1 /*
2 * Copyright (C) 2007 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 // Read-only access to Zip archives, with minimal heap allocation.
19 //
20 #define LOG_TAG "zipro"
21 //#define LOG_NDEBUG 0
22 #include <androidfw/ZipFileRO.h>
23 #include <utils/Log.h>
24 #include <utils/Compat.h>
25 #include <utils/misc.h>
26 #include <utils/threads.h>
27 #include <ziparchive/zip_archive.h>
28
29 #include <zlib.h>
30
31 #include <string.h>
32 #include <fcntl.h>
33 #include <errno.h>
34 #include <assert.h>
35 #include <unistd.h>
36
37 using namespace android;
38
39 class _ZipEntryRO {
40 public:
41 ZipEntry entry;
42 ZipString name;
43 void *cookie;
44
_ZipEntryRO()45 _ZipEntryRO() : cookie(NULL) {}
46
~_ZipEntryRO()47 ~_ZipEntryRO() {
48 EndIteration(cookie);
49 }
50
51 private:
52 _ZipEntryRO(const _ZipEntryRO& other);
53 _ZipEntryRO& operator=(const _ZipEntryRO& other);
54 };
55
~ZipFileRO()56 ZipFileRO::~ZipFileRO() {
57 CloseArchive(mHandle);
58 if (mFileName != NULL) {
59 free(mFileName);
60 }
61 }
62
63 /*
64 * Open the specified file read-only. We memory-map the entire thing and
65 * close the file before returning.
66 */
open(const char * zipFileName)67 /* static */ ZipFileRO* ZipFileRO::open(const char* zipFileName)
68 {
69 ZipArchiveHandle handle;
70 const int32_t error = OpenArchive(zipFileName, &handle);
71 if (error) {
72 ALOGW("Error opening archive %s: %s", zipFileName, ErrorCodeString(error));
73 CloseArchive(handle);
74 return NULL;
75 }
76
77 return new ZipFileRO(handle, strdup(zipFileName));
78 }
79
80
openFd(int fd,const char * debugFileName,bool assume_ownership)81 /* static */ ZipFileRO* ZipFileRO::openFd(int fd, const char* debugFileName,
82 bool assume_ownership)
83 {
84 ZipArchiveHandle handle;
85 const int32_t error = OpenArchiveFd(fd, debugFileName, &handle, assume_ownership);
86 if (error) {
87 ALOGW("Error opening archive fd %d %s: %s", fd, debugFileName, ErrorCodeString(error));
88 CloseArchive(handle);
89 return NULL;
90 }
91
92 return new ZipFileRO(handle, strdup(debugFileName));
93 }
94
findEntryByName(const char * entryName) const95 ZipEntryRO ZipFileRO::findEntryByName(const char* entryName) const
96 {
97 _ZipEntryRO* data = new _ZipEntryRO;
98
99 data->name = ZipString(entryName);
100
101 const int32_t error = FindEntry(mHandle, data->name, &(data->entry));
102 if (error) {
103 delete data;
104 return NULL;
105 }
106
107 return (ZipEntryRO) data;
108 }
109
110 /*
111 * Get the useful fields from the zip entry.
112 *
113 * Returns "false" if the offsets to the fields or the contents of the fields
114 * appear to be bogus.
115 */
getEntryInfo(ZipEntryRO entry,uint16_t * pMethod,uint32_t * pUncompLen,uint32_t * pCompLen,off64_t * pOffset,uint32_t * pModWhen,uint32_t * pCrc32) const116 bool ZipFileRO::getEntryInfo(ZipEntryRO entry, uint16_t* pMethod,
117 uint32_t* pUncompLen, uint32_t* pCompLen, off64_t* pOffset,
118 uint32_t* pModWhen, uint32_t* pCrc32) const
119 {
120 const _ZipEntryRO* zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
121 const ZipEntry& ze = zipEntry->entry;
122
123 if (pMethod != NULL) {
124 *pMethod = ze.method;
125 }
126 if (pUncompLen != NULL) {
127 *pUncompLen = ze.uncompressed_length;
128 }
129 if (pCompLen != NULL) {
130 *pCompLen = ze.compressed_length;
131 }
132 if (pOffset != NULL) {
133 *pOffset = ze.offset;
134 }
135 if (pModWhen != NULL) {
136 *pModWhen = ze.mod_time;
137 }
138 if (pCrc32 != NULL) {
139 *pCrc32 = ze.crc32;
140 }
141
142 return true;
143 }
144
startIteration(void ** cookie)145 bool ZipFileRO::startIteration(void** cookie) {
146 return startIteration(cookie, NULL, NULL);
147 }
148
startIteration(void ** cookie,const char * prefix,const char * suffix)149 bool ZipFileRO::startIteration(void** cookie, const char* prefix, const char* suffix)
150 {
151 _ZipEntryRO* ze = new _ZipEntryRO;
152 ZipString pe(prefix ? prefix : "");
153 ZipString se(suffix ? suffix : "");
154 int32_t error = StartIteration(mHandle, &(ze->cookie),
155 prefix ? &pe : NULL,
156 suffix ? &se : NULL);
157 if (error) {
158 ALOGW("Could not start iteration over %s: %s", mFileName != NULL ? mFileName : "<null>",
159 ErrorCodeString(error));
160 delete ze;
161 return false;
162 }
163
164 *cookie = ze;
165 return true;
166 }
167
nextEntry(void * cookie)168 ZipEntryRO ZipFileRO::nextEntry(void* cookie)
169 {
170 _ZipEntryRO* ze = reinterpret_cast<_ZipEntryRO*>(cookie);
171 int32_t error = Next(ze->cookie, &(ze->entry), &(ze->name));
172 if (error) {
173 if (error != -1) {
174 ALOGW("Error iteration over %s: %s", mFileName != NULL ? mFileName : "<null>",
175 ErrorCodeString(error));
176 }
177 return NULL;
178 }
179
180 return &(ze->entry);
181 }
182
endIteration(void * cookie)183 void ZipFileRO::endIteration(void* cookie)
184 {
185 delete reinterpret_cast<_ZipEntryRO*>(cookie);
186 }
187
releaseEntry(ZipEntryRO entry) const188 void ZipFileRO::releaseEntry(ZipEntryRO entry) const
189 {
190 delete reinterpret_cast<_ZipEntryRO*>(entry);
191 }
192
193 /*
194 * Copy the entry's filename to the buffer.
195 */
getEntryFileName(ZipEntryRO entry,char * buffer,size_t bufLen) const196 int ZipFileRO::getEntryFileName(ZipEntryRO entry, char* buffer, size_t bufLen)
197 const
198 {
199 const _ZipEntryRO* zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
200 const uint16_t requiredSize = zipEntry->name.name_length + 1;
201
202 if (bufLen < requiredSize) {
203 ALOGW("Buffer too short, requires %d bytes for entry name", requiredSize);
204 return requiredSize;
205 }
206
207 memcpy(buffer, zipEntry->name.name, requiredSize - 1);
208 buffer[requiredSize - 1] = '\0';
209
210 return 0;
211 }
212
213 /*
214 * Create a new FileMap object that spans the data in "entry".
215 */
createEntryFileMap(ZipEntryRO entry) const216 FileMap* ZipFileRO::createEntryFileMap(ZipEntryRO entry) const
217 {
218 const _ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
219 const ZipEntry& ze = zipEntry->entry;
220 int fd = GetFileDescriptor(mHandle);
221 size_t actualLen = 0;
222
223 if (ze.method == kCompressStored) {
224 actualLen = ze.uncompressed_length;
225 } else {
226 actualLen = ze.compressed_length;
227 }
228
229 FileMap* newMap = new FileMap();
230 if (!newMap->create(mFileName, fd, ze.offset, actualLen, true)) {
231 delete newMap;
232 return NULL;
233 }
234
235 return newMap;
236 }
237
238 /*
239 * Uncompress an entry, in its entirety, into the provided output buffer.
240 *
241 * This doesn't verify the data's CRC, which might be useful for
242 * uncompressed data. The caller should be able to manage it.
243 */
uncompressEntry(ZipEntryRO entry,void * buffer,size_t size) const244 bool ZipFileRO::uncompressEntry(ZipEntryRO entry, void* buffer, size_t size) const
245 {
246 _ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
247 const int32_t error = ExtractToMemory(mHandle, &(zipEntry->entry),
248 (uint8_t*) buffer, size);
249 if (error) {
250 ALOGW("ExtractToMemory failed with %s", ErrorCodeString(error));
251 return false;
252 }
253
254 return true;
255 }
256
257 /*
258 * Uncompress an entry, in its entirety, to an open file descriptor.
259 *
260 * This doesn't verify the data's CRC, but probably should.
261 */
uncompressEntry(ZipEntryRO entry,int fd) const262 bool ZipFileRO::uncompressEntry(ZipEntryRO entry, int fd) const
263 {
264 _ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
265 const int32_t error = ExtractEntryToFile(mHandle, &(zipEntry->entry), fd);
266 if (error) {
267 ALOGW("ExtractToMemory failed with %s", ErrorCodeString(error));
268 return false;
269 }
270
271 return true;
272 }
273