2 * Copyright (C) 2006 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 // Asset management class. AssetManager objects are thread-safe.
20 #ifndef __LIBS_ASSETMANAGER_H
21 #define __LIBS_ASSETMANAGER_H
23 #include <androidfw/Asset.h>
24 #include <androidfw/AssetDir.h>
25 #include <androidfw/ZipFileRO.h>
26 #include <utils/KeyedVector.h>
27 #include <utils/SortedVector.h>
28 #include <utils/String16.h>
29 #include <utils/String8.h>
30 #include <utils/threads.h>
31 #include <utils/Vector.h>
34 * Native-app access is via the opaque typedef struct AAssetManager in the C namespace.
40 struct AAssetManager { };
48 * Now the proper C++ android-namespace definitions
53 class Asset; // fwd decl for things that include Asset.h first
55 struct ResTable_config;
58 * Every application that uses assets needs one instance of this. A
59 * single instance may be shared across multiple threads, and a single
60 * thread may have more than one instance (the latter is discouraged).
62 * The purpose of the AssetManager is to create Asset objects. To do
63 * this efficiently it may cache information about the locations of
64 * files it has seen. This can be controlled with the "cacheMode"
67 * The asset hierarchy may be examined like a filesystem, using
68 * AssetDir objects to peruse a single directory.
70 class AssetManager : public AAssetManager {
72 static const char* RESOURCES_FILENAME;
73 static const char* IDMAP_BIN;
74 static const char* OVERLAY_DIR;
75 static const char* TARGET_PACKAGE_NAME;
76 static const char* TARGET_APK_PATH;
77 static const char* IDMAP_DIR;
79 typedef enum CacheMode {
81 CACHE_OFF, // don't try to cache file locations
82 CACHE_DEFER, // construct cache as pieces are needed
83 //CACHE_SCAN, // scan full(!) asset hierarchy at init() time
86 AssetManager(CacheMode cacheMode = CACHE_OFF);
87 virtual ~AssetManager(void);
89 static int32_t getGlobalCount();
92 * Add a new source for assets. This can be called multiple times to
93 * look in multiple places for assets. It can be either a directory (for
94 * finding assets as raw files on the disk) or a ZIP file. This newly
95 * added asset path will be examined first when searching for assets,
96 * before any that were previously added.
98 * Returns "true" on success, "false" on failure. If 'cookie' is non-NULL,
99 * then on success, *cookie is set to the value corresponding to the
100 * newly-added asset source.
102 bool addAssetPath(const String8& path, int32_t* cookie);
103 bool addOverlayPath(const String8& path, int32_t* cookie);
106 * Convenience for adding the standard system assets. Uses the
107 * ANDROID_ROOT environment variable to find them.
109 bool addDefaultAssets();
112 * Iterate over the asset paths in this manager. (Previously
113 * added via addAssetPath() and addDefaultAssets().) On first call,
114 * 'cookie' must be 0, resulting in the first cookie being returned.
115 * Each next cookie will be returned there-after, until -1 indicating
116 * the end has been reached.
118 int32_t nextAssetPath(const int32_t cookie) const;
121 * Return an asset path in the manager. 'which' must be between 0 and
124 String8 getAssetPath(const int32_t cookie) const;
127 * Set the current locale and vendor. The locale can change during
128 * the lifetime of an AssetManager if the user updates the device's
129 * language setting. The vendor is less likely to change.
131 * Pass in NULL to indicate no preference.
133 void setLocale(const char* locale);
134 void setVendor(const char* vendor);
137 * Choose screen orientation for resources values returned.
139 void setConfiguration(const ResTable_config& config, const char* locale = NULL);
141 void getConfiguration(ResTable_config* outConfig) const;
143 typedef Asset::AccessMode AccessMode; // typing shortcut
148 * This will search through locale-specific and vendor-specific
149 * directories and packages to find the file.
151 * The object returned does not depend on the AssetManager. It should
152 * be freed by calling Asset::close().
154 Asset* open(const char* fileName, AccessMode mode);
157 * Open a non-asset file as an asset.
159 * This is for opening files that are included in an asset package
160 * but aren't assets. These sit outside the usual "locale/vendor"
161 * path hierarchy, and will not be seen by "AssetDir" or included
162 * in our filename cache.
164 Asset* openNonAsset(const char* fileName, AccessMode mode, int32_t* outCookie = NULL);
167 * Explicit non-asset file. The file explicitly named by the cookie (the
168 * resource set to look in) and fileName will be opened and returned.
170 Asset* openNonAsset(const int32_t cookie, const char* fileName, AccessMode mode);
173 * Open a directory within the asset hierarchy.
175 * The contents of the directory are an amalgam of vendor-specific,
176 * locale-specific, and generic assets stored loosely or in asset
177 * packages. Depending on the cache setting and previous accesses,
178 * this call may incur significant disk overhead.
180 * To open the top-level directory, pass in "".
182 AssetDir* openDir(const char* dirName);
185 * Open a directory within a particular path of the asset manager.
187 * The contents of the directory are an amalgam of vendor-specific,
188 * locale-specific, and generic assets stored loosely or in asset
189 * packages. Depending on the cache setting and previous accesses,
190 * this call may incur significant disk overhead.
192 * To open the top-level directory, pass in "".
194 AssetDir* openNonAssetDir(const int32_t cookie, const char* dirName);
197 * Get the type of a file in the asset hierarchy. They will either
198 * be "regular" or "directory". [Currently only works for "regular".]
200 * Can also be used as a quick test for existence of a file.
202 FileType getFileType(const char* fileName);
205 * Return the complete resource table to find things in the package.
207 const ResTable& getResources(bool required = true) const;
210 * Discard cached filename information. This only needs to be called
211 * if somebody has updated the set of "loose" files, and we want to
212 * discard our cached notion of what's where.
214 void purge(void) { purgeFileNameCacheLocked(); }
217 * Return true if the files this AssetManager references are all
218 * up-to-date (have not been changed since it was created). If false
219 * is returned, you will need to create a new AssetManager to get
225 * Get the known locales for this asset manager object.
227 void getLocales(Vector<String8>* locales) const;
230 * Generate idmap data to translate resources IDs between a package and a
231 * corresponding overlay package.
233 bool createIdmap(const char* targetApkPath, const char* overlayApkPath,
234 uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, size_t* outSize);
244 Asset* openInPathLocked(const char* fileName, AccessMode mode,
245 const asset_path& path);
246 Asset* openNonAssetInPathLocked(const char* fileName, AccessMode mode,
247 const asset_path& path);
248 Asset* openInLocaleVendorLocked(const char* fileName, AccessMode mode,
249 const asset_path& path, const char* locale, const char* vendor);
250 String8 createPathNameLocked(const asset_path& path, const char* locale,
252 String8 createPathNameLocked(const asset_path& path, const char* rootDir);
253 String8 createZipSourceNameLocked(const String8& zipFileName,
254 const String8& dirName, const String8& fileName);
256 ZipFileRO* getZipFileLocked(const asset_path& path);
257 Asset* openAssetFromFileLocked(const String8& fileName, AccessMode mode);
258 Asset* openAssetFromZipLocked(const ZipFileRO* pZipFile,
259 const ZipEntryRO entry, AccessMode mode, const String8& entryName);
261 bool scanAndMergeDirLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
262 const asset_path& path, const char* rootDir, const char* dirName);
263 SortedVector<AssetDir::FileInfo>* scanDirLocked(const String8& path);
264 bool scanAndMergeZipLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
265 const asset_path& path, const char* rootDir, const char* dirName);
266 void mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
267 const SortedVector<AssetDir::FileInfo>* pContents);
269 void loadFileNameCacheLocked(void);
270 void fncScanLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
271 const char* dirName);
272 bool fncScanAndMergeDirLocked(
273 SortedVector<AssetDir::FileInfo>* pMergedInfo,
274 const asset_path& path, const char* locale, const char* vendor,
275 const char* dirName);
276 void purgeFileNameCacheLocked(void);
278 const ResTable* getResTable(bool required = true) const;
279 void setLocaleLocked(const char* locale);
280 void updateResourceParamsLocked() const;
281 bool appendPathToResTable(const asset_path& ap) const;
283 Asset* openIdmapLocked(const struct asset_path& ap) const;
285 void addSystemOverlays(const char* pathOverlaysList, const String8& targetPackagePath,
286 ResTable* sharedRes, size_t offset) const;
288 class SharedZip : public RefBase {
290 static sp<SharedZip> get(const String8& path, bool createIfNotPresent = true);
294 Asset* getResourceTableAsset();
295 Asset* setResourceTableAsset(Asset* asset);
297 ResTable* getResourceTable();
298 ResTable* setResourceTable(ResTable* res);
302 void addOverlay(const asset_path& ap);
303 bool getOverlay(size_t idx, asset_path* out) const;
309 SharedZip(const String8& path, time_t modWhen);
310 SharedZip(); // <-- not implemented
316 Asset* mResourceTableAsset;
317 ResTable* mResourceTable;
319 Vector<asset_path> mOverlays;
322 static DefaultKeyedVector<String8, wp<SharedZip> > gOpen;
326 * Manage a set of Zip files. For each file we need a pointer to the
327 * ZipFile and a time_t with the file's modification date.
329 * We currently only have two zip files (current app, "common" app).
330 * (This was originally written for 8, based on app/locale/vendor.)
338 * Return a ZipFileRO structure for a ZipFileRO with the specified
341 ZipFileRO* getZip(const String8& path);
343 Asset* getZipResourceTableAsset(const String8& path);
344 Asset* setZipResourceTableAsset(const String8& path, Asset* asset);
346 ResTable* getZipResourceTable(const String8& path);
347 ResTable* setZipResourceTable(const String8& path, ResTable* res);
349 // generate path, e.g. "common/en-US-noogle.zip"
350 static String8 getPathName(const char* path);
354 void addOverlay(const String8& path, const asset_path& overlay);
355 bool getOverlay(const String8& path, size_t idx, asset_path* out) const;
358 void closeZip(int idx);
360 int getIndex(const String8& zip) const;
361 mutable Vector<String8> mZipPath;
362 mutable Vector<sp<SharedZip> > mZipFile;
365 // Protect all internal state.
370 Vector<asset_path> mAssetPaths;
374 mutable ResTable* mResources;
375 ResTable_config* mConfig;
378 * Cached data for "loose" files. This lets us avoid poking at the
379 * filesystem when searching for loose assets. Each entry is the
380 * "extended partial" path, e.g. "default/default/foo/bar.txt". The
381 * full set of files is present, including ".EXCLUDE" entries.
383 * We do not cache directory names. We don't retain the ".gz",
384 * because to our clients "foo" and "foo.gz" both look like "foo".
386 CacheMode mCacheMode; // is the cache enabled?
387 bool mCacheValid; // clear when locale or vendor changes
388 SortedVector<AssetDir::FileInfo> mCache;
391 }; // namespace android
393 #endif // __LIBS_ASSETMANAGER_H