AssetManager.cpp revision e89a286541e242ad96705fcdd1fe2c6a9eafb4a0
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#ifdef HAVE_ANDROID_OS 38#include <cutils/trace.h> 39#endif 40 41#include <assert.h> 42#include <dirent.h> 43#include <errno.h> 44#include <string.h> // strerror 45#include <strings.h> 46 47#ifndef TEMP_FAILURE_RETRY 48/* Used to retry syscalls that can return EINTR. */ 49#define TEMP_FAILURE_RETRY(exp) ({ \ 50 typeof (exp) _rc; \ 51 do { \ 52 _rc = (exp); \ 53 } while (_rc == -1 && errno == EINTR); \ 54 _rc; }) 55#endif 56 57#ifdef HAVE_ANDROID_OS 58#define MY_TRACE_BEGIN(x) ATRACE_BEGIN(x) 59#define MY_TRACE_END() ATRACE_END() 60#else 61#define MY_TRACE_BEGIN(x) 62#define MY_TRACE_END() 63#endif 64 65using namespace android; 66 67static const bool kIsDebug = false; 68 69/* 70 * Names for default app, locale, and vendor. We might want to change 71 * these to be an actual locale, e.g. always use en-US as the default. 72 */ 73static const char* kDefaultLocale = "default"; 74static const char* kDefaultVendor = "default"; 75static const char* kAssetsRoot = "assets"; 76static const char* kAppZipName = NULL; //"classes.jar"; 77static const char* kSystemAssets = "framework/framework-res.apk"; 78static const char* kResourceCache = "resource-cache"; 79static const char* kAndroidManifest = "AndroidManifest.xml"; 80 81static const char* kExcludeExtension = ".EXCLUDE"; 82 83static Asset* const kExcludedAsset = (Asset*) 0xd000000d; 84 85static volatile int32_t gCount = 0; 86 87const char* AssetManager::RESOURCES_FILENAME = "resources.arsc"; 88const char* AssetManager::IDMAP_BIN = "/system/bin/idmap"; 89const char* AssetManager::OVERLAY_DIR = "/vendor/overlay"; 90const char* AssetManager::TARGET_PACKAGE_NAME = "android"; 91const char* AssetManager::TARGET_APK_PATH = "/system/framework/framework-res.apk"; 92const char* AssetManager::IDMAP_DIR = "/data/resource-cache"; 93 94namespace { 95 String8 idmapPathForPackagePath(const String8& pkgPath) 96 { 97 const char* root = getenv("ANDROID_DATA"); 98 LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_DATA not set"); 99 String8 path(root); 100 path.appendPath(kResourceCache); 101 102 char buf[256]; // 256 chars should be enough for anyone... 103 strncpy(buf, pkgPath.string(), 255); 104 buf[255] = '\0'; 105 char* filename = buf; 106 while (*filename && *filename == '/') { 107 ++filename; 108 } 109 char* p = filename; 110 while (*p) { 111 if (*p == '/') { 112 *p = '@'; 113 } 114 ++p; 115 } 116 path.appendPath(filename); 117 path.append("@idmap"); 118 119 return path; 120 } 121 122 /* 123 * Like strdup(), but uses C++ "new" operator instead of malloc. 124 */ 125 static char* strdupNew(const char* str) 126 { 127 char* newStr; 128 int len; 129 130 if (str == NULL) 131 return NULL; 132 133 len = strlen(str); 134 newStr = new char[len+1]; 135 memcpy(newStr, str, len+1); 136 137 return newStr; 138 } 139} 140 141/* 142 * =========================================================================== 143 * AssetManager 144 * =========================================================================== 145 */ 146 147int32_t AssetManager::getGlobalCount() 148{ 149 return gCount; 150} 151 152AssetManager::AssetManager(CacheMode cacheMode) 153 : mLocale(NULL), mVendor(NULL), 154 mResources(NULL), mConfig(new ResTable_config), 155 mCacheMode(cacheMode), mCacheValid(false) 156{ 157 int count = android_atomic_inc(&gCount) + 1; 158 if (kIsDebug) { 159 ALOGI("Creating AssetManager %p #%d\n", this, count); 160 } 161 memset(mConfig, 0, sizeof(ResTable_config)); 162} 163 164AssetManager::~AssetManager(void) 165{ 166 int count = android_atomic_dec(&gCount); 167 if (kIsDebug) { 168 ALOGI("Destroying AssetManager in %p #%d\n", this, count); 169 } 170 171 delete mConfig; 172 delete mResources; 173 174 // don't have a String class yet, so make sure we clean up 175 delete[] mLocale; 176 delete[] mVendor; 177} 178 179bool AssetManager::addAssetPath(const String8& path, int32_t* cookie) 180{ 181 AutoMutex _l(mLock); 182 183 asset_path ap; 184 185 String8 realPath(path); 186 if (kAppZipName) { 187 realPath.appendPath(kAppZipName); 188 } 189 ap.type = ::getFileType(realPath.string()); 190 if (ap.type == kFileTypeRegular) { 191 ap.path = realPath; 192 } else { 193 ap.path = path; 194 ap.type = ::getFileType(path.string()); 195 if (ap.type != kFileTypeDirectory && ap.type != kFileTypeRegular) { 196 ALOGW("Asset path %s is neither a directory nor file (type=%d).", 197 path.string(), (int)ap.type); 198 return false; 199 } 200 } 201 202 // Skip if we have it already. 203 for (size_t i=0; i<mAssetPaths.size(); i++) { 204 if (mAssetPaths[i].path == ap.path) { 205 if (cookie) { 206 *cookie = static_cast<int32_t>(i+1); 207 } 208 return true; 209 } 210 } 211 212 ALOGV("In %p Asset %s path: %s", this, 213 ap.type == kFileTypeDirectory ? "dir" : "zip", ap.path.string()); 214 215 // Check that the path has an AndroidManifest.xml 216 Asset* manifestAsset = const_cast<AssetManager*>(this)->openNonAssetInPathLocked( 217 kAndroidManifest, Asset::ACCESS_BUFFER, ap); 218 if (manifestAsset == NULL) { 219 // This asset path does not contain any resources. 220 delete manifestAsset; 221 return false; 222 } 223 delete manifestAsset; 224 225 mAssetPaths.add(ap); 226 227 // new paths are always added at the end 228 if (cookie) { 229 *cookie = static_cast<int32_t>(mAssetPaths.size()); 230 } 231 232#ifdef HAVE_ANDROID_OS 233 // Load overlays, if any 234 asset_path oap; 235 for (size_t idx = 0; mZipSet.getOverlay(ap.path, idx, &oap); idx++) { 236 mAssetPaths.add(oap); 237 } 238#endif 239 240 if (mResources != NULL) { 241 appendPathToResTable(ap); 242 } 243 244 return true; 245} 246 247bool AssetManager::addOverlayPath(const String8& packagePath, int32_t* cookie) 248{ 249 const String8 idmapPath = idmapPathForPackagePath(packagePath); 250 251 AutoMutex _l(mLock); 252 253 for (size_t i = 0; i < mAssetPaths.size(); ++i) { 254 if (mAssetPaths[i].idmap == idmapPath) { 255 *cookie = static_cast<int32_t>(i + 1); 256 return true; 257 } 258 } 259 260 Asset* idmap = NULL; 261 if ((idmap = openAssetFromFileLocked(idmapPath, Asset::ACCESS_BUFFER)) == NULL) { 262 ALOGW("failed to open idmap file %s\n", idmapPath.string()); 263 return false; 264 } 265 266 String8 targetPath; 267 String8 overlayPath; 268 if (!ResTable::getIdmapInfo(idmap->getBuffer(false), idmap->getLength(), 269 NULL, NULL, NULL, &targetPath, &overlayPath)) { 270 ALOGW("failed to read idmap file %s\n", idmapPath.string()); 271 delete idmap; 272 return false; 273 } 274 delete idmap; 275 276 if (overlayPath != packagePath) { 277 ALOGW("idmap file %s inconcistent: expected path %s does not match actual path %s\n", 278 idmapPath.string(), packagePath.string(), overlayPath.string()); 279 return false; 280 } 281 if (access(targetPath.string(), R_OK) != 0) { 282 ALOGW("failed to access file %s: %s\n", targetPath.string(), strerror(errno)); 283 return false; 284 } 285 if (access(idmapPath.string(), R_OK) != 0) { 286 ALOGW("failed to access file %s: %s\n", idmapPath.string(), strerror(errno)); 287 return false; 288 } 289 if (access(overlayPath.string(), R_OK) != 0) { 290 ALOGW("failed to access file %s: %s\n", overlayPath.string(), strerror(errno)); 291 return false; 292 } 293 294 asset_path oap; 295 oap.path = overlayPath; 296 oap.type = ::getFileType(overlayPath.string()); 297 oap.idmap = idmapPath; 298#if 0 299 ALOGD("Overlay added: targetPath=%s overlayPath=%s idmapPath=%s\n", 300 targetPath.string(), overlayPath.string(), idmapPath.string()); 301#endif 302 mAssetPaths.add(oap); 303 *cookie = static_cast<int32_t>(mAssetPaths.size()); 304 305 if (mResources != NULL) { 306 appendPathToResTable(oap); 307 } 308 309 return true; 310 } 311 312bool AssetManager::createIdmap(const char* targetApkPath, const char* overlayApkPath, 313 uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, size_t* outSize) 314{ 315 AutoMutex _l(mLock); 316 const String8 paths[2] = { String8(targetApkPath), String8(overlayApkPath) }; 317 ResTable tables[2]; 318 319 for (int i = 0; i < 2; ++i) { 320 asset_path ap; 321 ap.type = kFileTypeRegular; 322 ap.path = paths[i]; 323 Asset* ass = openNonAssetInPathLocked("resources.arsc", Asset::ACCESS_BUFFER, ap); 324 if (ass == NULL) { 325 ALOGW("failed to find resources.arsc in %s\n", ap.path.string()); 326 return false; 327 } 328 tables[i].add(ass); 329 } 330 331 return tables[0].createIdmap(tables[1], targetCrc, overlayCrc, 332 targetApkPath, overlayApkPath, (void**)outData, outSize) == NO_ERROR; 333} 334 335bool AssetManager::addDefaultAssets() 336{ 337 const char* root = getenv("ANDROID_ROOT"); 338 LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_ROOT not set"); 339 340 String8 path(root); 341 path.appendPath(kSystemAssets); 342 343 return addAssetPath(path, NULL); 344} 345 346int32_t AssetManager::nextAssetPath(const int32_t cookie) const 347{ 348 AutoMutex _l(mLock); 349 const size_t next = static_cast<size_t>(cookie) + 1; 350 return next > mAssetPaths.size() ? -1 : next; 351} 352 353String8 AssetManager::getAssetPath(const int32_t cookie) const 354{ 355 AutoMutex _l(mLock); 356 const size_t which = static_cast<size_t>(cookie) - 1; 357 if (which < mAssetPaths.size()) { 358 return mAssetPaths[which].path; 359 } 360 return String8(); 361} 362 363/* 364 * Set the current locale. Use NULL to indicate no locale. 365 * 366 * Close and reopen Zip archives as appropriate, and reset cached 367 * information in the locale-specific sections of the tree. 368 */ 369void AssetManager::setLocale(const char* locale) 370{ 371 AutoMutex _l(mLock); 372 setLocaleLocked(locale); 373} 374 375 376static const char kFilPrefix[] = "fil"; 377static const char kTlPrefix[] = "tl"; 378 379// The sizes of the prefixes, excluding the 0 suffix. 380// char. 381static const int kFilPrefixLen = sizeof(kFilPrefix) - 1; 382static const int kTlPrefixLen = sizeof(kTlPrefix) - 1; 383 384void AssetManager::setLocaleLocked(const char* locale) 385{ 386 if (mLocale != NULL) { 387 /* previously set, purge cached data */ 388 purgeFileNameCacheLocked(); 389 //mZipSet.purgeLocale(); 390 delete[] mLocale; 391 } 392 393 // If we're attempting to set a locale that starts with "fil", 394 // we should convert it to "tl" for backwards compatibility since 395 // we've been using "tl" instead of "fil" prior to L. 396 // 397 // If the resource table already has entries for "fil", we use that 398 // instead of attempting a fallback. 399 if (strncmp(locale, kFilPrefix, kFilPrefixLen) == 0) { 400 Vector<String8> locales; 401 ResTable* res = mResources; 402 if (res != NULL) { 403 res->getLocales(&locales); 404 } 405 const size_t localesSize = locales.size(); 406 bool hasFil = false; 407 for (size_t i = 0; i < localesSize; ++i) { 408 if (locales[i].find(kFilPrefix) == 0) { 409 hasFil = true; 410 break; 411 } 412 } 413 414 415 if (!hasFil) { 416 const size_t newLocaleLen = strlen(locale); 417 // This isn't a bug. We really do want mLocale to be 1 byte 418 // shorter than locale, because we're replacing "fil-" with 419 // "tl-". 420 mLocale = new char[newLocaleLen]; 421 // Copy over "tl". 422 memcpy(mLocale, kTlPrefix, kTlPrefixLen); 423 // Copy the rest of |locale|, including the terminating '\0'. 424 memcpy(mLocale + kTlPrefixLen, locale + kFilPrefixLen, 425 newLocaleLen - kFilPrefixLen + 1); 426 updateResourceParamsLocked(); 427 return; 428 } 429 } 430 431 mLocale = strdupNew(locale); 432 updateResourceParamsLocked(); 433} 434 435/* 436 * Set the current vendor. Use NULL to indicate no vendor. 437 * 438 * Close and reopen Zip archives as appropriate, and reset cached 439 * information in the vendor-specific sections of the tree. 440 */ 441void AssetManager::setVendor(const char* vendor) 442{ 443 AutoMutex _l(mLock); 444 445 if (mVendor != NULL) { 446 /* previously set, purge cached data */ 447 purgeFileNameCacheLocked(); 448 //mZipSet.purgeVendor(); 449 delete[] mVendor; 450 } 451 mVendor = strdupNew(vendor); 452} 453 454void AssetManager::setConfiguration(const ResTable_config& config, const char* locale) 455{ 456 AutoMutex _l(mLock); 457 *mConfig = config; 458 if (locale) { 459 setLocaleLocked(locale); 460 } else if (config.language[0] != 0) { 461 char spec[RESTABLE_MAX_LOCALE_LEN]; 462 config.getBcp47Locale(spec); 463 setLocaleLocked(spec); 464 } else { 465 updateResourceParamsLocked(); 466 } 467} 468 469void AssetManager::getConfiguration(ResTable_config* outConfig) const 470{ 471 AutoMutex _l(mLock); 472 *outConfig = *mConfig; 473} 474 475/* 476 * Open an asset. 477 * 478 * The data could be; 479 * - In a file on disk (assetBase + fileName). 480 * - In a compressed file on disk (assetBase + fileName.gz). 481 * - In a Zip archive, uncompressed or compressed. 482 * 483 * It can be in a number of different directories and Zip archives. 484 * The search order is: 485 * - [appname] 486 * - locale + vendor 487 * - "default" + vendor 488 * - locale + "default" 489 * - "default + "default" 490 * - "common" 491 * - (same as above) 492 * 493 * To find a particular file, we have to try up to eight paths with 494 * all three forms of data. 495 * 496 * We should probably reject requests for "illegal" filenames, e.g. those 497 * with illegal characters or "../" backward relative paths. 498 */ 499Asset* AssetManager::open(const char* fileName, AccessMode mode) 500{ 501 AutoMutex _l(mLock); 502 503 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 504 505 506 if (mCacheMode != CACHE_OFF && !mCacheValid) 507 loadFileNameCacheLocked(); 508 509 String8 assetName(kAssetsRoot); 510 assetName.appendPath(fileName); 511 512 /* 513 * For each top-level asset path, search for the asset. 514 */ 515 516 size_t i = mAssetPaths.size(); 517 while (i > 0) { 518 i--; 519 ALOGV("Looking for asset '%s' in '%s'\n", 520 assetName.string(), mAssetPaths.itemAt(i).path.string()); 521 Asset* pAsset = openNonAssetInPathLocked(assetName.string(), mode, mAssetPaths.itemAt(i)); 522 if (pAsset != NULL) { 523 return pAsset != kExcludedAsset ? pAsset : NULL; 524 } 525 } 526 527 return NULL; 528} 529 530/* 531 * Open a non-asset file as if it were an asset. 532 * 533 * The "fileName" is the partial path starting from the application 534 * name. 535 */ 536Asset* AssetManager::openNonAsset(const char* fileName, AccessMode mode, int32_t* outCookie) 537{ 538 AutoMutex _l(mLock); 539 540 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 541 542 543 if (mCacheMode != CACHE_OFF && !mCacheValid) 544 loadFileNameCacheLocked(); 545 546 /* 547 * For each top-level asset path, search for the asset. 548 */ 549 550 size_t i = mAssetPaths.size(); 551 while (i > 0) { 552 i--; 553 ALOGV("Looking for non-asset '%s' in '%s'\n", fileName, mAssetPaths.itemAt(i).path.string()); 554 Asset* pAsset = openNonAssetInPathLocked( 555 fileName, mode, mAssetPaths.itemAt(i)); 556 if (pAsset != NULL) { 557 if (outCookie != NULL) *outCookie = static_cast<int32_t>(i + 1); 558 return pAsset != kExcludedAsset ? pAsset : NULL; 559 } 560 } 561 562 return NULL; 563} 564 565Asset* AssetManager::openNonAsset(const int32_t cookie, const char* fileName, AccessMode mode) 566{ 567 const size_t which = static_cast<size_t>(cookie) - 1; 568 569 AutoMutex _l(mLock); 570 571 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 572 573 if (mCacheMode != CACHE_OFF && !mCacheValid) 574 loadFileNameCacheLocked(); 575 576 if (which < mAssetPaths.size()) { 577 ALOGV("Looking for non-asset '%s' in '%s'\n", fileName, 578 mAssetPaths.itemAt(which).path.string()); 579 Asset* pAsset = openNonAssetInPathLocked( 580 fileName, mode, mAssetPaths.itemAt(which)); 581 if (pAsset != NULL) { 582 return pAsset != kExcludedAsset ? pAsset : NULL; 583 } 584 } 585 586 return NULL; 587} 588 589/* 590 * Get the type of a file in the asset namespace. 591 * 592 * This currently only works for regular files. All others (including 593 * directories) will return kFileTypeNonexistent. 594 */ 595FileType AssetManager::getFileType(const char* fileName) 596{ 597 Asset* pAsset = NULL; 598 599 /* 600 * Open the asset. This is less efficient than simply finding the 601 * file, but it's not too bad (we don't uncompress or mmap data until 602 * the first read() call). 603 */ 604 pAsset = open(fileName, Asset::ACCESS_STREAMING); 605 delete pAsset; 606 607 if (pAsset == NULL) 608 return kFileTypeNonexistent; 609 else 610 return kFileTypeRegular; 611} 612 613bool AssetManager::appendPathToResTable(const asset_path& ap) const { 614 Asset* ass = NULL; 615 ResTable* sharedRes = NULL; 616 bool shared = true; 617 bool onlyEmptyResources = true; 618 MY_TRACE_BEGIN(ap.path.string()); 619 Asset* idmap = openIdmapLocked(ap); 620 size_t nextEntryIdx = mResources->getTableCount(); 621 ALOGV("Looking for resource asset in '%s'\n", ap.path.string()); 622 if (ap.type != kFileTypeDirectory) { 623 if (nextEntryIdx == 0) { 624 // The first item is typically the framework resources, 625 // which we want to avoid parsing every time. 626 sharedRes = const_cast<AssetManager*>(this)-> 627 mZipSet.getZipResourceTable(ap.path); 628 if (sharedRes != NULL) { 629 // skip ahead the number of system overlay packages preloaded 630 nextEntryIdx = sharedRes->getTableCount(); 631 } 632 } 633 if (sharedRes == NULL) { 634 ass = const_cast<AssetManager*>(this)-> 635 mZipSet.getZipResourceTableAsset(ap.path); 636 if (ass == NULL) { 637 ALOGV("loading resource table %s\n", ap.path.string()); 638 ass = const_cast<AssetManager*>(this)-> 639 openNonAssetInPathLocked("resources.arsc", 640 Asset::ACCESS_BUFFER, 641 ap); 642 if (ass != NULL && ass != kExcludedAsset) { 643 ass = const_cast<AssetManager*>(this)-> 644 mZipSet.setZipResourceTableAsset(ap.path, ass); 645 } 646 } 647 648 if (nextEntryIdx == 0 && ass != NULL) { 649 // If this is the first resource table in the asset 650 // manager, then we are going to cache it so that we 651 // can quickly copy it out for others. 652 ALOGV("Creating shared resources for %s", ap.path.string()); 653 sharedRes = new ResTable(); 654 sharedRes->add(ass, idmap, nextEntryIdx + 1, false); 655#ifdef HAVE_ANDROID_OS 656 const char* data = getenv("ANDROID_DATA"); 657 LOG_ALWAYS_FATAL_IF(data == NULL, "ANDROID_DATA not set"); 658 String8 overlaysListPath(data); 659 overlaysListPath.appendPath(kResourceCache); 660 overlaysListPath.appendPath("overlays.list"); 661 addSystemOverlays(overlaysListPath.string(), ap.path, sharedRes, nextEntryIdx); 662#endif 663 sharedRes = const_cast<AssetManager*>(this)-> 664 mZipSet.setZipResourceTable(ap.path, sharedRes); 665 } 666 } 667 } else { 668 ALOGV("loading resource table %s\n", ap.path.string()); 669 ass = const_cast<AssetManager*>(this)-> 670 openNonAssetInPathLocked("resources.arsc", 671 Asset::ACCESS_BUFFER, 672 ap); 673 shared = false; 674 } 675 676 if ((ass != NULL || sharedRes != NULL) && ass != kExcludedAsset) { 677 ALOGV("Installing resource asset %p in to table %p\n", ass, mResources); 678 if (sharedRes != NULL) { 679 ALOGV("Copying existing resources for %s", ap.path.string()); 680 mResources->add(sharedRes); 681 } else { 682 ALOGV("Parsing resources for %s", ap.path.string()); 683 mResources->add(ass, idmap, nextEntryIdx + 1, !shared); 684 } 685 onlyEmptyResources = false; 686 687 if (!shared) { 688 delete ass; 689 } 690 } else { 691 ALOGV("Installing empty resources in to table %p\n", mResources); 692 mResources->addEmpty(nextEntryIdx + 1); 693 } 694 695 if (idmap != NULL) { 696 delete idmap; 697 } 698 MY_TRACE_END(); 699 700 return onlyEmptyResources; 701} 702 703const ResTable* AssetManager::getResTable(bool required) const 704{ 705 ResTable* rt = mResources; 706 if (rt) { 707 return rt; 708 } 709 710 // Iterate through all asset packages, collecting resources from each. 711 712 AutoMutex _l(mLock); 713 714 if (mResources != NULL) { 715 return mResources; 716 } 717 718 if (required) { 719 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 720 } 721 722 if (mCacheMode != CACHE_OFF && !mCacheValid) { 723 const_cast<AssetManager*>(this)->loadFileNameCacheLocked(); 724 } 725 726 mResources = new ResTable(); 727 updateResourceParamsLocked(); 728 729 bool onlyEmptyResources = true; 730 const size_t N = mAssetPaths.size(); 731 for (size_t i=0; i<N; i++) { 732 bool empty = appendPathToResTable(mAssetPaths.itemAt(i)); 733 onlyEmptyResources = onlyEmptyResources && empty; 734 } 735 736 if (required && onlyEmptyResources) { 737 ALOGW("Unable to find resources file resources.arsc"); 738 delete mResources; 739 mResources = NULL; 740 } 741 742 return mResources; 743} 744 745void AssetManager::updateResourceParamsLocked() const 746{ 747 ResTable* res = mResources; 748 if (!res) { 749 return; 750 } 751 752 if (mLocale) { 753 mConfig->setBcp47Locale(mLocale); 754 } else { 755 mConfig->clearLocale(); 756 } 757 758 res->setParameters(mConfig); 759} 760 761Asset* AssetManager::openIdmapLocked(const struct asset_path& ap) const 762{ 763 Asset* ass = NULL; 764 if (ap.idmap.size() != 0) { 765 ass = const_cast<AssetManager*>(this)-> 766 openAssetFromFileLocked(ap.idmap, Asset::ACCESS_BUFFER); 767 if (ass) { 768 ALOGV("loading idmap %s\n", ap.idmap.string()); 769 } else { 770 ALOGW("failed to load idmap %s\n", ap.idmap.string()); 771 } 772 } 773 return ass; 774} 775 776void AssetManager::addSystemOverlays(const char* pathOverlaysList, 777 const String8& targetPackagePath, ResTable* sharedRes, size_t offset) const 778{ 779 FILE* fin = fopen(pathOverlaysList, "r"); 780 if (fin == NULL) { 781 return; 782 } 783 784 char buf[1024]; 785 while (fgets(buf, sizeof(buf), fin)) { 786 // format of each line: 787 // <path to apk><space><path to idmap><newline> 788 char* space = strchr(buf, ' '); 789 char* newline = strchr(buf, '\n'); 790 asset_path oap; 791 792 if (space == NULL || newline == NULL || newline < space) { 793 continue; 794 } 795 796 oap.path = String8(buf, space - buf); 797 oap.type = kFileTypeRegular; 798 oap.idmap = String8(space + 1, newline - space - 1); 799 800 Asset* oass = const_cast<AssetManager*>(this)-> 801 openNonAssetInPathLocked("resources.arsc", 802 Asset::ACCESS_BUFFER, 803 oap); 804 805 if (oass != NULL) { 806 Asset* oidmap = openIdmapLocked(oap); 807 offset++; 808 sharedRes->add(oass, oidmap, offset + 1, false); 809 const_cast<AssetManager*>(this)->mAssetPaths.add(oap); 810 const_cast<AssetManager*>(this)->mZipSet.addOverlay(targetPackagePath, oap); 811 } 812 } 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) const 829{ 830 ResTable* res = mResources; 831 if (res != NULL) { 832 res->getLocales(locales); 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 int method; 1154 size_t uncompressedLen; 1155 1156 //printf("USING Zip '%s'\n", pEntry->getFileName()); 1157 1158 //pZipFile->getEntryInfo(entry, &method, &uncompressedLen, &compressedLen, 1159 // &offset); 1160 if (!pZipFile->getEntryInfo(entry, &method, &uncompressedLen, NULL, NULL, 1161 NULL, NULL)) 1162 { 1163 ALOGW("getEntryInfo failed\n"); 1164 return NULL; 1165 } 1166 1167 FileMap* dataMap = pZipFile->createEntryFileMap(entry); 1168 if (dataMap == NULL) { 1169 ALOGW("create map from entry failed\n"); 1170 return NULL; 1171 } 1172 1173 if (method == ZipFileRO::kCompressStored) { 1174 pAsset = Asset::createFromUncompressedMap(dataMap, mode); 1175 ALOGV("Opened uncompressed entry %s in zip %s mode %d: %p", entryName.string(), 1176 dataMap->getFileName(), mode, pAsset); 1177 } else { 1178 pAsset = Asset::createFromCompressedMap(dataMap, method, 1179 uncompressedLen, mode); 1180 ALOGV("Opened compressed entry %s in zip %s mode %d: %p", entryName.string(), 1181 dataMap->getFileName(), mode, pAsset); 1182 } 1183 if (pAsset == NULL) { 1184 /* unexpected */ 1185 ALOGW("create from segment failed\n"); 1186 } 1187 1188 return pAsset; 1189} 1190 1191 1192 1193/* 1194 * Open a directory in the asset namespace. 1195 * 1196 * An "asset directory" is simply the combination of all files in all 1197 * locations, with ".gz" stripped for loose files. With app, locale, and 1198 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1199 * 1200 * Pass in "" for the root dir. 1201 */ 1202AssetDir* AssetManager::openDir(const char* dirName) 1203{ 1204 AutoMutex _l(mLock); 1205 1206 AssetDir* pDir = NULL; 1207 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1208 1209 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1210 assert(dirName != NULL); 1211 1212 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1213 1214 if (mCacheMode != CACHE_OFF && !mCacheValid) 1215 loadFileNameCacheLocked(); 1216 1217 pDir = new AssetDir; 1218 1219 /* 1220 * Scan the various directories, merging what we find into a single 1221 * vector. We want to scan them in reverse priority order so that 1222 * the ".EXCLUDE" processing works correctly. Also, if we decide we 1223 * want to remember where the file is coming from, we'll get the right 1224 * version. 1225 * 1226 * We start with Zip archives, then do loose files. 1227 */ 1228 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1229 1230 size_t i = mAssetPaths.size(); 1231 while (i > 0) { 1232 i--; 1233 const asset_path& ap = mAssetPaths.itemAt(i); 1234 if (ap.type == kFileTypeRegular) { 1235 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1236 scanAndMergeZipLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1237 } else { 1238 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1239 scanAndMergeDirLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1240 } 1241 } 1242 1243#if 0 1244 printf("FILE LIST:\n"); 1245 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1246 printf(" %d: (%d) '%s'\n", i, 1247 pMergedInfo->itemAt(i).getFileType(), 1248 (const char*) pMergedInfo->itemAt(i).getFileName()); 1249 } 1250#endif 1251 1252 pDir->setFileList(pMergedInfo); 1253 return pDir; 1254} 1255 1256/* 1257 * Open a directory in the non-asset namespace. 1258 * 1259 * An "asset directory" is simply the combination of all files in all 1260 * locations, with ".gz" stripped for loose files. With app, locale, and 1261 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1262 * 1263 * Pass in "" for the root dir. 1264 */ 1265AssetDir* AssetManager::openNonAssetDir(const int32_t cookie, const char* dirName) 1266{ 1267 AutoMutex _l(mLock); 1268 1269 AssetDir* pDir = NULL; 1270 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1271 1272 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1273 assert(dirName != NULL); 1274 1275 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1276 1277 if (mCacheMode != CACHE_OFF && !mCacheValid) 1278 loadFileNameCacheLocked(); 1279 1280 pDir = new AssetDir; 1281 1282 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1283 1284 const size_t which = static_cast<size_t>(cookie) - 1; 1285 1286 if (which < mAssetPaths.size()) { 1287 const asset_path& ap = mAssetPaths.itemAt(which); 1288 if (ap.type == kFileTypeRegular) { 1289 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1290 scanAndMergeZipLocked(pMergedInfo, ap, NULL, dirName); 1291 } else { 1292 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1293 scanAndMergeDirLocked(pMergedInfo, ap, NULL, dirName); 1294 } 1295 } 1296 1297#if 0 1298 printf("FILE LIST:\n"); 1299 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1300 printf(" %d: (%d) '%s'\n", i, 1301 pMergedInfo->itemAt(i).getFileType(), 1302 (const char*) pMergedInfo->itemAt(i).getFileName()); 1303 } 1304#endif 1305 1306 pDir->setFileList(pMergedInfo); 1307 return pDir; 1308} 1309 1310/* 1311 * Scan the contents of the specified directory and merge them into the 1312 * "pMergedInfo" vector, removing previous entries if we find "exclude" 1313 * directives. 1314 * 1315 * Returns "false" if we found nothing to contribute. 1316 */ 1317bool AssetManager::scanAndMergeDirLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1318 const asset_path& ap, const char* rootDir, const char* dirName) 1319{ 1320 SortedVector<AssetDir::FileInfo>* pContents; 1321 String8 path; 1322 1323 assert(pMergedInfo != NULL); 1324 1325 //printf("scanAndMergeDir: %s %s %s %s\n", appName, locale, vendor,dirName); 1326 1327 if (mCacheValid) { 1328 int i, start, count; 1329 1330 pContents = new SortedVector<AssetDir::FileInfo>; 1331 1332 /* 1333 * Get the basic partial path and find it in the cache. That's 1334 * the start point for the search. 1335 */ 1336 path = createPathNameLocked(ap, rootDir); 1337 if (dirName[0] != '\0') 1338 path.appendPath(dirName); 1339 1340 start = mCache.indexOf(path); 1341 if (start == NAME_NOT_FOUND) { 1342 //printf("+++ not found in cache: dir '%s'\n", (const char*) path); 1343 delete pContents; 1344 return false; 1345 } 1346 1347 /* 1348 * The match string looks like "common/default/default/foo/bar/". 1349 * The '/' on the end ensures that we don't match on the directory 1350 * itself or on ".../foo/barfy/". 1351 */ 1352 path.append("/"); 1353 1354 count = mCache.size(); 1355 1356 /* 1357 * Pick out the stuff in the current dir by examining the pathname. 1358 * It needs to match the partial pathname prefix, and not have a '/' 1359 * (fssep) anywhere after the prefix. 1360 */ 1361 for (i = start+1; i < count; i++) { 1362 if (mCache[i].getFileName().length() > path.length() && 1363 strncmp(mCache[i].getFileName().string(), path.string(), path.length()) == 0) 1364 { 1365 const char* name = mCache[i].getFileName().string(); 1366 // XXX THIS IS BROKEN! Looks like we need to store the full 1367 // path prefix separately from the file path. 1368 if (strchr(name + path.length(), '/') == NULL) { 1369 /* grab it, reducing path to just the filename component */ 1370 AssetDir::FileInfo tmp = mCache[i]; 1371 tmp.setFileName(tmp.getFileName().getPathLeaf()); 1372 pContents->add(tmp); 1373 } 1374 } else { 1375 /* no longer in the dir or its subdirs */ 1376 break; 1377 } 1378 1379 } 1380 } else { 1381 path = createPathNameLocked(ap, rootDir); 1382 if (dirName[0] != '\0') 1383 path.appendPath(dirName); 1384 pContents = scanDirLocked(path); 1385 if (pContents == NULL) 1386 return false; 1387 } 1388 1389 // if we wanted to do an incremental cache fill, we would do it here 1390 1391 /* 1392 * Process "exclude" directives. If we find a filename that ends with 1393 * ".EXCLUDE", we look for a matching entry in the "merged" set, and 1394 * remove it if we find it. We also delete the "exclude" entry. 1395 */ 1396 int i, count, exclExtLen; 1397 1398 count = pContents->size(); 1399 exclExtLen = strlen(kExcludeExtension); 1400 for (i = 0; i < count; i++) { 1401 const char* name; 1402 int nameLen; 1403 1404 name = pContents->itemAt(i).getFileName().string(); 1405 nameLen = strlen(name); 1406 if (nameLen > exclExtLen && 1407 strcmp(name + (nameLen - exclExtLen), kExcludeExtension) == 0) 1408 { 1409 String8 match(name, nameLen - exclExtLen); 1410 int matchIdx; 1411 1412 matchIdx = AssetDir::FileInfo::findEntry(pMergedInfo, match); 1413 if (matchIdx > 0) { 1414 ALOGV("Excluding '%s' [%s]\n", 1415 pMergedInfo->itemAt(matchIdx).getFileName().string(), 1416 pMergedInfo->itemAt(matchIdx).getSourceName().string()); 1417 pMergedInfo->removeAt(matchIdx); 1418 } else { 1419 //printf("+++ no match on '%s'\n", (const char*) match); 1420 } 1421 1422 ALOGD("HEY: size=%d removing %d\n", (int)pContents->size(), i); 1423 pContents->removeAt(i); 1424 i--; // adjust "for" loop 1425 count--; // and loop limit 1426 } 1427 } 1428 1429 mergeInfoLocked(pMergedInfo, pContents); 1430 1431 delete pContents; 1432 1433 return true; 1434} 1435 1436/* 1437 * Scan the contents of the specified directory, and stuff what we find 1438 * into a newly-allocated vector. 1439 * 1440 * Files ending in ".gz" will have their extensions removed. 1441 * 1442 * We should probably think about skipping files with "illegal" names, 1443 * e.g. illegal characters (/\:) or excessive length. 1444 * 1445 * Returns NULL if the specified directory doesn't exist. 1446 */ 1447SortedVector<AssetDir::FileInfo>* AssetManager::scanDirLocked(const String8& path) 1448{ 1449 SortedVector<AssetDir::FileInfo>* pContents = NULL; 1450 DIR* dir; 1451 struct dirent* entry; 1452 FileType fileType; 1453 1454 ALOGV("Scanning dir '%s'\n", path.string()); 1455 1456 dir = opendir(path.string()); 1457 if (dir == NULL) 1458 return NULL; 1459 1460 pContents = new SortedVector<AssetDir::FileInfo>; 1461 1462 while (1) { 1463 entry = readdir(dir); 1464 if (entry == NULL) 1465 break; 1466 1467 if (strcmp(entry->d_name, ".") == 0 || 1468 strcmp(entry->d_name, "..") == 0) 1469 continue; 1470 1471#ifdef _DIRENT_HAVE_D_TYPE 1472 if (entry->d_type == DT_REG) 1473 fileType = kFileTypeRegular; 1474 else if (entry->d_type == DT_DIR) 1475 fileType = kFileTypeDirectory; 1476 else 1477 fileType = kFileTypeUnknown; 1478#else 1479 // stat the file 1480 fileType = ::getFileType(path.appendPathCopy(entry->d_name).string()); 1481#endif 1482 1483 if (fileType != kFileTypeRegular && fileType != kFileTypeDirectory) 1484 continue; 1485 1486 AssetDir::FileInfo info; 1487 info.set(String8(entry->d_name), fileType); 1488 if (strcasecmp(info.getFileName().getPathExtension().string(), ".gz") == 0) 1489 info.setFileName(info.getFileName().getBasePath()); 1490 info.setSourceName(path.appendPathCopy(info.getFileName())); 1491 pContents->add(info); 1492 } 1493 1494 closedir(dir); 1495 return pContents; 1496} 1497 1498/* 1499 * Scan the contents out of the specified Zip archive, and merge what we 1500 * find into "pMergedInfo". If the Zip archive in question doesn't exist, 1501 * we return immediately. 1502 * 1503 * Returns "false" if we found nothing to contribute. 1504 */ 1505bool AssetManager::scanAndMergeZipLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1506 const asset_path& ap, const char* rootDir, const char* baseDirName) 1507{ 1508 ZipFileRO* pZip; 1509 Vector<String8> dirs; 1510 AssetDir::FileInfo info; 1511 SortedVector<AssetDir::FileInfo> contents; 1512 String8 sourceName, zipName, dirName; 1513 1514 pZip = mZipSet.getZip(ap.path); 1515 if (pZip == NULL) { 1516 ALOGW("Failure opening zip %s\n", ap.path.string()); 1517 return false; 1518 } 1519 1520 zipName = ZipSet::getPathName(ap.path.string()); 1521 1522 /* convert "sounds" to "rootDir/sounds" */ 1523 if (rootDir != NULL) dirName = rootDir; 1524 dirName.appendPath(baseDirName); 1525 1526 /* 1527 * Scan through the list of files, looking for a match. The files in 1528 * the Zip table of contents are not in sorted order, so we have to 1529 * process the entire list. We're looking for a string that begins 1530 * with the characters in "dirName", is followed by a '/', and has no 1531 * subsequent '/' in the stuff that follows. 1532 * 1533 * What makes this especially fun is that directories are not stored 1534 * explicitly in Zip archives, so we have to infer them from context. 1535 * When we see "sounds/foo.wav" we have to leave a note to ourselves 1536 * to insert a directory called "sounds" into the list. We store 1537 * these in temporary vector so that we only return each one once. 1538 * 1539 * Name comparisons are case-sensitive to match UNIX filesystem 1540 * semantics. 1541 */ 1542 int dirNameLen = dirName.length(); 1543 void *iterationCookie; 1544 if (!pZip->startIteration(&iterationCookie)) { 1545 ALOGW("ZipFileRO::startIteration returned false"); 1546 return false; 1547 } 1548 1549 ZipEntryRO entry; 1550 while ((entry = pZip->nextEntry(iterationCookie)) != NULL) { 1551 char nameBuf[256]; 1552 1553 if (pZip->getEntryFileName(entry, nameBuf, sizeof(nameBuf)) != 0) { 1554 // TODO: fix this if we expect to have long names 1555 ALOGE("ARGH: name too long?\n"); 1556 continue; 1557 } 1558 //printf("Comparing %s in %s?\n", nameBuf, dirName.string()); 1559 if (dirNameLen == 0 || 1560 (strncmp(nameBuf, dirName.string(), dirNameLen) == 0 && 1561 nameBuf[dirNameLen] == '/')) 1562 { 1563 const char* cp; 1564 const char* nextSlash; 1565 1566 cp = nameBuf + dirNameLen; 1567 if (dirNameLen != 0) 1568 cp++; // advance past the '/' 1569 1570 nextSlash = strchr(cp, '/'); 1571//xxx this may break if there are bare directory entries 1572 if (nextSlash == NULL) { 1573 /* this is a file in the requested directory */ 1574 1575 info.set(String8(nameBuf).getPathLeaf(), kFileTypeRegular); 1576 1577 info.setSourceName( 1578 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1579 1580 contents.add(info); 1581 //printf("FOUND: file '%s'\n", info.getFileName().string()); 1582 } else { 1583 /* this is a subdir; add it if we don't already have it*/ 1584 String8 subdirName(cp, nextSlash - cp); 1585 size_t j; 1586 size_t N = dirs.size(); 1587 1588 for (j = 0; j < N; j++) { 1589 if (subdirName == dirs[j]) { 1590 break; 1591 } 1592 } 1593 if (j == N) { 1594 dirs.add(subdirName); 1595 } 1596 1597 //printf("FOUND: dir '%s'\n", subdirName.string()); 1598 } 1599 } 1600 } 1601 1602 pZip->endIteration(iterationCookie); 1603 1604 /* 1605 * Add the set of unique directories. 1606 */ 1607 for (int i = 0; i < (int) dirs.size(); i++) { 1608 info.set(dirs[i], kFileTypeDirectory); 1609 info.setSourceName( 1610 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1611 contents.add(info); 1612 } 1613 1614 mergeInfoLocked(pMergedInfo, &contents); 1615 1616 return true; 1617} 1618 1619 1620/* 1621 * Merge two vectors of FileInfo. 1622 * 1623 * The merged contents will be stuffed into *pMergedInfo. 1624 * 1625 * If an entry for a file exists in both "pMergedInfo" and "pContents", 1626 * we use the newer "pContents" entry. 1627 */ 1628void AssetManager::mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1629 const SortedVector<AssetDir::FileInfo>* pContents) 1630{ 1631 /* 1632 * Merge what we found in this directory with what we found in 1633 * other places. 1634 * 1635 * Two basic approaches: 1636 * (1) Create a new array that holds the unique values of the two 1637 * arrays. 1638 * (2) Take the elements from pContents and shove them into pMergedInfo. 1639 * 1640 * Because these are vectors of complex objects, moving elements around 1641 * inside the vector requires constructing new objects and allocating 1642 * storage for members. With approach #1, we're always adding to the 1643 * end, whereas with #2 we could be inserting multiple elements at the 1644 * front of the vector. Approach #1 requires a full copy of the 1645 * contents of pMergedInfo, but approach #2 requires the same copy for 1646 * every insertion at the front of pMergedInfo. 1647 * 1648 * (We should probably use a SortedVector interface that allows us to 1649 * just stuff items in, trusting us to maintain the sort order.) 1650 */ 1651 SortedVector<AssetDir::FileInfo>* pNewSorted; 1652 int mergeMax, contMax; 1653 int mergeIdx, contIdx; 1654 1655 pNewSorted = new SortedVector<AssetDir::FileInfo>; 1656 mergeMax = pMergedInfo->size(); 1657 contMax = pContents->size(); 1658 mergeIdx = contIdx = 0; 1659 1660 while (mergeIdx < mergeMax || contIdx < contMax) { 1661 if (mergeIdx == mergeMax) { 1662 /* hit end of "merge" list, copy rest of "contents" */ 1663 pNewSorted->add(pContents->itemAt(contIdx)); 1664 contIdx++; 1665 } else if (contIdx == contMax) { 1666 /* hit end of "cont" list, copy rest of "merge" */ 1667 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1668 mergeIdx++; 1669 } else if (pMergedInfo->itemAt(mergeIdx) == pContents->itemAt(contIdx)) 1670 { 1671 /* items are identical, add newer and advance both indices */ 1672 pNewSorted->add(pContents->itemAt(contIdx)); 1673 mergeIdx++; 1674 contIdx++; 1675 } else if (pMergedInfo->itemAt(mergeIdx) < pContents->itemAt(contIdx)) 1676 { 1677 /* "merge" is lower, add that one */ 1678 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1679 mergeIdx++; 1680 } else { 1681 /* "cont" is lower, add that one */ 1682 assert(pContents->itemAt(contIdx) < pMergedInfo->itemAt(mergeIdx)); 1683 pNewSorted->add(pContents->itemAt(contIdx)); 1684 contIdx++; 1685 } 1686 } 1687 1688 /* 1689 * Overwrite the "merged" list with the new stuff. 1690 */ 1691 *pMergedInfo = *pNewSorted; 1692 delete pNewSorted; 1693 1694#if 0 // for Vector, rather than SortedVector 1695 int i, j; 1696 for (i = pContents->size() -1; i >= 0; i--) { 1697 bool add = true; 1698 1699 for (j = pMergedInfo->size() -1; j >= 0; j--) { 1700 /* case-sensitive comparisons, to behave like UNIX fs */ 1701 if (strcmp(pContents->itemAt(i).mFileName, 1702 pMergedInfo->itemAt(j).mFileName) == 0) 1703 { 1704 /* match, don't add this entry */ 1705 add = false; 1706 break; 1707 } 1708 } 1709 1710 if (add) 1711 pMergedInfo->add(pContents->itemAt(i)); 1712 } 1713#endif 1714} 1715 1716 1717/* 1718 * Load all files into the file name cache. We want to do this across 1719 * all combinations of { appname, locale, vendor }, performing a recursive 1720 * directory traversal. 1721 * 1722 * This is not the most efficient data structure. Also, gathering the 1723 * information as we needed it (file-by-file or directory-by-directory) 1724 * would be faster. However, on the actual device, 99% of the files will 1725 * live in Zip archives, so this list will be very small. The trouble 1726 * is that we have to check the "loose" files first, so it's important 1727 * that we don't beat the filesystem silly looking for files that aren't 1728 * there. 1729 * 1730 * Note on thread safety: this is the only function that causes updates 1731 * to mCache, and anybody who tries to use it will call here if !mCacheValid, 1732 * so we need to employ a mutex here. 1733 */ 1734void AssetManager::loadFileNameCacheLocked(void) 1735{ 1736 assert(!mCacheValid); 1737 assert(mCache.size() == 0); 1738 1739#ifdef DO_TIMINGS // need to link against -lrt for this now 1740 DurationTimer timer; 1741 timer.start(); 1742#endif 1743 1744 fncScanLocked(&mCache, ""); 1745 1746#ifdef DO_TIMINGS 1747 timer.stop(); 1748 ALOGD("Cache scan took %.3fms\n", 1749 timer.durationUsecs() / 1000.0); 1750#endif 1751 1752#if 0 1753 int i; 1754 printf("CACHED FILE LIST (%d entries):\n", mCache.size()); 1755 for (i = 0; i < (int) mCache.size(); i++) { 1756 printf(" %d: (%d) '%s'\n", i, 1757 mCache.itemAt(i).getFileType(), 1758 (const char*) mCache.itemAt(i).getFileName()); 1759 } 1760#endif 1761 1762 mCacheValid = true; 1763} 1764 1765/* 1766 * Scan up to 8 versions of the specified directory. 1767 */ 1768void AssetManager::fncScanLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1769 const char* dirName) 1770{ 1771 size_t i = mAssetPaths.size(); 1772 while (i > 0) { 1773 i--; 1774 const asset_path& ap = mAssetPaths.itemAt(i); 1775 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, NULL, dirName); 1776 if (mLocale != NULL) 1777 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, NULL, dirName); 1778 if (mVendor != NULL) 1779 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, mVendor, dirName); 1780 if (mLocale != NULL && mVendor != NULL) 1781 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, mVendor, dirName); 1782 } 1783} 1784 1785/* 1786 * Recursively scan this directory and all subdirs. 1787 * 1788 * This is similar to scanAndMergeDir, but we don't remove the .EXCLUDE 1789 * files, and we prepend the extended partial path to the filenames. 1790 */ 1791bool AssetManager::fncScanAndMergeDirLocked( 1792 SortedVector<AssetDir::FileInfo>* pMergedInfo, 1793 const asset_path& ap, const char* locale, const char* vendor, 1794 const char* dirName) 1795{ 1796 SortedVector<AssetDir::FileInfo>* pContents; 1797 String8 partialPath; 1798 String8 fullPath; 1799 1800 // XXX This is broken -- the filename cache needs to hold the base 1801 // asset path separately from its filename. 1802 1803 partialPath = createPathNameLocked(ap, locale, vendor); 1804 if (dirName[0] != '\0') { 1805 partialPath.appendPath(dirName); 1806 } 1807 1808 fullPath = partialPath; 1809 pContents = scanDirLocked(fullPath); 1810 if (pContents == NULL) { 1811 return false; // directory did not exist 1812 } 1813 1814 /* 1815 * Scan all subdirectories of the current dir, merging what we find 1816 * into "pMergedInfo". 1817 */ 1818 for (int i = 0; i < (int) pContents->size(); i++) { 1819 if (pContents->itemAt(i).getFileType() == kFileTypeDirectory) { 1820 String8 subdir(dirName); 1821 subdir.appendPath(pContents->itemAt(i).getFileName()); 1822 1823 fncScanAndMergeDirLocked(pMergedInfo, ap, locale, vendor, subdir.string()); 1824 } 1825 } 1826 1827 /* 1828 * To be consistent, we want entries for the root directory. If 1829 * we're the root, add one now. 1830 */ 1831 if (dirName[0] == '\0') { 1832 AssetDir::FileInfo tmpInfo; 1833 1834 tmpInfo.set(String8(""), kFileTypeDirectory); 1835 tmpInfo.setSourceName(createPathNameLocked(ap, locale, vendor)); 1836 pContents->add(tmpInfo); 1837 } 1838 1839 /* 1840 * We want to prepend the extended partial path to every entry in 1841 * "pContents". It's the same value for each entry, so this will 1842 * not change the sorting order of the vector contents. 1843 */ 1844 for (int i = 0; i < (int) pContents->size(); i++) { 1845 const AssetDir::FileInfo& info = pContents->itemAt(i); 1846 pContents->editItemAt(i).setFileName(partialPath.appendPathCopy(info.getFileName())); 1847 } 1848 1849 mergeInfoLocked(pMergedInfo, pContents); 1850 delete pContents; 1851 return true; 1852} 1853 1854/* 1855 * Trash the cache. 1856 */ 1857void AssetManager::purgeFileNameCacheLocked(void) 1858{ 1859 mCacheValid = false; 1860 mCache.clear(); 1861} 1862 1863/* 1864 * =========================================================================== 1865 * AssetManager::SharedZip 1866 * =========================================================================== 1867 */ 1868 1869 1870Mutex AssetManager::SharedZip::gLock; 1871DefaultKeyedVector<String8, wp<AssetManager::SharedZip> > AssetManager::SharedZip::gOpen; 1872 1873AssetManager::SharedZip::SharedZip(const String8& path, time_t modWhen) 1874 : mPath(path), mZipFile(NULL), mModWhen(modWhen), 1875 mResourceTableAsset(NULL), mResourceTable(NULL) 1876{ 1877 if (kIsDebug) { 1878 ALOGI("Creating SharedZip %p %s\n", this, (const char*)mPath); 1879 } 1880 ALOGV("+++ opening zip '%s'\n", mPath.string()); 1881 mZipFile = ZipFileRO::open(mPath.string()); 1882 if (mZipFile == NULL) { 1883 ALOGD("failed to open Zip archive '%s'\n", mPath.string()); 1884 } 1885} 1886 1887sp<AssetManager::SharedZip> AssetManager::SharedZip::get(const String8& path, 1888 bool createIfNotPresent) 1889{ 1890 AutoMutex _l(gLock); 1891 time_t modWhen = getFileModDate(path); 1892 sp<SharedZip> zip = gOpen.valueFor(path).promote(); 1893 if (zip != NULL && zip->mModWhen == modWhen) { 1894 return zip; 1895 } 1896 if (zip == NULL && !createIfNotPresent) { 1897 return NULL; 1898 } 1899 zip = new SharedZip(path, modWhen); 1900 gOpen.add(path, zip); 1901 return zip; 1902 1903} 1904 1905ZipFileRO* AssetManager::SharedZip::getZip() 1906{ 1907 return mZipFile; 1908} 1909 1910Asset* AssetManager::SharedZip::getResourceTableAsset() 1911{ 1912 ALOGV("Getting from SharedZip %p resource asset %p\n", this, mResourceTableAsset); 1913 return mResourceTableAsset; 1914} 1915 1916Asset* AssetManager::SharedZip::setResourceTableAsset(Asset* asset) 1917{ 1918 { 1919 AutoMutex _l(gLock); 1920 if (mResourceTableAsset == NULL) { 1921 mResourceTableAsset = asset; 1922 // This is not thread safe the first time it is called, so 1923 // do it here with the global lock held. 1924 asset->getBuffer(true); 1925 return asset; 1926 } 1927 } 1928 delete asset; 1929 return mResourceTableAsset; 1930} 1931 1932ResTable* AssetManager::SharedZip::getResourceTable() 1933{ 1934 ALOGV("Getting from SharedZip %p resource table %p\n", this, mResourceTable); 1935 return mResourceTable; 1936} 1937 1938ResTable* AssetManager::SharedZip::setResourceTable(ResTable* res) 1939{ 1940 { 1941 AutoMutex _l(gLock); 1942 if (mResourceTable == NULL) { 1943 mResourceTable = res; 1944 return res; 1945 } 1946 } 1947 delete res; 1948 return mResourceTable; 1949} 1950 1951bool AssetManager::SharedZip::isUpToDate() 1952{ 1953 time_t modWhen = getFileModDate(mPath.string()); 1954 return mModWhen == modWhen; 1955} 1956 1957void AssetManager::SharedZip::addOverlay(const asset_path& ap) 1958{ 1959 mOverlays.add(ap); 1960} 1961 1962bool AssetManager::SharedZip::getOverlay(size_t idx, asset_path* out) const 1963{ 1964 if (idx >= mOverlays.size()) { 1965 return false; 1966 } 1967 *out = mOverlays[idx]; 1968 return true; 1969} 1970 1971AssetManager::SharedZip::~SharedZip() 1972{ 1973 if (kIsDebug) { 1974 ALOGI("Destroying SharedZip %p %s\n", this, (const char*)mPath); 1975 } 1976 if (mResourceTable != NULL) { 1977 delete mResourceTable; 1978 } 1979 if (mResourceTableAsset != NULL) { 1980 delete mResourceTableAsset; 1981 } 1982 if (mZipFile != NULL) { 1983 delete mZipFile; 1984 ALOGV("Closed '%s'\n", mPath.string()); 1985 } 1986} 1987 1988/* 1989 * =========================================================================== 1990 * AssetManager::ZipSet 1991 * =========================================================================== 1992 */ 1993 1994/* 1995 * Constructor. 1996 */ 1997AssetManager::ZipSet::ZipSet(void) 1998{ 1999} 2000 2001/* 2002 * Destructor. Close any open archives. 2003 */ 2004AssetManager::ZipSet::~ZipSet(void) 2005{ 2006 size_t N = mZipFile.size(); 2007 for (size_t i = 0; i < N; i++) 2008 closeZip(i); 2009} 2010 2011/* 2012 * Close a Zip file and reset the entry. 2013 */ 2014void AssetManager::ZipSet::closeZip(int idx) 2015{ 2016 mZipFile.editItemAt(idx) = NULL; 2017} 2018 2019 2020/* 2021 * Retrieve the appropriate Zip file from the set. 2022 */ 2023ZipFileRO* AssetManager::ZipSet::getZip(const String8& path) 2024{ 2025 int idx = getIndex(path); 2026 sp<SharedZip> zip = mZipFile[idx]; 2027 if (zip == NULL) { 2028 zip = SharedZip::get(path); 2029 mZipFile.editItemAt(idx) = zip; 2030 } 2031 return zip->getZip(); 2032} 2033 2034Asset* AssetManager::ZipSet::getZipResourceTableAsset(const String8& path) 2035{ 2036 int idx = getIndex(path); 2037 sp<SharedZip> zip = mZipFile[idx]; 2038 if (zip == NULL) { 2039 zip = SharedZip::get(path); 2040 mZipFile.editItemAt(idx) = zip; 2041 } 2042 return zip->getResourceTableAsset(); 2043} 2044 2045Asset* AssetManager::ZipSet::setZipResourceTableAsset(const String8& path, 2046 Asset* asset) 2047{ 2048 int idx = getIndex(path); 2049 sp<SharedZip> zip = mZipFile[idx]; 2050 // doesn't make sense to call before previously accessing. 2051 return zip->setResourceTableAsset(asset); 2052} 2053 2054ResTable* AssetManager::ZipSet::getZipResourceTable(const String8& path) 2055{ 2056 int idx = getIndex(path); 2057 sp<SharedZip> zip = mZipFile[idx]; 2058 if (zip == NULL) { 2059 zip = SharedZip::get(path); 2060 mZipFile.editItemAt(idx) = zip; 2061 } 2062 return zip->getResourceTable(); 2063} 2064 2065ResTable* AssetManager::ZipSet::setZipResourceTable(const String8& path, 2066 ResTable* res) 2067{ 2068 int idx = getIndex(path); 2069 sp<SharedZip> zip = mZipFile[idx]; 2070 // doesn't make sense to call before previously accessing. 2071 return zip->setResourceTable(res); 2072} 2073 2074/* 2075 * Generate the partial pathname for the specified archive. The caller 2076 * gets to prepend the asset root directory. 2077 * 2078 * Returns something like "common/en-US-noogle.jar". 2079 */ 2080/*static*/ String8 AssetManager::ZipSet::getPathName(const char* zipPath) 2081{ 2082 return String8(zipPath); 2083} 2084 2085bool AssetManager::ZipSet::isUpToDate() 2086{ 2087 const size_t N = mZipFile.size(); 2088 for (size_t i=0; i<N; i++) { 2089 if (mZipFile[i] != NULL && !mZipFile[i]->isUpToDate()) { 2090 return false; 2091 } 2092 } 2093 return true; 2094} 2095 2096void AssetManager::ZipSet::addOverlay(const String8& path, const asset_path& overlay) 2097{ 2098 int idx = getIndex(path); 2099 sp<SharedZip> zip = mZipFile[idx]; 2100 zip->addOverlay(overlay); 2101} 2102 2103bool AssetManager::ZipSet::getOverlay(const String8& path, size_t idx, asset_path* out) const 2104{ 2105 sp<SharedZip> zip = SharedZip::get(path, false); 2106 if (zip == NULL) { 2107 return false; 2108 } 2109 return zip->getOverlay(idx, out); 2110} 2111 2112/* 2113 * Compute the zip file's index. 2114 * 2115 * "appName", "locale", and "vendor" should be set to NULL to indicate the 2116 * default directory. 2117 */ 2118int AssetManager::ZipSet::getIndex(const String8& zip) const 2119{ 2120 const size_t N = mZipPath.size(); 2121 for (size_t i=0; i<N; i++) { 2122 if (mZipPath[i] == zip) { 2123 return i; 2124 } 2125 } 2126 2127 mZipPath.add(zip); 2128 mZipFile.add(NULL); 2129 2130 return mZipPath.size()-1; 2131} 2132