jiapengyu
75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
export function dateToDos(d, forceLocalTime) {
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forceLocalTime = forceLocalTime || false;
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var year = forceLocalTime ? d.getFullYear() : d.getUTCFullYear();
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if (year < 1980) {
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return 2162688; // 1980-1-1 00:00:00
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} else if (year >= 2044) {
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return 2141175677; // 2043-12-31 23:59:58
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}
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var val = {
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year: year,
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month: forceLocalTime ? d.getMonth() : d.getUTCMonth(),
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date: forceLocalTime ? d.getDate() : d.getUTCDate(),
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hours: forceLocalTime ? d.getHours() : d.getUTCHours(),
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minutes: forceLocalTime ? d.getMinutes() : d.getUTCMinutes(),
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seconds: forceLocalTime ? d.getSeconds() : d.getUTCSeconds(),
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};
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return (
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((val.year - 1980) << 25) |
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((val.month + 1) << 21) |
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(val.date << 16) |
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(val.hours << 11) |
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(val.minutes << 5) |
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(val.seconds / 2)
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);
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}
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export function dosToDate(dos) {
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return new Date(
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((dos >> 25) & 0x7f) + 1980,
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((dos >> 21) & 0x0f) - 1,
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(dos >> 16) & 0x1f,
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(dos >> 11) & 0x1f,
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(dos >> 5) & 0x3f,
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(dos & 0x1f) << 1,
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);
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}
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export function fromDosTime(buf) {
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return dosToDate(buf.readUInt32LE(0));
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}
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export function getEightBytes(v) {
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var buf = Buffer.alloc(8);
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buf.writeUInt32LE(v % 0x0100000000, 0);
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buf.writeUInt32LE((v / 0x0100000000) | 0, 4);
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return buf;
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}
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export function getShortBytes(v) {
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var buf = Buffer.alloc(2);
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buf.writeUInt16LE((v & 0xffff) >>> 0, 0);
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return buf;
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}
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export function getShortBytesValue(buf, offset) {
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return buf.readUInt16LE(offset);
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}
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export function getLongBytes(v) {
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var buf = Buffer.alloc(4);
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buf.writeUInt32LE((v & 0xffffffff) >>> 0, 0);
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return buf;
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}
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export function getLongBytesValue(buf, offset) {
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return buf.readUInt32LE(offset);
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}
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export function toDosTime(d) {
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return getLongBytes(util.dateToDos(d));
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}
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export default {
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dateToDos,
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dosToDate,
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fromDosTime,
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getEightBytes,
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getShortBytes,
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getShortBytesValue,
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getLongBytes,
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getLongBytesValue,
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toDosTime,
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};
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