mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
4a59210008
This change improves the way internal APIs are being hidden behind the `COSMO` define. The cosmo.h header will take care of defining that, so that a separate define statement isn't needed. This change also does a lot more to define which APIs are standard, and which belong to Cosmo.
102 lines
5 KiB
C
102 lines
5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/conv.h"
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#include "libc/zip.internal.h"
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static inline int pop(int x) {
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return !!(x & 1) + !!(x & 2) + !!(x & 4);
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}
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/**
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* Extracts modified/access/creation timestamps from zip entry.
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*
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* @param cf is pointer to central directory header for file
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* @param mtim optionally receives last modified timestamp
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* @param atim optionally receives modified timestamp
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* @param ctim optionally receives creation timestamp
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* @param gmtoff is seconds adjustment for legacy dos timestamps
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*/
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void GetZipCfileTimestamps(const uint8_t *cf, struct timespec *mtim,
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struct timespec *atim, struct timespec *ctim,
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int gmtoff) {
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const uint8_t *p, *pe;
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if (mtim) *mtim = (struct timespec){0};
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if (atim) *atim = (struct timespec){0};
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if (ctim) *ctim = (struct timespec){0};
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for (p = ZIP_CFILE_EXTRA(cf), pe = p + ZIP_CFILE_EXTRASIZE(cf); p + 4 <= pe;
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p += ZIP_EXTRA_SIZE(p)) {
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if (ZIP_EXTRA_HEADERID(p) == kZipExtraNtfs &&
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ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 &&
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READ16LE(ZIP_EXTRA_CONTENT(p) + 4) == 1 &&
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READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 8) {
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if (mtim) {
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*mtim = WindowsTimeToTimeSpec(READ64LE(ZIP_EXTRA_CONTENT(p) + 8));
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}
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if (atim && ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 * 2 &&
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READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 16) {
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*atim = WindowsTimeToTimeSpec(READ64LE(ZIP_EXTRA_CONTENT(p) + 8 * 2));
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}
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if (ctim && ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4 + 8 * 3 &&
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READ16LE(ZIP_EXTRA_CONTENT(p) + 6) >= 24) {
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*ctim = WindowsTimeToTimeSpec(READ64LE(ZIP_EXTRA_CONTENT(p) + 8 * 3));
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}
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return;
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}
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}
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for (p = ZIP_CFILE_EXTRA(cf), pe = p + ZIP_CFILE_EXTRASIZE(cf); p + 4 <= pe;
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p += ZIP_EXTRA_SIZE(p)) {
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if (ZIP_EXTRA_HEADERID(p) == kZipExtraExtendedTimestamp &&
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ZIP_EXTRA_CONTENTSIZE(p) > 1 &&
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ZIP_EXTRA_CONTENTSIZE(p) == 1 + 4 * pop(*ZIP_EXTRA_CONTENT(p) & 7)) {
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if (mtim) {
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if (*ZIP_EXTRA_CONTENT(p) & 1) {
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mtim->tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 1);
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} else {
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mtim->tv_sec = DosDateTimeToUnix(ZIP_CFILE_LASTMODIFIEDDATE(cf),
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ZIP_CFILE_LASTMODIFIEDTIME(cf)) -
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gmtoff;
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}
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}
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if (atim && (*ZIP_EXTRA_CONTENT(p) & 2)) {
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atim->tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 1 +
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4 * (*ZIP_EXTRA_CONTENT(p) & 1));
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}
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if (ctim && (*ZIP_EXTRA_CONTENT(p) & 4)) {
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ctim->tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 1 +
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4 * pop(*ZIP_EXTRA_CONTENT(p) & 3));
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}
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return;
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}
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}
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for (p = ZIP_CFILE_EXTRA(cf), pe = p + ZIP_CFILE_EXTRASIZE(cf); p + 4 <= pe;
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p += ZIP_EXTRA_SIZE(p)) {
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if (ZIP_EXTRA_HEADERID(p) == kZipExtraUnix &&
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ZIP_EXTRA_CONTENTSIZE(p) >= 4 + 4) {
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if (atim) atim->tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 0);
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if (mtim) mtim->tv_sec = (int32_t)READ32LE(ZIP_EXTRA_CONTENT(p) + 4);
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return;
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}
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}
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if (mtim) {
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mtim->tv_sec = DosDateTimeToUnix(ZIP_CFILE_LASTMODIFIEDDATE(cf),
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ZIP_CFILE_LASTMODIFIEDTIME(cf)) -
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gmtoff;
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}
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}
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