39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
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/* -------------------------------------------------------------------------- */
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/* DOS Date format:
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high|YYYYYYYm.mmmddddd.HHHHHMMM.MMMSSSSS|low
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add 1980 to stored year
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stored second should be doubled
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*/
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/* write JS date to buf as a DOS date */
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function write_dos_date(buf/*:CFBlob*/, date/*:Date|string*/) {
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if(typeof date === "string") date = new Date(date);
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var hms/*:number*/ = date.getHours();
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hms = hms << 6 | date.getMinutes();
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hms = hms << 5 | (date.getSeconds()>>>1);
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buf.write_shift(2, hms);
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var ymd/*:number*/ = (date.getFullYear() - 1980);
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ymd = ymd << 4 | (date.getMonth()+1);
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ymd = ymd << 5 | date.getDate();
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buf.write_shift(2, ymd);
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}
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/* read four bytes from buf and interpret as a DOS date */
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function parse_dos_date(buf/*:CFBlob*/)/*:Date*/ {
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var hms = buf.read_shift(2) & 0xFFFF;
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var ymd = buf.read_shift(2) & 0xFFFF;
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var val = new Date();
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var d = ymd & 0x1F; ymd >>>= 5;
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var m = ymd & 0x0F; ymd >>>= 4;
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val.setMilliseconds(0);
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val.setFullYear(ymd + 1980);
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val.setMonth(m-1);
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val.setDate(d);
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var S = hms & 0x1F; hms >>>= 5;
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var M = hms & 0x3F; hms >>>= 6;
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val.setHours(hms);
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val.setMinutes(M);
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val.setSeconds(S<<1);
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return val;
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}
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