AssetManager.cpp revision ba3fe56edc1da4dad0d831a1892e7b1c3c20c437
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 __ANDROID__ 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 __ANDROID__ 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 __ANDROID__ 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 // skip those ap's that correspond to system overlays 615 if (ap.isSystemOverlay) { 616 return true; 617 } 618 619 Asset* ass = NULL; 620 ResTable* sharedRes = NULL; 621 bool shared = true; 622 bool onlyEmptyResources = true; 623 MY_TRACE_BEGIN(ap.path.string()); 624 Asset* idmap = openIdmapLocked(ap); 625 size_t nextEntryIdx = mResources->getTableCount(); 626 ALOGV("Looking for resource asset in '%s'\n", ap.path.string()); 627 if (ap.type != kFileTypeDirectory) { 628 if (nextEntryIdx == 0) { 629 // The first item is typically the framework resources, 630 // which we want to avoid parsing every time. 631 sharedRes = const_cast<AssetManager*>(this)-> 632 mZipSet.getZipResourceTable(ap.path); 633 if (sharedRes != NULL) { 634 // skip ahead the number of system overlay packages preloaded 635 nextEntryIdx = sharedRes->getTableCount(); 636 } 637 } 638 if (sharedRes == NULL) { 639 ass = const_cast<AssetManager*>(this)-> 640 mZipSet.getZipResourceTableAsset(ap.path); 641 if (ass == NULL) { 642 ALOGV("loading resource table %s\n", ap.path.string()); 643 ass = const_cast<AssetManager*>(this)-> 644 openNonAssetInPathLocked("resources.arsc", 645 Asset::ACCESS_BUFFER, 646 ap); 647 if (ass != NULL && ass != kExcludedAsset) { 648 ass = const_cast<AssetManager*>(this)-> 649 mZipSet.setZipResourceTableAsset(ap.path, ass); 650 } 651 } 652 653 if (nextEntryIdx == 0 && ass != NULL) { 654 // If this is the first resource table in the asset 655 // manager, then we are going to cache it so that we 656 // can quickly copy it out for others. 657 ALOGV("Creating shared resources for %s", ap.path.string()); 658 sharedRes = new ResTable(); 659 sharedRes->add(ass, idmap, nextEntryIdx + 1, false); 660#ifdef __ANDROID__ 661 const char* data = getenv("ANDROID_DATA"); 662 LOG_ALWAYS_FATAL_IF(data == NULL, "ANDROID_DATA not set"); 663 String8 overlaysListPath(data); 664 overlaysListPath.appendPath(kResourceCache); 665 overlaysListPath.appendPath("overlays.list"); 666 addSystemOverlays(overlaysListPath.string(), ap.path, sharedRes, nextEntryIdx); 667#endif 668 sharedRes = const_cast<AssetManager*>(this)-> 669 mZipSet.setZipResourceTable(ap.path, sharedRes); 670 } 671 } 672 } else { 673 ALOGV("loading resource table %s\n", ap.path.string()); 674 ass = const_cast<AssetManager*>(this)-> 675 openNonAssetInPathLocked("resources.arsc", 676 Asset::ACCESS_BUFFER, 677 ap); 678 shared = false; 679 } 680 681 if ((ass != NULL || sharedRes != NULL) && ass != kExcludedAsset) { 682 ALOGV("Installing resource asset %p in to table %p\n", ass, mResources); 683 if (sharedRes != NULL) { 684 ALOGV("Copying existing resources for %s", ap.path.string()); 685 mResources->add(sharedRes); 686 } else { 687 ALOGV("Parsing resources for %s", ap.path.string()); 688 mResources->add(ass, idmap, nextEntryIdx + 1, !shared); 689 } 690 onlyEmptyResources = false; 691 692 if (!shared) { 693 delete ass; 694 } 695 } else { 696 ALOGV("Installing empty resources in to table %p\n", mResources); 697 mResources->addEmpty(nextEntryIdx + 1); 698 } 699 700 if (idmap != NULL) { 701 delete idmap; 702 } 703 MY_TRACE_END(); 704 705 return onlyEmptyResources; 706} 707 708const ResTable* AssetManager::getResTable(bool required) const 709{ 710 ResTable* rt = mResources; 711 if (rt) { 712 return rt; 713 } 714 715 // Iterate through all asset packages, collecting resources from each. 716 717 AutoMutex _l(mLock); 718 719 if (mResources != NULL) { 720 return mResources; 721 } 722 723 if (required) { 724 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 725 } 726 727 if (mCacheMode != CACHE_OFF && !mCacheValid) { 728 const_cast<AssetManager*>(this)->loadFileNameCacheLocked(); 729 } 730 731 mResources = new ResTable(); 732 updateResourceParamsLocked(); 733 734 bool onlyEmptyResources = true; 735 const size_t N = mAssetPaths.size(); 736 for (size_t i=0; i<N; i++) { 737 bool empty = appendPathToResTable(mAssetPaths.itemAt(i)); 738 onlyEmptyResources = onlyEmptyResources && empty; 739 } 740 741 if (required && onlyEmptyResources) { 742 ALOGW("Unable to find resources file resources.arsc"); 743 delete mResources; 744 mResources = NULL; 745 } 746 747 return mResources; 748} 749 750void AssetManager::updateResourceParamsLocked() const 751{ 752 ResTable* res = mResources; 753 if (!res) { 754 return; 755 } 756 757 if (mLocale) { 758 mConfig->setBcp47Locale(mLocale); 759 } else { 760 mConfig->clearLocale(); 761 } 762 763 res->setParameters(mConfig); 764} 765 766Asset* AssetManager::openIdmapLocked(const struct asset_path& ap) const 767{ 768 Asset* ass = NULL; 769 if (ap.idmap.size() != 0) { 770 ass = const_cast<AssetManager*>(this)-> 771 openAssetFromFileLocked(ap.idmap, Asset::ACCESS_BUFFER); 772 if (ass) { 773 ALOGV("loading idmap %s\n", ap.idmap.string()); 774 } else { 775 ALOGW("failed to load idmap %s\n", ap.idmap.string()); 776 } 777 } 778 return ass; 779} 780 781void AssetManager::addSystemOverlays(const char* pathOverlaysList, 782 const String8& targetPackagePath, ResTable* sharedRes, size_t offset) const 783{ 784 FILE* fin = fopen(pathOverlaysList, "r"); 785 if (fin == NULL) { 786 return; 787 } 788 789 char buf[1024]; 790 while (fgets(buf, sizeof(buf), fin)) { 791 // format of each line: 792 // <path to apk><space><path to idmap><newline> 793 char* space = strchr(buf, ' '); 794 char* newline = strchr(buf, '\n'); 795 asset_path oap; 796 797 if (space == NULL || newline == NULL || newline < space) { 798 continue; 799 } 800 801 oap.path = String8(buf, space - buf); 802 oap.type = kFileTypeRegular; 803 oap.idmap = String8(space + 1, newline - space - 1); 804 oap.isSystemOverlay = true; 805 806 Asset* oass = const_cast<AssetManager*>(this)-> 807 openNonAssetInPathLocked("resources.arsc", 808 Asset::ACCESS_BUFFER, 809 oap); 810 811 if (oass != NULL) { 812 Asset* oidmap = openIdmapLocked(oap); 813 offset++; 814 sharedRes->add(oass, oidmap, offset + 1, false); 815 const_cast<AssetManager*>(this)->mAssetPaths.add(oap); 816 const_cast<AssetManager*>(this)->mZipSet.addOverlay(targetPackagePath, oap); 817 } 818 } 819 fclose(fin); 820} 821 822const ResTable& AssetManager::getResources(bool required) const 823{ 824 const ResTable* rt = getResTable(required); 825 return *rt; 826} 827 828bool AssetManager::isUpToDate() 829{ 830 AutoMutex _l(mLock); 831 return mZipSet.isUpToDate(); 832} 833 834void AssetManager::getLocales(Vector<String8>* locales) const 835{ 836 ResTable* res = mResources; 837 if (res != NULL) { 838 res->getLocales(locales); 839 } 840 841 const size_t numLocales = locales->size(); 842 for (size_t i = 0; i < numLocales; ++i) { 843 const String8& localeStr = locales->itemAt(i); 844 if (localeStr.find(kTlPrefix) == 0) { 845 String8 replaced("fil"); 846 replaced += (localeStr.string() + kTlPrefixLen); 847 locales->editItemAt(i) = replaced; 848 } 849 } 850} 851 852/* 853 * Open a non-asset file as if it were an asset, searching for it in the 854 * specified app. 855 * 856 * Pass in a NULL values for "appName" if the common app directory should 857 * be used. 858 */ 859Asset* AssetManager::openNonAssetInPathLocked(const char* fileName, AccessMode mode, 860 const asset_path& ap) 861{ 862 Asset* pAsset = NULL; 863 864 /* look at the filesystem on disk */ 865 if (ap.type == kFileTypeDirectory) { 866 String8 path(ap.path); 867 path.appendPath(fileName); 868 869 pAsset = openAssetFromFileLocked(path, mode); 870 871 if (pAsset == NULL) { 872 /* try again, this time with ".gz" */ 873 path.append(".gz"); 874 pAsset = openAssetFromFileLocked(path, mode); 875 } 876 877 if (pAsset != NULL) { 878 //printf("FOUND NA '%s' on disk\n", fileName); 879 pAsset->setAssetSource(path); 880 } 881 882 /* look inside the zip file */ 883 } else { 884 String8 path(fileName); 885 886 /* check the appropriate Zip file */ 887 ZipFileRO* pZip = getZipFileLocked(ap); 888 if (pZip != NULL) { 889 //printf("GOT zip, checking NA '%s'\n", (const char*) path); 890 ZipEntryRO entry = pZip->findEntryByName(path.string()); 891 if (entry != NULL) { 892 //printf("FOUND NA in Zip file for %s\n", appName ? appName : kAppCommon); 893 pAsset = openAssetFromZipLocked(pZip, entry, mode, path); 894 pZip->releaseEntry(entry); 895 } 896 } 897 898 if (pAsset != NULL) { 899 /* create a "source" name, for debug/display */ 900 pAsset->setAssetSource( 901 createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()), String8(""), 902 String8(fileName))); 903 } 904 } 905 906 return pAsset; 907} 908 909/* 910 * Open an asset, searching for it in the directory hierarchy for the 911 * specified app. 912 * 913 * Pass in a NULL values for "appName" if the common app directory should 914 * be used. 915 */ 916Asset* AssetManager::openInPathLocked(const char* fileName, AccessMode mode, 917 const asset_path& ap) 918{ 919 Asset* pAsset = NULL; 920 921 /* 922 * Try various combinations of locale and vendor. 923 */ 924 if (mLocale != NULL && mVendor != NULL) 925 pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, mVendor); 926 if (pAsset == NULL && mVendor != NULL) 927 pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, mVendor); 928 if (pAsset == NULL && mLocale != NULL) 929 pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, NULL); 930 if (pAsset == NULL) 931 pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, NULL); 932 933 return pAsset; 934} 935 936/* 937 * Open an asset, searching for it in the directory hierarchy for the 938 * specified locale and vendor. 939 * 940 * We also search in "app.jar". 941 * 942 * Pass in NULL values for "appName", "locale", and "vendor" if the 943 * defaults should be used. 944 */ 945Asset* AssetManager::openInLocaleVendorLocked(const char* fileName, AccessMode mode, 946 const asset_path& ap, const char* locale, const char* vendor) 947{ 948 Asset* pAsset = NULL; 949 950 if (ap.type == kFileTypeDirectory) { 951 if (mCacheMode == CACHE_OFF) { 952 /* look at the filesystem on disk */ 953 String8 path(createPathNameLocked(ap, locale, vendor)); 954 path.appendPath(fileName); 955 956 String8 excludeName(path); 957 excludeName.append(kExcludeExtension); 958 if (::getFileType(excludeName.string()) != kFileTypeNonexistent) { 959 /* say no more */ 960 //printf("+++ excluding '%s'\n", (const char*) excludeName); 961 return kExcludedAsset; 962 } 963 964 pAsset = openAssetFromFileLocked(path, mode); 965 966 if (pAsset == NULL) { 967 /* try again, this time with ".gz" */ 968 path.append(".gz"); 969 pAsset = openAssetFromFileLocked(path, mode); 970 } 971 972 if (pAsset != NULL) 973 pAsset->setAssetSource(path); 974 } else { 975 /* find in cache */ 976 String8 path(createPathNameLocked(ap, locale, vendor)); 977 path.appendPath(fileName); 978 979 AssetDir::FileInfo tmpInfo; 980 bool found = false; 981 982 String8 excludeName(path); 983 excludeName.append(kExcludeExtension); 984 985 if (mCache.indexOf(excludeName) != NAME_NOT_FOUND) { 986 /* go no farther */ 987 //printf("+++ Excluding '%s'\n", (const char*) excludeName); 988 return kExcludedAsset; 989 } 990 991 /* 992 * File compression extensions (".gz") don't get stored in the 993 * name cache, so we have to try both here. 994 */ 995 if (mCache.indexOf(path) != NAME_NOT_FOUND) { 996 found = true; 997 pAsset = openAssetFromFileLocked(path, mode); 998 if (pAsset == NULL) { 999 /* try again, this time with ".gz" */ 1000 path.append(".gz"); 1001 pAsset = openAssetFromFileLocked(path, mode); 1002 } 1003 } 1004 1005 if (pAsset != NULL) 1006 pAsset->setAssetSource(path); 1007 1008 /* 1009 * Don't continue the search into the Zip files. Our cached info 1010 * said it was a file on disk; to be consistent with openDir() 1011 * we want to return the loose asset. If the cached file gets 1012 * removed, we fail. 1013 * 1014 * The alternative is to update our cache when files get deleted, 1015 * or make some sort of "best effort" promise, but for now I'm 1016 * taking the hard line. 1017 */ 1018 if (found) { 1019 if (pAsset == NULL) 1020 ALOGD("Expected file not found: '%s'\n", path.string()); 1021 return pAsset; 1022 } 1023 } 1024 } 1025 1026 /* 1027 * Either it wasn't found on disk or on the cached view of the disk. 1028 * Dig through the currently-opened set of Zip files. If caching 1029 * is disabled, the Zip file may get reopened. 1030 */ 1031 if (pAsset == NULL && ap.type == kFileTypeRegular) { 1032 String8 path; 1033 1034 path.appendPath((locale != NULL) ? locale : kDefaultLocale); 1035 path.appendPath((vendor != NULL) ? vendor : kDefaultVendor); 1036 path.appendPath(fileName); 1037 1038 /* check the appropriate Zip file */ 1039 ZipFileRO* pZip = getZipFileLocked(ap); 1040 if (pZip != NULL) { 1041 //printf("GOT zip, checking '%s'\n", (const char*) path); 1042 ZipEntryRO entry = pZip->findEntryByName(path.string()); 1043 if (entry != NULL) { 1044 //printf("FOUND in Zip file for %s/%s-%s\n", 1045 // appName, locale, vendor); 1046 pAsset = openAssetFromZipLocked(pZip, entry, mode, path); 1047 pZip->releaseEntry(entry); 1048 } 1049 } 1050 1051 if (pAsset != NULL) { 1052 /* create a "source" name, for debug/display */ 1053 pAsset->setAssetSource(createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()), 1054 String8(""), String8(fileName))); 1055 } 1056 } 1057 1058 return pAsset; 1059} 1060 1061/* 1062 * Create a "source name" for a file from a Zip archive. 1063 */ 1064String8 AssetManager::createZipSourceNameLocked(const String8& zipFileName, 1065 const String8& dirName, const String8& fileName) 1066{ 1067 String8 sourceName("zip:"); 1068 sourceName.append(zipFileName); 1069 sourceName.append(":"); 1070 if (dirName.length() > 0) { 1071 sourceName.appendPath(dirName); 1072 } 1073 sourceName.appendPath(fileName); 1074 return sourceName; 1075} 1076 1077/* 1078 * Create a path to a loose asset (asset-base/app/locale/vendor). 1079 */ 1080String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* locale, 1081 const char* vendor) 1082{ 1083 String8 path(ap.path); 1084 path.appendPath((locale != NULL) ? locale : kDefaultLocale); 1085 path.appendPath((vendor != NULL) ? vendor : kDefaultVendor); 1086 return path; 1087} 1088 1089/* 1090 * Create a path to a loose asset (asset-base/app/rootDir). 1091 */ 1092String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* rootDir) 1093{ 1094 String8 path(ap.path); 1095 if (rootDir != NULL) path.appendPath(rootDir); 1096 return path; 1097} 1098 1099/* 1100 * Return a pointer to one of our open Zip archives. Returns NULL if no 1101 * matching Zip file exists. 1102 * 1103 * Right now we have 2 possible Zip files (1 each in app/"common"). 1104 * 1105 * If caching is set to CACHE_OFF, to get the expected behavior we 1106 * need to reopen the Zip file on every request. That would be silly 1107 * and expensive, so instead we just check the file modification date. 1108 * 1109 * Pass in NULL values for "appName", "locale", and "vendor" if the 1110 * generics should be used. 1111 */ 1112ZipFileRO* AssetManager::getZipFileLocked(const asset_path& ap) 1113{ 1114 ALOGV("getZipFileLocked() in %p\n", this); 1115 1116 return mZipSet.getZip(ap.path); 1117} 1118 1119/* 1120 * Try to open an asset from a file on disk. 1121 * 1122 * If the file is compressed with gzip, we seek to the start of the 1123 * deflated data and pass that in (just like we would for a Zip archive). 1124 * 1125 * For uncompressed data, we may already have an mmap()ed version sitting 1126 * around. If so, we want to hand that to the Asset instead. 1127 * 1128 * This returns NULL if the file doesn't exist, couldn't be opened, or 1129 * claims to be a ".gz" but isn't. 1130 */ 1131Asset* AssetManager::openAssetFromFileLocked(const String8& pathName, 1132 AccessMode mode) 1133{ 1134 Asset* pAsset = NULL; 1135 1136 if (strcasecmp(pathName.getPathExtension().string(), ".gz") == 0) { 1137 //printf("TRYING '%s'\n", (const char*) pathName); 1138 pAsset = Asset::createFromCompressedFile(pathName.string(), mode); 1139 } else { 1140 //printf("TRYING '%s'\n", (const char*) pathName); 1141 pAsset = Asset::createFromFile(pathName.string(), mode); 1142 } 1143 1144 return pAsset; 1145} 1146 1147/* 1148 * Given an entry in a Zip archive, create a new Asset object. 1149 * 1150 * If the entry is uncompressed, we may want to create or share a 1151 * slice of shared memory. 1152 */ 1153Asset* AssetManager::openAssetFromZipLocked(const ZipFileRO* pZipFile, 1154 const ZipEntryRO entry, AccessMode mode, const String8& entryName) 1155{ 1156 Asset* pAsset = NULL; 1157 1158 // TODO: look for previously-created shared memory slice? 1159 uint16_t method; 1160 uint32_t uncompressedLen; 1161 1162 //printf("USING Zip '%s'\n", pEntry->getFileName()); 1163 1164 if (!pZipFile->getEntryInfo(entry, &method, &uncompressedLen, NULL, NULL, 1165 NULL, NULL)) 1166 { 1167 ALOGW("getEntryInfo failed\n"); 1168 return NULL; 1169 } 1170 1171 FileMap* dataMap = pZipFile->createEntryFileMap(entry); 1172 if (dataMap == NULL) { 1173 ALOGW("create map from entry failed\n"); 1174 return NULL; 1175 } 1176 1177 if (method == ZipFileRO::kCompressStored) { 1178 pAsset = Asset::createFromUncompressedMap(dataMap, mode); 1179 ALOGV("Opened uncompressed entry %s in zip %s mode %d: %p", entryName.string(), 1180 dataMap->getFileName(), mode, pAsset); 1181 } else { 1182 pAsset = Asset::createFromCompressedMap(dataMap, 1183 static_cast<size_t>(uncompressedLen), mode); 1184 ALOGV("Opened compressed entry %s in zip %s mode %d: %p", entryName.string(), 1185 dataMap->getFileName(), mode, pAsset); 1186 } 1187 if (pAsset == NULL) { 1188 /* unexpected */ 1189 ALOGW("create from segment failed\n"); 1190 } 1191 1192 return pAsset; 1193} 1194 1195 1196 1197/* 1198 * Open a directory in the asset namespace. 1199 * 1200 * An "asset directory" is simply the combination of all files in all 1201 * locations, with ".gz" stripped for loose files. With app, locale, and 1202 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1203 * 1204 * Pass in "" for the root dir. 1205 */ 1206AssetDir* AssetManager::openDir(const char* dirName) 1207{ 1208 AutoMutex _l(mLock); 1209 1210 AssetDir* pDir = NULL; 1211 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1212 1213 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1214 assert(dirName != NULL); 1215 1216 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1217 1218 if (mCacheMode != CACHE_OFF && !mCacheValid) 1219 loadFileNameCacheLocked(); 1220 1221 pDir = new AssetDir; 1222 1223 /* 1224 * Scan the various directories, merging what we find into a single 1225 * vector. We want to scan them in reverse priority order so that 1226 * the ".EXCLUDE" processing works correctly. Also, if we decide we 1227 * want to remember where the file is coming from, we'll get the right 1228 * version. 1229 * 1230 * We start with Zip archives, then do loose files. 1231 */ 1232 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1233 1234 size_t i = mAssetPaths.size(); 1235 while (i > 0) { 1236 i--; 1237 const asset_path& ap = mAssetPaths.itemAt(i); 1238 if (ap.type == kFileTypeRegular) { 1239 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1240 scanAndMergeZipLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1241 } else { 1242 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1243 scanAndMergeDirLocked(pMergedInfo, ap, kAssetsRoot, dirName); 1244 } 1245 } 1246 1247#if 0 1248 printf("FILE LIST:\n"); 1249 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1250 printf(" %d: (%d) '%s'\n", i, 1251 pMergedInfo->itemAt(i).getFileType(), 1252 (const char*) pMergedInfo->itemAt(i).getFileName()); 1253 } 1254#endif 1255 1256 pDir->setFileList(pMergedInfo); 1257 return pDir; 1258} 1259 1260/* 1261 * Open a directory in the non-asset namespace. 1262 * 1263 * An "asset directory" is simply the combination of all files in all 1264 * locations, with ".gz" stripped for loose files. With app, locale, and 1265 * vendor defined, we have 8 directories and 2 Zip archives to scan. 1266 * 1267 * Pass in "" for the root dir. 1268 */ 1269AssetDir* AssetManager::openNonAssetDir(const int32_t cookie, const char* dirName) 1270{ 1271 AutoMutex _l(mLock); 1272 1273 AssetDir* pDir = NULL; 1274 SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL; 1275 1276 LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager"); 1277 assert(dirName != NULL); 1278 1279 //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase); 1280 1281 if (mCacheMode != CACHE_OFF && !mCacheValid) 1282 loadFileNameCacheLocked(); 1283 1284 pDir = new AssetDir; 1285 1286 pMergedInfo = new SortedVector<AssetDir::FileInfo>; 1287 1288 const size_t which = static_cast<size_t>(cookie) - 1; 1289 1290 if (which < mAssetPaths.size()) { 1291 const asset_path& ap = mAssetPaths.itemAt(which); 1292 if (ap.type == kFileTypeRegular) { 1293 ALOGV("Adding directory %s from zip %s", dirName, ap.path.string()); 1294 scanAndMergeZipLocked(pMergedInfo, ap, NULL, dirName); 1295 } else { 1296 ALOGV("Adding directory %s from dir %s", dirName, ap.path.string()); 1297 scanAndMergeDirLocked(pMergedInfo, ap, NULL, dirName); 1298 } 1299 } 1300 1301#if 0 1302 printf("FILE LIST:\n"); 1303 for (i = 0; i < (size_t) pMergedInfo->size(); i++) { 1304 printf(" %d: (%d) '%s'\n", i, 1305 pMergedInfo->itemAt(i).getFileType(), 1306 (const char*) pMergedInfo->itemAt(i).getFileName()); 1307 } 1308#endif 1309 1310 pDir->setFileList(pMergedInfo); 1311 return pDir; 1312} 1313 1314/* 1315 * Scan the contents of the specified directory and merge them into the 1316 * "pMergedInfo" vector, removing previous entries if we find "exclude" 1317 * directives. 1318 * 1319 * Returns "false" if we found nothing to contribute. 1320 */ 1321bool AssetManager::scanAndMergeDirLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1322 const asset_path& ap, const char* rootDir, const char* dirName) 1323{ 1324 SortedVector<AssetDir::FileInfo>* pContents; 1325 String8 path; 1326 1327 assert(pMergedInfo != NULL); 1328 1329 //printf("scanAndMergeDir: %s %s %s %s\n", appName, locale, vendor,dirName); 1330 1331 if (mCacheValid) { 1332 int i, start, count; 1333 1334 pContents = new SortedVector<AssetDir::FileInfo>; 1335 1336 /* 1337 * Get the basic partial path and find it in the cache. That's 1338 * the start point for the search. 1339 */ 1340 path = createPathNameLocked(ap, rootDir); 1341 if (dirName[0] != '\0') 1342 path.appendPath(dirName); 1343 1344 start = mCache.indexOf(path); 1345 if (start == NAME_NOT_FOUND) { 1346 //printf("+++ not found in cache: dir '%s'\n", (const char*) path); 1347 delete pContents; 1348 return false; 1349 } 1350 1351 /* 1352 * The match string looks like "common/default/default/foo/bar/". 1353 * The '/' on the end ensures that we don't match on the directory 1354 * itself or on ".../foo/barfy/". 1355 */ 1356 path.append("/"); 1357 1358 count = mCache.size(); 1359 1360 /* 1361 * Pick out the stuff in the current dir by examining the pathname. 1362 * It needs to match the partial pathname prefix, and not have a '/' 1363 * (fssep) anywhere after the prefix. 1364 */ 1365 for (i = start+1; i < count; i++) { 1366 if (mCache[i].getFileName().length() > path.length() && 1367 strncmp(mCache[i].getFileName().string(), path.string(), path.length()) == 0) 1368 { 1369 const char* name = mCache[i].getFileName().string(); 1370 // XXX THIS IS BROKEN! Looks like we need to store the full 1371 // path prefix separately from the file path. 1372 if (strchr(name + path.length(), '/') == NULL) { 1373 /* grab it, reducing path to just the filename component */ 1374 AssetDir::FileInfo tmp = mCache[i]; 1375 tmp.setFileName(tmp.getFileName().getPathLeaf()); 1376 pContents->add(tmp); 1377 } 1378 } else { 1379 /* no longer in the dir or its subdirs */ 1380 break; 1381 } 1382 1383 } 1384 } else { 1385 path = createPathNameLocked(ap, rootDir); 1386 if (dirName[0] != '\0') 1387 path.appendPath(dirName); 1388 pContents = scanDirLocked(path); 1389 if (pContents == NULL) 1390 return false; 1391 } 1392 1393 // if we wanted to do an incremental cache fill, we would do it here 1394 1395 /* 1396 * Process "exclude" directives. If we find a filename that ends with 1397 * ".EXCLUDE", we look for a matching entry in the "merged" set, and 1398 * remove it if we find it. We also delete the "exclude" entry. 1399 */ 1400 int i, count, exclExtLen; 1401 1402 count = pContents->size(); 1403 exclExtLen = strlen(kExcludeExtension); 1404 for (i = 0; i < count; i++) { 1405 const char* name; 1406 int nameLen; 1407 1408 name = pContents->itemAt(i).getFileName().string(); 1409 nameLen = strlen(name); 1410 if (nameLen > exclExtLen && 1411 strcmp(name + (nameLen - exclExtLen), kExcludeExtension) == 0) 1412 { 1413 String8 match(name, nameLen - exclExtLen); 1414 int matchIdx; 1415 1416 matchIdx = AssetDir::FileInfo::findEntry(pMergedInfo, match); 1417 if (matchIdx > 0) { 1418 ALOGV("Excluding '%s' [%s]\n", 1419 pMergedInfo->itemAt(matchIdx).getFileName().string(), 1420 pMergedInfo->itemAt(matchIdx).getSourceName().string()); 1421 pMergedInfo->removeAt(matchIdx); 1422 } else { 1423 //printf("+++ no match on '%s'\n", (const char*) match); 1424 } 1425 1426 ALOGD("HEY: size=%d removing %d\n", (int)pContents->size(), i); 1427 pContents->removeAt(i); 1428 i--; // adjust "for" loop 1429 count--; // and loop limit 1430 } 1431 } 1432 1433 mergeInfoLocked(pMergedInfo, pContents); 1434 1435 delete pContents; 1436 1437 return true; 1438} 1439 1440/* 1441 * Scan the contents of the specified directory, and stuff what we find 1442 * into a newly-allocated vector. 1443 * 1444 * Files ending in ".gz" will have their extensions removed. 1445 * 1446 * We should probably think about skipping files with "illegal" names, 1447 * e.g. illegal characters (/\:) or excessive length. 1448 * 1449 * Returns NULL if the specified directory doesn't exist. 1450 */ 1451SortedVector<AssetDir::FileInfo>* AssetManager::scanDirLocked(const String8& path) 1452{ 1453 SortedVector<AssetDir::FileInfo>* pContents = NULL; 1454 DIR* dir; 1455 struct dirent* entry; 1456 FileType fileType; 1457 1458 ALOGV("Scanning dir '%s'\n", path.string()); 1459 1460 dir = opendir(path.string()); 1461 if (dir == NULL) 1462 return NULL; 1463 1464 pContents = new SortedVector<AssetDir::FileInfo>; 1465 1466 while (1) { 1467 entry = readdir(dir); 1468 if (entry == NULL) 1469 break; 1470 1471 if (strcmp(entry->d_name, ".") == 0 || 1472 strcmp(entry->d_name, "..") == 0) 1473 continue; 1474 1475#ifdef _DIRENT_HAVE_D_TYPE 1476 if (entry->d_type == DT_REG) 1477 fileType = kFileTypeRegular; 1478 else if (entry->d_type == DT_DIR) 1479 fileType = kFileTypeDirectory; 1480 else 1481 fileType = kFileTypeUnknown; 1482#else 1483 // stat the file 1484 fileType = ::getFileType(path.appendPathCopy(entry->d_name).string()); 1485#endif 1486 1487 if (fileType != kFileTypeRegular && fileType != kFileTypeDirectory) 1488 continue; 1489 1490 AssetDir::FileInfo info; 1491 info.set(String8(entry->d_name), fileType); 1492 if (strcasecmp(info.getFileName().getPathExtension().string(), ".gz") == 0) 1493 info.setFileName(info.getFileName().getBasePath()); 1494 info.setSourceName(path.appendPathCopy(info.getFileName())); 1495 pContents->add(info); 1496 } 1497 1498 closedir(dir); 1499 return pContents; 1500} 1501 1502/* 1503 * Scan the contents out of the specified Zip archive, and merge what we 1504 * find into "pMergedInfo". If the Zip archive in question doesn't exist, 1505 * we return immediately. 1506 * 1507 * Returns "false" if we found nothing to contribute. 1508 */ 1509bool AssetManager::scanAndMergeZipLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1510 const asset_path& ap, const char* rootDir, const char* baseDirName) 1511{ 1512 ZipFileRO* pZip; 1513 Vector<String8> dirs; 1514 AssetDir::FileInfo info; 1515 SortedVector<AssetDir::FileInfo> contents; 1516 String8 sourceName, zipName, dirName; 1517 1518 pZip = mZipSet.getZip(ap.path); 1519 if (pZip == NULL) { 1520 ALOGW("Failure opening zip %s\n", ap.path.string()); 1521 return false; 1522 } 1523 1524 zipName = ZipSet::getPathName(ap.path.string()); 1525 1526 /* convert "sounds" to "rootDir/sounds" */ 1527 if (rootDir != NULL) dirName = rootDir; 1528 dirName.appendPath(baseDirName); 1529 1530 /* 1531 * Scan through the list of files, looking for a match. The files in 1532 * the Zip table of contents are not in sorted order, so we have to 1533 * process the entire list. We're looking for a string that begins 1534 * with the characters in "dirName", is followed by a '/', and has no 1535 * subsequent '/' in the stuff that follows. 1536 * 1537 * What makes this especially fun is that directories are not stored 1538 * explicitly in Zip archives, so we have to infer them from context. 1539 * When we see "sounds/foo.wav" we have to leave a note to ourselves 1540 * to insert a directory called "sounds" into the list. We store 1541 * these in temporary vector so that we only return each one once. 1542 * 1543 * Name comparisons are case-sensitive to match UNIX filesystem 1544 * semantics. 1545 */ 1546 int dirNameLen = dirName.length(); 1547 void *iterationCookie; 1548 if (!pZip->startIteration(&iterationCookie, dirName.string(), NULL)) { 1549 ALOGW("ZipFileRO::startIteration returned false"); 1550 return false; 1551 } 1552 1553 ZipEntryRO entry; 1554 while ((entry = pZip->nextEntry(iterationCookie)) != NULL) { 1555 char nameBuf[256]; 1556 1557 if (pZip->getEntryFileName(entry, nameBuf, sizeof(nameBuf)) != 0) { 1558 // TODO: fix this if we expect to have long names 1559 ALOGE("ARGH: name too long?\n"); 1560 continue; 1561 } 1562 //printf("Comparing %s in %s?\n", nameBuf, dirName.string()); 1563 if (dirNameLen == 0 || nameBuf[dirNameLen] == '/') 1564 { 1565 const char* cp; 1566 const char* nextSlash; 1567 1568 cp = nameBuf + dirNameLen; 1569 if (dirNameLen != 0) 1570 cp++; // advance past the '/' 1571 1572 nextSlash = strchr(cp, '/'); 1573//xxx this may break if there are bare directory entries 1574 if (nextSlash == NULL) { 1575 /* this is a file in the requested directory */ 1576 1577 info.set(String8(nameBuf).getPathLeaf(), kFileTypeRegular); 1578 1579 info.setSourceName( 1580 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1581 1582 contents.add(info); 1583 //printf("FOUND: file '%s'\n", info.getFileName().string()); 1584 } else { 1585 /* this is a subdir; add it if we don't already have it*/ 1586 String8 subdirName(cp, nextSlash - cp); 1587 size_t j; 1588 size_t N = dirs.size(); 1589 1590 for (j = 0; j < N; j++) { 1591 if (subdirName == dirs[j]) { 1592 break; 1593 } 1594 } 1595 if (j == N) { 1596 dirs.add(subdirName); 1597 } 1598 1599 //printf("FOUND: dir '%s'\n", subdirName.string()); 1600 } 1601 } 1602 } 1603 1604 pZip->endIteration(iterationCookie); 1605 1606 /* 1607 * Add the set of unique directories. 1608 */ 1609 for (int i = 0; i < (int) dirs.size(); i++) { 1610 info.set(dirs[i], kFileTypeDirectory); 1611 info.setSourceName( 1612 createZipSourceNameLocked(zipName, dirName, info.getFileName())); 1613 contents.add(info); 1614 } 1615 1616 mergeInfoLocked(pMergedInfo, &contents); 1617 1618 return true; 1619} 1620 1621 1622/* 1623 * Merge two vectors of FileInfo. 1624 * 1625 * The merged contents will be stuffed into *pMergedInfo. 1626 * 1627 * If an entry for a file exists in both "pMergedInfo" and "pContents", 1628 * we use the newer "pContents" entry. 1629 */ 1630void AssetManager::mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1631 const SortedVector<AssetDir::FileInfo>* pContents) 1632{ 1633 /* 1634 * Merge what we found in this directory with what we found in 1635 * other places. 1636 * 1637 * Two basic approaches: 1638 * (1) Create a new array that holds the unique values of the two 1639 * arrays. 1640 * (2) Take the elements from pContents and shove them into pMergedInfo. 1641 * 1642 * Because these are vectors of complex objects, moving elements around 1643 * inside the vector requires constructing new objects and allocating 1644 * storage for members. With approach #1, we're always adding to the 1645 * end, whereas with #2 we could be inserting multiple elements at the 1646 * front of the vector. Approach #1 requires a full copy of the 1647 * contents of pMergedInfo, but approach #2 requires the same copy for 1648 * every insertion at the front of pMergedInfo. 1649 * 1650 * (We should probably use a SortedVector interface that allows us to 1651 * just stuff items in, trusting us to maintain the sort order.) 1652 */ 1653 SortedVector<AssetDir::FileInfo>* pNewSorted; 1654 int mergeMax, contMax; 1655 int mergeIdx, contIdx; 1656 1657 pNewSorted = new SortedVector<AssetDir::FileInfo>; 1658 mergeMax = pMergedInfo->size(); 1659 contMax = pContents->size(); 1660 mergeIdx = contIdx = 0; 1661 1662 while (mergeIdx < mergeMax || contIdx < contMax) { 1663 if (mergeIdx == mergeMax) { 1664 /* hit end of "merge" list, copy rest of "contents" */ 1665 pNewSorted->add(pContents->itemAt(contIdx)); 1666 contIdx++; 1667 } else if (contIdx == contMax) { 1668 /* hit end of "cont" list, copy rest of "merge" */ 1669 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1670 mergeIdx++; 1671 } else if (pMergedInfo->itemAt(mergeIdx) == pContents->itemAt(contIdx)) 1672 { 1673 /* items are identical, add newer and advance both indices */ 1674 pNewSorted->add(pContents->itemAt(contIdx)); 1675 mergeIdx++; 1676 contIdx++; 1677 } else if (pMergedInfo->itemAt(mergeIdx) < pContents->itemAt(contIdx)) 1678 { 1679 /* "merge" is lower, add that one */ 1680 pNewSorted->add(pMergedInfo->itemAt(mergeIdx)); 1681 mergeIdx++; 1682 } else { 1683 /* "cont" is lower, add that one */ 1684 assert(pContents->itemAt(contIdx) < pMergedInfo->itemAt(mergeIdx)); 1685 pNewSorted->add(pContents->itemAt(contIdx)); 1686 contIdx++; 1687 } 1688 } 1689 1690 /* 1691 * Overwrite the "merged" list with the new stuff. 1692 */ 1693 *pMergedInfo = *pNewSorted; 1694 delete pNewSorted; 1695 1696#if 0 // for Vector, rather than SortedVector 1697 int i, j; 1698 for (i = pContents->size() -1; i >= 0; i--) { 1699 bool add = true; 1700 1701 for (j = pMergedInfo->size() -1; j >= 0; j--) { 1702 /* case-sensitive comparisons, to behave like UNIX fs */ 1703 if (strcmp(pContents->itemAt(i).mFileName, 1704 pMergedInfo->itemAt(j).mFileName) == 0) 1705 { 1706 /* match, don't add this entry */ 1707 add = false; 1708 break; 1709 } 1710 } 1711 1712 if (add) 1713 pMergedInfo->add(pContents->itemAt(i)); 1714 } 1715#endif 1716} 1717 1718 1719/* 1720 * Load all files into the file name cache. We want to do this across 1721 * all combinations of { appname, locale, vendor }, performing a recursive 1722 * directory traversal. 1723 * 1724 * This is not the most efficient data structure. Also, gathering the 1725 * information as we needed it (file-by-file or directory-by-directory) 1726 * would be faster. However, on the actual device, 99% of the files will 1727 * live in Zip archives, so this list will be very small. The trouble 1728 * is that we have to check the "loose" files first, so it's important 1729 * that we don't beat the filesystem silly looking for files that aren't 1730 * there. 1731 * 1732 * Note on thread safety: this is the only function that causes updates 1733 * to mCache, and anybody who tries to use it will call here if !mCacheValid, 1734 * so we need to employ a mutex here. 1735 */ 1736void AssetManager::loadFileNameCacheLocked(void) 1737{ 1738 assert(!mCacheValid); 1739 assert(mCache.size() == 0); 1740 1741#ifdef DO_TIMINGS // need to link against -lrt for this now 1742 DurationTimer timer; 1743 timer.start(); 1744#endif 1745 1746 fncScanLocked(&mCache, ""); 1747 1748#ifdef DO_TIMINGS 1749 timer.stop(); 1750 ALOGD("Cache scan took %.3fms\n", 1751 timer.durationUsecs() / 1000.0); 1752#endif 1753 1754#if 0 1755 int i; 1756 printf("CACHED FILE LIST (%d entries):\n", mCache.size()); 1757 for (i = 0; i < (int) mCache.size(); i++) { 1758 printf(" %d: (%d) '%s'\n", i, 1759 mCache.itemAt(i).getFileType(), 1760 (const char*) mCache.itemAt(i).getFileName()); 1761 } 1762#endif 1763 1764 mCacheValid = true; 1765} 1766 1767/* 1768 * Scan up to 8 versions of the specified directory. 1769 */ 1770void AssetManager::fncScanLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo, 1771 const char* dirName) 1772{ 1773 size_t i = mAssetPaths.size(); 1774 while (i > 0) { 1775 i--; 1776 const asset_path& ap = mAssetPaths.itemAt(i); 1777 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, NULL, dirName); 1778 if (mLocale != NULL) 1779 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, NULL, dirName); 1780 if (mVendor != NULL) 1781 fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, mVendor, dirName); 1782 if (mLocale != NULL && mVendor != NULL) 1783 fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, mVendor, dirName); 1784 } 1785} 1786 1787/* 1788 * Recursively scan this directory and all subdirs. 1789 * 1790 * This is similar to scanAndMergeDir, but we don't remove the .EXCLUDE 1791 * files, and we prepend the extended partial path to the filenames. 1792 */ 1793bool AssetManager::fncScanAndMergeDirLocked( 1794 SortedVector<AssetDir::FileInfo>* pMergedInfo, 1795 const asset_path& ap, const char* locale, const char* vendor, 1796 const char* dirName) 1797{ 1798 SortedVector<AssetDir::FileInfo>* pContents; 1799 String8 partialPath; 1800 String8 fullPath; 1801 1802 // XXX This is broken -- the filename cache needs to hold the base 1803 // asset path separately from its filename. 1804 1805 partialPath = createPathNameLocked(ap, locale, vendor); 1806 if (dirName[0] != '\0') { 1807 partialPath.appendPath(dirName); 1808 } 1809 1810 fullPath = partialPath; 1811 pContents = scanDirLocked(fullPath); 1812 if (pContents == NULL) { 1813 return false; // directory did not exist 1814 } 1815 1816 /* 1817 * Scan all subdirectories of the current dir, merging what we find 1818 * into "pMergedInfo". 1819 */ 1820 for (int i = 0; i < (int) pContents->size(); i++) { 1821 if (pContents->itemAt(i).getFileType() == kFileTypeDirectory) { 1822 String8 subdir(dirName); 1823 subdir.appendPath(pContents->itemAt(i).getFileName()); 1824 1825 fncScanAndMergeDirLocked(pMergedInfo, ap, locale, vendor, subdir.string()); 1826 } 1827 } 1828 1829 /* 1830 * To be consistent, we want entries for the root directory. If 1831 * we're the root, add one now. 1832 */ 1833 if (dirName[0] == '\0') { 1834 AssetDir::FileInfo tmpInfo; 1835 1836 tmpInfo.set(String8(""), kFileTypeDirectory); 1837 tmpInfo.setSourceName(createPathNameLocked(ap, locale, vendor)); 1838 pContents->add(tmpInfo); 1839 } 1840 1841 /* 1842 * We want to prepend the extended partial path to every entry in 1843 * "pContents". It's the same value for each entry, so this will 1844 * not change the sorting order of the vector contents. 1845 */ 1846 for (int i = 0; i < (int) pContents->size(); i++) { 1847 const AssetDir::FileInfo& info = pContents->itemAt(i); 1848 pContents->editItemAt(i).setFileName(partialPath.appendPathCopy(info.getFileName())); 1849 } 1850 1851 mergeInfoLocked(pMergedInfo, pContents); 1852 delete pContents; 1853 return true; 1854} 1855 1856/* 1857 * Trash the cache. 1858 */ 1859void AssetManager::purgeFileNameCacheLocked(void) 1860{ 1861 mCacheValid = false; 1862 mCache.clear(); 1863} 1864 1865/* 1866 * =========================================================================== 1867 * AssetManager::SharedZip 1868 * =========================================================================== 1869 */ 1870 1871 1872Mutex AssetManager::SharedZip::gLock; 1873DefaultKeyedVector<String8, wp<AssetManager::SharedZip> > AssetManager::SharedZip::gOpen; 1874 1875AssetManager::SharedZip::SharedZip(const String8& path, time_t modWhen) 1876 : mPath(path), mZipFile(NULL), mModWhen(modWhen), 1877 mResourceTableAsset(NULL), mResourceTable(NULL) 1878{ 1879 if (kIsDebug) { 1880 ALOGI("Creating SharedZip %p %s\n", this, (const char*)mPath); 1881 } 1882 ALOGV("+++ opening zip '%s'\n", mPath.string()); 1883 mZipFile = ZipFileRO::open(mPath.string()); 1884 if (mZipFile == NULL) { 1885 ALOGD("failed to open Zip archive '%s'\n", mPath.string()); 1886 } 1887} 1888 1889sp<AssetManager::SharedZip> AssetManager::SharedZip::get(const String8& path, 1890 bool createIfNotPresent) 1891{ 1892 AutoMutex _l(gLock); 1893 time_t modWhen = getFileModDate(path); 1894 sp<SharedZip> zip = gOpen.valueFor(path).promote(); 1895 if (zip != NULL && zip->mModWhen == modWhen) { 1896 return zip; 1897 } 1898 if (zip == NULL && !createIfNotPresent) { 1899 return NULL; 1900 } 1901 zip = new SharedZip(path, modWhen); 1902 gOpen.add(path, zip); 1903 return zip; 1904 1905} 1906 1907ZipFileRO* AssetManager::SharedZip::getZip() 1908{ 1909 return mZipFile; 1910} 1911 1912Asset* AssetManager::SharedZip::getResourceTableAsset() 1913{ 1914 ALOGV("Getting from SharedZip %p resource asset %p\n", this, mResourceTableAsset); 1915 return mResourceTableAsset; 1916} 1917 1918Asset* AssetManager::SharedZip::setResourceTableAsset(Asset* asset) 1919{ 1920 { 1921 AutoMutex _l(gLock); 1922 if (mResourceTableAsset == NULL) { 1923 mResourceTableAsset = asset; 1924 // This is not thread safe the first time it is called, so 1925 // do it here with the global lock held. 1926 asset->getBuffer(true); 1927 return asset; 1928 } 1929 } 1930 delete asset; 1931 return mResourceTableAsset; 1932} 1933 1934ResTable* AssetManager::SharedZip::getResourceTable() 1935{ 1936 ALOGV("Getting from SharedZip %p resource table %p\n", this, mResourceTable); 1937 return mResourceTable; 1938} 1939 1940ResTable* AssetManager::SharedZip::setResourceTable(ResTable* res) 1941{ 1942 { 1943 AutoMutex _l(gLock); 1944 if (mResourceTable == NULL) { 1945 mResourceTable = res; 1946 return res; 1947 } 1948 } 1949 delete res; 1950 return mResourceTable; 1951} 1952 1953bool AssetManager::SharedZip::isUpToDate() 1954{ 1955 time_t modWhen = getFileModDate(mPath.string()); 1956 return mModWhen == modWhen; 1957} 1958 1959void AssetManager::SharedZip::addOverlay(const asset_path& ap) 1960{ 1961 mOverlays.add(ap); 1962} 1963 1964bool AssetManager::SharedZip::getOverlay(size_t idx, asset_path* out) const 1965{ 1966 if (idx >= mOverlays.size()) { 1967 return false; 1968 } 1969 *out = mOverlays[idx]; 1970 return true; 1971} 1972 1973AssetManager::SharedZip::~SharedZip() 1974{ 1975 if (kIsDebug) { 1976 ALOGI("Destroying SharedZip %p %s\n", this, (const char*)mPath); 1977 } 1978 if (mResourceTable != NULL) { 1979 delete mResourceTable; 1980 } 1981 if (mResourceTableAsset != NULL) { 1982 delete mResourceTableAsset; 1983 } 1984 if (mZipFile != NULL) { 1985 delete mZipFile; 1986 ALOGV("Closed '%s'\n", mPath.string()); 1987 } 1988} 1989 1990/* 1991 * =========================================================================== 1992 * AssetManager::ZipSet 1993 * =========================================================================== 1994 */ 1995 1996/* 1997 * Constructor. 1998 */ 1999AssetManager::ZipSet::ZipSet(void) 2000{ 2001} 2002 2003/* 2004 * Destructor. Close any open archives. 2005 */ 2006AssetManager::ZipSet::~ZipSet(void) 2007{ 2008 size_t N = mZipFile.size(); 2009 for (size_t i = 0; i < N; i++) 2010 closeZip(i); 2011} 2012 2013/* 2014 * Close a Zip file and reset the entry. 2015 */ 2016void AssetManager::ZipSet::closeZip(int idx) 2017{ 2018 mZipFile.editItemAt(idx) = NULL; 2019} 2020 2021 2022/* 2023 * Retrieve the appropriate Zip file from the set. 2024 */ 2025ZipFileRO* AssetManager::ZipSet::getZip(const String8& path) 2026{ 2027 int idx = getIndex(path); 2028 sp<SharedZip> zip = mZipFile[idx]; 2029 if (zip == NULL) { 2030 zip = SharedZip::get(path); 2031 mZipFile.editItemAt(idx) = zip; 2032 } 2033 return zip->getZip(); 2034} 2035 2036Asset* AssetManager::ZipSet::getZipResourceTableAsset(const String8& path) 2037{ 2038 int idx = getIndex(path); 2039 sp<SharedZip> zip = mZipFile[idx]; 2040 if (zip == NULL) { 2041 zip = SharedZip::get(path); 2042 mZipFile.editItemAt(idx) = zip; 2043 } 2044 return zip->getResourceTableAsset(); 2045} 2046 2047Asset* AssetManager::ZipSet::setZipResourceTableAsset(const String8& path, 2048 Asset* asset) 2049{ 2050 int idx = getIndex(path); 2051 sp<SharedZip> zip = mZipFile[idx]; 2052 // doesn't make sense to call before previously accessing. 2053 return zip->setResourceTableAsset(asset); 2054} 2055 2056ResTable* AssetManager::ZipSet::getZipResourceTable(const String8& path) 2057{ 2058 int idx = getIndex(path); 2059 sp<SharedZip> zip = mZipFile[idx]; 2060 if (zip == NULL) { 2061 zip = SharedZip::get(path); 2062 mZipFile.editItemAt(idx) = zip; 2063 } 2064 return zip->getResourceTable(); 2065} 2066 2067ResTable* AssetManager::ZipSet::setZipResourceTable(const String8& path, 2068 ResTable* res) 2069{ 2070 int idx = getIndex(path); 2071 sp<SharedZip> zip = mZipFile[idx]; 2072 // doesn't make sense to call before previously accessing. 2073 return zip->setResourceTable(res); 2074} 2075 2076/* 2077 * Generate the partial pathname for the specified archive. The caller 2078 * gets to prepend the asset root directory. 2079 * 2080 * Returns something like "common/en-US-noogle.jar". 2081 */ 2082/*static*/ String8 AssetManager::ZipSet::getPathName(const char* zipPath) 2083{ 2084 return String8(zipPath); 2085} 2086 2087bool AssetManager::ZipSet::isUpToDate() 2088{ 2089 const size_t N = mZipFile.size(); 2090 for (size_t i=0; i<N; i++) { 2091 if (mZipFile[i] != NULL && !mZipFile[i]->isUpToDate()) { 2092 return false; 2093 } 2094 } 2095 return true; 2096} 2097 2098void AssetManager::ZipSet::addOverlay(const String8& path, const asset_path& overlay) 2099{ 2100 int idx = getIndex(path); 2101 sp<SharedZip> zip = mZipFile[idx]; 2102 zip->addOverlay(overlay); 2103} 2104 2105bool AssetManager::ZipSet::getOverlay(const String8& path, size_t idx, asset_path* out) const 2106{ 2107 sp<SharedZip> zip = SharedZip::get(path, false); 2108 if (zip == NULL) { 2109 return false; 2110 } 2111 return zip->getOverlay(idx, out); 2112} 2113 2114/* 2115 * Compute the zip file's index. 2116 * 2117 * "appName", "locale", and "vendor" should be set to NULL to indicate the 2118 * default directory. 2119 */ 2120int AssetManager::ZipSet::getIndex(const String8& zip) const 2121{ 2122 const size_t N = mZipPath.size(); 2123 for (size_t i=0; i<N; i++) { 2124 if (mZipPath[i] == zip) { 2125 return i; 2126 } 2127 } 2128 2129 mZipPath.add(zip); 2130 mZipFile.add(NULL); 2131 2132 return mZipPath.size()-1; 2133} 2134