1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Read-only access to Zip archives, with minimal heap allocation.
*
* This is similar to the more-complete ZipFile class, but no attempt
* has been made to make them interchangeable. This class operates under
* a very different set of assumptions and constraints.
*
* One such assumption is that if you're getting file descriptors for
* use with this class as a child of a fork() operation, you must be on
* a pread() to guarantee correct operation. This is because pread() can
* atomically read at a file offset without worrying about a lock around an
* lseek() + read() pair.
*/
#ifndef __LIBS_ZIPFILERO_H
#define __LIBS_ZIPFILERO_H
#include <utils/Compat.h>
#include <utils/Errors.h>
#include <utils/FileMap.h>
#include <utils/threads.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
typedef void* ZipArchiveHandle;
namespace android {
/*
* Trivial typedef to ensure that ZipEntryRO is not treated as a simple
* integer. We use NULL to indicate an invalid value.
*/
typedef void* ZipEntryRO;
/*
* Open a Zip archive for reading.
*
* Implemented as a thin wrapper over system/core/libziparchive.
*
* "open" and "find entry by name" are fast operations and use as little
* memory as possible.
*
* We also support fast iteration over all entries in the file (with a
* stable, but unspecified iteration order).
*
* NOTE: If this is used on file descriptors inherited from a fork() operation,
* you must be on a platform that implements pread() to guarantee correctness
* on the shared file descriptors.
*/
class ZipFileRO {
public:
/* Zip compression methods we support */
enum : uint16_t {
kCompressStored = 0,
kCompressDeflated = 8
};
/*
* Open an archive.
*/
static ZipFileRO* open(const char* zipFileName);
/*
* Find an entry, by name. Returns the entry identifier, or NULL if
* not found.
*/
ZipEntryRO findEntryByName(const char* entryName) const;
/*
* Start iterating over the list of entries in the zip file. Requires
* a matching call to endIteration with the same cookie.
*/
bool startIteration(void** cookie);
/**
* Return the next entry in iteration order, or NULL if there are no more
* entries in this archive.
*/
ZipEntryRO nextEntry(void* cookie);
void endIteration(void* cookie);
void releaseEntry(ZipEntryRO entry) const;
/*
* Return the #of entries in the Zip archive.
*/
int getNumEntries();
/*
* Copy the filename into the supplied buffer. Returns 0 on success,
* -1 if "entry" is invalid, or the filename length if it didn't fit. The
* length, and the returned string, include the null-termination.
*/
int getEntryFileName(ZipEntryRO entry, char* buffer, size_t bufLen) const;
/*
* Get the vital stats for an entry. Pass in NULL pointers for anything
* you don't need.
*
* "*pOffset" holds the Zip file offset of the entry's data.
*
* Returns "false" if "entry" is bogus or if the data in the Zip file
* appears to be bad.
*/
bool getEntryInfo(ZipEntryRO entry, uint16_t* pMethod, uint32_t* pUncompLen,
uint32_t* pCompLen, off64_t* pOffset, uint32_t* pModWhen,
uint32_t* pCrc32) const;
/*
* Create a new FileMap object that maps a subset of the archive. For
* an uncompressed entry this effectively provides a pointer to the
* actual data, for a compressed entry this provides the input buffer
* for inflate().
*/
FileMap* createEntryFileMap(ZipEntryRO entry) const;
/*
* Uncompress the data into a buffer. Depending on the compression
* format, this is either an "inflate" operation or a memcpy.
*
* Use "uncompLen" from getEntryInfo() to determine the required
* buffer size.
*
* Returns "true" on success.
*/
bool uncompressEntry(ZipEntryRO entry, void* buffer, size_t size) const;
/*
* Uncompress the data to an open file descriptor.
*/
bool uncompressEntry(ZipEntryRO entry, int fd) const;
~ZipFileRO();
private:
/* these are private and not defined */
ZipFileRO(const ZipFileRO& src);
ZipFileRO& operator=(const ZipFileRO& src);
ZipFileRO(ZipArchiveHandle handle, char* fileName) : mHandle(handle),
mFileName(fileName)
{
}
const ZipArchiveHandle mHandle;
char* mFileName;
};
}; // namespace android
#endif /*__LIBS_ZIPFILERO_H*/
|
