/*-*- 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 2023 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/assert.h"
#include "libc/limits.h"
#include "libc/runtime/zipos.internal.h"
#include "libc/stdio/stdio.h"
#include "libc/zip.internal.h"

static uint64_t __zipos_fnv(const char *s, int len) {
  uint64_t hash = 0xcbf29ce484222325;
  for (int i = 0; i < len; i++) {
    hash *= 0x100000001b3;
    hash ^= (unsigned char)s[i];
  }
  return hash;
}

uint64_t __zipos_inode(struct Zipos *zipos, int64_t cfile,  //
                       const void *name, size_t namelen) {
  unassert(cfile >= 0);
  if (cfile == ZIPOS_SYNTHETIC_DIRECTORY) {
    if (namelen && ((char *)name)[namelen - 1] == '/') --namelen;
    cfile = INT64_MIN | __zipos_fnv(name, namelen);
  }
  return cfile;
}