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Refactor out some duplicated code

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This commit is contained in:
Justine Tunney 2021-08-14 06:17:56 -07:00
parent e963d9c8e3
commit 579b597ded
58 changed files with 1110 additions and 3214 deletions
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66
libc/zipos/stat-impl.c
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@ -18,75 +18,12 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/fmt/conv.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
#include "libc/zip.h"
#include "libc/zipos/zipos.internal.h"
static int popcnt3(int x) {
return !!(x & 1) + !!(x & 2) + !!(x & 4);
}
static struct timespec WindowsTimeToTime(uint64_t x) {
return (struct timespec){x / HECTONANOSECONDS - MODERNITYSECONDS,
x % HECTONANOSECONDS * 100};
}
static void GetZipCfileTimestamps(const uint8_t *zcf, struct stat *st) {
const uint8_t *p, *pe;
for (p = ZIP_CFILE_EXTRA(zcf), pe = p + ZIP_CFILE_EXTRASIZE(zcf); p + 4 <= pe;
p += ZIP_EXTRA_SIZE(p)) {
if (ZIP_EXTRA_HEADERID(p) == kZipExtraNtfs &&
ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 &&
READ16LE(ZIP_EXTRA_CONTENT(p) + 4) == 1 &&
READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 8) {
st->st_mtim = WindowsTimeToTime(READ64LE(ZIP_EXTRA_CONTENT(p) + 8));
if (ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 * 2 &&
READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 16) {
st->st_atim = WindowsTimeToTime(READ64LE(ZIP_EXTRA_CONTENT(p) + 8 * 2));
}
if (ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 * 3 &&
READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 24) {
st->st_ctim = WindowsTimeToTime(READ64LE(ZIP_EXTRA_CONTENT(p) + 8 * 3));
}
return;
}
}
for (p = ZIP_CFILE_EXTRA(zcf), pe = p + ZIP_CFILE_EXTRASIZE(zcf); p + 4 <= pe;
p += ZIP_EXTRA_SIZE(p)) {
if (ZIP_EXTRA_HEADERID(p) == kZipExtraExtendedTimestamp &&
ZIP_EXTRA_CONTENTSIZE(p) > 1 &&
ZIP_EXTRA_CONTENTSIZE(p) ==
1 + 4 * popcnt3(*ZIP_EXTRA_CONTENT(p) & 7)) {
if (*ZIP_EXTRA_CONTENT(p) & 1) {
st->st_mtim.tv_sec = READ32LE(ZIP_EXTRA_CONTENT(p) + 1);
}
if (*ZIP_EXTRA_CONTENT(p) & 2) {
st->st_atim.tv_sec = READ32LE(ZIP_EXTRA_CONTENT(p) + 1 +
4 * (*ZIP_EXTRA_CONTENT(p) & 1));
}
if (*ZIP_EXTRA_CONTENT(p) & 4) {
st->st_ctim.tv_sec = READ32LE(ZIP_EXTRA_CONTENT(p) + 1 +
4 * popcnt3(*ZIP_EXTRA_CONTENT(p) & 3));
}
return;
}
}
for (p = ZIP_CFILE_EXTRA(zcf), pe = p + ZIP_CFILE_EXTRASIZE(zcf); p + 4 <= pe;
p += ZIP_EXTRA_SIZE(p)) {
if (ZIP_EXTRA_HEADERID(p) == kZipExtraUnix &&
ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4) {
st->st_atim.tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 0);
st->st_mtim.tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 4);
return;
}
}
st->st_mtim.tv_sec = DosDateTimeToUnix(ZIP_CFILE_LASTMODIFIEDDATE(zcf),
ZIP_CFILE_LASTMODIFIEDTIME(zcf));
}
int __zipos_stat_impl(struct Zipos *zipos, size_t cf, struct stat *st) {
size_t lf;
if (zipos && st) {
@ -100,7 +37,8 @@ int __zipos_stat_impl(struct Zipos *zipos, size_t cf, struct stat *st) {
st->st_size = GetZipLfileUncompressedSize(zipos->map + lf);
st->st_blocks =
roundup(GetZipLfileCompressedSize(zipos->map + lf), 512) / 512;
GetZipCfileTimestamps(zipos->map + cf, st);
GetZipCfileTimestamps(zipos->map + cf, &st->st_mtim, &st->st_atim,
&st->st_ctim, 0);
return 0;
} else {
return einval();