forked from sheetjs/sheetjs
536 lines
18 KiB
TypeScript
536 lines
18 KiB
TypeScript
/*! sheetjs (C) 2013-present SheetJS -- http://sheetjs.com */
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/// <reference path="src/types.ts"/>
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import { CFB$Container } from 'cfb';
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import { WorkBook, WorkSheet, Range, CellObject } from '../';
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import type { utils } from "../";
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declare var encode_cell: typeof utils.encode_cell;
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declare var encode_range: typeof utils.encode_range;
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declare var book_new: typeof utils.book_new;
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declare var book_append_sheet: typeof utils.book_append_sheet;
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var u8_to_dataview = (array: Uint8Array): DataView => new DataView(array.buffer, array.byteOffset, array.byteLength);
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var u8str = (u8: Uint8Array): string => /* Buffer.isBuffer(u8) ? u8.toString() :*/ typeof TextDecoder != "undefined" ? new TextDecoder().decode(u8) : utf8read(a2s(u8));
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var u8concat = (u8a: Uint8Array[]): Uint8Array => {
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var len = u8a.reduce((acc: number, x: Uint8Array) => acc + x.length, 0);
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var out = new Uint8Array(len);
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var off = 0;
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u8a.forEach(u8 => { out.set(u8, off); off += u8.length; });
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return out;
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};
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/* Hopefully one day this will be added to the language */
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var popcnt = (x: number): number => {
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x -= ((x >> 1) & 0x55555555);
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x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
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return (((x + (x >> 4)) & 0x0F0F0F0F) * 0x01010101) >>> 24;
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};
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/* Used in the modern cell storage */
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var readDecimal128LE = (buf: Uint8Array, offset: number): number => {
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var exp = ((buf[offset + 15] & 0x7F) << 7) | (buf[offset + 14] >> 1);
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var mantissa = buf[offset + 14] & 1;
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for(var j = offset + 13; j >= offset; --j) mantissa = mantissa * 256 + buf[j];
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return ((buf[offset+15] & 0x80) ? -mantissa : mantissa) * Math.pow(10, exp - 0x1820);
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};
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type Ptr = [number];
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/** Parse an integer from the varint that can be exactly stored in a double */
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function parse_varint49(buf: Uint8Array, ptr?: Ptr): number {
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var l = ptr ? ptr[0] : 0;
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var usz = buf[l] & 0x7F;
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varint: if(buf[l++] >= 0x80) {
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usz |= (buf[l] & 0x7F) << 7; if(buf[l++] < 0x80) break varint;
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usz |= (buf[l] & 0x7F) << 14; if(buf[l++] < 0x80) break varint;
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usz |= (buf[l] & 0x7F) << 21; if(buf[l++] < 0x80) break varint;
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usz += (buf[l] & 0x7F) * Math.pow(2, 28); ++l; if(buf[l++] < 0x80) break varint;
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usz += (buf[l] & 0x7F) * Math.pow(2, 35); ++l; if(buf[l++] < 0x80) break varint;
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usz += (buf[l] & 0x7F) * Math.pow(2, 42); ++l; if(buf[l++] < 0x80) break varint;
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}
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if(ptr) ptr[0] = l;
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return usz;
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}
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/*
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function write_varint49(v: number): Uint8Array {
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var usz = new Uint8Array(7);
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usz[0] = (v & 0x7F);
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var L = 1;
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sz: if(v > 0x7F) {
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usz[L-1] |= 0x80; usz[L] = (v >> 7) & 0x7F; ++L;
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if(v <= 0x3FFF) break sz;
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usz[L-1] |= 0x80; usz[L] = (v >> 14) & 0x7F; ++L;
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if(v <= 0x1FFFFF) break sz;
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usz[L-1] |= 0x80; usz[L] = (v >> 21) & 0x7F; ++L;
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if(v <= 0xFFFFFFF) break sz;
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usz[L-1] |= 0x80; usz[L] = ((v/0x100) >>> 21) & 0x7F; ++L;
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if(v <= 0x7FFFFFFFF) break sz;
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usz[L-1] |= 0x80; usz[L] = ((v/0x10000) >>> 21) & 0x7F; ++L;
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if(v <= 0x3FFFFFFFFFF) break sz;
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usz[L-1] |= 0x80; usz[L] = ((v/0x1000000) >>> 21) & 0x7F; ++L;
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}
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return usz.slice(0, L);
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}
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*/
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/** Parse a 32-bit signed integer from the raw varint */
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function varint_to_i32(buf: Uint8Array): number {
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var l = 0, i32 = buf[l] & 0x7F;
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varint: if(buf[l++] >= 0x80) {
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i32 |= (buf[l] & 0x7F) << 7; if(buf[l++] < 0x80) break varint;
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i32 |= (buf[l] & 0x7F) << 14; if(buf[l++] < 0x80) break varint;
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i32 |= (buf[l] & 0x7F) << 21; if(buf[l++] < 0x80) break varint;
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i32 |= (buf[l] & 0x7F) << 28;
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}
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return i32;
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}
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interface ProtoItem {
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offset?: number;
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data: Uint8Array;
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type: number;
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}
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type ProtoField = Array<ProtoItem>
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type ProtoMessage = Array<ProtoField>;
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/** Shallow parse of a message */
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function parse_shallow(buf: Uint8Array): ProtoMessage {
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var out: ProtoMessage = [], ptr: Ptr = [0];
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while(ptr[0] < buf.length) {
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var off = ptr[0];
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var num = parse_varint49(buf, ptr);
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var type = num & 0x07; num = Math.floor(num / 8);
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var len = 0;
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var res: Uint8Array;
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if(num == 0) break;
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switch(type) {
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case 0: {
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var l = ptr[0];
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while(buf[ptr[0]++] >= 0x80);
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res = buf.slice(l, ptr[0]);
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} break;
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case 5: len = 4; res = buf.slice(ptr[0], ptr[0] + len); ptr[0] += len; break;
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case 1: len = 8; res = buf.slice(ptr[0], ptr[0] + len); ptr[0] += len; break;
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case 2: len = parse_varint49(buf, ptr); res = buf.slice(ptr[0], ptr[0] + len); ptr[0] += len; break;
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case 3: // Start group
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case 4: // End group
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default: throw new Error(`PB Type ${type} for Field ${num} at offset ${off}`);
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}
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var v: ProtoItem = { offset: off, data: res, type };
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if(out[num] == null) out[num] = [v];
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else out[num].push(v);
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}
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return out;
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}
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/** Serialize a shallow parse */
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/*
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function write_shallow(proto: ProtoMessage): Uint8Array {
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var out: Uint8Array[] = [];
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proto.forEach((field, idx) => {
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field.forEach(item => {
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out.push(write_varint49(idx * 8 + item.type));
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out.push(item.data);
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});
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});
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return u8concat(out);
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}
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*/
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function mappa<U>(data: ProtoField, cb:(Uint8Array) => U): U[] {
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if(!data) return [];
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return data.map((d) => { try {
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return cb(d.data);
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} catch(e) {
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var m = e.message?.match(/at offset (\d+)/);
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if(m) e.message = e.message.replace(/at offset (\d+)/, "at offset " + (+m[1] + d.offset));
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throw e;
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}});
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}
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interface IWAMessage {
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/** Metadata in .TSP.MessageInfo */
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meta: ProtoMessage;
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data: Uint8Array;
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}
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interface IWAArchiveInfo {
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id?: number;
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messages?: IWAMessage[];
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}
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function parse_iwa_file(buf: Uint8Array): IWAArchiveInfo[] {
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var out: IWAArchiveInfo[] = [], ptr: Ptr = [0];
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while(ptr[0] < buf.length) {
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/* .TSP.ArchiveInfo */
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var len = parse_varint49(buf, ptr);
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var ai = parse_shallow(buf.slice(ptr[0], ptr[0] + len));
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ptr[0] += len;
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var res: IWAArchiveInfo = {
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id: varint_to_i32(ai[1][0].data),
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messages: []
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};
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ai[2].forEach(b => {
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var mi = parse_shallow(b.data);
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var fl = varint_to_i32(mi[3][0].data);
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res.messages.push({
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meta: mi,
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data: buf.slice(ptr[0], ptr[0] + fl)
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});
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ptr[0] += fl;
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});
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out.push(res);
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}
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return out;
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}
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function parse_snappy_chunk(type: number, buf: Uint8Array): Uint8Array {
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if(type != 0) throw new Error(`Unexpected Snappy chunk type ${type}`);
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var ptr: Ptr = [0];
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var usz = parse_varint49(buf, ptr);
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var chunks = [];
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while(ptr[0] < buf.length) {
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var tag = buf[ptr[0]] & 0x3;
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if(tag == 0) {
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var len = buf[ptr[0]++] >> 2;
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if(len < 60) ++len;
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else {
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var c = len - 59;
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len = buf[ptr[0]];
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if(c > 1) len |= (buf[ptr[0]+1]<<8);
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if(c > 2) len |= (buf[ptr[0]+2]<<16);
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if(c > 3) len |= (buf[ptr[0]+3]<<24);
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len >>>=0; len++;
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ptr[0] += c;
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}
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chunks.push(buf.slice(ptr[0], ptr[0] + len)); ptr[0] += len; continue;
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} else {
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var offset = 0, length = 0;
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if(tag == 1) {
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length = ((buf[ptr[0]] >> 2) & 0x7) + 4;
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offset = (buf[ptr[0]++] & 0xE0) << 3;
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offset |= buf[ptr[0]++];
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} else {
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length = (buf[ptr[0]++] >> 2) + 1;
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if(tag == 2) { offset = buf[ptr[0]] | (buf[ptr[0]+1]<<8); ptr[0] += 2; }
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else { offset = (buf[ptr[0]] | (buf[ptr[0]+1]<<8) | (buf[ptr[0]+2]<<16) | (buf[ptr[0]+3]<<24))>>>0; ptr[0] += 4; }
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}
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chunks = [u8concat(chunks)];
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if(offset == 0) throw new Error("Invalid offset 0");
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if(offset > chunks[0].length) throw new Error("Invalid offset beyond length");
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if(length >= offset) {
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chunks.push(chunks[0].slice(-offset)); length -= offset;
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while(length >= chunks[chunks.length-1].length) {
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chunks.push(chunks[chunks.length - 1]);
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length -= chunks[chunks.length - 1].length;
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}
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}
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chunks.push(chunks[0].slice(-offset, -offset + length));
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}
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}
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var o = u8concat(chunks);
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if(o.length != usz) throw new Error(`Unexpected length: ${o.length} != ${usz}`);
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return o;
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}
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function deframe(buf: Uint8Array): Uint8Array {
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var out = [];
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var l = 0;
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while(l < buf.length) {
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var t = buf[l++];
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var len = buf[l] | (buf[l+1]<<8) | (buf[l+2] << 16); l += 3;
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out.push(parse_snappy_chunk(t, buf.slice(l, l + len)));
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l += len;
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}
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if(l !== buf.length) throw new Error("data is not a valid framed stream!");
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return u8concat(out);
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}
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function parse_old_storage(buf: Uint8Array, sst: string[], rsst: string[]): CellObject {
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var dv = u8_to_dataview(buf);
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var ctype = buf[buf[0] == 4 ? 1 : 2];
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/* TODO: find the correct field position of number formats, formulae, etc */
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var flags = dv.getUint32(4, true);
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var data_offset = 12 + popcnt(flags & 0x0D8E) * 4;
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var ridx = -1, sidx = -1, ieee = NaN, dt = new Date(2001, 0, 1);
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if(flags & 0x0200) { ridx = dv.getUint32(data_offset, true); data_offset += 4; }
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data_offset += popcnt(flags & 0x3000) * 4;
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if(flags & 0x0010) { sidx = dv.getUint32(data_offset, true); data_offset += 4; }
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if(flags & 0x0020) { ieee = dv.getFloat64(data_offset, true); data_offset += 8; }
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if(flags & 0x0040) { dt.setTime(dt.getTime() + dv.getFloat64(data_offset, true) * 1000); data_offset += 8; }
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var ret: CellObject;
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switch(ctype) {
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case 0: break; // return { t: "z" }; // blank?
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case 2: ret = { t: "n", v: ieee }; break; // number
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case 3: ret = { t: "s", v: sst[sidx] }; break; // string
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case 5: ret = { t: "d", v: dt }; break; // date-time
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case 6: ret = { t: "b", v: ieee > 0 }; break; // boolean
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case 7: ret = { t: "n", v: ieee }; break; // duration in seconds TODO: emit [hh]:[mm] style format with adjusted value
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case 8: ret = { t: "e", v: 0}; break; // "formula error" TODO: enumerate and map errors to csf equivalents
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case 9: { // "automatic"?
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if(ridx > -1) ret = { t: "s", v: rsst[ridx] };
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else if(sidx > -1) ret = { t: "s", v: sst[sidx] };
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else if(!isNaN(ieee)) ret = { t: "n", v: ieee };
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else throw new Error(`Unsupported cell type ${buf.slice(0,4)}`);
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} break;
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default: throw new Error(`Unsupported cell type ${buf.slice(0,4)}`);
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}
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/* TODO: Some fields appear after the cell data */
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return ret;
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}
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function parse_storage(buf: Uint8Array, sst: string[], rsst: string[]): CellObject {
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var dv = u8_to_dataview(buf);
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var ctype = buf[1];
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/* TODO: find the correct field position of number formats, formulae, etc */
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var flags = dv.getUint32(8, true);
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var data_offset = 12;
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var ridx = -1, sidx = -1, d128 = NaN, ieee = NaN, dt = new Date(2001, 0, 1);
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if(flags & 0x0001) { d128 = readDecimal128LE(buf, data_offset); data_offset += 16; }
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if(flags & 0x0002) { ieee = dv.getFloat64(data_offset, true); data_offset += 8; }
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if(flags & 0x0004) { dt.setTime(dt.getTime() + dv.getFloat64(data_offset, true) * 1000); data_offset += 8; }
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if(flags & 0x0008) { sidx = dv.getUint32(data_offset, true); data_offset += 4; }
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if(flags & 0x0010) { ridx = dv.getUint32(data_offset, true); data_offset += 4; }
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var ret: CellObject;
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switch(ctype) {
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case 0: break; // return { t: "z" }; // blank?
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case 2: ret = { t: "n", v: d128 }; break; // number
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case 3: ret = { t: "s", v: sst[sidx] }; break; // string
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case 5: ret = { t: "d", v: dt }; break; // date-time
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case 6: ret = { t: "b", v: ieee > 0 }; break; // boolean
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case 7: ret = { t: "n", v: ieee }; break; // duration in seconds TODO: emit [hh]:[mm] style format with adjusted value
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case 8: ret = { t: "e", v: 0}; break; // "formula error" TODO: enumerate and map errors to csf equivalents
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case 9: { // "automatic"?
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if(ridx > -1) ret = { t: "s", v: rsst[ridx] };
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else throw new Error(`Unsupported cell type ${ctype} : ${flags & 0x1F} : ${buf.slice(0,4)}`);
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} break;
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case 10: ret = { t: "n", v: d128 }; break; // currency
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default: throw new Error(`Unsupported cell type ${ctype} : ${flags & 0x1F} : ${buf.slice(0,4)}`);
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}
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/* TODO: All styling fields appear after the cell data */
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return ret;
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}
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function parse_cell_storage(buf: Uint8Array, sst: string[], rsst: string[]): CellObject {
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switch(buf[0]) {
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/* TODO: 0-2? */
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case 3: case 4: return parse_old_storage(buf, sst, rsst);
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case 5: return parse_storage(buf, sst, rsst);
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default: throw new Error(`Unsupported payload version ${buf[0]}`);
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}
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}
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// .TSP.Reference
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function parse_TSP_Reference(buf: Uint8Array): number {
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var pb = parse_shallow(buf);
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return parse_varint49(pb[1][0].data);
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}
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// .TST.TableDataList
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function parse_TST_TableDataList(M: IWAMessage[][], root: IWAMessage): string[] {
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var pb = parse_shallow(root.data);
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// .TST.TableDataList.ListType
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var type = varint_to_i32(pb[1][0].data);
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var entries = pb[3];
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var data = [];
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(entries||[]).forEach(entry => {
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// .TST.TableDataList.ListEntry
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var le = parse_shallow(entry.data);
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var key = varint_to_i32(le[1][0].data)>>>0;
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switch(type) {
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case 1: data[key] = u8str(le[3][0].data); break;
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case 8: {
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// .TSP.RichTextPayloadArchive
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var rt = M[parse_TSP_Reference(le[9][0].data)][0];
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var rtp = parse_shallow(rt.data);
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// .TSWP.StorageArchive
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var rtpref = M[parse_TSP_Reference(rtp[1][0].data)][0];
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var mtype = varint_to_i32(rtpref.meta[1][0].data);
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if(mtype != 2001) throw new Error(`2000 unexpected reference to ${mtype}`);
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var tswpsa = parse_shallow(rtpref.data);
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data[key] = tswpsa[3].map(x => u8str(x.data)).join("");
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} break;
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}
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});
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return data;
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}
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interface TileRowInfo {
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R: number;
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cells?: Uint8Array[];
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}
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// .TSP.TileRowInfo
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function parse_TST_TileRowInfo(u8: Uint8Array): TileRowInfo {
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var pb = parse_shallow(u8);
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var R = varint_to_i32(pb[1][0].data) >>> 0;
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var pre_bnc = pb[3]?.[0]?.data;
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var pre_bnc_offsets = pb[4]?.[0]?.data && u8_to_dataview(pb[4][0].data);
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var storage = pb[6]?.[0]?.data;
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var storage_offsets = pb[7]?.[0]?.data && u8_to_dataview(pb[7][0].data);
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var wide_offsets = pb[8]?.[0]?.data && varint_to_i32(pb[8][0].data) > 0 || false;
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var width = wide_offsets ? 4 : 1;
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var cells = [];
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var off = 0;
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for(var C = 0; C < pre_bnc_offsets.byteLength/2; ++C) {
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/* prefer storage if it is present, otherwise fall back on pre_bnc */
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if(storage && storage_offsets) {
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off = storage_offsets.getUint16(C*2, true) * width;
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if(off < storage.length) { cells[C] = storage.subarray(off, storage_offsets.getUint16(C*2+2, true) * width); continue; }
|
|
}
|
|
if(pre_bnc && pre_bnc_offsets) {
|
|
off = pre_bnc_offsets.getUint16(C*2, true) * width;
|
|
if(off < pre_bnc.length) cells[C] = pre_bnc.subarray(off, pre_bnc_offsets.getUint16(C*2+2, true) * width);
|
|
}
|
|
}
|
|
return { R, cells };
|
|
}
|
|
|
|
// .TST.Tile
|
|
function parse_TST_Tile(M: IWAMessage[][], root: IWAMessage): Uint8Array[][] {
|
|
var pb = parse_shallow(root.data);
|
|
var ri = mappa(pb[5], parse_TST_TileRowInfo);
|
|
return ri.reduce((acc, x) => {
|
|
if(!acc[x.R]) acc[x.R] = [];
|
|
x.cells.forEach((cell, C) => {
|
|
if(acc[x.R][C]) throw new Error(`Duplicate cell r=${x.R} c=${C}`);
|
|
acc[x.R][C] = cell;
|
|
});
|
|
return acc;
|
|
}, [] as Uint8Array[][]);
|
|
}
|
|
|
|
// .TST.TableModelArchive
|
|
function parse_TST_TableModelArchive(M: IWAMessage[][], root: IWAMessage, ws: WorkSheet) {
|
|
var pb = parse_shallow(root.data);
|
|
var range: Range = { s: {r:0, c:0}, e: {r:0, c:0} };
|
|
range.e.r = (varint_to_i32(pb[6][0].data) >>> 0) - 1;
|
|
if(range.e.r < 0) throw new Error(`Invalid row varint ${pb[6][0].data}`);
|
|
range.e.c = (varint_to_i32(pb[7][0].data) >>> 0) - 1;
|
|
if(range.e.c < 0) throw new Error(`Invalid col varint ${pb[7][0].data}`);
|
|
ws["!ref"] = encode_range(range);
|
|
|
|
{
|
|
// .TST.DataStore
|
|
var store = parse_shallow(pb[4][0].data);
|
|
|
|
var sst = parse_TST_TableDataList(M, M[parse_TSP_Reference(store[4][0].data)][0]);
|
|
var rsst: string[] = store[17]?.[0] ? parse_TST_TableDataList(M, M[parse_TSP_Reference(store[17][0].data)][0]) : [];
|
|
{
|
|
// .TST.TileStorage
|
|
var tile = parse_shallow(store[3][0].data);
|
|
var tiles: Array<{id: number, ref: Uint8Array[][]}> = [];
|
|
tile[1].forEach(t => {
|
|
var tl = (parse_shallow(t.data));
|
|
var ref = M[parse_TSP_Reference(tl[2][0].data)][0];
|
|
var mtype = varint_to_i32(ref.meta[1][0].data);
|
|
if(mtype != 6002) throw new Error(`6001 unexpected reference to ${mtype}`);
|
|
tiles.push({id: varint_to_i32(tl[1][0].data), ref: parse_TST_Tile(M, ref) });
|
|
});
|
|
tiles.forEach((tile) => {
|
|
tile.ref.forEach((row, R) => {
|
|
row.forEach((buf, C) => {
|
|
var addr = encode_cell({r:R,c:C});
|
|
var res = parse_cell_storage(buf, sst, rsst);
|
|
if(res) ws[addr] = res;
|
|
});
|
|
});
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
// .TST.TableInfoArchive
|
|
function parse_TST_TableInfoArchive(M: IWAMessage[][], root: IWAMessage): WorkSheet {
|
|
var pb = parse_shallow(root.data);
|
|
var out: WorkSheet = { "!ref": "A1" };
|
|
var tableref = M[parse_TSP_Reference(pb[2][0].data)];
|
|
var mtype = varint_to_i32(tableref[0].meta[1][0].data);
|
|
if(mtype != 6001) throw new Error(`6000 unexpected reference to ${mtype}`);
|
|
parse_TST_TableModelArchive(M, tableref[0], out);
|
|
return out;
|
|
}
|
|
|
|
// .TN.SheetArchive
|
|
interface NSheet {
|
|
name: string;
|
|
sheets: WorkSheet[];
|
|
}
|
|
function parse_TN_SheetArchive(M: IWAMessage[][], root: IWAMessage): NSheet {
|
|
var pb = parse_shallow(root.data);
|
|
var out: NSheet = {
|
|
name: (pb[1]?.[0] ? u8str(pb[1][0].data) : ""),
|
|
sheets: []
|
|
};
|
|
var shapeoffs = mappa(pb[2], parse_TSP_Reference);
|
|
shapeoffs.forEach((off) => {
|
|
M[off].forEach((m: IWAMessage) => {
|
|
var mtype = varint_to_i32(m.meta[1][0].data);
|
|
if(mtype == 6000) out.sheets.push(parse_TST_TableInfoArchive(M, m));
|
|
});
|
|
});
|
|
return out;
|
|
}
|
|
|
|
// .TN.DocumentArchive
|
|
function parse_TN_DocumentArchive(M: IWAMessage[][], root: IWAMessage): WorkBook {
|
|
var out = book_new();
|
|
var pb = parse_shallow(root.data);
|
|
var sheetoffs = mappa(pb[1], parse_TSP_Reference);
|
|
sheetoffs.forEach((off) => {
|
|
M[off].forEach((m: IWAMessage) => {
|
|
var mtype = varint_to_i32(m.meta[1][0].data);
|
|
if(mtype == 2) {
|
|
var root = parse_TN_SheetArchive(M, m);
|
|
root.sheets.forEach(sheet => { book_append_sheet(out, sheet, root.name); });
|
|
}
|
|
});
|
|
});
|
|
if(out.SheetNames.length == 0) throw new Error("Empty NUMBERS file");
|
|
return out;
|
|
}
|
|
|
|
/* exported parse_numbers_iwa */
|
|
function parse_numbers_iwa(cfb: CFB$Container): WorkBook {
|
|
var out: IWAMessage[][] = [];
|
|
cfb.FullPaths.forEach(p => { if(p.match(/\.iwpv2/)) throw new Error(`Unsupported password protection`); });
|
|
/* collect entire message space */
|
|
cfb.FileIndex.forEach(s => {
|
|
if(!s.name.match(/\.iwa$/)) return;
|
|
var o: Uint8Array;
|
|
try { o = deframe(s.content as Uint8Array); } catch(e) { return console.log("?? " + s.content.length + " " + (e.message || e)); }
|
|
var packets: IWAArchiveInfo[];
|
|
try { packets = parse_iwa_file(o); } catch(e) { return console.log("## " + (e.message || e)); }
|
|
packets.forEach(packet => {out[+packet.id] = packet.messages;});
|
|
});
|
|
if(!out.length) throw new Error("File has no messages");
|
|
/* find document root */
|
|
var docroot: IWAMessage;
|
|
out.forEach((iwams) => {
|
|
iwams.forEach((iwam) => {
|
|
var mtype = varint_to_i32(iwam.meta[1][0].data) >>> 0;
|
|
if(mtype == 1) {
|
|
if(!docroot) docroot = iwam;
|
|
else throw new Error("Document has multiple roots");
|
|
}
|
|
});
|
|
});
|
|
if(!docroot) throw new Error("Cannot find Document root");
|
|
return parse_TN_DocumentArchive(out, docroot);
|
|
}
|