SheetJS
1a428c8f5b
- sector checked before reading (h/t @e12009) See https://github.com/SheetJS/js-xlsx/issues/569 - flow type checking
60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
/* [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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}/*:any*/);
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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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