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https://github.com/jart/cosmopolitan.git
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43 lines
2.5 KiB
C
43 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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 compressed size in bytes from zip central directory header.
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*/
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int64_t GetZipCfileCompressedSize(const uint8_t *z) {
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if (ZIP_CFILE_COMPRESSEDSIZE(z) != 0xFFFFFFFFu) {
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return ZIP_CFILE_COMPRESSEDSIZE(z);
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}
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const uint8_t *p = ZIP_CFILE_EXTRA(z);
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const uint8_t *pe = p + ZIP_CFILE_EXTRASIZE(z);
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for (; p + ZIP_EXTRA_SIZE(p) <= pe; p += ZIP_EXTRA_SIZE(p)) {
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if (ZIP_EXTRA_HEADERID(p) == kZipExtraZip64) {
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int offset = 0;
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if (ZIP_CFILE_UNCOMPRESSEDSIZE(z) == 0xFFFFFFFFu) {
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offset += 8;
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}
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if (offset + 8 <= ZIP_EXTRA_CONTENTSIZE(p)) {
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return ZIP_READ64(ZIP_EXTRA_CONTENT(p) + offset);
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}
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}
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}
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return -1;
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}
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