cosmopolitan/libc/zipos/find.c

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2020-06-15 14:18:57 +00:00
/*-*- 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 "ape/relocations.h"
#include "libc/assert.h"
#include "libc/runtime/rbx.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/zip.h"
#include "libc/zipos/zipos.h"
ssize_t __zipos_find(const struct ZiposUri *name) {
size_t i, cf;
assert(ZIP_CDIR_MAGIC(__zip_end) == kZipCdirHdrMagic);
for (i = 0, cf = ZIP_CDIR_OFFSET(__zip_end); i < ZIP_CDIR_RECORDS(__zip_end);
++i, cf += ZIP_CFILE_HDRSIZE(&_base[0] + cf)) {
assert(ZIP_CFILE_MAGIC(&_base[0] + cf) == kZipCfileHdrMagic);
if (name->len == ZIP_CFILE_NAMESIZE(&_base[0] + cf) &&
memcmp(name->path, ZIP_CFILE_NAME(&_base[0] + cf), name->len) == 0) {
return cf;
}
}
return -1;
}