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Generate ZIP files the same way as Windows

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This commit is contained in:
Justine Tunney 2021-03-01 06:24:11 -08:00
parent d932948fb4
commit f4298f10c2
11 changed files with 112 additions and 43 deletions
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25
libc/zipos/get.c
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@ -21,6 +21,7 @@
#include "libc/calls/struct/stat.h"
#include "libc/limits.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
@ -36,9 +37,8 @@ struct Zipos *__zipos_get(void) {
static bool once;
const char *exe, *dir;
char path[PATH_MAX];
size_t mapsize;
uint8_t *cdir;
void *map;
size_t size;
uint8_t *map, *base, *cdir;
if (!once) {
dir = nulltoempty(getenv("PWD")); /* suboptimal */
exe = (const char *)getauxval(AT_EXECFN);
@ -47,14 +47,23 @@ struct Zipos *__zipos_get(void) {
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)) !=
if ((size = getfiledescriptorsize(zipos.fd)) != SIZE_MAX &&
(map = mmap(NULL, size, PROT_READ, MAP_SHARED, zipos.fd, 0)) !=
MAP_FAILED) {
if ((cdir = zipfindcentraldir(map, mapsize))) {
zipos.map = map;
if (endswith(exe, ".com.dbg")) {
if ((base = memmem(map, size, "MZqFpD", 6))) {
size -= base - map;
} else {
base = map;
}
} else {
base = map;
}
if ((cdir = zipfindcentraldir(base, size))) {
zipos.map = base;
zipos.cdir = cdir;
} else {
munmap(map, mapsize);
munmap(map, size);
}
}
}