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Fix redbean zip central directory lookup

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This regression snuck in at some point. It resulted in the program
sometimes failing to load when the zip content was changed.
This commit is contained in:
Justine Tunney 2021-02-27 10:47:19 -08:00
parent 19d0c15e03
commit 218ef49147
10 changed files with 183 additions and 11 deletions
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9
libc/zipos/get.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/limits.h"
@ -33,12 +34,18 @@
struct Zipos *__zipos_get(void) {
static struct Zipos zipos;
static bool once;
const char *exe;
const char *exe, *dir;
char path[PATH_MAX];
size_t mapsize;
uint8_t *cdir;
void *map;
if (!once) {
dir = nulltoempty(getenv("PWD")); /* suboptimal */
exe = (const char *)getauxval(AT_EXECFN);
if (!fileexists(exe) && strlen(dir) + 1 + strlen(exe) + 1 <= PATH_MAX) {
stpcpy(stpcpy(stpcpy(path, dir), "/"), exe);
exe = path;
}
if ((zipos.fd = open(exe, O_RDONLY)) != -1) {
if ((mapsize = getfiledescriptorsize(zipos.fd)) != SIZE_MAX &&
(map = mmap(NULL, mapsize, PROT_READ, MAP_SHARED, zipos.fd, 0)) !=