cosmopolitan/libc/runtime/zipos-stat-impl.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 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/calls/internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/runtime/zipos.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/s.h"
#include "libc/zip.internal.h"

int __zipos_stat_impl(struct Zipos *zipos, size_t cf, struct stat *st) {
  size_t lf;
  bzero(st, sizeof(*st));
  st->st_nlink = 1;
  st->st_dev = zipos->dev;
  st->st_blksize = FRAMESIZE;
  if (cf == ZIPOS_SYNTHETIC_DIRECTORY) {
    st->st_mode = S_IFDIR | (0555 & ~atomic_load_explicit(
                                        &__umask, memory_order_acquire));
  } else {
    lf = GetZipCfileOffset(zipos->map + cf);
    st->st_mode = GetZipCfileMode(zipos->map + cf);
    st->st_size = GetZipLfileUncompressedSize(zipos->map + lf);
    st->st_blocks =
        roundup(GetZipLfileCompressedSize(zipos->map + lf), 512) / 512;
    GetZipCfileTimestamps(zipos->map + cf, &st->st_mtim, &st->st_atim,
                          &st->st_ctim, 0);
    st->st_birthtim = st->st_ctim;
  }
  return 0;
}