1 /*
2  * Copyright (C) 2006 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 //
18 // Class to rewrite zip file headers to remove dynamic timestamps.
19 //
20 #ifndef __LIBS_ZIPFILE_H
21 #define __LIBS_ZIPFILE_H
22 
23 #include <stdio.h>
24 
25 #include "ZipEntry.h"
26 
27 namespace android {
28 
29 /*
30  * Manipulate a Zip archive.
31  */
32 class ZipFile {
33 public:
ZipFile(void)34     ZipFile(void) : mZipFp(NULL) {}
~ZipFile(void)35     ~ZipFile(void) {
36         if (mZipFp != NULL)
37             fclose(mZipFp);
38     }
39 
40     /*
41      * Rewrite an archive's headers to remove dynamic timestamps.
42      */
43     status_t rewrite(const char* zipFileName);
44 
45 private:
46     /* these are private and not defined */
47     ZipFile(const ZipFile& src);
48     ZipFile& operator=(const ZipFile& src);
49 
50     class EndOfCentralDir {
51     public:
EndOfCentralDir(void)52         EndOfCentralDir(void) : mTotalNumEntries(0), mCentralDirOffset(0) {}
53 
54         status_t readBuf(const uint8_t* buf, int len);
55 
56         uint16_t mTotalNumEntries;
57         uint32_t mCentralDirOffset;      // offset from first disk
58 
59         enum {
60             kSignature      = 0x06054b50,
61             kEOCDLen        = 22,       // EndOfCentralDir len, excl. comment
62 
63             kMaxCommentLen  = 65535,    // longest possible in ushort
64             kMaxEOCDSearch  = kMaxCommentLen + EndOfCentralDir::kEOCDLen,
65 
66         };
67     };
68 
69     /* read all entries in the central dir */
70     status_t rewriteCentralDir(void);
71 
72     /*
73      * We use stdio FILE*, which gives us buffering but makes dealing
74      * with files >2GB awkward.  Until we support Zip64, we're fine.
75      */
76     FILE*           mZipFp;             // Zip file pointer
77 
78     /* one of these per file */
79     EndOfCentralDir mEOCD;
80 };
81 
82 }; // namespace android
83 
84 #endif // __LIBS_ZIPFILE_H
85