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[zip] Set all entry times before 1980 to 1980-01-01

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Before this change, entry times before 1980 had the year changed to 1980
but the month/day/hour/minutes/seconds were all kept as-is.

Bug: 277978832
Test: atest zipalign_tests
Change-Id: I9f87e98a6b985002578490b87c654fee86c65d62
This commit is contained in:
Mark Punzalan 2023-09-06 21:32:07 +00:00
parent 2462269f1f
commit 0d7190b413
1 changed files with 15 additions and 6 deletions
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21
tools/zipalign/ZipEntry.cpp
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@ -363,13 +363,22 @@ void ZipEntry::setModWhen(time_t when)
struct tm tmResult;
struct tm* ptm = localtime_r(&even, &tmResult);
int year;
year = ptm->tm_year;
if (year < 80)
year = 80;
// The earliest valid time for ZIP file entries is 1980-01-01. See:
// https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip.html.
// Set any time before 1980 to 1980-01-01.
if (ptm->tm_year < 80) {
ptm->tm_year = 80;
ptm->tm_mon = 0;
ptm->tm_mday = 1;
ptm->tm_hour = 0;
ptm->tm_min = 0;
ptm->tm_sec = 0;
}
uint16_t zdate = (year - 80) << 9 | (ptm->tm_mon+1) << 5 | ptm->tm_mday;
uint16_t ztime = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
uint16_t zdate = static_cast<uint16_t>(
(ptm->tm_year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday);
uint16_t ztime = static_cast<uint16_t>(
ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1);
mCDE.mLastModFileTime = mLFH.mLastModFileTime = ztime;
mCDE.mLastModFileDate = mLFH.mLastModFileDate = zdate;