sheetjs
/
sheetjs
24
Fork 25
Code Issues 176 Pull Requests 12 Wiki Activity
sheetjs/bits/18_cfb.js

737 lines
24 KiB
JavaScript
Raw Blame History

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;
declare var new_buf:any;
*/
/* cfb.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
/*jshint eqnull:true */
/*exported CFB */
/*global module, require:false, process:false, Buffer:false, Uint8Array:false */
/*::
declare var DO_NOT_EXPORT_CFB:?boolean;
type SectorEntry = {
name?:string;
nodes?:Array<number>;
data:RawBytes;
};
type SectorList = {
[k:string|number]:SectorEntry;
name:?string;
fat_addrs:Array<number>;
ssz:number;
}
type CFBFiles = {[n:string]:CFBEntry};
*/
/* [MS-CFB] v20130118 */
var CFB = (function _CFB(){
var exports/*:CFBModule*/ = /*::(*/{}/*:: :any)*/;
exports.version = '0.13.1';
/* [MS-CFB] 2.6.4 */
function namecmp(l/*:string*/, r/*:string*/)/*:number*/ {
var L = l.split("/"), R = r.split("/");
for(var i = 0, c = 0, Z = Math.min(L.length, R.length); i < Z; ++i) {
if((c = L[i].length - R[i].length)) return c;
if(L[i] != R[i]) return L[i] < R[i] ? -1 : 1;
}
return L.length - R.length;
}
function dirname(p/*:string*/)/*:string*/ {
if(p.charAt(p.length - 1) == "/") return (p.slice(0,-1).indexOf("/") === -1) ? p : dirname(p.slice(0, -1));
var c = p.lastIndexOf("/");
return (c === -1) ? p : p.slice(0, c+1);
}
function filename(p/*:string*/)/*:string*/ {
if(p.charAt(p.length - 1) == "/") return filename(p.slice(0, -1));
var c = p.lastIndexOf("/");
return (c === -1) ? p : p.slice(c+1);
}
function parse(file/*:RawBytes*/, options/*:CFBReadOpts*/)/*:CFBContainer*/ {
var mver = 3;
var ssz = 512;
var nmfs = 0; // number of mini FAT sectors
var difat_sec_cnt = 0;
var dir_start = 0;
var minifat_start = 0;
var difat_start = 0;
var fat_addrs/*:Array<number>*/ = []; // locations of FAT sectors
/* [MS-CFB] 2.2 Compound File Header */
var blob/*:CFBlob*/ = /*::(*/file.slice(0,512)/*:: :any)*/;
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 new Error("Major Version: Expected 3 or 4 saw " + mver);
}
/* reprocess header */
if(ssz !== 512) { blob = /*::(*/file.slice(0,ssz)/*:: :any)*/; prep_blob(blob, 28 /* blob.l */); }
/* Save header for final object */
var header/*:RawBytes*/ = file.slice(0,ssz);
check_shifts(blob, mver);
// Number of Directory Sectors
var dir_cnt/*:number*/ = blob.read_shift(4, 'i');
if(mver === 3 && dir_cnt !== 0) throw new Error('# Directory Sectors: Expected 0 saw ' + dir_cnt);
// Number of FAT Sectors
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
difat_sec_cnt = blob.read_shift(4, 'i');
// Grab FAT Sector Locations
for(var q = -1, 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/*:Array<RawBytes>*/ = sectorify(file, ssz);
sleuth_fat(difat_start, difat_sec_cnt, 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/*:CFBFiles*/ = {}, Paths/*:Array<string>*/ = [], FileIndex/*:CFBFileIndex*/ = [], FullPaths/*:Array<string>*/ = [], FullPathDir = {};
read_directory(dir_start, sector_list, sectors, Paths, nmfs, files, FileIndex);
build_full_paths(FileIndex, FullPathDir, FullPaths, Paths);
Paths.shift();
var o = {
FileIndex: FileIndex,
FullPaths: FullPaths,
FullPathDir: FullPathDir
};
// $FlowIgnore
if(options && options.raw) o.raw = {header: header, sectors: sectors};
return o;
} // parse
/* [MS-CFB] 2.2 Compound File Header -- read up to major version */
function check_get_mver(blob/*:CFBlob*/)/*:[number, number]*/ {
// header signature 8
blob.chk(HEADER_SIGNATURE, 'Header Signature: ');
// clsid 16
blob.chk(HEADER_CLSID, 'CLSID: ');
// minor version 2
var mver/*:number*/ = blob.read_shift(2, 'u');
return [blob.read_shift(2,'u'), mver];
}
function check_shifts(blob/*:CFBlob*/, mver/*:number*/)/*:void*/ {
var shift = 0x09;
// Byte Order
//blob.chk('feff', 'Byte Order: '); // note: some writers put 0xffff
blob.l += 2;
// Sector Shift
switch((shift = blob.read_shift(2))) {
case 0x09: if(mver != 3) throw new Error('Sector Shift: Expected 9 saw ' + shift); break;
case 0x0c: if(mver != 4) throw new Error('Sector Shift: Expected 12 saw ' + shift); break;
default: throw new Error('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/*:RawBytes*/, ssz/*:number*/)/*:Array<RawBytes>*/ {
var nsectors = Math.ceil(file.length/ssz)-1;
var sectors/*:Array<RawBytes>*/ = [];
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/*:CFBFileIndex*/, FPD/*:CFBFullPathDir*/, FP/*:Array<string>*/, Paths/*:Array<string>*/)/*:void*/ {
var i = 0, L = 0, R = 0, C = 0, j = 0, pl = Paths.length;
var dad/*:Array<number>*/ = [], q/*:Array<number>*/ = [];
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 && j !== dad[j]) {
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];
}
}
/** 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 bits */
function sleuth_fat(idx/*:number*/, cnt/*:number*/, sectors/*:Array<RawBytes>*/, ssz/*:number*/, fat_addrs)/*:void*/ {
var q/*:number*/ = ENDOFCHAIN;
if(idx === ENDOFCHAIN) {
if(cnt !== 0) throw new Error("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/*:Array<RawBytes>*/, start/*:number*/, fat_addrs/*:Array<number>*/, ssz/*:number*/, chkd/*:?Array<boolean>*/)/*:SectorEntry*/ {
var buf/*:Array<number>*/ = [], buf_chain/*:Array<any>*/ = [];
if(!chkd) chkd = [];
var modulus = ssz - 1, j = 0, jj = 0;
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 new Error("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/*:Array<RawBytes>*/, dir_start/*:number*/, fat_addrs/*:Array<number>*/, ssz/*:number*/)/*:SectorList*/ {
var sl = sectors.length, sector_list/*:SectorList*/ = ([]/*:any*/);
var chkd/*:Array<boolean>*/ = [], buf/*:Array<number>*/ = [], buf_chain/*:Array<RawBytes>*/ = [];
var modulus = ssz - 1, i=0, j=0, k=0, jj=0;
for(i=0; i < sl; ++i) {
buf = ([]/*:Array<number>*/);
k = (i + dir_start); if(k >= sl) k-=sl;
if(chkd[k]) continue;
buf_chain = [];
for(j=k; j>=0;) {
chkd[j] = true;
buf[buf.length] = j;
buf_chain.push(sectors[j]);
var addr/*:number*/ = fat_addrs[Math.floor(j*4/ssz)];
jj = ((j*4) & modulus);
if(ssz < 4 + jj) throw new Error("FAT boundary crossed: " + j + " 4 "+ssz);
if(!sectors[addr]) break;
j = __readInt32LE(sectors[addr], jj);
}
sector_list[k] = ({nodes: buf, data:__toBuffer([buf_chain])}/*:SectorEntry*/);
}
return sector_list;
}
/* [MS-CFB] 2.6.1 Compound File Directory Entry */
function read_directory(dir_start/*:number*/, sector_list/*:SectorList*/, sectors/*:Array<RawBytes>*/, Paths/*:Array<string>*/, nmfs, files, FileIndex) {
var minifat_store = 0, pl = (Paths.length?2:0);
var sector = sector_list[dir_start].data;
var i = 0, namelen = 0, name;
for(; i < sector.length; i+= 128) {
var blob/*:CFBlob*/ = /*::(*/sector.slice(i, i+128)/*:: :any)*/;
prep_blob(blob, 64);
namelen = blob.read_shift(2);
name = __utf16le(blob,0,namelen-pl);
Paths.push(name);
var o/*:CFBEntry*/ = ({
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'),
start: 0,
size: 0
});
var ctime/*:number*/ = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2);
if(ctime !== 0) o.ct = read_date(blob, blob.l-8);
var mtime/*:number*/ = blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2) + blob.read_shift(2);
if(mtime !== 0) o.mt = read_date(blob, blob.l-8);
o.start = blob.read_shift(4, 'i');
o.size = blob.read_shift(4, 'i');
if(o.size < 0 && o.start < 0) { o.size = o.type = 0; o.start = ENDOFCHAIN; o.name = ""; }
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)/*:any*/);
prep_blob(o.content, 0);
} else {
o.storage = 'minifat';
if(minifat_store !== ENDOFCHAIN && o.start !== ENDOFCHAIN && sector_list[minifat_store]) {
o.content = (sector_list[minifat_store].data.slice(o.start*MSSZ,o.start*MSSZ+o.size)/*:any*/);
prep_blob(o.content, 0);
}
}
files[name] = o;
FileIndex.push(o);
}
}
function read_date(blob/*:RawBytes|CFBlob*/, offset/*:number*/)/*:Date*/ {
return new Date(( ( (__readUInt32LE(blob,offset+4)/1e7)*Math.pow(2,32)+__readUInt32LE(blob,offset)/1e7 ) - 11644473600)*1000);
}
var fs/*:: = require('fs'); */;
function read_file(filename/*:string*/, options/*:CFBReadOpts*/) {
if(fs == null) fs = require('fs');
return parse(fs.readFileSync(filename), options);
}
function read(blob/*:RawBytes|string*/, options/*:CFBReadOpts*/) {
switch(options && options.type || "base64") {
case "file": /*:: if(typeof blob !== 'string') throw "Must pass a filename when type='file'"; */return read_file(blob, options);
case "base64": /*:: if(typeof blob !== 'string') throw "Must pass a base64-encoded binary string when type='file'"; */return parse(s2a(Base64.decode(blob)), options);
case "binary": /*:: if(typeof blob !== 'string') throw "Must pass a binary string when type='file'"; */return parse(s2a(blob), options);
}
return parse(/*::typeof blob == 'string' ? new Buffer(blob, 'utf-8') : */blob, options);
}
function init_cfb(cfb/*:CFBContainer*/, opts/*:?any*/)/*:void*/ {
var o = opts || {}, root = o.root || "Root Entry";
if(!cfb.FullPaths) cfb.FullPaths = [];
if(!cfb.FileIndex) cfb.FileIndex = [];
if(cfb.FullPaths.length !== cfb.FileIndex.length) throw new Error("inconsistent CFB structure");
if(cfb.FullPaths.length === 0) {
cfb.FullPaths[0] = root + "/";
cfb.FileIndex[0] = ({ name: root, type: 5 }/*:any*/);
}
if(o.CLSID) cfb.FileIndex[0].clsid = o.CLSID;
seed_cfb(cfb);
}
function seed_cfb(cfb/*:CFBContainer*/)/*:void*/ {
var nm = "\u0001Sh33tJ5";
if(CFB.find(cfb, "/" + nm)) return;
var p = new_buf(4); p[0] = 55; p[1] = p[3] = 50; p[2] = 54;
cfb.FileIndex.push(({ name: nm, type: 2, content:p, size:4, L:69, R:69, C:69 }/*:any*/));
cfb.FullPaths.push(cfb.FullPaths[0] + nm);
rebuild_cfb(cfb);
}
function rebuild_cfb(cfb/*:CFBContainer*/, f/*:?boolean*/)/*:void*/ {
init_cfb(cfb);
var gc = false, s = false;
for(var i = cfb.FullPaths.length - 1; i >= 0; --i) {
var _file = cfb.FileIndex[i];
switch(_file.type) {
case 0:
if(s) gc = true;
else { cfb.FileIndex.pop(); cfb.FullPaths.pop(); }
break;
case 1: case 2: case 5:
s = true;
if(isNaN(_file.R * _file.L * _file.C)) gc = true;
if(_file.R > -1 && _file.L > -1 && _file.R == _file.L) gc = true;
break;
default: gc = true; break;
}
}
if(!gc && !f) return;
var now = new Date(1987, 1, 19), j = 0;
var data/*:Array<[string, CFBEntry]>*/ = [];
for(i = 0; i < cfb.FullPaths.length; ++i) {
if(cfb.FileIndex[i].type === 0) continue;
data.push([cfb.FullPaths[i], cfb.FileIndex[i]]);
}
for(i = 0; i < data.length; ++i) {
var dad = dirname(data[i][0]);
s = false;
for(j = 0; j < data.length; ++j) if(data[j][0] === dad) s = true;
if(!s) data.push([dad, ({
name: filename(dad).replace("/",""),
type: 1,
clsid: HEADER_CLSID,
ct: now, mt: now,
content: null
}/*:any*/)]);
}
data.sort(function(x,y) { return namecmp(x[0], y[0]); });
cfb.FullPaths = []; cfb.FileIndex = [];
for(i = 0; i < data.length; ++i) { cfb.FullPaths[i] = data[i][0]; cfb.FileIndex[i] = data[i][1]; }
for(i = 0; i < data.length; ++i) {
var elt = cfb.FileIndex[i];
var nm = cfb.FullPaths[i];
elt.name = filename(nm).replace("/","");
elt.L = elt.R = elt.C = -(elt.color = 1);
elt.size = elt.content ? elt.content.length : 0;
elt.start = 0;
elt.clsid = (elt.clsid || HEADER_CLSID);
if(i === 0) {
elt.C = data.length > 1 ? 1 : -1;
elt.size = 0;
elt.type = 5;
} else if(nm.slice(-1) == "/") {
for(j=i+1;j < data.length; ++j) if(dirname(cfb.FullPaths[j])==nm) break;
elt.C = j >= data.length ? -1 : j;
for(j=i+1;j < data.length; ++j) if(dirname(cfb.FullPaths[j])==dirname(nm)) break;
elt.R = j >= data.length ? -1 : j;
elt.type = 1;
} else {
if(dirname(cfb.FullPaths[i+1]||"") == dirname(nm)) elt.R = i + 1;
elt.type = 2;
}
}
}
function _write(cfb/*:CFBContainer*/, options/*:CFBWriteOpts*/)/*:RawBytes*/ {
rebuild_cfb(cfb);
var L = (function(cfb/*:CFBContainer*/)/*:Array<number>*/{
var mini_size = 0, fat_size = 0;
for(var i = 0; i < cfb.FileIndex.length; ++i) {
var file = cfb.FileIndex[i];
if(!file.content) continue;
/*:: if(file.content == null) throw new Error("unreachable"); */
var flen = file.content.length;
if(flen === 0){}
else if(flen < 0x1000) mini_size += (flen + 0x3F) >> 6;
else fat_size += (flen + 0x01FF) >> 9;
}
var dir_cnt = (cfb.FullPaths.length +3) >> 2;
var mini_cnt = (mini_size + 7) >> 3;
var mfat_cnt = (mini_size + 0x7F) >> 7;
var fat_base = mini_cnt + fat_size + dir_cnt + mfat_cnt;
var fat_cnt = (fat_base + 0x7F) >> 7;
var difat_cnt = fat_cnt <= 109 ? 0 : Math.ceil((fat_cnt-109)/0x7F);
while(((fat_base + fat_cnt + difat_cnt + 0x7F) >> 7) > fat_cnt) difat_cnt = ++fat_cnt <= 109 ? 0 : Math.ceil((fat_cnt-109)/0x7F);
var L = [1, difat_cnt, fat_cnt, mfat_cnt, dir_cnt, fat_size, mini_size, 0];
cfb.FileIndex[0].size = mini_size << 6;
L[7] = (cfb.FileIndex[0].start=L[0]+L[1]+L[2]+L[3]+L[4]+L[5])+((L[6]+7) >> 3);
return L;
})(cfb);
var o = new_buf(L[7] << 9);
var i = 0, T = 0;
{
for(i = 0; i < 8; ++i) o.write_shift(1, HEADER_SIG[i]);
for(i = 0; i < 8; ++i) o.write_shift(2, 0);
o.write_shift(2, 0x003E);
o.write_shift(2, 0x0003);
o.write_shift(2, 0xFFFE);
o.write_shift(2, 0x0009);
o.write_shift(2, 0x0006);
for(i = 0; i < 3; ++i) o.write_shift(2, 0);
o.write_shift(4, 0);
o.write_shift(4, L[2]);
o.write_shift(4, L[0] + L[1] + L[2] + L[3] - 1);
o.write_shift(4, 0);
o.write_shift(4, 1<<12);
o.write_shift(4, L[3] ? L[0] + L[1] + L[2] - 1: ENDOFCHAIN);
o.write_shift(4, L[3]);
o.write_shift(-4, L[1] ? L[0] - 1: ENDOFCHAIN);
o.write_shift(4, L[1]);
for(i = 0; i < 109; ++i) o.write_shift(-4, i < L[2] ? L[1] + i : -1);
}
if(L[1]) {
for(T = 0; T < L[1]; ++T) {
for(; i < 236 + T * 127; ++i) o.write_shift(-4, i < L[2] ? L[1] + i : -1);
o.write_shift(-4, T === L[1] - 1 ? ENDOFCHAIN : T + 1);
}
}
var chainit = function(w/*:number*/)/*:void*/ {
for(T += w; i<T-1; ++i) o.write_shift(-4, i+1);
if(w) { ++i; o.write_shift(-4, ENDOFCHAIN); }
};
T = i = 0;
for(T+=L[1]; i<T; ++i) o.write_shift(-4, consts.DIFSECT);
for(T+=L[2]; i<T; ++i) o.write_shift(-4, consts.FATSECT);
chainit(L[3]);
chainit(L[4]);
var j/*:number*/ = 0, flen/*:number*/ = 0;
var file/*:CFBEntry*/ = cfb.FileIndex[0];
for(; j < cfb.FileIndex.length; ++j) {
file = cfb.FileIndex[j];
if(!file.content) continue;
/*:: if(file.content == null) throw new Error("unreachable"); */
flen = file.content.length;
if(flen < 0x1000) continue;
file.start = T;
chainit((flen + 0x01FF) >> 9);
}
chainit((L[6] + 7) >> 3);
while(o.l & 0x1FF) o.write_shift(-4, consts.ENDOFCHAIN);
T = i = 0;
for(j = 0; j < cfb.FileIndex.length; ++j) {
file = cfb.FileIndex[j];
if(!file.content) continue;
/*:: if(file.content == null) throw new Error("unreachable"); */
flen = file.content.length;
if(!flen || flen >= 0x1000) continue;
file.start = T;
chainit((flen + 0x3F) >> 6);
}
while(o.l & 0x1FF) o.write_shift(-4, consts.ENDOFCHAIN);
for(i = 0; i < L[4]<<2; ++i) {
var nm = cfb.FullPaths[i];
if(!nm || nm.length === 0) {
for(j = 0; j < 17; ++j) o.write_shift(4, 0);
for(j = 0; j < 3; ++j) o.write_shift(4, -1);
for(j = 0; j < 12; ++j) o.write_shift(4, 0);
continue;
}
file = cfb.FileIndex[i];
if(i === 0) file.start = file.size ? file.start - 1 : ENDOFCHAIN;
flen = 2*(file.name.length+1);
o.write_shift(64, file.name, "utf16le");
o.write_shift(2, flen);
o.write_shift(1, file.type);
o.write_shift(1, file.color);
o.write_shift(-4, file.L);
o.write_shift(-4, file.R);
o.write_shift(-4, file.C);
if(!file.clsid) for(j = 0; j < 4; ++j) o.write_shift(4, 0);
else o.write_shift(16, file.clsid, "hex");
o.write_shift(4, file.state || 0);
o.write_shift(4, 0); o.write_shift(4, 0);
o.write_shift(4, 0); o.write_shift(4, 0);
o.write_shift(4, file.start);
o.write_shift(4, file.size); o.write_shift(4, 0);
}
for(i = 1; i < cfb.FileIndex.length; ++i) {
file = cfb.FileIndex[i];
/*:: if(!file.content) throw new Error("unreachable"); */
if(file.size >= 0x1000) {
o.l = (file.start+1) << 9;
for(j = 0; j < file.size; ++j) o.write_shift(1, file.content[j]);
for(; j & 0x1FF; ++j) o.write_shift(1, 0);
}
}
for(i = 1; i < cfb.FileIndex.length; ++i) {
file = cfb.FileIndex[i];
/*:: if(!file.content) throw new Error("unreachable"); */
if(file.size > 0 && file.size < 0x1000) {
for(j = 0; j < file.size; ++j) o.write_shift(1, file.content[j]);
for(; j & 0x3F; ++j) o.write_shift(1, 0);
}
}
while(o.l < o.length) o.write_shift(1, 0);
return o;
}
/* [MS-CFB] 2.6.4 (Unicode 3.0.1 case conversion) */
function find(cfb/*:CFBContainer*/, path/*:string*/)/*:?CFBEntry*/ {
//return cfb.find(path);
var UCFullPaths/*:Array<string>*/ = cfb.FullPaths.map(function(x) { return x.toUpperCase(); });
var UCPaths/*:Array<string>*/ = UCFullPaths.map(function(x) { var y = x.split("/"); return y[y.length - (x.slice(-1) == "/" ? 2 : 1)]; });
var k/*:boolean*/ = false;
if(path.charCodeAt(0) === 47 /* "/" */) { k = true; path = UCFullPaths[0].slice(0, -1) + path; }
else k = path.indexOf("/") !== -1;
var UCPath/*:string*/ = path.toUpperCase();
var w/*:number*/ = k === true ? UCFullPaths.indexOf(UCPath) : UCPaths.indexOf(UCPath);
if(w !== -1) return cfb.FileIndex[w];
UCPath = UCPath.replace(chr0,'').replace(chr1,'!');
for(w = 0; w < UCFullPaths.length; ++w) {
if(UCFullPaths[w].replace(chr0,'').replace(chr1,'!') == UCPath) return cfb.FileIndex[w];
if(UCPaths[w].replace(chr0,'').replace(chr1,'!') == UCPath) return cfb.FileIndex[w];
}
return null;
}
/** 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_SIG = [0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1];
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']
};
function write_file(cfb/*:CFBContainer*/, filename/*:string*/, options/*:CFBWriteOpts*/)/*:void*/ {
var o = _write(cfb, options);
/*:: if(typeof Buffer == 'undefined' || !Buffer.isBuffer(o) || !(o instanceof Buffer)) throw new Error("unreachable"); */
fs.writeFileSync(filename, o);
}
function a2s(o/*:RawBytes*/)/*:string*/ {
var out = new Array(o.length);
for(var i = 0; i < o.length; ++i) out[i] = String.fromCharCode(o[i]);
return out.join("");
}
function write(cfb/*:CFBContainer*/, options/*:CFBWriteOpts*/)/*:RawBytes|string*/ {
var o = _write(cfb, options);
switch(options && options.type) {
case "file": fs.writeFileSync(options.filename, (o/*:any*/)); return o;
case "binary": return a2s(o);
case "base64": return Base64.encode(a2s(o));
}
return o;
}
function cfb_new(opts/*:?any*/)/*:CFBContainer*/ {
var o/*:CFBContainer*/ = ({}/*:any*/);
init_cfb(o, opts);
return o;
}
function cfb_add(cfb/*:CFBContainer*/, name/*:string*/, content/*:?RawBytes*/, opts/*:?any*/)/*:CFBEntry*/ {
init_cfb(cfb);
var file = CFB.find(cfb, name);
if(!file) {
var fpath = cfb.FullPaths[0];
if(name.slice(0, fpath.length) == fpath) fpath = name;
else {
if(fpath.slice(-1) != "/") fpath += "/";
fpath = (fpath + name).replace("//","/");
}
file = ({name: filename(name)}/*:any*/);
cfb.FileIndex.push(file);
cfb.FullPaths.push(fpath);
CFB.utils.cfb_gc(cfb);
}
/*:: if(!file) throw new Error("unreachable"); */
file.content = (content/*:any*/);
file.size = content ? content.length : 0;
if(opts) {
if(opts.CLSID) file.clsid = opts.CLSID;
}
return file;
}
function cfb_del(cfb/*:CFBContainer*/, name/*:string*/)/*:boolean*/ {
init_cfb(cfb);
var file = CFB.find(cfb, name);
if(file) for(var j = 0; j < cfb.FileIndex.length; ++j) if(cfb.FileIndex[j] == file) {
cfb.FileIndex.splice(j, 1);
cfb.FullPaths.splice(j, 1);
return true;
}
return false;
}
function cfb_mov(cfb/*:CFBContainer*/, old_name/*:string*/, new_name/*:string*/)/*:boolean*/ {
init_cfb(cfb);
var file = CFB.find(cfb, old_name);
if(file) for(var j = 0; j < cfb.FileIndex.length; ++j) if(cfb.FileIndex[j] == file) {
cfb.FileIndex[j].name = filename(new_name);
cfb.FullPaths[j] = new_name;
return true;
}
return false;
}
function cfb_gc(cfb/*:CFBContainer*/)/*:void*/ { rebuild_cfb(cfb, true); }
exports.find = find;
exports.read = read;
exports.parse = parse;
exports.write = write;
exports.writeFile = write_file;
exports.utils = {
cfb_new: cfb_new,
cfb_add: cfb_add,
cfb_del: cfb_del,
cfb_mov: cfb_mov,
cfb_gc: cfb_gc,
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; }
Reference in New Issue View Git Blame Copy Permalink