS" },
		0x0029: { n:"LABELFMT" },
		0x002A: { n:"TITLES" },
		0x002B: { n:"SHEETJS" },
		0x002D: { n:"GRAPH" },
		0x002E: { n:"NGRAPH" },
		0x002F: { n:"CALCCOUNT" },
		0x0030: { n:"UNFORMATTED" },
		0x0031: { n:"CURSORW12" },
		0x0032: { n:"WINDOW" },
		0x0033: { n:"STRING", f:parse_STRING },
		0x0037: { n:"PASSWORD" },
		0x0038: { n:"LOCKED" },
		0x003C: { n:"QUERY" },
		0x003D: { n:"QUERYNAME" },
		0x003E: { n:"PRINT" },
		0x003F: { n:"PRINTNAME" },
		0x0040: { n:"GRAPH2" },
		0x0041: { n:"GRAPHNAME" },
		0x0042: { n:"ZOOM" },
		0x0043: { n:"SYMSPLIT" },
		0x0044: { n:"NSROWS" },
		0x0045: { n:"NSCOLS" },
		0x0046: { n:"RULER" },
		0x0047: { n:"NNAME" },
		0x0048: { n:"ACOMM" },
		0x0049: { n:"AMACRO" },
		0x004A: { n:"PARSE" },
		// 0x0064
		0x0066: { n:"PRANGES??" },
		0x0067: { n:"RRANGES??" },
		0x0068: { n:"FNAME??" },
		0x0069: { n:"MRANGES??" },
		// 0x0096
		// 0x0099
		// 0x009A
		// 0x009B
		// 0x009C
		// 0x00C0
		// 0x00C7
		// 0x00C9
		0x00CC: { n:"SHEETNAMECS", f:parse_SHEETNAMECS },
		// 0x00CD
		0x00DE: { n:"SHEETNAMELP", f:parse_SHEETNAMELP },
		0x00FF: { n:"BOF", f:parseuint16 },
		0x5402: { n:"WKSNF", f:parseuint16 },
		0xFFFF: { n:"" }
	};

	var WK3Enum = {
		0x0000: { n:"BOF" },
		0x0001: { n:"EOF" },
		0x0002: { n:"PASSWORD" },
		0x0003: { n:"CALCSET" },
		0x0004: { n:"WINDOWSET" },
		0x0005: { n:"SHEETCELLPTR" },
		0x0006: { n:"SHEETLAYOUT" },
		0x0007: { n:"COLUMNWIDTH" },
		0x0008: { n:"HIDDENCOLUMN" },
		0x0009: { n:"USERRANGE" },
		0x000A: { n:"SYSTEMRANGE" },
		0x000B: { n:"ZEROFORCE" },
		0x000C: { n:"SORTKEYDIR" },
		0x000D: { n:"FILESEAL" },
		0x000E: { n:"DATAFILLNUMS" },
		0x000F: { n:"PRINTMAIN" },
		0x0010: { n:"PRINTSTRING" },
		0x0011: { n:"GRAPHMAIN" },
		0x0012: { n:"GRAPHSTRING" },
		0x0013: { n:"??" },
		0x0014: { n:"ERRCELL" },
		0x0015: { n:"NACELL" },
		0x0016: { n:"LABEL16", f:parse_LABEL_16},
		0x0017: { n:"NUMBER17", f:parse_NUMBER_17 },
		0x0018: { n:"NUMBER18", f:parse_NUMBER_18 },
		0x0019: { n:"FORMULA19", f:parse_FORMULA_19},
		0x001A: { n:"FORMULA1A" },
		0x001B: { n:"XFORMAT", f:parse_XFORMAT },
		0x001C: { n:"DTLABELMISC" },
		0x001D: { n:"DTLABELCELL" },
		0x001E: { n:"GRAPHWINDOW" },
		0x001F: { n:"CPA" },
		0x0020: { n:"LPLAUTO" },
		0x0021: { n:"QUERY" },
		0x0022: { n:"HIDDENSHEET" },
		0x0023: { n:"??" },
		0x0025: { n:"NUMBER25", f:parse_NUMBER_25 },
		0x0026: { n:"??" },
		0x0027: { n:"NUMBER27", f:parse_NUMBER_27 },
		0x0028: { n:"FORMULA28", f:parse_FORMULA_28 },
		0x008E: { n:"??" },
		0x0093: { n:"??" },
		0x0096: { n:"??" },
		0x0097: { n:"??" },
		0x0098: { n:"??" },
		0x0099: { n:"??" },
		0x009A: { n:"??" },
		0x009B: { n:"??" },
		0x009C: { n:"??" },
		0x00A3: { n:"??" },
		0x00AE: { n:"??" },
		0x00AF: { n:"??" },
		0x00B0: { n:"??" },
		0x00B1: { n:"??" },
		0x00B8: { n:"??" },
		0x00B9: { n:"??" },
		0x00BA: { n:"??" },
		0x00BB: { n:"??" },
		0x00BC: { n:"??" },
		0x00C3: { n:"??" },
		0x00C9: { n:"??" },
		0x00CC: { n:"SHEETNAMECS", f:parse_SHEETNAMECS },
		0x00CD: { n:"??" },
		0x00CE: { n:"??" },
		0x00CF: { n:"??" },
		0x00D0: { n:"??" },
		0x0100: { n:"??" },
		0x0103: { n:"??" },
		0x0104: { n:"??" },
		0x0105: { n:"??" },
		0x0106: { n:"??" },
		0x0107: { n:"??" },
		0x0109: { n:"??" },
		0x010A: { n:"??" },
		0x010B: { n:"??" },
		0x010C: { n:"??" },
		0x010E: { n:"??" },
		0x010F: { n:"??" },
		0x0180: { n:"??" },
		0x0185: { n:"??" },
		0x0186: { n:"??" },
		0x0189: { n:"??" },
		0x018C: { n:"??" },
		0x0200: { n:"??" },
		0x0202: { n:"??" },
		0x0201: { n:"??" },
		0x0204: { n:"??" },
		0x0205: { n:"??" },
		0x0280: { n:"??" },
		0x0281: { n:"??" },
		0x0282: { n:"??" },
		0x0283: { n:"??" },
		0x0284: { n:"??" },
		0x0285: { n:"??" },
		0x0286: { n:"??" },
		0x0287: { n:"??" },
		0x0288: { n:"??" },
		0x0292: { n:"??" },
		0x0293: { n:"??" },
		0x0294: { n:"??" },
		0x0295: { n:"??" },
		0x0296: { n:"??" },
		0x0299: { n:"??" },
		0x029A: { n:"??" },
		0x0300: { n:"??" },
		0x0304: { n:"??" },
		0x0601: { n:"SHEETINFOQP", f:parse_SHEETINFOQP },
		0x0640: { n:"??" },
		0x0642: { n:"??" },
		0x0701: { n:"??" },
		0x0702: { n:"??" },
		0x0703: { n:"??" },
		0x0704: { n:"??" },
		0x0780: { n:"??" },
		0x0800: { n:"??" },
		0x0801: { n:"??" },
		0x0804: { n:"??" },
		0x0A80: { n:"??" },
		0x2AF6: { n:"??" },
		0x3231: { n:"??" },
		0x6E49: { n:"??" },
		0x6F44: { n:"??" },
		0xFFFF: { n:"" }
	};

	/* TODO: fill out and verify this table across QP versions */
	var QPWNFTable = {
		0x05: "dd-mmm-yy",
		0x06: "dd-mmm",
		0x07: "mmm-yy",
		0x08: "mm/dd/yy", // Long Date Intl
		0x0A: "hh:mm:ss AM/PM",
		0x0B: "hh:mm AM/PM",
		0x0E: "dd-mmm-yyyy",
		0x0F: "mmm-yyyy",

		/* It is suspected that the the low nybble specifies decimal places */
		0x0022: "0.00",
		0x0032: "0.00;[Red]0.00",
		0x0042: "0.00;\(0.00\)",
		0x0052: "0.00;[Red]\(0.00\)",
		0x00A2: '"$"#,##0.00;\\("$"#,##0.00\\)',
		0x0120: '0%',
		0x0130: '0E+00',
		0x0140: '# ?/?'
	};

	function parse_qpw_str(p) {
		var cch = p.read_shift(2);
		var flags = p.read_shift(1);
		/* TODO: find examples with nonzero flags */
		if(flags != 0) throw "unsupported QPW string type " + flags.toString(16);
		return p.read_shift(cch, "sbcs-cont");
	}

	/* QPW uses a different set of record types */
	function qpw_to_workbook_buf(d, opts)/*:Workbook*/ {
		prep_blob(d, 0);
		var o = opts || {};
		if(DENSE != null && o.dense == null) o.dense = DENSE;
		var s/*:Worksheet*/ = ({}/*:any*/); if(o.dense) s["!data"] = [];
		var SST = [], sname = "", formulae = [];
		var range = {s:{r:-1,c:-1}, e:{r:-1,c:-1}};
		var cnt = 0, type = 0, C = 0, R = 0;
		var wb = { SheetNames: [], Sheets: {} };
		var FMTS = [];
		outer: while(d.l < d.length) {
			var RT = d.read_shift(2), length = d.read_shift(2);
			var p = d.slice(d.l, d.l + length);
			prep_blob(p, 0);
			switch(RT) {
				case 0x01: /* BOF */
					if(p.read_shift(4) != 0x39575051) throw "Bad QPW9 BOF!";
					break;
				case 0x02: /* EOF */ break outer;

				case 0x08: /* NF */ break; // TODO: this is tied to custom number formats

				case 0x0A: /* FORMATS */ {
					var fcnt = p.read_shift(4);
					var step = ((p.length - p.l)/ fcnt)|0;
					for(var ifmt = 0; ifmt < fcnt; ++ifmt) {
						var end = p.l + step;
						var fmt = {};
						p.l += 2;
						fmt.numFmtId = p.read_shift(2);
						if(QPWNFTable[fmt.numFmtId]) fmt.z = QPWNFTable[fmt.numFmtId];
						p.l = end;
						FMTS.push(fmt);
					}
				} break;

				/* TODO: The behavior here should be consistent with Numbers: QP Notebook ~ .TN.SheetArchive, QP Sheet ~ .TST.TableModelArchive */
				case 0x0401: /* BON */ break;
				case 0x0402: /* EON */ /* TODO: backfill missing sheets based on BON cnt */ break;

				case 0x0407: { /* SST */
					p.l += 12;
					while(p.l < p.length) {
						cnt = p.read_shift(2);
						type = p.read_shift(1);
						SST.push(p.read_shift(cnt, 'cstr'));
					}
				} break;
				case 0x0408: { /* FORMULAE */
					//p.l += 12;
					//while(p.l < p.length) {
					//	cnt = p.read_shift(2);
					//	formulae.push(p.slice(p.l, p.l + cnt + 1)); p.l += cnt + 1;
					//}
				} break;

				case 0x0601: { /* BOS */
					var sidx = p.read_shift(2);
					s = ({}/*:any*/); if(o.dense) s["!data"] = [];
					range.s.c = p.read_shift(2);
					range.e.c = p.read_shift(2);
					range.s.r = p.read_shift(4);
					range.e.r = p.read_shift(4);
					p.l += 4;
					if(p.l + 2 < p.length) {
						cnt = p.read_shift(2);
						type = p.read_shift(1);
						sname = cnt == 0 ? "" : p.read_shift(cnt, 'cstr');
					}
					if(!sname) sname = encode_col(sidx);
					/* TODO: backfill empty sheets */
				} break;
				case 0x0602: { /* EOS */
					/* NOTE: QP valid range A1:IV1000000 */
					if(range.s.c > 0xFF || range.s.r > 999999) break;
					if(range.e.c < range.s.c) range.e.c = range.s.c;
					if(range.e.r < range.s.r) range.e.r = range.s.r;
					s["!ref"] = encode_range(range);
					book_append_sheet(wb, s, sname); // TODO: a barrel roll
				} break;

				case 0x0A01: { /* COL (like XLS Row, modulo the layout transposition) */
					C = p.read_shift(2);
					if(range.e.c < C) range.e.c = C;
					if(range.s.c > C) range.s.c = C;
					R = p.read_shift(4);
					if(range.s.r > R) range.s.r = R;
					R = p.read_shift(4);
					if(range.e.r < R) range.e.r = R;
				} break;

				case 0x0C01: { /* MulCells (like XLS MulRK, but takes advantage of common column data patterns) */
					R = p.read_shift(4), cnt = p.read_shift(4);
					if(range.s.r > R) range.s.r = R;
					if(range.e.r < R + cnt - 1) range.e.r = R + cnt - 1;
					var CC = encode_col(C);
					while(p.l < p.length) {
						var cell = { t: "z" };
						var flags = p.read_shift(1), fmtidx = -1;
						if(flags & 0x80) fmtidx = p.read_shift(2);
						var mul = (flags & 0x40) ? p.read_shift(2) - 1: 0;
						switch(flags & 0x1F) {
							case 0: break;
							case 1: break;
							case 2: cell = { t: "n", v: p.read_shift(2) }; break;
							case 3: cell = { t: "n", v: p.read_shift(2, 'i') }; break;
							case 4: cell = { t: "n", v: parse_RkNumber(p) }; break;
							case 5: cell = { t: "n", v: p.read_shift(8, 'f') }; break;
							case 7: cell = { t: "s", v: SST[type = p.read_shift(4) - 1] }; break;
							case 8:
								cell = { t: "n", v: p.read_shift(8, 'f') };
								p.l += 2; /* cell.f = formulae[p.read_shift(4)]; */ p.l += 4;
								if(isNaN(cell.v)) cell = { t: "e", v: 0x0F }; // #VALUE!
								break;
							default: throw "Unrecognized QPW cell type " + (flags & 0x1F);
						}
						if(fmtidx != -1 && (FMTS[fmtidx - 1]||{}).z) cell.z = FMTS[fmtidx-1].z;
						var delta = 0;
						if(flags & 0x20) switch(flags & 0x1F) {
							case 2: delta = p.read_shift(2); break;
							case 3: delta = p.read_shift(2, 'i'); break;
							case 7: delta = p.read_shift(2); break;
							default: throw "Unsupported delta for QPW cell type " + (flags & 0x1F);
						}
						if(!(!o.sheetStubs && cell.t == "z")) {
							var newcell = dup(cell);
							if(cell.t == "n" && cell.z && fmt_is_date(cell.z) && o.cellDates) {
								newcell.v = numdate(cell.v); newcell.t = typeof newcell.v == "number" ? 'n' : 'd';
							}
							if(s["!data"] != null) {
								if(!s["!data"][R]) s["!data"][R] = [];
								s["!data"][R][C] = newcell;
							} else s[CC + encode_row(R)] = newcell;
						}
						++R; --cnt;
						while(mul-- > 0 && cnt >= 0) {
							if(flags & 0x20) switch(flags & 0x1F) {
								case 2: cell = { t: "n", v: (cell.v + delta) & 0xFFFF }; break;
								case 3: cell = { t: "n", v: (cell.v + delta) & 0xFFFF }; if(cell.v > 0x7FFF) cell.v -= 0x10000; break;
								case 7: cell = { t: "s", v: SST[type = (type + delta) >>> 0] }; break;
								default: throw "Cannot apply delta for QPW cell type " + (flags & 0x1F);
							} else switch(flags & 0x1F) {
								case 1: cell = { t: "z" }; break;
								case 2: cell = { t: "n", v: p.read_shift(2) }; break;
								case 7: cell = { t: "s", v: SST[type = p.read_shift(4) - 1] }; break;
								default: throw "Cannot apply repeat for QPW cell type " + (flags & 0x1F);
							}
							if(fmtidx != -1);
							if(!(!o.sheetStubs && cell.t == "z")) {
								if(s["!data"] != null) {
									if(!s["!data"][R]) s["!data"][R] = [];
									s["!data"][R][C] = cell;
								} else s[CC + encode_row(R)] = cell;
							}
							++R; --cnt;
						}
					}
				} break;

				case 0x0C02: { /* String (result of string formula expression) */
					C = p.read_shift(2);
					R = p.read_shift(4);
					var str = parse_qpw_str(p);
					/* TODO: QP10 record has an additional unknown character after the string */
					if(s["!data"] != null) {
						if(!s["!data"][R]) s["!data"][R] = [];
						s["!data"][R][C] = { t:"s", v:str };
					} else s[encode_col(C) + encode_row(R)] = { t:"s", v:str };
				} break;

				default: break;
			}
			d.l += length;
		}
		return wb;
	}

	return {
		sheet_to_wk1: sheet_to_wk1,
		book_to_wk3: book_to_wk3,
		to_workbook: lotus_to_workbook
	};
})();