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https://github.com/jart/cosmopolitan.git
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8ff48201ca
This change takes an entirely new approach to the incremental linking of pkzip executables. The assets created by zipobj.com are now treated like debug data. After a .com.dbg is compiled, fixupobj.com should be run, so it can apply fixups to the offsets and move the zip directory to the end of the file. Since debug data doesn't get objcopy'd, a new tool has been introduced called zipcopy.com which should be run after objcopy whenever a .com file is created. This is all automated by the `cosmocc` toolchain which is rapidly becoming the new recommended approach. This change also introduces the new C23 checked arithmetic macros.
88 lines
4.3 KiB
C
88 lines
4.3 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/intrin/bits.h"
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#include "libc/zip.internal.h"
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typedef char v16qi __attribute__((__vector_size__(16)));
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typedef short v8hi __attribute__((__vector_size__(16)));
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typedef long long v2di __attribute__((__vector_size__(16), __aligned__(1)));
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/**
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* Locates End Of Central Directory record in ZIP file.
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*
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* The ZIP spec says this header can be anywhere in the last 64kb. We
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* search it backwards for the ZIP-64 "PK♠•" magic number. If that's not
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* found, then we search again for the original "PK♣♠" magnum. The
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* caller needs to check the first four bytes of the returned value to
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* determine whether to use ZIP_CDIR_xxx() or ZIP_CDIR64_xxx() macros.
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*
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* @param f points to file memory
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* @param n is byte size of file
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* @param e may receive error code when null is returned
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* @return pointer to EOCD64 or EOCD, otherwise null
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*/
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void *GetZipEocd(const void *f, size_t n, int *e) {
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v2di x;
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int err;
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size_t i, j;
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uint32_t magic;
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const uint8_t *p;
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p = f;
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i = n - 4;
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err = kZipErrorEocdNotFound;
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do {
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#ifdef __x86_64__
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v8hi pk = {READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK"),
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READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK")};
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asm("" : "+x"(pk));
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if (i >= 14) {
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x = *(const v2di *)(p + i - 14);
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if (!(__builtin_ia32_pmovmskb128(
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(v16qi)__builtin_ia32_pcmpeqw128((v8hi)x, pk)) |
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__builtin_ia32_pmovmskb128((v16qi)__builtin_ia32_pcmpeqw128(
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(v8hi)__builtin_ia32_psrldqi128(x, 8), pk)))) {
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i -= 13;
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continue;
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}
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}
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#endif
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while (magic = READ32LE(p + i), magic != kZipCdir64LocatorMagic &&
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magic != kZipCdirHdrMagic &&
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i + 0x10000 + 0x1000 >= n && i > 0) {
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--i;
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}
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if (magic == kZipCdir64LocatorMagic && i + kZipCdir64LocatorSize <= n &&
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(err = IsZipEocd64(p, n, ZIP_LOCATE64_OFFSET(p + i))) == kZipOk) {
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return p + ZIP_LOCATE64_OFFSET(p + i);
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} else if (magic == kZipCdirHdrMagic &&
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(err = IsZipEocd32(p, n, i)) == kZipOk) {
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j = i;
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do {
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if (READ32LE(p + j) == kZipCdir64LocatorMagic &&
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j + kZipCdir64LocatorSize <= n &&
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IsZipEocd64(p, n, ZIP_LOCATE64_OFFSET(p + j)) == kZipOk) {
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return p + ZIP_LOCATE64_OFFSET(p + j);
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}
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} while (j-- && i - j < 128);
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return p + i;
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}
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} while (i > 0 && i-- + 0x10000 + 0x1000 >= n);
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if (e) *e = err;
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return 0;
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}
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