35 lines
2.3 KiB
C
35 lines
2.3 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 2020 Justine Alexandra Roberts Tunney │
|
||
|
|
│ │
|
||
|
|
│ This program is free software; you can redistribute it and/or modify │
|
||
|
|
│ it under the terms of the GNU General Public License as published by │
|
||
|
|
│ the Free Software Foundation; version 2 of the License. │
|
||
|
|
│ │
|
||
|
|
│ This program is distributed in the hope that it will be useful, but │
|
||
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
||
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
||
|
|
│ General Public License for more details. │
|
||
|
|
│ │
|
||
|
|
│ You should have received a copy of the GNU General Public License │
|
||
|
|
│ along with this program; if not, write to the Free Software │
|
||
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
||
|
|
│ 02110-1301 USA │
|
||
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
|
|
#include "libc/zip.h"
|
||
|
|
|
||
|
|
uint8_t *zipfindcentraldir(const uint8_t *map, size_t mapsize) {
|
||
|
|
const uint8_t *p, *pe;
|
||
|
|
for (p = map + mapsize - kZipCdirHdrMinSize,
|
||
|
|
pe = mapsize > 65536 + kZipCdirHdrMinSize
|
||
|
|
? map + mapsize - 65536 - kZipCdirHdrMinSize
|
||
|
|
: map;
|
||
|
|
p >= pe; --p) {
|
||
|
|
if (ZIP_CDIR_MAGIC(p) == kZipCdirHdrMagic) {
|
||
|
|
return (/*unconst*/ uint8_t *)p;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|