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
173
174
175
176
177
178
179
180
181
|
/*
* Copyright (C) 2013 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.
*/
#ifndef LIBZIPARCHIVE_ZIPARCHIVE_H_
#define LIBZIPARCHIVE_ZIPARCHIVE_H_
#include <stdint.h>
#include <sys/types.h>
#include <utils/Compat.h>
__BEGIN_DECLS
/* Zip compression methods we support */
enum {
kCompressStored = 0, // no compression
kCompressDeflated = 8, // standard deflate
};
struct ZipEntryName {
const char* name;
uint16_t name_length;
};
/*
* Represents information about a zip entry in a zip file.
*/
struct ZipEntry {
// Compression method: One of kCompressStored or
// kCompressDeflated.
uint16_t method;
// Modification time. The zipfile format specifies
// that the first two little endian bytes contain the time
// and the last two little endian bytes contain the date.
uint32_t mod_time;
// 1 if this entry contains a data descriptor segment, 0
// otherwise.
uint8_t has_data_descriptor;
// Crc32 value of this ZipEntry. This information might
// either be stored in the local file header or in a special
// Data descriptor footer at the end of the file entry.
uint32_t crc32;
// Compressed length of this ZipEntry. Might be present
// either in the local file header or in the data descriptor
// footer.
uint32_t compressed_length;
// Uncompressed length of this ZipEntry. Might be present
// either in the local file header or in the data descriptor
// footer.
uint32_t uncompressed_length;
// The offset to the start of data for this ZipEntry.
off64_t offset;
};
typedef void* ZipArchiveHandle;
/*
* Open a Zip archive, and sets handle to the value of the opaque
* handle for the file. This handle must be released by calling
* CloseArchive with this handle.
*
* Returns 0 on success, and negative values on failure.
*/
int32_t OpenArchive(const char* fileName, ZipArchiveHandle* handle);
/*
* Like OpenArchive, but takes a file descriptor open for reading
* at the start of the file. The descriptor must be mappable (this does
* not allow access to a stream).
*
* Sets handle to the value of the opaque handle for this file descriptor.
* This handle must be released by calling CloseArchive with this handle.
*
* This function maps and scans the central directory and builds a table
* of entries for future lookups.
*
* "debugFileName" will appear in error messages, but is not otherwise used.
*
* Returns 0 on success, and negative values on failure.
*/
int32_t OpenArchiveFd(const int fd, const char* debugFileName,
ZipArchiveHandle *handle);
/*
* Close archive, releasing resources associated with it. This will
* unmap the central directory of the zipfile and free all internal
* data structures associated with the file. It is an error to use
* this handle for any further operations without an intervening
* call to one of the OpenArchive variants.
*/
void CloseArchive(ZipArchiveHandle handle);
/*
* Find an entry in the Zip archive, by name. |entryName| must be a null
* terminated string, and |data| must point to a writeable memory location.
*
* Returns 0 if an entry is found, and populates |data| with information
* about this entry. Returns negative values otherwise.
*
* It's important to note that |data->crc32|, |data->compLen| and
* |data->uncompLen| might be set to values from the central directory
* if this file entry contains a data descriptor footer. To verify crc32s
* and length, a call to VerifyCrcAndLengths must be made after entry data
* has been processed.
*/
int32_t FindEntry(const ZipArchiveHandle handle, const char* entryName,
ZipEntry* data);
/*
* Start iterating over all entries of a zip file. The order of iteration
* is not guaranteed to be the same as the order of elements
* in the central directory but is stable for a given zip file. |cookie|
* must point to a writeable memory location, and will be set to the value
* of an opaque cookie which can be used to make one or more calls to
* Next.
*
* This method also accepts an optional prefix to restrict iteration to
* entry names that start with |prefix|.
*
* Returns 0 on success and negative values on failure.
*/
int32_t StartIteration(ZipArchiveHandle handle, void** cookie_ptr,
const char* prefix);
/*
* Advance to the next element in the zipfile in iteration order.
*
* Returns 0 on success, -1 if there are no more elements in this
* archive and lower negative values on failure.
*/
int32_t Next(void* cookie, ZipEntry* data, ZipEntryName *name);
/*
* Uncompress and write an entry to an open file identified by |fd|.
* |entry->uncompressed_length| bytes will be written to the file at
* its current offset, and the file will be truncated at the end of
* the uncompressed data.
*
* Returns 0 on success and negative values on failure.
*/
int32_t ExtractEntryToFile(ZipArchiveHandle handle, ZipEntry* entry, int fd);
/**
* Uncompress a given zip entry to the memory region at |begin| and of
* size |size|. This size is expected to be the same as the *declared*
* uncompressed length of the zip entry. It is an error if the *actual*
* number of uncompressed bytes differs from this number.
*
* Returns 0 on success and negative values on failure.
*/
int32_t ExtractToMemory(ZipArchiveHandle handle, ZipEntry* entry,
uint8_t* begin, uint32_t size);
int GetFileDescriptor(const ZipArchiveHandle handle);
const char* ErrorCodeString(int32_t error_code);
__END_DECLS
#endif // LIBZIPARCHIVE_ZIPARCHIVE_H_
|
