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Merge pull request #34 from andrebrait/patch-2

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Add more details on how to parse the remainders
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Jeff Schiller 2022-03-05 09:29:57 -08:00 • committed by GitHub
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1 changed files with 24 additions and 7 deletions
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@ -190,6 +190,10 @@ Packed Data (Total Packed Size) bytes
<ul>
<li>4 bytes containing an MS-DOS date/time (except for mtime, which is part of FILE_HEAD)</li>
<li>0 to 3 bytes containing fractions of seconds in 100ns increments</li>
<ul>
<li>They form a 24-bit integer, sorted from least significant to most significant bits</li>
<li>If fewer than 3 bytes are present, the remaining least significant bits are to be padded with zeroes in order to complete 24-bits</li>
</ul>
</ul>
<p>Follow the following pseudo-code to read in the ExtTime Structure.</p>
@ -202,31 +206,43 @@ var extTimeFlags = readBits(16)
mtime_rmode = extTimeFlags >> 12
if ((mtime_rmode & 8)==0) goto ctime
mtime_count = mtime_rmode & 0x3
mtime_remainder = readBits(8*mtime_count);
mtime_remainder = 0
for (var i = 0; i < mtime_count; i++) {
mtime_remainder = (readBits(8) << 16) | (mtime_remainder >> 8)
}
if ((mtime_rmode & 4)!=0) mtime_remainder += one_second
<b>ctime:</b>
ctime_rmode = extTimeFlags >> 8
if ((ctime_rmode & 8)==0) goto atime
Set ctime to readBits(32)
ctime = readBits(32)
ctime_count = ctime_rmode & 0x3
ctime_remainder = readBits(8*ctime_count)
ctime_remainder = 0
for (var i = 0; i < ctime_count; i++) {
ctime_remainder = (readBits(8) << 16) | (ctime_remainder >> 8)
}
if ((ctime_rmode & 4)!=0) ctime_remainder += one_second
<b>atime:</b>
atime_rmode = extTimeFlags >> 4
if ((atime_rmode & 8)==0) goto arctime
Set atime to readBits(32)
atime = readBits(32)
atime_count = atime_rmode & 0x3
atime_remainder = readBits(8*atime_count)
atime_remainder = 0
for (var i = 0; i < atime_count; i++) {
atime_remainder = (readBits(8) << 16) | (atime_remainder >> 8)
}
if ((atime_rmode & 4)!=0) atime_remainder += one_second
<b>arctime:</b>
arctime_rmode = extTimeFlags
if ((arctime_rmode & 8)==0) goto done_exttime
Set arctime to readBits(32)
arctime = readBits(32)
arctime_count = arctime_rmode & 0x3
arctime_remainder = readBits(8*arctime_count)
arctime_remainder = 0
for (var i = 0; i < arctime_count; i++) {
arctime_remainder = (readBits(8) << 16) | (arctime_remainder >> 8)
}
if ((arctime_rmode & 4)!=0) arctime_remainder += one_second
<b>done_exttime</b>
@ -575,6 +591,7 @@ ZeroCount 4 bits (only present if BitLength is 15)
<ul>
<li>Eugene Roshal &lt;roshal@rarlab.com&gt; - creator and owner of the RAR format</li>
<li>Jeff Schiller &lt;codedread@gmail.com&gt; - creator of this document as part of the <a href="http://github.com/codedread/bitjs/">bitjs</a> project</li>
<li>Andre Brait &lt;andrebrait@gmail.com&gt; - for documenting the ExtTime structure</li>
</ul>
</section>