zip_archive_private.h revision e6884ce56f07933d7292eb0ada1ff752f9c69e7a 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *    http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
18#define LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
19
20#include <stdint.h>
21#include <stdlib.h>
22#include <unistd.h>
23
24#include <utils/FileMap.h>
25#include <ziparchive/zip_archive.h>
26
27struct ZipArchive {
28  // open Zip archive
29  const int fd;
30  const bool close_file;
31
32  // mapped central directory area
33  off64_t directory_offset;
34  android::FileMap directory_map;
35
36  // number of entries in the Zip archive
37  uint16_t num_entries;
38
39  // We know how many entries are in the Zip archive, so we can have a
40  // fixed-size hash table. We define a load factor of 0.75 and over
41  // allocate so the maximum number entries can never be higher than
42  // ((4 * UINT16_MAX) / 3 + 1) which can safely fit into a uint32_t.
43  uint32_t hash_table_size;
44  ZipString* hash_table;
45
46  ZipArchive(const int fd, bool assume_ownership) :
47      fd(fd),
48      close_file(assume_ownership),
49      directory_offset(0),
50      num_entries(0),
51      hash_table_size(0),
52      hash_table(NULL) {}
53
54  ~ZipArchive() {
55    if (close_file && fd >= 0) {
56      close(fd);
57    }
58
59    free(hash_table);
60  }
61};
62
63#endif  // LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
64