AssetManager.cpp revision f12af5e90727869d225f169e7f475695da64bf48
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// Provide access to read-only assets. 19// 20 21#define LOG_TAG "asset" 22#define ATRACE_TAG ATRACE_TAG_RESOURCES 23//#define LOG_NDEBUG 0 24 25#include <androidfw/Asset.h> 26#include <androidfw/AssetDir.h> 27#include <androidfw/AssetManager.h> 28#include <androidfw/misc.h> 29#include <androidfw/ResourceTypes.h> 30#include <androidfw/ZipFileRO.h> 31#include <utils/Atomic.h> 32#include <utils/Log.h> 33#include <utils/String8.h> 34#include <utils/String8.h> 35#include <utils/threads.h> 36#include <utils/Timers.h> 37#include <utils/Trace.h> 38#ifndef _WIN32 39#include <sys/file.h> 40#endif 41 42#include <assert.h> 43#include <dirent.h> 44#include <errno.h> 45#include <string.h> // strerror 46#include <strings.h> 47 48#ifndef TEMP_FAILURE_RETRY 49/* Used to retry syscalls that can return EINTR. */ 50#define TEMP_FAILURE_RETRY(exp) ({ \ 51 typeof (exp) _rc; \ 52 do { \ 53 _rc = (exp); \ 54 } while (_rc == -1 && errno == EINTR); \ 55 _rc; }) 56#endif 57 58using namespace android; 59 60static const bool kIsDebug = false; 61 62/* 63 * Names for default app, locale, and vendor. We might want to change 64 * these to be an actual locale, e.g. always use en-US as the default. 65 */ 66static const char* kDefaultLocale = "default"; 67static const char* kDefaultVendor = "default"; 68static const char* kAssetsRoot = "assets"; 69static const char* kAppZipName = NULL; //"classes.jar"; 70static const char* kSystemAssets = "framework/framework-res.apk"; 71static const char* kResourceCache = "resource-cache"; 72 73static const char* kExcludeExtension = ".EXCLUDE"; 74 75static Asset* const kExcludedAsset = (Asset*) 0xd000000d; 76 77static volatile int32_t gCount = 0; 78 79const char* AssetManager::RESOURCES_FILENAME = "resources.arsc"; 80const char* AssetManager::IDMAP_BIN = "/system/bin/idmap"; 81const char* AssetManager::OVERLAY_DIR = "/vendor/overlay"; 82const char* AssetManager::TARGET_PACKAGE_NAME = "android"; 83const char* AssetManager::TARGET_APK_PATH = "/system/framework/framework-res.apk"; 84const char* AssetManager::IDMAP_DIR = "/data/resource-cache"; 85 86namespace { 87 String8 idmapPathForPackagePath(const String8& pkgPath) 88 { 89 const char* root = getenv("ANDROID_DATA"); 90 LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_DATA not set"); 91 String8 path(root); 92 path.appendPath(kResourceCache); 93 94 char buf[256]; // 256 chars should be enough for anyone... 95 strncpy(buf, pkgPath.string(), 255); 96 buf[255] = '\0'; 97 char* filename = buf; 98 while (*filename && *filename == '/') { 99 ++filename; 100 } 101 char* p = filename; 102 while (*p) { 103 if (*p == '/') { 104 *p = '@'; 105 } 106 ++p; 107 } 108 path.appendPath(filename); 109 path.append("@idmap"); 110 111 return path; 112 } 113 114 /* 115 * Like strdup(), but uses C++ "new" operator instead of malloc. 116 */ 117 static char* strdupNew(const char* str) 118 { 119 char* newStr; 120 int len; 121 122 if (str == NULL) 123 return NULL; 124 125 len = strlen(str); 126 newStr = new char[len+1]; 127 memcpy(newStr, str, len+1); 128 129 return newStr; 130 } 131} 132 133/* 134 * =========================================================================== 135 * AssetManager 136 * =========================================================================== 137 */ 138 139int32_t AssetManager::getGlobalCount() 140{ 141 return gCount; 142} 143 144AssetManager::AssetManager(CacheMode cacheMode) 145 : mLocale(NULL), mVendor(NULL), 146 mResources(NULL), mConfig(new ResTable_config), 147 mCacheMode(cacheMode), mCacheValid(false) 148{ 149 int count = android_atomic_inc(&gCount) + 1; 150 if (kIsDebug) { 151 ALOGI("Creating AssetManager %p #%d\n", this, count); 152 } 153 memset(mConfig, 0, sizeof(ResTable_config)); 154} 155 156AssetManager::~AssetManager(void) 157{ 158 int count = android_atomic_dec(&gCount); 159 if (kIsDebug) { 160 ALOGI("Destroying AssetManager in %p #%d\n", this, count); 161 } 162 163 delete mConfig; 164 delete mResources; 165 166 // don't have a String class yet, so make sure we clean up 167 delete[] mLocale; 168 delete[] mVendor; 169} 170 171bool AssetManager::addAssetPath( 172 const String8& path, int32_t* cookie, bool appAsLib, bool isSystemAsset) 173{ 174 AutoMutex _l(mLock); 175 176 asset_path ap; 177 178 String8 realPath(path); 179 if (kAppZipName) { 180 realPath.appendPath(kAppZipName); 181 } 182 ap.type = ::getFileType(realPath.string()); 183 if (ap.type == kFileTypeRegular) { 184 ap.path = realPath; 185 } else { 186 ap.path = path; 187 ap.type = ::getFileType(path.string()); 188 if (ap.type != kFileTypeDirectory && ap.type != kFileTypeRegular) { 189 ALOGW("Asset path %s is neither a directory nor file (type=%d).", 190 path.string(), (int)ap.type); 191 return false; 192 } 193 } 194 195 // Skip if we have it already. 196 for (size_t i=0; i<mAssetPaths.size(); i++) { 197 if (mAssetPaths[i].path == ap.path) { 198 if (cookie) { 199 *cookie = static_cast<int32_t>(i+1); 200 } 201 return true; 202 } 203 } 204 205 ALOGV("In %p Asset %s path: %s", this, 206 ap.type == kFileTypeDirectory ? "dir" : "zip", ap.path.string()); 207 208 ap.isSystemAsset = isSystemAsset; 209 mAssetPaths.add(ap); 210 211 // new paths are always added at the end 212 if (cookie) { 213 *cookie = static_cast<int32_t>(mAssetPaths.size()); 214 } 215 216#ifdef __ANDROID__ 217 // Load overlays, if any 218 asset_path oap; 219 for (size_t idx = 0; mZipSet.getOverlay(ap.path, idx, &oap); idx++) { 220 oap.isSystemAsset = isSystemAsset; 221 mAssetPaths.add(oap); 222 } 223#endif 224 225 if (mResources != NULL) { 226 appendPathToResTable(ap, appAsLib); 227 } 228 229 return true; 230} 231 232bool AssetManager::addOverlayPath(const String8& packagePath, int32_t* cookie) 233{ 234 const String8 idmapPath = idmapPathForPackagePath(packagePath); 235 236 AutoMutex _l(mLock); 237 238 for (size_t i = 0; i < mAssetPaths.size(); ++i) { 239 if (mAssetPaths[i].idmap == idmapPath) { 240 *cookie = static_cast<int32_t>(i + 1); 241 return true; 242 } 243 } 244 245 Asset* idmap = NULL; 246 if ((idmap = openAssetFromFileLocked(idmapPath, Asset::ACCESS_BUFFER)) == NULL) { 247 ALOGW("failed to open idmap file %s\n", idmapPath.string()); 248 return false; 249 } 250 251 String8 targetPath; 252 String8 overlayPath; 253 if (!ResTable::getIdmapInfo(idmap->getBuffer(false), idmap->getLength(), 254 NULL, NULL, NULL, &targetPath, &overlayPath)) { 255 ALOGW("failed to read idmap file %s\n", idmapPath.string()); 256 delete idmap; 257 return false; 258 } 259 delete idmap; 260 261 if (overlayPath != packagePath) { 262 ALOGW("idmap file %s inconcistent: expected path %s does not match actual path %s\n", 263 idmapPath.string(), packagePath.string(), overlayPath.string()); 264 return false; 265 } 266 if (access(targetPath.string(), R_OK) != 0) { 267 ALOGW("failed to access file %s: %s\n", targetPath.string(), strerror(errno)); 268 return false; 269 } 270 if (access(idmapPath.string(), R_OK) != 0) { 271 ALOGW("failed to access file %s: %s\n", idmapPath.string(), strerror(errno)); 272 return false; 273 } 274 if (access(overlayPath.string(), R_OK) != 0) { 275 ALOGW("failed to access file %s: %s\n", overlayPath.string(), strerror(errno)); 276 return false; 277 } 278 279 asset_path oap; 280 oap.path = overlayPath; 281 oap.type = ::getFileType(overlayPath.string()); 282 oap.idmap = idmapPath; 283#if 0 284 ALOGD("Overlay added: targetPath=%s overlayPath=%s idmapPath=%s\n", 285 targetPath.string(), overlayPath.string(), idmapPath.string()); 286#endif 287 mAssetPaths.add(oap); 288 *cookie = static_cast<int32_t>(mAssetPaths.size()); 289 290 if (mResources != NULL) { 291 appendPathToResTable(oap); 292 } 293 294 return true; 295 } 296 297bool AssetManager::createIdmap(const char* targetApkPath, const char* overlayApkPath, 298 uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, size_t* outSize) 299{ 300 AutoMutex _l(mLock); 301 const String8 paths[2] = { String8(targetApkPath), String8(overlayApkPath) }; 302 ResTable tables[2]; 303 304 for (int i = 0; i < 2; ++i) { 305 asset_path ap; 306 ap.type = kFileTypeRegular; 307 ap.path = paths[i]; 308 Asset* ass = openNonAssetInPathLocked("resources.arsc", Asset::ACCESS_BUFFER, ap); 309 if (ass == NULL) { 310 ALOGW("failed to find resources.arsc in %s\n", ap.path.string()); 311 return false; 312 } 313 tables[i].add(ass); 314 } 315 316 return tables[0].createIdmap(tables[1], targetCrc, overlayCrc, 317 targetApkPath, overlayApkPath, (void**)outData, outSize) == NO_ERROR; 318} 319 320bool AssetManager::addDefaultAssets() 321{ 322 const char* root = getenv("ANDROID_ROOT"); 323 LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_ROOT not set"); 324 325 String8 path(root); 326 path.appendPath(kSystemAssets); 327 328 return addAssetPath(path, NULL, false /* appAsLib */, true /* isSystemAsset */); 329} 330 331int32_t AssetManager::nextAssetPath(const int32_t cookie) const 332{ 333 AutoMutex _l(mLock); 334 const size_t next = static_cast<size_t>(cookie) + 1; 335 return next > mAssetPaths.size() ? -1 : next; 336} 337 338String8 AssetManager::getAssetPath(const int32_t cookie) const 339{ 340 AutoMutex _l(mLock); 341 const size_t which = static_cast<size_t>(cookie) - 1; 342 if (which < mAssetPaths.size()) { 343 return mAssetPaths[which].path; 344 } 345 return String8(); 346} 347 348/* 349 * Set the current locale. Use NULL to indicate no locale. 350 * 351 * Close and reopen Zip archives as appropriate, and reset cached 352 * information in the locale-specific sections of the tree. 353 */ 354void AssetManager::setLocale(const char* locale) 355{ 356 AutoMutex _l(mLock); 357 setLocaleLocked(locale); 358} 359 360 361static const char kFilPrefix[] = "fil"; 362static const char kTlPrefix[] = "tl"; 363 364// The sizes of the prefixes, excluding the 0 suffix. 365// char. 366static const int kFilPrefixLen = sizeof(kFilPrefix) - 1; 367static const int kTlPrefixLen = sizeof(kTlPrefix) - 1; 368 369void AssetManager::setLocaleLocked(const char* locale) 370{ 371 if (mLocale != NULL) { 372 /* previously set, purge cached data */ 373 purgeFileNameCacheLocked(); 374 //mZipSet.purgeLocale(); 375 delete[] mLocale; 376 } 377 378 // If we're attempting to set a locale that starts with "fil", 379 // we should convert it to "tl" for backwards compatibility since 380 // we've been using "tl" instead of "fil" prior to L. 381 // 382 // If the resource table already has entries for "fil", we use that 383 // instead of attempting a fallback. 384 if (strncmp(locale, kFilPrefix, kFilPrefixLen) == 0) { 385 Vector<String8> locales; 386 ResTable* res = mResources; 387 if (res != NULL) { 388 res->getLocales(&locales); 389 } 390 const size_t localesSize = locales.size(); 391 bool hasFil = false; 392 for (size_t i = 0; i < localesSize; ++i) { 393 if (locales[i].find(kFilPrefix) == 0) { 394 hasFil = true; 395 break; 396 } 397 } 398 399 400 if (!hasFil) { 401 const size_t newLocaleLen = strlen(locale); 402 // This isn't a bug. We really do want mLocale to be 1 byte 403 // shorter than locale, because we're replacing "fil-" with 404 // "tl-". 405 mLocale = new char[newLocaleLen]; 406 // Copy over "tl". 407 memcpy(mLocale, kTlPrefix, kTlPrefixLen); 408 // Copy the rest of |locale|, including the terminating '\0'. 409 memcpy(mLocale + kTlPrefixLen, locale + kFilPrefixLen, 410 newLocaleLen - kFilPrefixLen + 1); 411 updateResourceParamsLocked(); 412 return; 413 } 414 } 415 416 mLocale = strdupNew(locale); 417 updateResourceParamsLocked(); 418} 419 420/* 421 * Set the current vendor. Use NULL to indicate no vendor. 422 * 423 * Close and reopen Zip archives as appropriate, and reset cached 424 * information in the vendor-specific sections of the tree. 425 */ 426void AssetManager::setVendor(const char* vendor) 427{ 428 AutoMutex _l(mLock); 429 430 if (mVendor != NULL) { 431 /* previously set, purge cached data */ 432 purgeFileNameCacheLocked(); 433 //mZipSet.purgeVendor(); 434 delete[] mVendor; 435 } 436 mVendor = strdupNew(vendor); 437} 438 439void AssetManager::setConfiguration(const ResTable_config& config, const char* locale) 440{ 441 AutoMutex _l(mLock); 442 *mConfig = config; 443 if (locale) { 444 setLocaleLocked(locale); 445 } else if (config.language[0] != 0) { 446 char spec[RESTABLE_MAX_LOCALE_LEN]; 447 config.getBcp47Locale(spec); 448 setLocaleLocked(spec); 449 } else { 450 updateResourceParamsLocked(); 451 } 452} 453 454void AssetManager::getConfiguration(ResTable_config* outConfig) const 455{ 456 AutoMutex _l(mLock); 457 *outConfig = *mConfig; 458} 459 460/* 461 * Open an asset. 462 * 463 * The data could be; 464 * - In a file on disk (assetBase + fileName). 465 * - In a compressed file on disk (assetBase + fileName.gz). 466 * - In a Zip archive, uncompressed or compressed. 467 * 468 * It can be in a number of different directories and Zip archives. 469 * The search order is: 470 * - [appname] 471 * - locale + vendor 472 * - "default" + vendor 473 * - locale + "default" 474 * - "default + "default" 475 * - "common" 476 * - (same as above) 477 * 478 * To find a particular file, we have to try up to eight paths with 479 * all three forms of data. 480 * 481 * We should probably reject requests for "illegal" filenames, e.g. those 482 * with illegal characters or "../" backward relative paths. 483 */ 484Asset* AssetManager::open(const char* fileName, AccessMode mode) 485{ 486 AutoMutex _l(mLock); 487 488 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 489 490 491 if (mCacheMode != CACHE_OFF && !mCacheValid) 492 loadFileNameCacheLocked(); 493 494 String8 assetName(kAssetsRoot); 495 assetName.appendPath(fileName); 496 497 /* 498 * For each top-level asset path, search for the asset. 499 */ 500 501 size_t i = mAssetPaths.size(); 502 while (i > 0) { 503 i--; 504 ALOGV("Looking for asset '%s' in '%s'\n", 505 assetName.string(), mAssetPaths.itemAt(i).path.string()); 506 Asset* pAsset = openNonAssetInPathLocked(assetName.string(), mode, mAssetPaths.itemAt(i)); 507 if (pAsset != NULL) { 508 return pAsset != kExcludedAsset ? pAsset : NULL; 509 } 510 } 511 512 return NULL; 513} 514 515/* 516 * Open a non-asset file as if it were an asset. 517 * 518 * The "fileName" is the partial path starting from the application 519 * name. 520 */ 521Asset* AssetManager::openNonAsset(const char* fileName, AccessMode mode, int32_t* outCookie) 522{ 523 AutoMutex _l(mLock); 524 525 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 526 527 528 if (mCacheMode != CACHE_OFF && !mCacheValid) 529 loadFileNameCacheLocked(); 530 531 /* 532 * For each top-level asset path, search for the asset. 533 */ 534 535 size_t i = mAssetPaths.size(); 536 while (i > 0) { 537 i--; 538 ALOGV("Looking for non-asset '%s' in '%s'\n", fileName, mAssetPaths.itemAt(i).path.string()); 539 Asset* pAsset = openNonAssetInPathLocked( 540 fileName, mode, mAssetPaths.itemAt(i)); 541 if (pAsset != NULL) { 542 if (outCookie != NULL) *outCookie = static_cast<int32_t>(i + 1); 543 return pAsset != kExcludedAsset ? pAsset : NULL; 544 } 545 } 546 547 return NULL; 548} 549 550Asset* AssetManager::openNonAsset(const int32_t cookie, const char* fileName, AccessMode mode) 551{ 552 const size_t which = static_cast<size_t>(cookie) - 1; 553 554 AutoMutex _l(mLock); 555 556 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 557 558 if (mCacheMode != CACHE_OFF && !mCacheValid) 559 loadFileNameCacheLocked(); 560 561 if (which < mAssetPaths.size()) { 562 ALOGV("Looking for non-asset '%s' in '%s'\n", fileName, 563 mAssetPaths.itemAt(which).path.string()); 564 Asset* pAsset = openNonAssetInPathLocked( 565 fileName, mode, mAssetPaths.itemAt(which)); 566 if (pAsset != NULL) { 567 return pAsset != kExcludedAsset ? pAsset : NULL; 568 } 569 } 570 571 return NULL; 572} 573 574/* 575 * Get the type of a file in the asset namespace. 576 * 577 * This currently only works for regular files. All others (including 578 * directories) will return kFileTypeNonexistent. 579 */ 580FileType AssetManager::getFileType(const char* fileName) 581{ 582 Asset* pAsset = NULL; 583 584 /* 585 * Open the asset. This is less efficient than simply finding the 586 * file, but it's not too bad (we don't uncompress or mmap data until 587 * the first read() call). 588 */ 589 pAsset = open(fileName, Asset::ACCESS_STREAMING); 590 delete pAsset; 591 592 if (pAsset == NULL) 593 return kFileTypeNonexistent; 594 else 595 return kFileTypeRegular; 596} 597 598bool AssetManager::appendPathToResTable(const asset_path& ap, bool appAsLib) const { 599 // skip those ap's that correspond to system overlays 600 if (ap.isSystemOverlay) { 601 return true; 602 } 603 604 Asset* ass = NULL; 605 ResTable* sharedRes = NULL; 606 bool shared = true; 607 bool onlyEmptyResources = true; 608 ATRACE_NAME(ap.path.string()); 609 Asset* idmap = openIdmapLocked(ap); 610 size_t nextEntryIdx = mResources->getTableCount(); 611 ALOGV("Looking for resource asset in '%s'\n", ap.path.string()); 612 if (ap.type != kFileTypeDirectory) { 613 if (nextEntryIdx == 0) { 614 // The first item is typically the framework resources, 615 // which we want to avoid parsing every time. 616 sharedRes = const_cast<AssetManager*>(this)-> 617 mZipSet.getZipResourceTable(ap.path); 618 if (sharedRes != NULL) { 619 // skip ahead the number of system overlay packages preloaded 620 nextEntryIdx = sharedRes->getTableCount(); 621 } 622 } 623 if (sharedRes == NULL) { 624 ass = const_cast<AssetManager*>(this)-> 625 mZipSet.getZipResourceTableAsset(ap.path); 626 if (ass == NULL) { 627 ALOGV("loading resource table %s\n", ap.path.string()); 628 ass = const_cast<AssetManager*>(this)-> 629 openNonAssetInPathLocked("resources.arsc", 630 Asset::ACCESS_BUFFER, 631 ap); 632 if (ass != NULL && ass != kExcludedAsset) { 633 ass = const_cast<AssetManager*>(this)-> 634 mZipSet.setZipResourceTableAsset(ap.path, ass); 635 } 636 } 637 638 if (nextEntryIdx == 0 && ass != NULL) { 639 // If this is the first resource table in the asset 640 // manager, then we are going to cache it so that we 641 // can quickly copy it out for others. 642 ALOGV("Creating shared resources for %s", ap.path.string()); 643 sharedRes = new ResTable(); 644 sharedRes->add(ass, idmap, nextEntryIdx + 1, false); 645#ifdef __ANDROID__ 646 const char* data = getenv("ANDROID_DATA"); 647 LOG_ALWAYS_FATAL_IF(data == NULL, "ANDROID_DATA not set"); 648 String8 overlaysListPath(data); 649 overlaysListPath.appendPath(kResourceCache); 650 overlaysListPath.appendPath("overlays.list"); 651 addSystemOverlays(overlaysListPath.string(), ap.path, sharedRes, nextEntryIdx); 652#endif 653 sharedRes = const_cast<AssetManager*>(this)-> 654 mZipSet.setZipResourceTable(ap.path, sharedRes); 655 } 656 } 657 } else { 658 ALOGV("loading resource table %s\n", ap.path.string()); 659 ass = const_cast<AssetManager*>(this)-> 660 openNonAssetInPathLocked("resources.arsc", 661 Asset::ACCESS_BUFFER, 662 ap); 663 shared = false; 664 } 665 666 if ((ass != NULL || sharedRes != NULL) && ass != kExcludedAsset) { 667 ALOGV("Installing resource asset %p in to table %p\n", ass, mResources); 668 if (sharedRes != NULL) { 669 ALOGV("Copying existing resources for %s", ap.path.string()); 670 mResources->add(sharedRes, ap.isSystemAsset); 671 } else { 672 ALOGV("Parsing resources for %s", ap.path.string()); 673 mResources->add(ass, idmap, nextEntryIdx + 1, !shared, appAsLib, ap.isSystemAsset); 674 } 675 onlyEmptyResources = false; 676 677 if (!shared) { 678 delete ass; 679 } 680 } else { 681 ALOGV("Installing empty resources in to table %p\n", mResources); 682 mResources->addEmpty(nextEntryIdx + 1); 683 } 684 685 if (idmap != NULL) { 686 delete idmap; 687 } 688 return onlyEmptyResources; 689} 690 691const ResTable* AssetManager::getResTable(bool required) const 692{ 693 ResTable* rt = mResources; 694 if (rt) { 695 return rt; 696 } 697 698 // Iterate through all asset packages, collecting resources from each. 699 700 AutoMutex _l(mLock); 701 702 if (mResources != NULL) { 703 return mResources; 704 } 705 706 if (required) { 707 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 708 } 709 710 if (mCacheMode != CACHE_OFF && !mCacheValid) { 711 const_cast<AssetManager*>(this)->loadFileNameCacheLocked(); 712 } 713 714 mResources = new ResTable(); 715 updateResourceParamsLocked(); 716 717 bool onlyEmptyResources = true; 718 const size_t N = mAssetPaths.size(); 719 for (size_t i=0; i<N; i++) { 720 bool empty = appendPathToResTable(mAssetPaths.itemAt(i)); 721 onlyEmptyResources = onlyEmptyResources && empty; 722 } 723 724 if (required && onlyEmptyResources) { 725 ALOGW("Unable to find resources file resources.arsc"); 726 delete mResources; 727 mResources = NULL; 728 } 729 730 return mResources; 731} 732 733void AssetManager::updateResourceParamsLocked() const 734{ 735 ATRACE_CALL(); 736 ResTable* res = mResources; 737 if (!res) { 738 return; 739 } 740 741 if (mLocale) { 742 mConfig->setBcp47Locale(mLocale); 743 } else { 744 mConfig->clearLocale(); 745 } 746 747 res->setParameters(mConfig); 748} 749 750Asset* AssetManager::openIdmapLocked(const struct asset_path& ap) const 751{ 752 Asset* ass = NULL; 753 if (ap.idmap.size() != 0) { 754 ass = const_cast<AssetManager*>(this)-> 755 openAssetFromFileLocked(ap.idmap, Asset::ACCESS_BUFFER); 756 if (ass) { 757 ALOGV("loading idmap %s\n", ap.idmap.string()); 758 } else { 759 ALOGW("failed to load idmap %s\n", ap.idmap.string()); 760 } 761 } 762 return ass; 763} 764 765void AssetManager::addSystemOverlays(const char* pathOverlaysList, 766 const String8& targetPackagePath, ResTable* sharedRes, size_t offset) const 767{ 768 FILE* fin = fopen(pathOverlaysList, "r"); 769 if (fin == NULL) { 770 return; 771 } 772 773#ifndef _WIN32 774 if (TEMP_FAILURE_RETRY(flock(fileno(fin), LOCK_SH)) != 0) { 775 fclose(fin); 776 return; 777 } 778#endif 779 char buf[1024]; 780 while (fgets(buf, sizeof(buf), fin)) { 781 // format of each line: 782 // <path to apk><space><path to idmap><newline> 783 char* space = strchr(buf, ' '); 784 char* newline = strchr(buf, '\n'); 785 asset_path oap; 786 787 if (space == NULL || newline == NULL || newline < space) { 788 continue; 789 } 790 791 oap.path = String8(buf, space - buf); 792 oap.type = kFileTypeRegular; 793 oap.idmap = String8(space + 1, newline - space - 1); 794 oap.isSystemOverlay = true; 795 796 Asset* oass = const_cast<AssetManager*>(this)-> 797 openNonAssetInPathLocked("resources.arsc", 798 Asset::ACCESS_BUFFER, 799 oap); 800 801 if (oass != NULL) { 802 Asset* oidmap = openIdmapLocked(oap); 803 offset++; 804 sharedRes->add(oass, oidmap, offset + 1, false); 805 const_cast<AssetManager*>(this)->mAssetPaths.add(oap); 806 const_cast<AssetManager*>(this)->mZipSet.addOverlay(targetPackagePath, oap); 807 } 808 } 809 810#ifndef _WIN32 811 TEMP_FAILURE_RETRY(flock(fileno(fin), LOCK_UN)); 812#endif 813 fclose(fin); 814} 815 816const ResTable& AssetManager::getResources(bool required) const 817{ 818 const ResTable* rt = getResTable(required); 819 return *rt; 820} 821 822bool AssetManager::isUpToDate() 823{ 824 AutoMutex _l(mLock); 825 return mZipSet.isUpToDate(); 826} 827 828void AssetManager::getLocales(Vector<String8>* locales, bool includeSystemLocales) const 829{ 830 ResTable* res = mResources; 831 if (res != NULL) { 832 res->getLocales(locales, includeSystemLocales); 833 } 834 835 const size_t numLocales = locales->size(); 836 for (size_t i = 0; i < numLocales; ++i) { 837 const String8& localeStr = locales->itemAt(i); 838 if (localeStr.find(kTlPrefix) == 0) { 839 String8 replaced("fil"); 840 replaced += (localeStr.string() + kTlPrefixLen); 841 locales->editItemAt(i) = replaced; 842 } 843 } 844} 845 846/* 847 * Open a non-asset file as if it were an asset, searching for it in the 848 * specified app. 849 * 850 * Pass in a NULL values for "appName" if the common app directory should 851 * be used. 852 */ 853Asset* AssetManager::openNonAssetInPathLocked(const char* fileName, AccessMode mode, 854 const asset_path& ap) 855{ 856 Asset* pAsset = NULL; 857 858 /* look at the filesystem on disk */ 859 if (ap.type == kFileTypeDirectory) { 860 String8 path(ap.path); 861 path.appendPath(fileName); 862 863 pAsset = openAssetFromFileLocked(path, mode); 864 865 if (pAsset == NULL) { 866 /* try again, this time with ".gz" */ 867 path.append(".gz"); 868 pAsset = openAssetFromFileLocked(path, mode); 869 } 870 871 if (pAsset != NULL) { 872 //printf("FOUND NA '%s' on disk\n", fileName); 873 pAsset->setAssetSource(path); 874 } 875 876 /* look inside the zip file */ 877 } else { 878 String8 path(fileName); 879 880 /* check the appropriate Zip file */ 881 ZipFileRO* pZip = getZipFileLocked(ap); 882 if (pZip != NULL) { 883 //printf("GOT zip, checking NA '%s'\n", (const char*) path); 884 ZipEntryRO entry = pZip->findEntryByName(path.string()); 885 if (entry != NULL) { 886 //printf("FOUND NA in Zip file for %s\n", appName ? appName : kAppCommon); 887 pAsset = openAssetFromZipLocked(pZip, entry, mode, path); 888 pZip->releaseEntry(entry); 889 } 890 } 891 892 if (pAsset != NULL) { 893 /* create a "source" name, for debug/display */ 894 pAsset->setAssetSource( 895 createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()), String8(""), 896 String8(fileName))); 897 } 898 } 899 900 return pAsset; 901} 902 903/* 904 * Open an asset, searching for it in the directory hierarchy for the 905 * specified app. 906 * 907 * Pass in a NULL values for "appName" if the common app directory should 908 * be used. 909 */ 910Asset* AssetManager::openInPathLocked(const char* fileName, AccessMode mode, 911 const asset_path& ap) 912{ 913 Asset* pAsset = NULL; 914 915 /* 916 * Try various combinations of locale and vendor. 917 */ 918 if (mLocale != NULL && mVendor != NULL) 919 pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, mVendor); 920 if (pAsset == NULL && mVendor != NULL) 921 pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, mVendor); 922 if (pAsset == NULL && mLocale != NULL) 923 pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, NULL); 924 if (pAsset == NULL) 925 pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, NULL); 926 927 return pAsset; 928} 929 930/* 931 * Open an asset, searching for it in the directory hierarchy for the 932 * specified locale and vendor. 933 * 934 * We also search in "app.jar". 935 * 936 * Pass in NULL values for "appName", "locale", and "vendor" if the 937 * defaults should be used. 938 */ 939Asset* AssetManager::openInLocaleVendorLocked(const char* fileName, AccessMode mode, 940 const asset_path& ap, const char* locale, const char* vendor) 941{ 942 Asset* pAsset = NULL; 943 944 if (ap.type == kFileTypeDirectory) { 945 if (mCacheMode == CACHE_OFF) { 946 /* look at the filesystem on disk */ 947 String8 path(createPathNameLocked(ap, locale, vendor)); 948 path.appendPath(fileName); 949 950 String8 excludeName(path); 951 excludeName.append(kExcludeExtension); 952 if (::getFileType(excludeName.string()) != kFileTypeNonexistent) { 953 /* say no more */ 954 //printf("+++ excluding '%s'\n", (const char*) excludeName); 955 return kExcludedAsset; 956 } 957 958 pAsset = openAssetFromFileLocked(path, mode); 959 960 if (pAsset == NULL) { 961 /* try again, this time with ".gz" */ 962 path.append(".gz"); 963 pAsset = openAssetFromFileLocked(path, mode); 964 } 965 966 if (pAsset != NULL) 967 pAsset->setAssetSource(path); 968 } else { 969 /* find in cache */ 970 String8 path(createPathNameLocked(ap, locale, vendor)); 971 path.appendPath(fileName); 972 973 AssetDir::FileInfo tmpInfo; 974 bool found = false; 975 976 String8 excludeName(path); 977 excludeName.append(kExcludeExtension); 978 979 if (mCache.indexOf(excludeName) != NAME_NOT_FOUND) { 980 /* go no farther */ 981 //printf("+++ Excluding '%s'\n", (const char*) excludeName); 982 return kExcludedAsset; 983 } 984 985 /* 986 * File compression extensions (".gz") don't get stored in the 987 * name cache, so we have to try both here. 988 */ 989 if (mCache.indexOf(path) != NAME_NOT_FOUND) { 990 found = true; 991 pAsset = openAssetFromFileLocked(path, mode); 992 if (pAsset == NULL) { 993 /* try again, this time with ".gz" */ 994 path.append(".gz"); 995 pAsset = openAssetFromFileLocked(path, mode); 996 } 997 } 998 999 if (pAsset != NULL) 1000 pAsset->setAssetSource(path); 1001 1002 /* 1003 * Don't continue the search into the Zip files. Our cached info 1004 * said it was a file on disk; to be consistent with openDir() 1005 * we want to return the loose asset. If the cached file gets 1006 * removed, we fail. 1007 * 1008 * The alternative is to update our cache when files get deleted, 1009 * or make some sort of "best effort" promise, but for now I'm 1010 * taking the hard line. 1011 */ 1012 if (found) { 1013 if (pAsset == NULL) 1014 ALOGD("Expected file not found: '%s'\n", path.string()); 1015 return pAsset; 1016 } 1017 } 1018 } 1019 1020 /* 1021 * Either it wasn't found on disk or on the cached view of the disk. 1022 * Dig through the currently-opened set of Zip files. If caching 1023 * is disabled, the Zip file may get reopened. 1024 */ 1025 if (pAsset == NULL && ap.type == kFileTypeRegular) { 1026 String8 path; 1027 1028 path.appendPath((locale != NULL) ? locale : kDefaultLocale); 1029 path.appendPath((vendor != NULL) ? vendor : kDefaultVendor); 1030 path.appendPath(fileName); 1031 1032 /* check the appropriate Zip file */ 1033 ZipFileRO* pZip = getZipFileLocked(ap); 1034 if (pZip != NULL) { 1035 //printf("GOT zip, checking '%s'\n", (const char*) path); 1036 ZipEntryRO entry = pZip->findEntryByName(path.string()); 1037 if (entry != NULL) { 1038 //printf("FOUND in Zip file for %s/%s-%s\n", 1039 // appName, locale, vendor); 1040 pAsset = openAssetFromZipLocked(pZip, entry, mode, path); 1041 pZip->releaseEntry(entry); 1042 } 1043 } 1044 1045 if (pAsset != NULL) { 1046 /* create a "source" name, for debug/display */ 1047 pAsset->setAssetSource(createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()), 1048 String8(""), String8(fileName))); 1049 } 1050 } 1051 1052 return pAsset; 1053} 1054 1055/* 1056 * Create a "source name" for a file from a Zip archive. 1057 */ 1058String8 AssetManager::createZipSourceNameLocked(const String8& zipFileName, 1059 const String8& dirName, const String8& fileName) 1060{ 1061 String8 sourceName("zip:"); 1062 sourceName.append(zipFileName); 1063 sourceName.append(":"); 1064 if (dirName.length() > 0) { 1065 sourceName.appendPath(dirName); 1066 } 1067 sourceName.appendPath(fileName); 1068 return sourceName; 1069} 1070 1071/* 1072 * Create a path to a loose asset (asset-base/app/locale/vendor). 1073 */ 1074String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* locale, 1075 const char* vendor) 1076{ 1077 String8 path(ap.path); 1078 path.appendPath((locale != NULL) ? locale : kDefaultLocale); 1079 path.appendPath((vendor != NULL) ? vendor : kDefaultVendor); 1080 return path; 1081} 1082 1083/* 1084 * Create a path to a loose asset (asset-base/app/rootDir). 1085 */ 1086String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* rootDir) 1087{ 1088 String8 path(ap.path); 1089 if (rootDir != NULL) path.appendPath(rootDir); 1090 return path; 1091} 1092 1093/* 1094 * Return a pointer to one of our open Zip archives. Returns NULL if no 1095 * matching Zip file exists. 1096 * 1097 * Right now we have 2 possible Zip files (1 each in app/"common"). 1098 * 1099 * If caching is set to CACHE_OFF, to get the expected behavior we 1100 * need to reopen the Zip file on every request. That would be silly 1101 * and expensive, so instead we just check the file modification date. 1102 * 1103 * Pass in NULL values for "appName", "locale", and "vendor" if the 1104 * generics should be used. 1105 */ 1106ZipFileRO* AssetManager::getZipFileLocked(const asset_path& ap) 1107{ 1108 ALOGV("getZipFileLocked() in %p\n", this); 1109 1110 return mZipSet.getZip(ap.path); 1111} 1112 1113/* 1114 * Try to open an asset from a file on disk. 1115 * 1116 * If the file is compressed with gzip, we seek to the start of the 1117 * deflated data and pass that in (just like we would for a Zip archive). 1118 * 1119 * For uncompressed data, we may already have an mmap()ed version sitting 1120 * around. If so, we want to hand that to the Asset instead. 1121 * 1122 * This returns NULL if the file doesn't exist, couldn't be opened, or 1123 * claims to be a ".gz" but isn't. 1124 */ 1125Asset* AssetManager::openAssetFromFileLocked(const String8& pathName, 1126 AccessMode mode) 1127{ 1128 Asset* pAsset = NULL; 1129 1130 if (strcasecmp(pathName.getPathExtension().string(), ".gz") == 0) { 1131 //printf("TRYING '%s'\n", (const char*) pathName); 1132 pAsset = Asset::createFromCompressedFile(pathName.string(), mode); 1133 } else { 1134 //printf("TRYING '%s'\n", (const char*) pathName); 1135 pAsset = Asset::createFromFile(pathName.string(), mode); 1136 } 1137 1138 return pAsset; 1139} 1140 1141/* 1142 * Given an entry in a Zip archive, create a new Asset object. 1143 * 1144 * If the entry is uncompressed, we may want to create or share a 1145 * slice of shared memory. 1146 */ 1147Asset* AssetManager::openAssetFromZipLocked(const ZipFileRO* pZipFile, 1148 const ZipEntryRO entry, AccessMode mode, const String8& entryName) 1149{ 1150 Asset* pAsset = NULL; 1151 1152 // TODO: look for previously-created shared memory slice? 1153 uint16_t method; 1154 uint32_t uncompressedLen; 1155 1156 //printf("USING Zip '%s'\n", pEntry->getFileName()); 1157 1158 if (!pZipFile->getEntryInfo(entry, &method, &uncompressedLen, NULL, NULL, 1159 NULL, NULL)) 1160 { 1161 ALOGW("getEntryInfo failed\n"); 1162 return NULL; 1163 } 1164 1165 FileMap* dataMap = pZipFile->createEntryFileMap(entry); 1166 if (dataMap == NULL) { 1167 ALOGW("create map from entry failed\n"); 1168 return NULL; 1169 } 1170 1171 if (method == ZipFileRO::kCompressStored) { 1172 pAsset = Asset::createFromUncompressedMap(dataMap, mode); 1173 ALOGV("Opened uncompressed entry %s in zip %s mode %d: %p", entryName.string(), 1174 dataMap->getFileName(), mode, pAsset); 1175 } else { 1176 pAsset = Asset::createFromCompressedMap(dataMap, 1177 static_cast<size_t>(uncompressedLen), mode); 1178 ALOGV("Opened compressed entry %s in zip %s mode %d: %p", entryName.string(), 1179 dataMap->getFileName(), mode, pAsset); 1180 } 1181 if (pAsset == NULL) { 1182 /* unexpected */ 1183 ALOGW("create from segment failed\n"); 1184 } 1185 1186 return pAsset; 1187} 1188 1189 1190 1191/* 1192 * Open a directory in the asset namespace. 1193 * 1194 * An "asset directory" is simply the combination of all files in all 1195 * locations, with ".gz" stripped for loose files. With app, locale, and 1196 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1197 * 1198 * Pass in "" for the root dir. 1199 */ 1200AssetDir* AssetManager::openDir(const char* dirName) 1201{ 1202 AutoMutex _l(mLock); 1203 1204 AssetDir* pDir = NULL; 1205 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1206 1207 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1208 assert(dirName != NULL); 1209 1210 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1211 1212 if (mCacheMode != CACHE_OFF && !mCacheValid) 1213 loadFileNameCacheLocked(); 1214 1215 pDir = new AssetDir; 1216 1217 /* 1218 * Scan the various directories, merging what we find into a single 1219 * vector. We want to scan them in reverse priority order so that 1220 * the ".EXCLUDE" processing works correctly. Also, if we decide we 1221 * want to remember where the file is coming from, we'll get the right 1222 * version. 1223 * 1224 * We start with Zip archives, then do loose files. 1225 */ 1226 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1227 1228 size_t i = mAssetPaths.size(); 1229 while (i > 0) { 1230 i--; 1231 const asset_path& ap = mAssetPaths.itemAt(i); 1232 if (ap.type == kFileTypeRegular) { 1233 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1234 scanAndMergeZipLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1235 } else { 1236 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1237 scanAndMergeDirLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1238 } 1239 } 1240 1241#if 0 1242 printf("FILE LIST:\n"); 1243 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1244 printf(" %d: (%d) '%s'\n", i, 1245 pMergedInfo->itemAt(i).getFileType(), 1246 (const char*) pMergedInfo->itemAt(i).getFileName()); 1247 } 1248#endif 1249 1250 pDir->setFileList(pMergedInfo); 1251 return pDir; 1252} 1253 1254/* 1255 * Open a directory in the non-asset namespace. 1256 * 1257 * An "asset directory" is simply the combination of all files in all 1258 * locations, with ".gz" stripped for loose files. With app, locale, and 1259 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1260 * 1261 * Pass in "" for the root dir. 1262 */ 1263AssetDir* AssetManager::openNonAssetDir(const int32_t cookie, const char* dirName) 1264{ 1265 AutoMutex _l(mLock); 1266 1267 AssetDir* pDir = NULL; 1268 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1269 1270 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1271 assert(dirName != NULL); 1272 1273 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1274 1275 if (mCacheMode != CACHE_OFF && !mCacheValid) 1276 loadFileNameCacheLocked(); 1277 1278 pDir = new AssetDir; 1279 1280 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1281 1282 const size_t which = static_cast<size_t>(cookie) - 1; 1283 1284 if (which < mAssetPaths.size()) { 1285 const asset_path& ap = mAssetPaths.itemAt(which); 1286 if (ap.type == kFileTypeRegular) { 1287 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1288 scanAndMergeZipLocked(pMergedInfo, ap, NULL, dirName); 1289 } else { 1290 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1291 scanAndMergeDirLocked(pMergedInfo, ap, NULL, dirName); 1292 } 1293 } 1294 1295#if 0 1296 printf("FILE LIST:\n"); 1297 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1298 printf(" %d: (%d) '%s'\n", i, 1299 pMergedInfo->itemAt(i).getFileType(), 1300 (const char*) pMergedInfo->itemAt(i).getFileName()); 1301 } 1302#endif 1303 1304 pDir->setFileList(pMergedInfo); 1305 return pDir; 1306} 1307 1308/* 1309 * Scan the contents of the specified directory and merge them into the 1310 * "pMergedInfo" vector, removing previous entries if we find "exclude" 1311 * directives. 1312 * 1313 * Returns "false" if we found nothing to contribute. 1314 */ 1315bool AssetManager::scanAndMergeDirLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1316 const asset_path& ap, const char* rootDir, const char* dirName) 1317{ 1318 SortedVector<AssetDir::FileInfo>* pContents; 1319 String8 path; 1320 1321 assert(pMergedInfo != NULL); 1322 1323 //printf("scanAndMergeDir: %s %s %s %s\n", appName, locale, vendor,dirName); 1324 1325 if (mCacheValid) { 1326 int i, start, count; 1327 1328 pContents = new SortedVector<AssetDir::FileInfo>; 1329 1330 /* 1331 * Get the basic partial path and find it in the cache. That's 1332 * the start point for the search. 1333 */ 1334 path = createPathNameLocked(ap, rootDir); 1335 if (dirName[0] != '\0') 1336 path.appendPath(dirName); 1337 1338 start = mCache.indexOf(path); 1339 if (start == NAME_NOT_FOUND) { 1340 //printf("+++ not found in cache: dir '%s'\n", (const char*) path); 1341 delete pContents; 1342 return false; 1343 } 1344 1345 /* 1346 * The match string looks like "common/default/default/foo/bar/". 1347 * The '/' on the end ensures that we don't match on the directory 1348 * itself or on ".../foo/barfy/". 1349 */ 1350 path.append("/"); 1351 1352 count = mCache.size(); 1353 1354 /* 1355 * Pick out the stuff in the current dir by examining the pathname. 1356 * It needs to match the partial pathname prefix, and not have a '/' 1357 * (fssep) anywhere after the prefix. 1358 */ 1359 for (i = start+1; i < count; i++) { 1360 if (mCache[i].getFileName().length() > path.length() && 1361 strncmp(mCache[i].getFileName().string(), path.string(), path.length()) == 0) 1362 { 1363 const char* name = mCache[i].getFileName().string(); 1364 // XXX THIS IS BROKEN! Looks like we need to store the full 1365 // path prefix separately from the file path. 1366 if (strchr(name + path.length(), '/') == NULL) { 1367 /* grab it, reducing path to just the filename component */ 1368 AssetDir::FileInfo tmp = mCache[i]; 1369 tmp.setFileName(tmp.getFileName().getPathLeaf()); 1370 pContents->add(tmp); 1371 } 1372 } else { 1373 /* no longer in the dir or its subdirs */ 1374 break; 1375 } 1376 1377 } 1378 } else { 1379 path = createPathNameLocked(ap, rootDir); 1380 if (dirName[0] != '\0') 1381 path.appendPath(dirName); 1382 pContents = scanDirLocked(path); 1383 if (pContents == NULL) 1384 return false; 1385 } 1386 1387 // if we wanted to do an incremental cache fill, we would do it here 1388 1389 /* 1390 * Process "exclude" directives. If we find a filename that ends with 1391 * ".EXCLUDE", we look for a matching entry in the "merged" set, and 1392 * remove it if we find it. We also delete the "exclude" entry. 1393 */ 1394 int i, count, exclExtLen; 1395 1396 count = pContents->size(); 1397 exclExtLen = strlen(kExcludeExtension); 1398 for (i = 0; i < count; i++) { 1399 const char* name; 1400 int nameLen; 1401 1402 name = pContents->itemAt(i).getFileName().string(); 1403 nameLen = strlen(name); 1404 if (nameLen > exclExtLen && 1405 strcmp(name + (nameLen - exclExtLen), kExcludeExtension) == 0) 1406 { 1407 String8 match(name, nameLen - exclExtLen); 1408 int matchIdx; 1409 1410 matchIdx = AssetDir::FileInfo::findEntry(pMergedInfo, match); 1411 if (matchIdx > 0) { 1412 ALOGV("Excluding '%s' [%s]\n", 1413 pMergedInfo->itemAt(matchIdx).getFileName().string(), 1414 pMergedInfo->itemAt(matchIdx).getSourceName().string()); 1415 pMergedInfo->removeAt(matchIdx); 1416 } else { 1417 //printf("+++ no match on '%s'\n", (const char*) match); 1418 } 1419 1420 ALOGD("HEY: size=%d removing %d\n", (int)pContents->size(), i); 1421 pContents->removeAt(i); 1422 i--; // adjust "for" loop 1423 count--; // and loop limit 1424 } 1425 } 1426 1427 mergeInfoLocked(pMergedInfo, pContents); 1428 1429 delete pContents; 1430 1431 return true; 1432} 1433 1434/* 1435 * Scan the contents of the specified directory, and stuff what we find 1436 * into a newly-allocated vector. 1437 * 1438 * Files ending in ".gz" will have their extensions removed. 1439 * 1440 * We should probably think about skipping files with "illegal" names, 1441 * e.g. illegal characters (/\:) or excessive length. 1442 * 1443 * Returns NULL if the specified directory doesn't exist. 1444 */ 1445SortedVector<AssetDir::FileInfo>* AssetManager::scanDirLocked(const String8& path) 1446{ 1447 SortedVector<AssetDir::FileInfo>* pContents = NULL; 1448 DIR* dir; 1449 struct dirent* entry; 1450 FileType fileType; 1451 1452 ALOGV("Scanning dir '%s'\n", path.string()); 1453 1454 dir = opendir(path.string()); 1455 if (dir == NULL) 1456 return NULL; 1457 1458 pContents = new SortedVector<AssetDir::FileInfo>; 1459 1460 while (1) { 1461 entry = readdir(dir); 1462 if (entry == NULL) 1463 break; 1464 1465 if (strcmp(entry->d_name, ".") == 0 || 1466 strcmp(entry->d_name, "..") == 0) 1467 continue; 1468 1469#ifdef _DIRENT_HAVE_D_TYPE 1470 if (entry->d_type == DT_REG) 1471 fileType = kFileTypeRegular; 1472 else if (entry->d_type == DT_DIR) 1473 fileType = kFileTypeDirectory; 1474 else 1475 fileType = kFileTypeUnknown; 1476#else 1477 // stat the file 1478 fileType = ::getFileType(path.appendPathCopy(entry->d_name).string()); 1479#endif 1480 1481 if (fileType != kFileTypeRegular && fileType != kFileTypeDirectory) 1482 continue; 1483 1484 AssetDir::FileInfo info; 1485 info.set(String8(entry->d_name), fileType); 1486 if (strcasecmp(info.getFileName().getPathExtension().string(), ".gz") == 0) 1487 info.setFileName(info.getFileName().getBasePath()); 1488 info.setSourceName(path.appendPathCopy(info.getFileName())); 1489 pContents->add(info); 1490 } 1491 1492 closedir(dir); 1493 return pContents; 1494} 1495 1496/* 1497 * Scan the contents out of the specified Zip archive, and merge what we 1498 * find into "pMergedInfo". If the Zip archive in question doesn't exist, 1499 * we return immediately. 1500 * 1501 * Returns "false" if we found nothing to contribute. 1502 */ 1503bool AssetManager::scanAndMergeZipLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1504 const asset_path& ap, const char* rootDir, const char* baseDirName) 1505{ 1506 ZipFileRO* pZip; 1507 Vector<String8> dirs; 1508 AssetDir::FileInfo info; 1509 SortedVector<AssetDir::FileInfo> contents; 1510 String8 sourceName, zipName, dirName; 1511 1512 pZip = mZipSet.getZip(ap.path); 1513 if (pZip == NULL) { 1514 ALOGW("Failure opening zip %s\n", ap.path.string()); 1515 return false; 1516 } 1517 1518 zipName = ZipSet::getPathName(ap.path.string()); 1519 1520 /* convert "sounds" to "rootDir/sounds" */ 1521 if (rootDir != NULL) dirName = rootDir; 1522 dirName.appendPath(baseDirName); 1523 1524 /* 1525 * Scan through the list of files, looking for a match. The files in 1526 * the Zip table of contents are not in sorted order, so we have to 1527 * process the entire list. We're looking for a string that begins 1528 * with the characters in "dirName", is followed by a '/', and has no 1529 * subsequent '/' in the stuff that follows. 1530 * 1531 * What makes this especially fun is that directories are not stored 1532 * explicitly in Zip archives, so we have to infer them from context. 1533 * When we see "sounds/foo.wav" we have to leave a note to ourselves 1534 * to insert a directory called "sounds" into the list. We store 1535 * these in temporary vector so that we only return each one once. 1536 * 1537 * Name comparisons are case-sensitive to match UNIX filesystem 1538 * semantics. 1539 */ 1540 int dirNameLen = dirName.length(); 1541 void *iterationCookie; 1542 if (!pZip->startIteration(&iterationCookie, dirName.string(), NULL)) { 1543 ALOGW("ZipFileRO::startIteration returned false"); 1544 return false; 1545 } 1546 1547 ZipEntryRO entry; 1548 while ((entry = pZip->nextEntry(iterationCookie)) != NULL) { 1549 char nameBuf[256]; 1550 1551 if (pZip->getEntryFileName(entry, nameBuf, sizeof(nameBuf)) != 0) { 1552 // TODO: fix this if we expect to have long names 1553 ALOGE("ARGH: name too long?\n"); 1554 continue; 1555 } 1556 //printf("Comparing %s in %s?\n", nameBuf, dirName.string()); 1557 if (dirNameLen == 0 || nameBuf[dirNameLen] == '/') 1558 { 1559 const char* cp; 1560 const char* nextSlash; 1561 1562 cp = nameBuf + dirNameLen; 1563 if (dirNameLen != 0) 1564 cp++; // advance past the '/' 1565 1566 nextSlash = strchr(cp, '/'); 1567//xxx this may break if there are bare directory entries 1568 if (nextSlash == NULL) { 1569 /* this is a file in the requested directory */ 1570 1571 info.set(String8(nameBuf).getPathLeaf(), kFileTypeRegular); 1572 1573 info.setSourceName( 1574 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1575 1576 contents.add(info); 1577 //printf("FOUND: file '%s'\n", info.getFileName().string()); 1578 } else { 1579 /* this is a subdir; add it if we don't already have it*/ 1580 String8 subdirName(cp, nextSlash - cp); 1581 size_t j; 1582 size_t N = dirs.size(); 1583 1584 for (j = 0; j < N; j++) { 1585 if (subdirName == dirs[j]) { 1586 break; 1587 } 1588 } 1589 if (j == N) { 1590 dirs.add(subdirName); 1591 } 1592 1593 //printf("FOUND: dir '%s'\n", subdirName.string()); 1594 } 1595 } 1596 } 1597 1598 pZip->endIteration(iterationCookie); 1599 1600 /* 1601 * Add the set of unique directories. 1602 */ 1603 for (int i = 0; i < (int) dirs.size(); i++) { 1604 info.set(dirs[i], kFileTypeDirectory); 1605 info.setSourceName( 1606 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1607 contents.add(info); 1608 } 1609 1610 mergeInfoLocked(pMergedInfo, &contents); 1611 1612 return true; 1613} 1614 1615 1616/* 1617 * Merge two vectors of FileInfo. 1618 * 1619 * The merged contents will be stuffed into *pMergedInfo. 1620 * 1621 * If an entry for a file exists in both "pMergedInfo" and "pContents", 1622 * we use the newer "pContents" entry. 1623 */ 1624void AssetManager::mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1625 const SortedVector<AssetDir::FileInfo>* pContents) 1626{ 1627 /* 1628 * Merge what we found in this directory with what we found in 1629 * other places. 1630 * 1631 * Two basic approaches: 1632 * (1) Create a new array that holds the unique values of the two 1633 * arrays. 1634 * (2) Take the elements from pContents and shove them into pMergedInfo. 1635 * 1636 * Because these are vectors of complex objects, moving elements around 1637 * inside the vector requires constructing new objects and allocating 1638 * storage for members. With approach #1, we're always adding to the 1639 * end, whereas with #2 we could be inserting multiple elements at the 1640 * front of the vector. Approach #1 requires a full copy of the 1641 * contents of pMergedInfo, but approach #2 requires the same copy for 1642 * every insertion at the front of pMergedInfo. 1643 * 1644 * (We should probably use a SortedVector interface that allows us to 1645 * just stuff items in, trusting us to maintain the sort order.) 1646 */ 1647 SortedVector<AssetDir::FileInfo>* pNewSorted; 1648 int mergeMax, contMax; 1649 int mergeIdx, contIdx; 1650 1651 pNewSorted = new SortedVector<AssetDir::FileInfo>; 1652 mergeMax = pMergedInfo->size(); 1653 contMax = pContents->size(); 1654 mergeIdx = contIdx = 0; 1655 1656 while (mergeIdx < mergeMax || contIdx < contMax) { 1657 if (mergeIdx == mergeMax) { 1658 /* hit end of "merge" list, copy rest of "contents" */ 1659 pNewSorted->add(pContents->itemAt(contIdx)); 1660 contIdx++; 1661 } else if (contIdx == contMax) { 1662 /* hit end of "cont" list, copy rest of "merge" */ 1663 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1664 mergeIdx++; 1665 } else if (pMergedInfo->itemAt(mergeIdx) == pContents->itemAt(contIdx)) 1666 { 1667 /* items are identical, add newer and advance both indices */ 1668 pNewSorted->add(pContents->itemAt(contIdx)); 1669 mergeIdx++; 1670 contIdx++; 1671 } else if (pMergedInfo->itemAt(mergeIdx) < pContents->itemAt(contIdx)) 1672 { 1673 /* "merge" is lower, add that one */ 1674 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1675 mergeIdx++; 1676 } else { 1677 /* "cont" is lower, add that one */ 1678 assert(pContents->itemAt(contIdx) < pMergedInfo->itemAt(mergeIdx)); 1679 pNewSorted->add(pContents->itemAt(contIdx)); 1680 contIdx++; 1681 } 1682 } 1683 1684 /* 1685 * Overwrite the "merged" list with the new stuff. 1686 */ 1687 *pMergedInfo = *pNewSorted; 1688 delete pNewSorted; 1689 1690#if 0 // for Vector, rather than SortedVector 1691 int i, j; 1692 for (i = pContents->size() -1; i >= 0; i--) { 1693 bool add = true; 1694 1695 for (j = pMergedInfo->size() -1; j >= 0; j--) { 1696 /* case-sensitive comparisons, to behave like UNIX fs */ 1697 if (strcmp(pContents->itemAt(i).mFileName, 1698 pMergedInfo->itemAt(j).mFileName) == 0) 1699 { 1700 /* match, don't add this entry */ 1701 add = false; 1702 break; 1703 } 1704 } 1705 1706 if (add) 1707 pMergedInfo->add(pContents->itemAt(i)); 1708 } 1709#endif 1710} 1711 1712 1713/* 1714 * Load all files into the file name cache. We want to do this across 1715 * all combinations of { appname, locale, vendor }, performing a recursive 1716 * directory traversal. 1717 * 1718 * This is not the most efficient data structure. Also, gathering the 1719 * information as we needed it (file-by-file or directory-by-directory) 1720 * would be faster. However, on the actual device, 99% of the files will 1721 * live in Zip archives, so this list will be very small. The trouble 1722 * is that we have to check the "loose" files first, so it's important 1723 * that we don't beat the filesystem silly looking for files that aren't 1724 * there. 1725 * 1726 * Note on thread safety: this is the only function that causes updates 1727 * to mCache, and anybody who tries to use it will call here if !mCacheValid, 1728 * so we need to employ a mutex here. 1729 */ 1730void AssetManager::loadFileNameCacheLocked(void) 1731{ 1732 assert(!mCacheValid); 1733 assert(mCache.size() == 0); 1734 1735#ifdef DO_TIMINGS // need to link against -lrt for this now 1736 DurationTimer timer; 1737 timer.start(); 1738#endif 1739 1740 fncScanLocked(&mCache, ""); 1741 1742#ifdef DO_TIMINGS 1743 timer.stop(); 1744 ALOGD("Cache scan took %.3fms\n", 1745 timer.durationUsecs() / 1000.0); 1746#endif 1747 1748#if 0 1749 int i; 1750 printf("CACHED FILE LIST (%d entries):\n", mCache.size()); 1751 for (i = 0; i < (int) mCache.size(); i++) { 1752 printf(" %d: (%d) '%s'\n", i, 1753 mCache.itemAt(i).getFileType(), 1754 (const char*) mCache.itemAt(i).getFileName()); 1755 } 1756#endif 1757 1758 mCacheValid = true; 1759} 1760 1761/* 1762 * Scan up to 8 versions of the specified directory. 1763 */ 1764void AssetManager::fncScanLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1765 const char* dirName) 1766{ 1767 size_t i = mAssetPaths.size(); 1768 while (i > 0) { 1769 i--; 1770 const asset_path& ap = mAssetPaths.itemAt(i); 1771 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, NULL, dirName); 1772 if (mLocale != NULL) 1773 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, NULL, dirName); 1774 if (mVendor != NULL) 1775 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, mVendor, dirName); 1776 if (mLocale != NULL && mVendor != NULL) 1777 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, mVendor, dirName); 1778 } 1779} 1780 1781/* 1782 * Recursively scan this directory and all subdirs. 1783 * 1784 * This is similar to scanAndMergeDir, but we don't remove the .EXCLUDE 1785 * files, and we prepend the extended partial path to the filenames. 1786 */ 1787bool AssetManager::fncScanAndMergeDirLocked( 1788 SortedVector<AssetDir::FileInfo>* pMergedInfo, 1789 const asset_path& ap, const char* locale, const char* vendor, 1790 const char* dirName) 1791{ 1792 SortedVector<AssetDir::FileInfo>* pContents; 1793 String8 partialPath; 1794 String8 fullPath; 1795 1796 // XXX This is broken -- the filename cache needs to hold the base 1797 // asset path separately from its filename. 1798 1799 partialPath = createPathNameLocked(ap, locale, vendor); 1800 if (dirName[0] != '\0') { 1801 partialPath.appendPath(dirName); 1802 } 1803 1804 fullPath = partialPath; 1805 pContents = scanDirLocked(fullPath); 1806 if (pContents == NULL) { 1807 return false; // directory did not exist 1808 } 1809 1810 /* 1811 * Scan all subdirectories of the current dir, merging what we find 1812 * into "pMergedInfo". 1813 */ 1814 for (int i = 0; i < (int) pContents->size(); i++) { 1815 if (pContents->itemAt(i).getFileType() == kFileTypeDirectory) { 1816 String8 subdir(dirName); 1817 subdir.appendPath(pContents->itemAt(i).getFileName()); 1818 1819 fncScanAndMergeDirLocked(pMergedInfo, ap, locale, vendor, subdir.string()); 1820 } 1821 } 1822 1823 /* 1824 * To be consistent, we want entries for the root directory. If 1825 * we're the root, add one now. 1826 */ 1827 if (dirName[0] == '\0') { 1828 AssetDir::FileInfo tmpInfo; 1829 1830 tmpInfo.set(String8(""), kFileTypeDirectory); 1831 tmpInfo.setSourceName(createPathNameLocked(ap, locale, vendor)); 1832 pContents->add(tmpInfo); 1833 } 1834 1835 /* 1836 * We want to prepend the extended partial path to every entry in 1837 * "pContents". It's the same value for each entry, so this will 1838 * not change the sorting order of the vector contents. 1839 */ 1840 for (int i = 0; i < (int) pContents->size(); i++) { 1841 const AssetDir::FileInfo& info = pContents->itemAt(i); 1842 pContents->editItemAt(i).setFileName(partialPath.appendPathCopy(info.getFileName())); 1843 } 1844 1845 mergeInfoLocked(pMergedInfo, pContents); 1846 delete pContents; 1847 return true; 1848} 1849 1850/* 1851 * Trash the cache. 1852 */ 1853void AssetManager::purgeFileNameCacheLocked(void) 1854{ 1855 mCacheValid = false; 1856 mCache.clear(); 1857} 1858 1859/* 1860 * =========================================================================== 1861 * AssetManager::SharedZip 1862 * =========================================================================== 1863 */ 1864 1865 1866Mutex AssetManager::SharedZip::gLock; 1867DefaultKeyedVector<String8, wp<AssetManager::SharedZip> > AssetManager::SharedZip::gOpen; 1868 1869AssetManager::SharedZip::SharedZip(const String8& path, time_t modWhen) 1870 : mPath(path), mZipFile(NULL), mModWhen(modWhen), 1871 mResourceTableAsset(NULL), mResourceTable(NULL) 1872{ 1873 if (kIsDebug) { 1874 ALOGI("Creating SharedZip %p %s\n", this, (const char*)mPath); 1875 } 1876 ALOGV("+++ opening zip '%s'\n", mPath.string()); 1877 mZipFile = ZipFileRO::open(mPath.string()); 1878 if (mZipFile == NULL) { 1879 ALOGD("failed to open Zip archive '%s'\n", mPath.string()); 1880 } 1881} 1882 1883sp<AssetManager::SharedZip> AssetManager::SharedZip::get(const String8& path, 1884 bool createIfNotPresent) 1885{ 1886 AutoMutex _l(gLock); 1887 time_t modWhen = getFileModDate(path); 1888 sp<SharedZip> zip = gOpen.valueFor(path).promote(); 1889 if (zip != NULL && zip->mModWhen == modWhen) { 1890 return zip; 1891 } 1892 if (zip == NULL && !createIfNotPresent) { 1893 return NULL; 1894 } 1895 zip = new SharedZip(path, modWhen); 1896 gOpen.add(path, zip); 1897 return zip; 1898 1899} 1900 1901ZipFileRO* AssetManager::SharedZip::getZip() 1902{ 1903 return mZipFile; 1904} 1905 1906Asset* AssetManager::SharedZip::getResourceTableAsset() 1907{ 1908 AutoMutex _l(gLock); 1909 ALOGV("Getting from SharedZip %p resource asset %p\n", this, mResourceTableAsset); 1910 return mResourceTableAsset; 1911} 1912 1913Asset* AssetManager::SharedZip::setResourceTableAsset(Asset* asset) 1914{ 1915 { 1916 AutoMutex _l(gLock); 1917 if (mResourceTableAsset == NULL) { 1918 // This is not thread safe the first time it is called, so 1919 // do it here with the global lock held. 1920 asset->getBuffer(true); 1921 mResourceTableAsset = asset; 1922 return asset; 1923 } 1924 } 1925 delete asset; 1926 return mResourceTableAsset; 1927} 1928 1929ResTable* AssetManager::SharedZip::getResourceTable() 1930{ 1931 ALOGV("Getting from SharedZip %p resource table %p\n", this, mResourceTable); 1932 return mResourceTable; 1933} 1934 1935ResTable* AssetManager::SharedZip::setResourceTable(ResTable* res) 1936{ 1937 { 1938 AutoMutex _l(gLock); 1939 if (mResourceTable == NULL) { 1940 mResourceTable = res; 1941 return res; 1942 } 1943 } 1944 delete res; 1945 return mResourceTable; 1946} 1947 1948bool AssetManager::SharedZip::isUpToDate() 1949{ 1950 time_t modWhen = getFileModDate(mPath.string()); 1951 return mModWhen == modWhen; 1952} 1953 1954void AssetManager::SharedZip::addOverlay(const asset_path& ap) 1955{ 1956 mOverlays.add(ap); 1957} 1958 1959bool AssetManager::SharedZip::getOverlay(size_t idx, asset_path* out) const 1960{ 1961 if (idx >= mOverlays.size()) { 1962 return false; 1963 } 1964 *out = mOverlays[idx]; 1965 return true; 1966} 1967 1968AssetManager::SharedZip::~SharedZip() 1969{ 1970 if (kIsDebug) { 1971 ALOGI("Destroying SharedZip %p %s\n", this, (const char*)mPath); 1972 } 1973 if (mResourceTable != NULL) { 1974 delete mResourceTable; 1975 } 1976 if (mResourceTableAsset != NULL) { 1977 delete mResourceTableAsset; 1978 } 1979 if (mZipFile != NULL) { 1980 delete mZipFile; 1981 ALOGV("Closed '%s'\n", mPath.string()); 1982 } 1983} 1984 1985/* 1986 * =========================================================================== 1987 * AssetManager::ZipSet 1988 * =========================================================================== 1989 */ 1990 1991/* 1992 * Constructor. 1993 */ 1994AssetManager::ZipSet::ZipSet(void) 1995{ 1996} 1997 1998/* 1999 * Destructor. Close any open archives. 2000 */ 2001AssetManager::ZipSet::~ZipSet(void) 2002{ 2003 size_t N = mZipFile.size(); 2004 for (size_t i = 0; i < N; i++) 2005 closeZip(i); 2006} 2007 2008/* 2009 * Close a Zip file and reset the entry. 2010 */ 2011void AssetManager::ZipSet::closeZip(int idx) 2012{ 2013 mZipFile.editItemAt(idx) = NULL; 2014} 2015 2016 2017/* 2018 * Retrieve the appropriate Zip file from the set. 2019 */ 2020ZipFileRO* AssetManager::ZipSet::getZip(const String8& path) 2021{ 2022 int idx = getIndex(path); 2023 sp<SharedZip> zip = mZipFile[idx]; 2024 if (zip == NULL) { 2025 zip = SharedZip::get(path); 2026 mZipFile.editItemAt(idx) = zip; 2027 } 2028 return zip->getZip(); 2029} 2030 2031Asset* AssetManager::ZipSet::getZipResourceTableAsset(const String8& path) 2032{ 2033 int idx = getIndex(path); 2034 sp<SharedZip> zip = mZipFile[idx]; 2035 if (zip == NULL) { 2036 zip = SharedZip::get(path); 2037 mZipFile.editItemAt(idx) = zip; 2038 } 2039 return zip->getResourceTableAsset(); 2040} 2041 2042Asset* AssetManager::ZipSet::setZipResourceTableAsset(const String8& path, 2043 Asset* asset) 2044{ 2045 int idx = getIndex(path); 2046 sp<SharedZip> zip = mZipFile[idx]; 2047 // doesn't make sense to call before previously accessing. 2048 return zip->setResourceTableAsset(asset); 2049} 2050 2051ResTable* AssetManager::ZipSet::getZipResourceTable(const String8& path) 2052{ 2053 int idx = getIndex(path); 2054 sp<SharedZip> zip = mZipFile[idx]; 2055 if (zip == NULL) { 2056 zip = SharedZip::get(path); 2057 mZipFile.editItemAt(idx) = zip; 2058 } 2059 return zip->getResourceTable(); 2060} 2061 2062ResTable* AssetManager::ZipSet::setZipResourceTable(const String8& path, 2063 ResTable* res) 2064{ 2065 int idx = getIndex(path); 2066 sp<SharedZip> zip = mZipFile[idx]; 2067 // doesn't make sense to call before previously accessing. 2068 return zip->setResourceTable(res); 2069} 2070 2071/* 2072 * Generate the partial pathname for the specified archive. The caller 2073 * gets to prepend the asset root directory. 2074 * 2075 * Returns something like "common/en-US-noogle.jar". 2076 */ 2077/*static*/ String8 AssetManager::ZipSet::getPathName(const char* zipPath) 2078{ 2079 return String8(zipPath); 2080} 2081 2082bool AssetManager::ZipSet::isUpToDate() 2083{ 2084 const size_t N = mZipFile.size(); 2085 for (size_t i=0; i<N; i++) { 2086 if (mZipFile[i] != NULL && !mZipFile[i]->isUpToDate()) { 2087 return false; 2088 } 2089 } 2090 return true; 2091} 2092 2093void AssetManager::ZipSet::addOverlay(const String8& path, const asset_path& overlay) 2094{ 2095 int idx = getIndex(path); 2096 sp<SharedZip> zip = mZipFile[idx]; 2097 zip->addOverlay(overlay); 2098} 2099 2100bool AssetManager::ZipSet::getOverlay(const String8& path, size_t idx, asset_path* out) const 2101{ 2102 sp<SharedZip> zip = SharedZip::get(path, false); 2103 if (zip == NULL) { 2104 return false; 2105 } 2106 return zip->getOverlay(idx, out); 2107} 2108 2109/* 2110 * Compute the zip file's index. 2111 * 2112 * "appName", "locale", and "vendor" should be set to NULL to indicate the 2113 * default directory. 2114 */ 2115int AssetManager::ZipSet::getIndex(const String8& zip) const 2116{ 2117 const size_t N = mZipPath.size(); 2118 for (size_t i=0; i<N; i++) { 2119 if (mZipPath[i] == zip) { 2120 return i; 2121 } 2122 } 2123 2124 mZipPath.add(zip); 2125 mZipFile.add(NULL); 2126 2127 return mZipPath.size()-1; 2128} 2129