mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
559b024e1d
We can now link even smaller Python binaries. For example, the hello.com program in the Python build directory is a compiled linked executable of hello.py which just prints hello world. Using decentralized sections, we can make that binary 1.9mb in size (noting that python.com is 6.3 megs!) This works for nontrivial programs too. For example, say we want an APE binary that's equivalent to python.com -m http.server. Our makefile now builds such a binary using the new launcher and it's only 3.2mb in size since Python sources get turned into ELF objects, which tell our linker that we need things like native hashing algorithm code.
55 lines
3 KiB
C
55 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/zip.h"
|
|
|
|
/**
|
|
* Locates End Of Central Directory record in ZIP file.
|
|
*
|
|
* The ZIP spec says this header can be anywhere in the last 64kb. We
|
|
* search it backwards for the ZIP-64 "PK♠•" magic number. If that's not
|
|
* found, then we search again for the original "PK♣♠" magnum. The
|
|
* caller needs to check the first four bytes of the returned value to
|
|
* determine whether to use ZIP_CDIR_xxx() or ZIP_CDIR64_xxx() macros.
|
|
*
|
|
* @param p points to file memory
|
|
* @param n is byte size of file
|
|
* @return pointer to EOCD64 or EOCD, or NULL if not found
|
|
*/
|
|
void *GetZipCdir(const uint8_t *p, size_t n) {
|
|
size_t i, j;
|
|
i = n - 4;
|
|
do {
|
|
if (READ32LE(p + i) == kZipCdir64LocatorMagic &&
|
|
i + kZipCdir64LocatorSize <= n &&
|
|
IsZipCdir64(p, n, ZIP_LOCATE64_OFFSET(p + i))) {
|
|
return p + ZIP_LOCATE64_OFFSET(p + i);
|
|
} else if (READ32LE(p + i) == kZipCdirHdrMagic && IsZipCdir32(p, n, i)) {
|
|
j = i;
|
|
do {
|
|
if (READ32LE(p + j) == kZipCdir64LocatorMagic &&
|
|
j + kZipCdir64LocatorSize <= n &&
|
|
IsZipCdir64(p, n, ZIP_LOCATE64_OFFSET(p + j))) {
|
|
return p + ZIP_LOCATE64_OFFSET(p + j);
|
|
}
|
|
} while (j-- && i - j < 128);
|
|
return p + i;
|
|
}
|
|
} while (i--);
|
|
return 0;
|
|
}
|