var DO_NOT_EXPORT_CFB = true; /*:: declare var Base64:any; declare var ReadShift:any; declare var CheckField:any; declare var prep_blob:any; declare var __readUInt32LE:any; declare var __readInt32LE:any; declare var __toBuffer:any; declare var __utf16le:any; declare var bconcat:any; declare var s2a:any; declare var chr0:any; declare var chr1:any; */ /* cfb.js (C) 2013-present SheetJS -- http://sheetjs.com */ /* vim: set ts=2: */ /*jshint eqnull:true */ /*:: declare var DO_NOT_EXPORT_CFB:any; type SectorEntry = any; type SectorList = { (k:string|number):SectorEntry; name:?string; fat_addrs:any; ssz:number; } */ /* [MS-CFB] v20130118 */ var CFB = (function _CFB(){ var exports = {}; exports.version = '0.10.3'; function parse(file) { var mver = 3; // major version var ssz = 512; // sector size var nmfs = 0; // number of mini FAT sectors var ndfs = 0; // number of DIFAT sectors var dir_start = 0; // first directory sector location var minifat_start = 0; // first mini FAT sector location var difat_start = 0; // first mini FAT sector location var fat_addrs = []; // locations of FAT sectors /* [MS-CFB] 2.2 Compound File Header */ var blob/*:any*/ = file.slice(0,512); prep_blob(blob, 0); /* major version */ var mv = check_get_mver(blob); mver = mv[0]; switch(mver) { case 3: ssz = 512; break; case 4: ssz = 4096; break; default: throw "Major Version: Expected 3 or 4 saw " + mver; } /* reprocess header */ if(ssz !== 512) { blob = file.slice(0,ssz); prep_blob(blob, 28 /* blob.l */); } /* Save header for final object */ var header = file.slice(0,ssz); check_shifts(blob, mver); // Number of Directory Sectors var nds = blob.read_shift(4, 'i'); if(mver === 3 && nds !== 0) throw '# Directory Sectors: Expected 0 saw ' + nds; // Number of FAT Sectors //var nfs = blob.read_shift(4, 'i'); blob.l += 4; // First Directory Sector Location dir_start = blob.read_shift(4, 'i'); // Transaction Signature blob.l += 4; // Mini Stream Cutoff Size blob.chk('00100000', 'Mini Stream Cutoff Size: '); // First Mini FAT Sector Location minifat_start = blob.read_shift(4, 'i'); // Number of Mini FAT Sectors nmfs = blob.read_shift(4, 'i'); // First DIFAT sector location difat_start = blob.read_shift(4, 'i'); // Number of DIFAT Sectors ndfs = blob.read_shift(4, 'i'); // Grab FAT Sector Locations for(var q, j = 0; j < 109; ++j) { /* 109 = (512 - blob.l)>>>2; */ q = blob.read_shift(4, 'i'); if(q<0) break; fat_addrs[j] = q; } /** Break the file up into sectors */ var sectors = sectorify(file, ssz); sleuth_fat(difat_start, ndfs, sectors, ssz, fat_addrs); /** Chains */ var sector_list/*:SectorList*/ = make_sector_list(sectors, dir_start, fat_addrs, ssz); sector_list[dir_start].name = "!Directory"; if(nmfs > 0 && minifat_start !== ENDOFCHAIN) sector_list[minifat_start].name = "!MiniFAT"; sector_list[fat_addrs[0]].name = "!FAT"; sector_list.fat_addrs = fat_addrs; sector_list.ssz = ssz; /* [MS-CFB] 2.6.1 Compound File Directory Entry */ var files = {}, Paths/*:any*/ = [], FileIndex = [], FullPaths = [], FullPathDir = {}; read_directory(dir_start, sector_list, sectors, Paths, nmfs, files, FileIndex); build_full_paths(FileIndex, FullPathDir, FullPaths, Paths); var root_name = Paths.shift(); Paths.root = root_name; /* [MS-CFB] 2.6.4 (Unicode 3.0.1 case conversion) */ var find_path = make_find_path(FullPaths, Paths, FileIndex, files, root_name); return { raw: {header: header, sectors: sectors}, FileIndex: FileIndex, FullPaths: FullPaths, FullPathDir: FullPathDir, find: find_path }; } // parse /* [MS-CFB] 2.2 Compound File Header -- read up to major version */ function check_get_mver(blob) { // header signature 8 blob.chk(HEADER_SIGNATURE, 'Header Signature: '); // clsid 16 blob.chk(HEADER_CLSID, 'CLSID: '); // minor version 2 var mver = blob.read_shift(2, 'u'); return [blob.read_shift(2,'u'), mver]; } function check_shifts(blob, mver) { var shift = 0x09; // Byte Order blob.chk('feff', 'Byte Order: '); // Sector Shift switch((shift = blob.read_shift(2))) { case 0x09: if(mver !== 3) throw 'MajorVersion/SectorShift Mismatch'; break; case 0x0c: if(mver !== 4) throw 'MajorVersion/SectorShift Mismatch'; break; default: throw 'Sector Shift: Expected 9 or 12 saw ' + shift; } // Mini Sector Shift blob.chk('0600', 'Mini Sector Shift: '); // Reserved blob.chk('000000000000', 'Reserved: '); } /** Break the file up into sectors */ function sectorify(file, ssz) { var nsectors = Math.ceil(file.length/ssz)-1; var sectors = new Array(nsectors); for(var i=1; i < nsectors; ++i) sectors[i-1] = file.slice(i*ssz,(i+1)*ssz); sectors[nsectors-1] = file.slice(nsectors*ssz); return sectors; } /* [MS-CFB] 2.6.4 Red-Black Tree */ function build_full_paths(FI, FPD, FP, Paths) { var i = 0, L = 0, R = 0, C = 0, j = 0, pl = Paths.length; var dad = new Array(pl), q = new Array(pl); for(; i < pl; ++i) { dad[i]=q[i]=i; FP[i]=Paths[i]; } for(; j < q.length; ++j) { i = q[j]; L = FI[i].L; R = FI[i].R; C = FI[i].C; if(dad[i] === i) { if(L !== -1 /*NOSTREAM*/ && dad[L] !== L) dad[i] = dad[L]; if(R !== -1 && dad[R] !== R) dad[i] = dad[R]; } if(C !== -1 /*NOSTREAM*/) dad[C] = i; if(L !== -1) { dad[L] = dad[i]; q.push(L); } if(R !== -1) { dad[R] = dad[i]; q.push(R); } } for(i=1; i !== pl; ++i) if(dad[i] === i) { if(R !== -1 /*NOSTREAM*/ && dad[R] !== R) dad[i] = dad[R]; else if(L !== -1 && dad[L] !== L) dad[i] = dad[L]; } for(i=1; i < pl; ++i) { if(FI[i].type === 0 /* unknown */) continue; j = dad[i]; if(j === 0) FP[i] = FP[0] + "/" + FP[i]; else while(j !== 0) { FP[i] = FP[j] + "/" + FP[i]; j = dad[j]; } dad[i] = 0; } FP[0] += "/"; for(i=1; i < pl; ++i) { if(FI[i].type !== 2 /* stream */) FP[i] += "/"; FPD[FP[i]] = FI[i]; } } /* [MS-CFB] 2.6.4 */ function make_find_path(FullPaths, Paths, FileIndex, files, root_name) { var UCFullPaths = new Array(FullPaths.length); var UCPaths = new Array(Paths.length), i; for(i = 0; i < FullPaths.length; ++i) UCFullPaths[i] = FullPaths[i].toUpperCase().replace(chr0,'').replace(chr1,'!'); for(i = 0; i < Paths.length; ++i) UCPaths[i] = Paths[i].toUpperCase().replace(chr0,'').replace(chr1,'!'); return function find_path(path/*:string*/) { var k; if(path.charCodeAt(0) === 47 /* "/" */) { k=true; path = root_name + path; } else k = path.indexOf("/") !== -1; var UCPath = path.toUpperCase().replace(chr0,'').replace(chr1,'!'); var w = k === true ? UCFullPaths.indexOf(UCPath) : UCPaths.indexOf(UCPath); if(w === -1) return null; return k === true ? FileIndex[w] : files[Paths[w]]; }; } /** Chase down the rest of the DIFAT chain to build a comprehensive list DIFAT chains by storing the next sector number as the last 32 bytes */ function sleuth_fat(idx, cnt, sectors, ssz, fat_addrs) { var q; if(idx === ENDOFCHAIN) { if(cnt !== 0) throw "DIFAT chain shorter than expected"; } else if(idx !== -1 /*FREESECT*/) { var sector = sectors[idx], m = (ssz>>>2)-1; if(!sector) return; for(var i = 0; i < m; ++i) { if((q = __readInt32LE(sector,i*4)) === ENDOFCHAIN) break; fat_addrs.push(q); } sleuth_fat(__readInt32LE(sector,ssz-4),cnt - 1, sectors, ssz, fat_addrs); } } /** Follow the linked list of sectors for a given starting point */ function get_sector_list(sectors, start, fat_addrs, ssz, chkd) { var sl = sectors.length; var buf, buf_chain; if(!chkd) chkd = new Array(sl); var modulus = ssz - 1, j, jj; buf = []; buf_chain = []; for(j=start; j>=0;) { chkd[j] = true; buf[buf.length] = j; buf_chain.push(sectors[j]); var addr = fat_addrs[Math.floor(j*4/ssz)]; jj = ((j*4) & modulus); if(ssz < 4 + jj) throw "FAT boundary crossed: " + j + " 4 "+ssz; if(!sectors[addr]) break; j = __readInt32LE(sectors[addr], jj); } return {nodes: buf, data:__toBuffer([buf_chain])}; } /** Chase down the sector linked lists */ function make_sector_list(sectors, dir_start, fat_addrs, ssz/*:number*/)/*:any*/ { var sl = sectors.length, sector_list = new Array(sl); var chkd = new Array(sl), buf, buf_chain; var modulus = ssz - 1, i, j, k, jj; for(i=0; i < sl; ++i) { buf = []; k = (i + dir_start); if(k >= sl) k-=sl; if(chkd[k] === true) continue; buf_chain = []; for(j=k; j>=0;) { chkd[j] = true; buf[buf.length] = j; buf_chain.push(sectors[j]); var addr = fat_addrs[Math.floor(j*4/ssz)]; jj = ((j*4) & modulus); if(ssz < 4 + jj) throw "FAT boundary crossed: " + j + " 4 "+ssz; if(!sectors[addr]) break; j = __readInt32LE(sectors[addr], jj); } sector_list[k] = {nodes: buf, data:__toBuffer([buf_chain])}; } return sector_list; } /* [MS-CFB] 2.6.1 Compound File Directory Entry */ function read_directory(dir_start, sector_list, sectors, Paths, nmfs, files, FileIndex) { var blob; var minifat_store = 0, pl = (Paths.length?2:0); var sector = sector_list[dir_start].data; var i = 0, namelen = 0, name, o, ctime, mtime; for(; i < sector.length; i+= 128) { blob = sector.slice(i, i+128); prep_blob(blob, 64); namelen = blob.read_shift(2); if(namelen === 0) continue; name = __utf16le(blob,0,namelen-pl); Paths.push(name); o = ({ name: name, type: blob.read_shift(1), color: blob.read_shift(1), L: blob.read_shift(4, 'i'), R: blob.read_shift(4, 'i'), C: blob.read_shift(4, 'i'), clsid: blob.read_shift(16), state: blob.read_shift(4, 'i') }/*:any*/); ctime = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2); if(ctime !== 0) { o.ctime = ctime; o.ct = read_date(blob, blob.l-8); } mtime = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2); if(mtime !== 0) { o.mtime = mtime; o.mt = read_date(blob, blob.l-8); } o.start = blob.read_shift(4, 'i'); o.size = blob.read_shift(4, 'i'); if(o.type === 5) { /* root */ minifat_store = o.start; if(nmfs > 0 && minifat_store !== ENDOFCHAIN) sector_list[minifat_store].name = "!StreamData"; /*minifat_size = o.size;*/ } else if(o.size >= 4096 /* MSCSZ */) { o.storage = 'fat'; if(sector_list[o.start] === undefined) sector_list[o.start] = get_sector_list(sectors, o.start, sector_list.fat_addrs, sector_list.ssz); sector_list[o.start].name = o.name; o.content = sector_list[o.start].data.slice(0,o.size); prep_blob(o.content, 0); } else { o.storage = 'minifat'; if(minifat_store !== ENDOFCHAIN && o.start !== ENDOFCHAIN) { o.content = sector_list[minifat_store].data.slice(o.start*MSSZ,o.start*MSSZ+o.size); prep_blob(o.content, 0); } } files[name] = o; FileIndex.push(o); } } function read_date(blob, offset) { return new Date(( ( (__readUInt32LE(blob,offset+4)/1e7)*Math.pow(2,32)+__readUInt32LE(blob,offset)/1e7 ) - 11644473600)*1000); } var fs; function readFileSync(filename/*:string*/, options/*:any*/) { if(fs === undefined) fs = require('fs'); return parse(fs.readFileSync(filename), options); } function readSync(blob/*:any*/, options/*:any*/) { switch(options !== undefined && options.type !== undefined ? options.type : "base64") { case "file": return readFileSync(blob, options); case "base64": return parse(s2a(Base64.decode(blob)), options); case "binary": return parse(s2a(blob), options); } return parse(blob); } /** CFB Constants */ var MSSZ = 64; /* Mini Sector Size = 1<<6 */ //var MSCSZ = 4096; /* Mini Stream Cutoff Size */ /* 2.1 Compound File Sector Numbers and Types */ var ENDOFCHAIN = -2; /* 2.2 Compound File Header */ var HEADER_SIGNATURE = 'd0cf11e0a1b11ae1'; var HEADER_CLSID = '00000000000000000000000000000000'; var consts = { /* 2.1 Compund File Sector Numbers and Types */ MAXREGSECT: -6, DIFSECT: -4, FATSECT: -3, ENDOFCHAIN: ENDOFCHAIN, FREESECT: -1, /* 2.2 Compound File Header */ HEADER_SIGNATURE: HEADER_SIGNATURE, HEADER_MINOR_VERSION: '3e00', MAXREGSID: -6, NOSTREAM: -1, HEADER_CLSID: HEADER_CLSID, /* 2.6.1 Compound File Directory Entry */ EntryTypes: ['unknown','storage','stream','lockbytes','property','root'] }; exports.read = readSync; exports.parse = parse; exports.utils = { ReadShift: ReadShift, CheckField: CheckField, prep_blob: prep_blob, bconcat: bconcat, consts: consts }; return exports; })(); if(typeof require !== 'undefined' && typeof module !== 'undefined' && typeof DO_NOT_EXPORT_CFB === 'undefined') { module.exports = CFB; }