forked from sheetjs/sheetjs
384 lines
11 KiB
JavaScript
384 lines
11 KiB
JavaScript
var DO_NOT_EXPORT_CFB = true;
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/* cfb.js (C) 2013-2014 SheetJS -- http://sheetjs.com */
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/* vim: set ts=2: */
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/*jshint eqnull:true */
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/* [MS-CFB] v20130118 */
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var CFB = (function _CFB(){
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var exports = {};
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exports.version = '0.10.2';
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function parse(file) {
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var mver = 3; // major version
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var ssz = 512; // sector size
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var nmfs = 0; // number of mini FAT sectors
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var ndfs = 0; // number of DIFAT sectors
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var dir_start = 0; // first directory sector location
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var minifat_start = 0; // first mini FAT sector location
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var difat_start = 0; // first mini FAT sector location
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var fat_addrs = []; // locations of FAT sectors
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/* [MS-CFB] 2.2 Compound File Header */
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var blob = file.slice(0,512);
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prep_blob(blob, 0);
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/* major version */
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var mv = check_get_mver(blob);
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mver = mv[0];
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switch(mver) {
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case 3: ssz = 512; break; case 4: ssz = 4096; break;
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default: throw "Major Version: Expected 3 or 4 saw " + mver;
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}
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/* reprocess header */
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if(ssz !== 512) { blob = file.slice(0,ssz); prep_blob(blob, 28 /* blob.l */); }
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/* Save header for final object */
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var header = file.slice(0,ssz);
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check_shifts(blob, mver);
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// Number of Directory Sectors
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var nds = blob.read_shift(4, 'i');
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if(mver === 3 && nds !== 0) throw '# Directory Sectors: Expected 0 saw ' + nds;
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// Number of FAT Sectors
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//var nfs = blob.read_shift(4, 'i');
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blob.l += 4;
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// First Directory Sector Location
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dir_start = blob.read_shift(4, 'i');
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// Transaction Signature
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blob.l += 4;
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// Mini Stream Cutoff Size
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blob.chk('00100000', 'Mini Stream Cutoff Size: ');
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// First Mini FAT Sector Location
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minifat_start = blob.read_shift(4, 'i');
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// Number of Mini FAT Sectors
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nmfs = blob.read_shift(4, 'i');
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// First DIFAT sector location
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difat_start = blob.read_shift(4, 'i');
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// Number of DIFAT Sectors
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ndfs = blob.read_shift(4, 'i');
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// Grab FAT Sector Locations
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for(var q, j = 0; j < 109; ++j) { /* 109 = (512 - blob.l)>>>2; */
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q = blob.read_shift(4, 'i');
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if(q<0) break;
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fat_addrs[j] = q;
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}
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/** Break the file up into sectors */
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var sectors = sectorify(file, ssz);
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sleuth_fat(difat_start, ndfs, sectors, ssz, fat_addrs);
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/** Chains */
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var sector_list = make_sector_list(sectors, dir_start, fat_addrs, ssz);
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sector_list[dir_start].name = "!Directory";
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if(nmfs > 0 && minifat_start !== ENDOFCHAIN) sector_list[minifat_start].name = "!MiniFAT";
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sector_list[fat_addrs[0]].name = "!FAT";
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sector_list.fat_addrs = fat_addrs;
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sector_list.ssz = ssz;
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/* [MS-CFB] 2.6.1 Compound File Directory Entry */
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var files = {}, Paths = [], FileIndex = [], FullPaths = [], FullPathDir = {};
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read_directory(dir_start, sector_list, sectors, Paths, nmfs, files, FileIndex);
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build_full_paths(FileIndex, FullPathDir, FullPaths, Paths);
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var root_name = Paths.shift();
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Paths.root = root_name;
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/* [MS-CFB] 2.6.4 (Unicode 3.0.1 case conversion) */
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var find_path = make_find_path(FullPaths, Paths, FileIndex, files, root_name);
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return {
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raw: {header: header, sectors: sectors},
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FileIndex: FileIndex,
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FullPaths: FullPaths,
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FullPathDir: FullPathDir,
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find: find_path
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};
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} // parse
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/* [MS-CFB] 2.2 Compound File Header -- read up to major version */
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function check_get_mver(blob) {
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// header signature 8
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blob.chk(HEADER_SIGNATURE, 'Header Signature: ');
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// clsid 16
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blob.chk(HEADER_CLSID, 'CLSID: ');
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// minor version 2
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var mver = blob.read_shift(2, 'u');
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return [blob.read_shift(2,'u'), mver];
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}
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function check_shifts(blob, mver) {
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var shift = 0x09;
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// Byte Order
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blob.chk('feff', 'Byte Order: ');
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// Sector Shift
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switch((shift = blob.read_shift(2))) {
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case 0x09: if(mver !== 3) throw 'MajorVersion/SectorShift Mismatch'; break;
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case 0x0c: if(mver !== 4) throw 'MajorVersion/SectorShift Mismatch'; break;
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default: throw 'Sector Shift: Expected 9 or 12 saw ' + shift;
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}
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// Mini Sector Shift
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blob.chk('0600', 'Mini Sector Shift: ');
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// Reserved
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blob.chk('000000000000', 'Reserved: ');
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}
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/** Break the file up into sectors */
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function sectorify(file, ssz) {
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var nsectors = Math.ceil(file.length/ssz)-1;
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var sectors = new Array(nsectors);
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for(var i=1; i < nsectors; ++i) sectors[i-1] = file.slice(i*ssz,(i+1)*ssz);
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sectors[nsectors-1] = file.slice(nsectors*ssz);
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return sectors;
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}
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/* [MS-CFB] 2.6.4 Red-Black Tree */
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function build_full_paths(FI, FPD, FP, Paths) {
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var i = 0, L = 0, R = 0, C = 0, j = 0, pl = Paths.length;
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var dad = new Array(pl), q = new Array(pl);
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for(; i < pl; ++i) { dad[i]=q[i]=i; FP[i]=Paths[i]; }
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for(; j < q.length; ++j) {
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i = q[j];
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L = FI[i].L; R = FI[i].R; C = FI[i].C;
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if(dad[i] === i) {
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if(L !== -1 /*NOSTREAM*/ && dad[L] !== L) dad[i] = dad[L];
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if(R !== -1 && dad[R] !== R) dad[i] = dad[R];
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}
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if(C !== -1 /*NOSTREAM*/) dad[C] = i;
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if(L !== -1) { dad[L] = dad[i]; q.push(L); }
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if(R !== -1) { dad[R] = dad[i]; q.push(R); }
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}
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for(i=1; i !== pl; ++i) if(dad[i] === i) {
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if(R !== -1 /*NOSTREAM*/ && dad[R] !== R) dad[i] = dad[R];
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else if(L !== -1 && dad[L] !== L) dad[i] = dad[L];
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}
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for(i=1; i < pl; ++i) {
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if(FI[i].type === 0 /* unknown */) continue;
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j = dad[i];
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if(j === 0) FP[i] = FP[0] + "/" + FP[i];
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else while(j !== 0) {
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FP[i] = FP[j] + "/" + FP[i];
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j = dad[j];
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}
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dad[i] = 0;
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}
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FP[0] += "/";
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for(i=1; i < pl; ++i) {
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if(FI[i].type !== 2 /* stream */) FP[i] += "/";
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FPD[FP[i]] = FI[i];
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}
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}
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/* [MS-CFB] 2.6.4 */
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function make_find_path(FullPaths, Paths, FileIndex, files, root_name) {
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var UCFullPaths = new Array(FullPaths.length);
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var UCPaths = new Array(Paths.length), i;
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for(i = 0; i < FullPaths.length; ++i) UCFullPaths[i] = FullPaths[i].toUpperCase().replace(chr0,'').replace(chr1,'!');
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for(i = 0; i < Paths.length; ++i) UCPaths[i] = Paths[i].toUpperCase().replace(chr0,'').replace(chr1,'!');
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return function find_path(path) {
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var k;
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if(path.charCodeAt(0) === 47 /* "/" */) { k=true; path = root_name + path; }
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else k = path.indexOf("/") !== -1;
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var UCPath = path.toUpperCase().replace(chr0,'').replace(chr1,'!');
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var w = k === true ? UCFullPaths.indexOf(UCPath) : UCPaths.indexOf(UCPath);
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if(w === -1) return null;
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return k === true ? FileIndex[w] : files[Paths[w]];
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};
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}
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/** Chase down the rest of the DIFAT chain to build a comprehensive list
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DIFAT chains by storing the next sector number as the last 32 bytes */
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function sleuth_fat(idx, cnt, sectors, ssz, fat_addrs) {
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var q;
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if(idx === ENDOFCHAIN) {
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if(cnt !== 0) throw "DIFAT chain shorter than expected";
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} else if(idx !== -1 /*FREESECT*/) {
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var sector = sectors[idx], m = (ssz>>>2)-1;
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for(var i = 0; i < m; ++i) {
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if((q = __readInt32LE(sector,i*4)) === ENDOFCHAIN) break;
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fat_addrs.push(q);
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}
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sleuth_fat(__readInt32LE(sector,ssz-4),cnt - 1, sectors, ssz, fat_addrs);
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}
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}
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/** Follow the linked list of sectors for a given starting point */
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function get_sector_list(sectors, start, fat_addrs, ssz, chkd) {
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var sl = sectors.length;
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var buf, buf_chain;
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if(!chkd) chkd = new Array(sl);
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var modulus = ssz - 1, j, jj;
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buf = [];
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buf_chain = [];
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for(j=start; j>=0;) {
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chkd[j] = true;
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buf[buf.length] = j;
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buf_chain.push(sectors[j]);
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var addr = fat_addrs[Math.floor(j*4/ssz)];
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jj = ((j*4) & modulus);
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if(ssz < 4 + jj) throw "FAT boundary crossed: " + j + " 4 "+ssz;
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j = __readInt32LE(sectors[addr], jj);
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}
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return {nodes: buf, data:__toBuffer([buf_chain])};
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}
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/** Chase down the sector linked lists */
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function make_sector_list(sectors, dir_start, fat_addrs, ssz) {
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var sl = sectors.length, sector_list = new Array(sl);
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var chkd = new Array(sl), buf, buf_chain;
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var modulus = ssz - 1, i, j, k, jj;
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for(i=0; i < sl; ++i) {
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buf = [];
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k = (i + dir_start); if(k >= sl) k-=sl;
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if(chkd[k] === true) continue;
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buf_chain = [];
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for(j=k; j>=0;) {
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chkd[j] = true;
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buf[buf.length] = j;
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buf_chain.push(sectors[j]);
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var addr = fat_addrs[Math.floor(j*4/ssz)];
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jj = ((j*4) & modulus);
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if(ssz < 4 + jj) throw "FAT boundary crossed: " + j + " 4 "+ssz;
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j = __readInt32LE(sectors[addr], jj);
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}
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sector_list[k] = {nodes: buf, data:__toBuffer([buf_chain])};
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}
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return sector_list;
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}
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/* [MS-CFB] 2.6.1 Compound File Directory Entry */
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function read_directory(dir_start, sector_list, sectors, Paths, nmfs, files, FileIndex) {
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var blob;
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var minifat_store = 0, pl = (Paths.length?2:0);
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var sector = sector_list[dir_start].data;
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var i = 0, namelen = 0, name, o, ctime, mtime;
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for(; i < sector.length; i+= 128) {
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blob = sector.slice(i, i+128);
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prep_blob(blob, 64);
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namelen = blob.read_shift(2);
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if(namelen === 0) continue;
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name = __utf16le(blob,0,namelen-pl);
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Paths.push(name);
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o = {
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name: name,
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type: blob.read_shift(1),
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color: blob.read_shift(1),
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L: blob.read_shift(4, 'i'),
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R: blob.read_shift(4, 'i'),
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C: blob.read_shift(4, 'i'),
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clsid: blob.read_shift(16),
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state: blob.read_shift(4, 'i')
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};
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ctime = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2);
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if(ctime !== 0) {
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o.ctime = ctime; o.ct = read_date(blob, blob.l-8);
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}
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mtime = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2);
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if(mtime !== 0) {
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o.mtime = mtime; o.mt = read_date(blob, blob.l-8);
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}
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o.start = blob.read_shift(4, 'i');
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o.size = blob.read_shift(4, 'i');
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if(o.type === 5) { /* root */
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minifat_store = o.start;
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if(nmfs > 0 && minifat_store !== ENDOFCHAIN) sector_list[minifat_store].name = "!StreamData";
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/*minifat_size = o.size;*/
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} else if(o.size >= 4096 /* MSCSZ */) {
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o.storage = 'fat';
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if(sector_list[o.start] === undefined) sector_list[o.start] = get_sector_list(sectors, o.start, sector_list.fat_addrs, sector_list.ssz);
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sector_list[o.start].name = o.name;
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o.content = sector_list[o.start].data.slice(0,o.size);
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prep_blob(o.content, 0);
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} else {
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o.storage = 'minifat';
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if(minifat_store !== ENDOFCHAIN && o.start !== ENDOFCHAIN) {
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o.content = sector_list[minifat_store].data.slice(o.start*MSSZ,o.start*MSSZ+o.size);
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prep_blob(o.content, 0);
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}
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}
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files[name] = o;
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FileIndex.push(o);
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}
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}
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function read_date(blob, offset) {
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return new Date(( ( (__readUInt32LE(blob,offset+4)/1e7)*Math.pow(2,32)+__readUInt32LE(blob,offset)/1e7 ) - 11644473600)*1000);
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}
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var fs;
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function readFileSync(filename, options) {
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if(fs === undefined) fs = require('fs');
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return parse(fs.readFileSync(filename), options);
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}
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function readSync(blob, options) {
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switch(options !== undefined && options.type !== undefined ? options.type : "base64") {
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case "file": return readFileSync(blob, options);
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case "base64": return parse(s2a(Base64.decode(blob)), options);
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case "binary": return parse(s2a(blob), options);
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}
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return parse(blob);
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}
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/** CFB Constants */
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var MSSZ = 64; /* Mini Sector Size = 1<<6 */
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//var MSCSZ = 4096; /* Mini Stream Cutoff Size */
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/* 2.1 Compound File Sector Numbers and Types */
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var ENDOFCHAIN = -2;
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/* 2.2 Compound File Header */
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var HEADER_SIGNATURE = 'd0cf11e0a1b11ae1';
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var HEADER_CLSID = '00000000000000000000000000000000';
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var consts = {
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/* 2.1 Compund File Sector Numbers and Types */
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MAXREGSECT: -6,
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DIFSECT: -4,
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FATSECT: -3,
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ENDOFCHAIN: ENDOFCHAIN,
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FREESECT: -1,
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/* 2.2 Compound File Header */
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HEADER_SIGNATURE: HEADER_SIGNATURE,
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HEADER_MINOR_VERSION: '3e00',
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MAXREGSID: -6,
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NOSTREAM: -1,
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HEADER_CLSID: HEADER_CLSID,
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/* 2.6.1 Compound File Directory Entry */
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EntryTypes: ['unknown','storage','stream','lockbytes','property','root']
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};
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exports.read = readSync;
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exports.parse = parse;
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exports.utils = {
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ReadShift: ReadShift,
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CheckField: CheckField,
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prep_blob: prep_blob,
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bconcat: bconcat,
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consts: consts
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};
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return exports;
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})();
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if(typeof require !== 'undefined' && typeof module !== 'undefined' && typeof DO_NOT_EXPORT_CFB === 'undefined') { module.exports = CFB; }
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