mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +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.
49 lines
2.7 KiB
C
49 lines
2.7 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/zip.internal.h"
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/**
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* Returns kZipOk if zip64 end of central directory header seems legit.
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*/
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int IsZipEocd64(const uint8_t *p, size_t n, size_t i) {
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if (i + kZipCdir64HdrMinSize > n) {
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return kZipErrorEocdOffsetOverflow;
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}
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if (READ32LE(p + i) != kZipCdir64HdrMagic) {
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return kZipErrorEocdMagicNotFound;
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}
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if (i + ZIP_CDIR64_HDRSIZE(p + i) + kZipCdir64LocatorSize > n) {
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return kZipErrorEocdSizeOverflow;
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}
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if (ZIP_LOCATE64_MAGIC(p + i + ZIP_CDIR64_HDRSIZE(p + i)) !=
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kZipCdir64LocatorMagic) {
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return kZipErrorCdirLocatorMagic;
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}
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if (ZIP_LOCATE64_OFFSET(p + i + ZIP_CDIR64_HDRSIZE(p + i)) != i) {
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return kZipErrorCdirLocatorOffset;
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}
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if (ZIP_CDIR64_RECORDS(p + i) * kZipCfileHdrMinSize >
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ZIP_CDIR64_SIZE(p + i)) {
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return kZipErrorCdirRecordsOverflow;
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}
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if (ZIP_CDIR64_OFFSET(p + i) + ZIP_CDIR64_SIZE(p + i) > i) {
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return kZipErrorCdirOffsetPastEocd;
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}
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return kZipOk;
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}
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