384 lines
11 KiB
JavaScript
384 lines
11 KiB
JavaScript
var DO_NOT_EXPORT_CFB = true;
|
|
/* cfb.js (C) 2013-2014 SheetJS -- http://sheetjs.com */
|
|
/* vim: set ts=2: */
|
|
/*jshint eqnull:true */
|
|
|
|
/* [MS-CFB] v20130118 */
|
|
var CFB = (function _CFB(){
|
|
var exports = {};
|
|
exports.version = '0.10.2';
|
|
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 = 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 = 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 = [], 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) {
|
|
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;
|
|
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;
|
|
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) {
|
|
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;
|
|
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')
|
|
};
|
|
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, options) {
|
|
if(fs === undefined) fs = require('fs');
|
|
return parse(fs.readFileSync(filename), options);
|
|
}
|
|
|
|
function readSync(blob, options) {
|
|
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; }
|