34 lines
804 B
JavaScript
34 lines
804 B
JavaScript
/* [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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blob.l += 2;
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return blob.read_shift(2,'u');
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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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