Initial Contribution

1 files changed, 1637 insertions, 0 deletions

diff --git a/libs/utils/AssetManager.cpp b/libs/utils/AssetManager.cpp
new file mode 100644
index 0000000..447b801
--- /dev/null
+++ b/libs/utils/AssetManager.cpp
@@ -0,0 +1,1637 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Provide access to read-only assets.
+//
+
+#define LOG_TAG "asset"
+//#define LOG_NDEBUG 0
+
+#include <utils/AssetManager.h>
+#include <utils/AssetDir.h>
+#include <utils/Asset.h>
+#include <utils/Atomic.h>
+#include <utils/String8.h>
+#include <utils/ResourceTypes.h>
+#include <utils/String8.h>
+#include <utils/ZipFileRO.h>
+#include <utils/Log.h>
+#include <utils/Timers.h>
+#include <utils/threads.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <assert.h>
+
+using namespace android;
+
+/*
+ * Names for default app, locale, and vendor.  We might want to change
+ * these to be an actual locale, e.g. always use en-US as the default.
+ */
+static const char* kDefaultLocale = "default";
+static const char* kDefaultVendor = "default";
+static const char* kAssetsRoot = "assets";
+static const char* kAppZipName = NULL; //"classes.jar";
+static const char* kSystemAssets = "framework/framework-res.apk";
+
+static const char* kExcludeExtension = ".EXCLUDE";
+
+static Asset* const kExcludedAsset = (Asset*) 0xd000000d;
+
+static volatile int32_t gCount = 0;
+
+
+/*
+ * ===========================================================================
+ *      AssetManager
+ * ===========================================================================
+ */
+
+int32_t AssetManager::getGlobalCount()
+{
+    return gCount;
+}
+
+AssetManager::AssetManager(CacheMode cacheMode)
+    : mLocale(NULL), mVendor(NULL),
+      mResources(NULL), mConfig(new ResTable_config),
+      mCacheMode(cacheMode), mCacheValid(false)
+{
+    int count = android_atomic_inc(&gCount)+1;
+    //LOGI("Creating AssetManager %p #%d\n", this, count);
+    memset(mConfig, 0, sizeof(ResTable_config));
+}
+
+AssetManager::~AssetManager(void)
+{
+    int count = android_atomic_dec(&gCount);
+    //LOGI("Destroying AssetManager in %p #%d\n", this, count);
+
+    delete mConfig;
+    delete mResources;
+
+    // don't have a String class yet, so make sure we clean up
+    delete[] mLocale;
+    delete[] mVendor;
+}
+
+bool AssetManager::addAssetPath(const String8& path, void** cookie)
+{
+    AutoMutex _l(mLock);
+
+    asset_path ap;
+
+    String8 realPath(path);
+    if (kAppZipName) {
+        realPath.appendPath(kAppZipName);
+    }
+    ap.type = ::getFileType(realPath.string());
+    if (ap.type == kFileTypeRegular) {
+        ap.path = realPath;
+    } else {
+        ap.path = path;
+        ap.type = ::getFileType(path.string());
+        if (ap.type != kFileTypeDirectory && ap.type != kFileTypeRegular) {
+            LOGW("Asset path %s is neither a directory nor file (type=%d).",
+                 path.string(), (int)ap.type);
+            return false;
+        }
+    }
+
+    // Skip if we have it already.
+    for (size_t i=0; i<mAssetPaths.size(); i++) {
+        if (mAssetPaths[i].path == ap.path) {
+            if (cookie) {
+                *cookie = (void*)(i+1);
+            }
+            return true;
+        }
+    }
+    
+    LOGV("In %p Asset %s path: %s", this,
+         ap.type == kFileTypeDirectory ? "dir" : "zip", ap.path.string());
+
+    mAssetPaths.add(ap);
+
+    // new paths are always added at the end
+    if (cookie) {
+        *cookie = (void*)mAssetPaths.size();
+    }
+
+    return true;
+}
+
+bool AssetManager::addDefaultAssets()
+{
+    const char* root = getenv("ANDROID_ROOT");
+    LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_ROOT not set");
+
+    String8 path(root);
+    path.appendPath(kSystemAssets);
+
+    return addAssetPath(path, NULL);
+}
+
+void* AssetManager::nextAssetPath(void* cookie) const
+{
+    AutoMutex _l(mLock);
+    size_t next = ((size_t)cookie)+1;
+    return next > mAssetPaths.size() ? NULL : (void*)next;
+}
+
+String8 AssetManager::getAssetPath(void* cookie) const
+{
+    AutoMutex _l(mLock);
+    const size_t which = ((size_t)cookie)-1;
+    if (which < mAssetPaths.size()) {
+        return mAssetPaths[which].path;
+    }
+    return String8();
+}
+
+/*
+ * Set the current locale.  Use NULL to indicate no locale.
+ *
+ * Close and reopen Zip archives as appropriate, and reset cached
+ * information in the locale-specific sections of the tree.
+ */
+void AssetManager::setLocale(const char* locale)
+{
+    AutoMutex _l(mLock);
+    setLocaleLocked(locale);
+}
+
+void AssetManager::setLocaleLocked(const char* locale)
+{
+    if (mLocale != NULL) {
+        /* previously set, purge cached data */
+        purgeFileNameCacheLocked();
+        //mZipSet.purgeLocale();
+        delete[] mLocale;
+    }
+    mLocale = strdupNew(locale);
+    
+    updateResourceParamsLocked();
+}
+
+/*
+ * Set the current vendor.  Use NULL to indicate no vendor.
+ *
+ * Close and reopen Zip archives as appropriate, and reset cached
+ * information in the vendor-specific sections of the tree.
+ */
+void AssetManager::setVendor(const char* vendor)
+{
+    AutoMutex _l(mLock);
+
+    if (mVendor != NULL) {
+        /* previously set, purge cached data */
+        purgeFileNameCacheLocked();
+        //mZipSet.purgeVendor();
+        delete[] mVendor;
+    }
+    mVendor = strdupNew(vendor);
+}
+
+void AssetManager::setConfiguration(const ResTable_config& config, const char* locale)
+{
+    AutoMutex _l(mLock);
+    *mConfig = config;
+    if (locale) {
+        setLocaleLocked(locale);
+    } else if (config.language[0] != 0) {
+        char spec[9];
+        spec[0] = config.language[0];
+        spec[1] = config.language[1];
+        if (config.country[0] != 0) {
+            spec[2] = '_';
+            spec[3] = config.country[0];
+            spec[4] = config.country[1];
+            spec[5] = 0;
+        } else {
+            spec[3] = 0;
+        }
+        setLocaleLocked(spec);
+    } else {
+        updateResourceParamsLocked();
+    }
+}
+
+/*
+ * Open an asset.
+ *
+ * The data could be;
+ *  - In a file on disk (assetBase + fileName).
+ *  - In a compressed file on disk (assetBase + fileName.gz).
+ *  - In a Zip archive, uncompressed or compressed.
+ *
+ * It can be in a number of different directories and Zip archives.
+ * The search order is:
+ *  - [appname]
+ *    - locale + vendor
+ *    - "default" + vendor
+ *    - locale + "default"
+ *    - "default + "default"
+ *  - "common"
+ *    - (same as above)
+ *
+ * To find a particular file, we have to try up to eight paths with
+ * all three forms of data.
+ *
+ * We should probably reject requests for "illegal" filenames, e.g. those
+ * with illegal characters or "../" backward relative paths.
+ */
+Asset* AssetManager::open(const char* fileName, AccessMode mode)
+{
+    AutoMutex _l(mLock);
+
+    LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager");
+
+
+    if (mCacheMode != CACHE_OFF && !mCacheValid)
+        loadFileNameCacheLocked();
+
+    String8 assetName(kAssetsRoot);
+    assetName.appendPath(fileName);
+
+    /*
+     * For each top-level asset path, search for the asset.
+     */
+
+    size_t i = mAssetPaths.size();
+    while (i > 0) {
+        i--;
+        LOGV("Looking for asset '%s' in '%s'\n",
+                assetName.string(), mAssetPaths.itemAt(i).path.string());
+        Asset* pAsset = openNonAssetInPathLocked(assetName.string(), mode, mAssetPaths.itemAt(i));
+        if (pAsset != NULL) {
+            return pAsset != kExcludedAsset ? pAsset : NULL;
+        }
+    }
+
+    return NULL;
+}
+
+/*
+ * Open a non-asset file as if it were an asset.
+ *
+ * The "fileName" is the partial path starting from the application
+ * name.
+ */
+Asset* AssetManager::openNonAsset(const char* fileName, AccessMode mode)
+{
+    AutoMutex _l(mLock);
+
+    LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager");
+
+
+    if (mCacheMode != CACHE_OFF && !mCacheValid)
+        loadFileNameCacheLocked();
+
+    /*
+     * For each top-level asset path, search for the asset.
+     */
+
+    size_t i = mAssetPaths.size();
+    while (i > 0) {
+        i--;
+        LOGV("Looking for non-asset '%s' in '%s'\n", fileName, mAssetPaths.itemAt(i).path.string());
+        Asset* pAsset = openNonAssetInPathLocked(
+            fileName, mode, mAssetPaths.itemAt(i));
+        if (pAsset != NULL) {
+            return pAsset != kExcludedAsset ? pAsset : NULL;
+        }
+    }
+
+    return NULL;
+}
+
+Asset* AssetManager::openNonAsset(void* cookie, const char* fileName, AccessMode mode)
+{
+    const size_t which = ((size_t)cookie)-1;
+
+    AutoMutex _l(mLock);
+
+    LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager");
+
+
+    if (mCacheMode != CACHE_OFF && !mCacheValid)
+        loadFileNameCacheLocked();
+
+    if (which < mAssetPaths.size()) {
+        LOGV("Looking for non-asset '%s' in '%s'\n", fileName,
+                mAssetPaths.itemAt(which).path.string());
+        Asset* pAsset = openNonAssetInPathLocked(
+            fileName, mode, mAssetPaths.itemAt(which));
+        if (pAsset != NULL) {
+            return pAsset != kExcludedAsset ? pAsset : NULL;
+        }
+    }
+
+    return NULL;
+}
+
+/*
+ * Get the type of a file in the asset namespace.
+ *
+ * This currently only works for regular files.  All others (including
+ * directories) will return kFileTypeNonexistent.
+ */
+FileType AssetManager::getFileType(const char* fileName)
+{
+    Asset* pAsset = NULL;
+
+    /*
+     * Open the asset.  This is less efficient than simply finding the
+     * file, but it's not too bad (we don't uncompress or mmap data until
+     * the first read() call).
+     */
+    pAsset = open(fileName, Asset::ACCESS_STREAMING);
+    delete pAsset;
+
+    if (pAsset == NULL)
+        return kFileTypeNonexistent;
+    else
+        return kFileTypeRegular;
+}
+
+const ResTable* AssetManager::getResTable(bool required) const
+{
+    ResTable* rt = mResources;
+    if (rt) {
+        return rt;
+    }
+
+    // Iterate through all asset packages, collecting resources from each.
+
+    AutoMutex _l(mLock);
+
+    if (mResources != NULL) {
+        return mResources;
+    }
+
+    if (required) {
+        LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager");
+    }
+
+    if (mCacheMode != CACHE_OFF && !mCacheValid)
+        const_cast<AssetManager*>(this)->loadFileNameCacheLocked();
+
+    const size_t N = mAssetPaths.size();
+    for (size_t i=0; i<N; i++) {
+        Asset* ass = NULL;
+        bool shared = true;
+        const asset_path& ap = mAssetPaths.itemAt(i);
+        LOGV("Looking for resource asset in '%s'\n", ap.path.string());
+        if (ap.type != kFileTypeDirectory) {
+            ass = const_cast<AssetManager*>(this)->
+                mZipSet.getZipResourceTable(ap.path);
+            if (ass == NULL) {
+                LOGV("loading resource table %s\n", ap.path.string());
+                ass = const_cast<AssetManager*>(this)->
+                    openNonAssetInPathLocked("resources.arsc",
+                                             Asset::ACCESS_BUFFER,
+                                             ap);
+                if (ass != NULL && ass != kExcludedAsset) {
+                    ass = const_cast<AssetManager*>(this)->
+                        mZipSet.setZipResourceTable(ap.path, ass);
+                }
+            }
+        } else {
+            LOGV("loading resource table %s\n", ap.path.string());
+            Asset* ass = const_cast<AssetManager*>(this)->
+                openNonAssetInPathLocked("resources.arsc",
+                                         Asset::ACCESS_BUFFER,
+                                         ap);
+            shared = false;
+        }
+        if (ass != NULL && ass != kExcludedAsset) {
+            if (rt == NULL) {
+                mResources = rt = new ResTable();
+                updateResourceParamsLocked();
+            }
+            LOGV("Installing resource asset %p in to table %p\n", ass, mResources);
+            rt->add(ass, (void*)(i+1), !shared);
+
+            if (!shared) {
+                delete ass;
+            }
+        }
+    }
+
+    if (required && !rt) LOGW("Unable to find resources file resources.arsc");
+    if (!rt) {
+        mResources = rt = new ResTable();
+    }
+    return rt;
+}
+
+void AssetManager::updateResourceParamsLocked() const
+{
+    ResTable* res = mResources;
+    if (!res) {
+        return;
+    }
+
+    size_t llen = mLocale ? strlen(mLocale) : 0;
+    mConfig->language[0] = 0;
+    mConfig->language[1] = 0;
+    mConfig->country[0] = 0;
+    mConfig->country[1] = 0;
+    if (llen >= 2) {
+        mConfig->language[0] = mLocale[0];
+        mConfig->language[1] = mLocale[1];
+    }
+    if (llen >= 5) {
+        mConfig->country[0] = mLocale[3];
+        mConfig->country[1] = mLocale[4];
+    }
+    mConfig->size = sizeof(*mConfig);
+
+    res->setParameters(mConfig);
+}
+
+const ResTable& AssetManager::getResources(bool required) const
+{
+    const ResTable* rt = getResTable(required);
+    return *rt;
+}
+
+bool AssetManager::isUpToDate()
+{
+    AutoMutex _l(mLock);
+    return mZipSet.isUpToDate();
+}
+
+void AssetManager::getLocales(Vector<String8>* locales) const
+{
+    ResTable* res = mResources;
+    if (res != NULL) {
+        res->getLocales(locales);
+    }
+}
+
+/*
+ * Open a non-asset file as if it were an asset, searching for it in the
+ * specified app.
+ *
+ * Pass in a NULL values for "appName" if the common app directory should
+ * be used.
+ */
+Asset* AssetManager::openNonAssetInPathLocked(const char* fileName, AccessMode mode,
+    const asset_path& ap)
+{
+    Asset* pAsset = NULL;
+
+    /* look at the filesystem on disk */
+    if (ap.type == kFileTypeDirectory) {
+        String8 path(ap.path);
+        path.appendPath(fileName);
+
+        pAsset = openAssetFromFileLocked(path, mode);
+
+        if (pAsset == NULL) {
+            /* try again, this time with ".gz" */
+            path.append(".gz");
+            pAsset = openAssetFromFileLocked(path, mode);
+        }
+
+        if (pAsset != NULL) {
+            //printf("FOUND NA '%s' on disk\n", fileName);
+            pAsset->setAssetSource(path);
+        }
+
+    /* look inside the zip file */
+    } else {
+        String8 path(fileName);
+
+        /* check the appropriate Zip file */
+        ZipFileRO* pZip;
+        ZipEntryRO entry;
+
+        pZip = getZipFileLocked(ap);
+        if (pZip != NULL) {
+            //printf("GOT zip, checking NA '%s'\n", (const char*) path);
+            entry = pZip->findEntryByName(path.string());
+            if (entry != NULL) {
+                //printf("FOUND NA in Zip file for %s\n", appName ? appName : kAppCommon);
+                pAsset = openAssetFromZipLocked(pZip, entry, mode, path);
+            }
+        }
+
+        if (pAsset != NULL) {
+            /* create a "source" name, for debug/display */
+            pAsset->setAssetSource(
+                    createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()), String8(""),
+                                                String8(fileName)));
+        }
+    }
+
+    return pAsset;
+}
+
+/*
+ * Open an asset, searching for it in the directory hierarchy for the
+ * specified app.
+ *
+ * Pass in a NULL values for "appName" if the common app directory should
+ * be used.
+ */
+Asset* AssetManager::openInPathLocked(const char* fileName, AccessMode mode,
+    const asset_path& ap)
+{
+    Asset* pAsset = NULL;
+
+    /*
+     * Try various combinations of locale and vendor.
+     */
+    if (mLocale != NULL && mVendor != NULL)
+        pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, mVendor);
+    if (pAsset == NULL && mVendor != NULL)
+        pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, mVendor);
+    if (pAsset == NULL && mLocale != NULL)
+        pAsset = openInLocaleVendorLocked(fileName, mode, ap, mLocale, NULL);
+    if (pAsset == NULL)
+        pAsset = openInLocaleVendorLocked(fileName, mode, ap, NULL, NULL);
+
+    return pAsset;
+}
+
+/*
+ * Open an asset, searching for it in the directory hierarchy for the
+ * specified locale and vendor.
+ *
+ * We also search in "app.jar".
+ *
+ * Pass in NULL values for "appName", "locale", and "vendor" if the
+ * defaults should be used.
+ */
+Asset* AssetManager::openInLocaleVendorLocked(const char* fileName, AccessMode mode,
+    const asset_path& ap, const char* locale, const char* vendor)
+{
+    Asset* pAsset = NULL;
+
+    if (ap.type == kFileTypeDirectory) {
+        if (mCacheMode == CACHE_OFF) {
+            /* look at the filesystem on disk */
+            String8 path(createPathNameLocked(ap, locale, vendor));
+            path.appendPath(fileName);
+    
+            String8 excludeName(path);
+            excludeName.append(kExcludeExtension);
+            if (::getFileType(excludeName.string()) != kFileTypeNonexistent) {
+                /* say no more */
+                //printf("+++ excluding '%s'\n", (const char*) excludeName);
+                return kExcludedAsset;
+            }
+    
+            pAsset = openAssetFromFileLocked(path, mode);
+    
+            if (pAsset == NULL) {
+                /* try again, this time with ".gz" */
+                path.append(".gz");
+                pAsset = openAssetFromFileLocked(path, mode);
+            }
+    
+            if (pAsset != NULL)
+                pAsset->setAssetSource(path);
+        } else {
+            /* find in cache */
+            String8 path(createPathNameLocked(ap, locale, vendor));
+            path.appendPath(fileName);
+    
+            AssetDir::FileInfo tmpInfo;
+            bool found = false;
+    
+            String8 excludeName(path);
+            excludeName.append(kExcludeExtension);
+    
+            if (mCache.indexOf(excludeName) != NAME_NOT_FOUND) {
+                /* go no farther */
+                //printf("+++ Excluding '%s'\n", (const char*) excludeName);
+                return kExcludedAsset;
+            }
+
+            /*
+             * File compression extensions (".gz") don't get stored in the
+             * name cache, so we have to try both here.
+             */
+            if (mCache.indexOf(path) != NAME_NOT_FOUND) {
+                found = true;
+                pAsset = openAssetFromFileLocked(path, mode);
+                if (pAsset == NULL) {
+                    /* try again, this time with ".gz" */
+                    path.append(".gz");
+                    pAsset = openAssetFromFileLocked(path, mode);
+                }
+            }
+
+            if (pAsset != NULL)
+                pAsset->setAssetSource(path);
+
+            /*
+             * Don't continue the search into the Zip files.  Our cached info
+             * said it was a file on disk; to be consistent with openDir()
+             * we want to return the loose asset.  If the cached file gets
+             * removed, we fail.
+             *
+             * The alternative is to update our cache when files get deleted,
+             * or make some sort of "best effort" promise, but for now I'm
+             * taking the hard line.
+             */
+            if (found) {
+                if (pAsset == NULL)
+                    LOGD("Expected file not found: '%s'\n", path.string());
+                return pAsset;
+            }
+        }
+    }
+
+    /*
+     * Either it wasn't found on disk or on the cached view of the disk.
+     * Dig through the currently-opened set of Zip files.  If caching
+     * is disabled, the Zip file may get reopened.
+     */
+    if (pAsset == NULL && ap.type == kFileTypeRegular) {
+        String8 path;
+
+        path.appendPath((locale != NULL) ? locale : kDefaultLocale);
+        path.appendPath((vendor != NULL) ? vendor : kDefaultVendor);
+        path.appendPath(fileName);
+
+        /* check the appropriate Zip file */
+        ZipFileRO* pZip;
+        ZipEntryRO entry;
+
+        pZip = getZipFileLocked(ap);
+        if (pZip != NULL) {
+            //printf("GOT zip, checking '%s'\n", (const char*) path);
+            entry = pZip->findEntryByName(path.string());
+            if (entry != NULL) {
+                //printf("FOUND in Zip file for %s/%s-%s\n",
+                //    appName, locale, vendor);
+                pAsset = openAssetFromZipLocked(pZip, entry, mode, path);
+            }
+        }
+
+        if (pAsset != NULL) {
+            /* create a "source" name, for debug/display */
+            pAsset->setAssetSource(createZipSourceNameLocked(ZipSet::getPathName(ap.path.string()),
+                                                             String8(""), String8(fileName)));
+        }
+    }
+
+    return pAsset;
+}
+
+/*
+ * Create a "source name" for a file from a Zip archive.
+ */
+String8 AssetManager::createZipSourceNameLocked(const String8& zipFileName,
+    const String8& dirName, const String8& fileName)
+{
+    String8 sourceName("zip:");
+    sourceName.append(zipFileName);
+    sourceName.append(":");
+    if (dirName.length() > 0) {
+        sourceName.appendPath(dirName);
+    }
+    sourceName.appendPath(fileName);
+    return sourceName;
+}
+
+/*
+ * Create a path to a loose asset (asset-base/app/locale/vendor).
+ */
+String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* locale,
+    const char* vendor)
+{
+    String8 path(ap.path);
+    path.appendPath((locale != NULL) ? locale : kDefaultLocale);
+    path.appendPath((vendor != NULL) ? vendor : kDefaultVendor);
+    return path;
+}
+
+/*
+ * Create a path to a loose asset (asset-base/app/rootDir).
+ */
+String8 AssetManager::createPathNameLocked(const asset_path& ap, const char* rootDir)
+{
+    String8 path(ap.path);
+    if (rootDir != NULL) path.appendPath(rootDir);
+    return path;
+}
+
+/*
+ * Return a pointer to one of our open Zip archives.  Returns NULL if no
+ * matching Zip file exists.
+ *
+ * Right now we have 2 possible Zip files (1 each in app/"common").
+ *
+ * If caching is set to CACHE_OFF, to get the expected behavior we
+ * need to reopen the Zip file on every request.  That would be silly
+ * and expensive, so instead we just check the file modification date.
+ *
+ * Pass in NULL values for "appName", "locale", and "vendor" if the
+ * generics should be used.
+ */
+ZipFileRO* AssetManager::getZipFileLocked(const asset_path& ap)
+{
+    LOGV("getZipFileLocked() in %p\n", this);
+
+    return mZipSet.getZip(ap.path);
+}
+
+/*
+ * Try to open an asset from a file on disk.
+ *
+ * If the file is compressed with gzip, we seek to the start of the
+ * deflated data and pass that in (just like we would for a Zip archive).
+ *
+ * For uncompressed data, we may already have an mmap()ed version sitting
+ * around.  If so, we want to hand that to the Asset instead.
+ *
+ * This returns NULL if the file doesn't exist, couldn't be opened, or
+ * claims to be a ".gz" but isn't.
+ */
+Asset* AssetManager::openAssetFromFileLocked(const String8& pathName,
+    AccessMode mode)
+{
+    Asset* pAsset = NULL;
+
+    if (strcasecmp(pathName.getPathExtension().string(), ".gz") == 0) {
+        //printf("TRYING '%s'\n", (const char*) pathName);
+        pAsset = Asset::createFromCompressedFile(pathName.string(), mode);
+    } else {
+        //printf("TRYING '%s'\n", (const char*) pathName);
+        pAsset = Asset::createFromFile(pathName.string(), mode);
+    }
+
+    return pAsset;
+}
+
+/*
+ * Given an entry in a Zip archive, create a new Asset object.
+ *
+ * If the entry is uncompressed, we may want to create or share a
+ * slice of shared memory.
+ */
+Asset* AssetManager::openAssetFromZipLocked(const ZipFileRO* pZipFile,
+    const ZipEntryRO entry, AccessMode mode, const String8& entryName)
+{
+    Asset* pAsset = NULL;
+
+    // TODO: look for previously-created shared memory slice?
+    int method;
+    long uncompressedLen;
+
+    //printf("USING Zip '%s'\n", pEntry->getFileName());
+
+    //pZipFile->getEntryInfo(entry, &method, &uncompressedLen, &compressedLen,
+    //    &offset);
+    if (!pZipFile->getEntryInfo(entry, &method, &uncompressedLen, NULL, NULL,
+            NULL, NULL))
+    {
+        LOGW("getEntryInfo failed\n");
+        return NULL;
+    }
+
+    FileMap* dataMap = pZipFile->createEntryFileMap(entry);
+    if (dataMap == NULL) {
+        LOGW("create map from entry failed\n");
+        return NULL;
+    }
+
+    if (method == ZipFileRO::kCompressStored) {
+        pAsset = Asset::createFromUncompressedMap(dataMap, mode);
+        LOGV("Opened uncompressed entry %s in zip %s mode %d: %p", entryName.string(),
+                dataMap->getFileName(), mode, pAsset);
+    } else {
+        pAsset = Asset::createFromCompressedMap(dataMap, method,
+            uncompressedLen, mode);
+        LOGV("Opened compressed entry %s in zip %s mode %d: %p", entryName.string(),
+                dataMap->getFileName(), mode, pAsset);
+    }
+    if (pAsset == NULL) {
+        /* unexpected */
+        LOGW("create from segment failed\n");
+    }
+
+    return pAsset;
+}
+
+
+
+/*
+ * Open a directory in the asset namespace.
+ *
+ * An "asset directory" is simply the combination of all files in all
+ * locations, with ".gz" stripped for loose files.  With app, locale, and
+ * vendor defined, we have 8 directories and 2 Zip archives to scan.
+ *
+ * Pass in "" for the root dir.
+ */
+AssetDir* AssetManager::openDir(const char* dirName)
+{
+    AutoMutex _l(mLock);
+
+    AssetDir* pDir = NULL;
+    SortedVector<AssetDir::FileInfo>* pMergedInfo = NULL;
+
+    LOG_FATAL_IF(mAssetPaths.size() == 0, "No assets added to AssetManager");
+    assert(dirName != NULL);
+
+    //printf("+++ openDir(%s) in '%s'\n", dirName, (const char*) mAssetBase);
+
+    if (mCacheMode != CACHE_OFF && !mCacheValid)
+        loadFileNameCacheLocked();
+
+    pDir = new AssetDir;
+
+    /*
+     * Scan the various directories, merging what we find into a single
+     * vector.  We want to scan them in reverse priority order so that
+     * the ".EXCLUDE" processing works correctly.  Also, if we decide we
+     * want to remember where the file is coming from, we'll get the right
+     * version.
+     *
+     * We start with Zip archives, then do loose files.
+     */
+    pMergedInfo = new SortedVector<AssetDir::FileInfo>;
+
+    size_t i = mAssetPaths.size();
+    while (i > 0) {
+        i--;
+        const asset_path& ap = mAssetPaths.itemAt(i);
+        if (ap.type == kFileTypeRegular) {
+            LOGV("Adding directory %s from zip %s", dirName, ap.path.string());
+            scanAndMergeZipLocked(pMergedInfo, ap, kAssetsRoot, dirName);
+        } else {
+            LOGV("Adding directory %s from dir %s", dirName, ap.path.string());
+            scanAndMergeDirLocked(pMergedInfo, ap, kAssetsRoot, dirName);
+        }
+    }
+
+#if 0
+    printf("FILE LIST:\n");
+    for (i = 0; i < (size_t) pMergedInfo->size(); i++) {
+        printf(" %d: (%d) '%s'\n", i,
+            pMergedInfo->itemAt(i).getFileType(),
+            (const char*) pMergedInfo->itemAt(i).getFileName());
+    }
+#endif
+
+    pDir->setFileList(pMergedInfo);
+    return pDir;
+}
+
+/*
+ * Scan the contents of the specified directory and merge them into the
+ * "pMergedInfo" vector, removing previous entries if we find "exclude"
+ * directives.
+ *
+ * Returns "false" if we found nothing to contribute.
+ */
+bool AssetManager::scanAndMergeDirLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
+    const asset_path& ap, const char* rootDir, const char* dirName)
+{
+    SortedVector<AssetDir::FileInfo>* pContents;
+    String8 path;
+
+    assert(pMergedInfo != NULL);
+
+    //printf("scanAndMergeDir: %s %s %s %s\n", appName, locale, vendor,dirName);
+
+    if (mCacheValid) {
+        int i, start, count;
+
+        pContents = new SortedVector<AssetDir::FileInfo>;
+
+        /*
+         * Get the basic partial path and find it in the cache.  That's
+         * the start point for the search.
+         */
+        path = createPathNameLocked(ap, rootDir);
+        if (dirName[0] != '\0')
+            path.appendPath(dirName);
+
+        start = mCache.indexOf(path);
+        if (start == NAME_NOT_FOUND) {
+            //printf("+++ not found in cache: dir '%s'\n", (const char*) path);
+            delete pContents;
+            return false;
+        }
+
+        /*
+         * The match string looks like "common/default/default/foo/bar/".
+         * The '/' on the end ensures that we don't match on the directory
+         * itself or on ".../foo/barfy/".
+         */
+        path.append("/");
+
+        count = mCache.size();
+
+        /*
+         * Pick out the stuff in the current dir by examining the pathname.
+         * It needs to match the partial pathname prefix, and not have a '/'
+         * (fssep) anywhere after the prefix.
+         */
+        for (i = start+1; i < count; i++) {
+            if (mCache[i].getFileName().length() > path.length() &&
+                strncmp(mCache[i].getFileName().string(), path.string(), path.length()) == 0)
+            {
+                const char* name = mCache[i].getFileName().string();
+                // XXX THIS IS BROKEN!  Looks like we need to store the full
+                // path prefix separately from the file path.
+                if (strchr(name + path.length(), '/') == NULL) {
+                    /* grab it, reducing path to just the filename component */
+                    AssetDir::FileInfo tmp = mCache[i];
+                    tmp.setFileName(tmp.getFileName().getPathLeaf());
+                    pContents->add(tmp);
+                }
+            } else {
+                /* no longer in the dir or its subdirs */
+                break;
+            }
+
+        }
+    } else {
+        path = createPathNameLocked(ap, rootDir);
+        if (dirName[0] != '\0')
+            path.appendPath(dirName);
+        pContents = scanDirLocked(path);
+        if (pContents == NULL)
+            return false;
+    }
+
+    // if we wanted to do an incremental cache fill, we would do it here
+
+    /*
+     * Process "exclude" directives.  If we find a filename that ends with
+     * ".EXCLUDE", we look for a matching entry in the "merged" set, and
+     * remove it if we find it.  We also delete the "exclude" entry.
+     */
+    int i, count, exclExtLen;
+
+    count = pContents->size();
+    exclExtLen = strlen(kExcludeExtension);
+    for (i = 0; i < count; i++) {
+        const char* name;
+        int nameLen;
+
+        name = pContents->itemAt(i).getFileName().string();
+        nameLen = strlen(name);
+        if (nameLen > exclExtLen &&
+            strcmp(name + (nameLen - exclExtLen), kExcludeExtension) == 0)
+        {
+            String8 match(name, nameLen - exclExtLen);
+            int matchIdx;
+
+            matchIdx = AssetDir::FileInfo::findEntry(pMergedInfo, match);
+            if (matchIdx > 0) {
+                LOGV("Excluding '%s' [%s]\n",
+                    pMergedInfo->itemAt(matchIdx).getFileName().string(),
+                    pMergedInfo->itemAt(matchIdx).getSourceName().string());
+                pMergedInfo->removeAt(matchIdx);
+            } else {
+                //printf("+++ no match on '%s'\n", (const char*) match);
+            }
+
+            LOGD("HEY: size=%d removing %d\n", (int)pContents->size(), i);
+            pContents->removeAt(i);
+            i--;        // adjust "for" loop
+            count--;    //  and loop limit
+        }
+    }
+
+    mergeInfoLocked(pMergedInfo, pContents);
+
+    delete pContents;
+
+    return true;
+}
+
+/*
+ * Scan the contents of the specified directory, and stuff what we find
+ * into a newly-allocated vector.
+ *
+ * Files ending in ".gz" will have their extensions removed.
+ *
+ * We should probably think about skipping files with "illegal" names,
+ * e.g. illegal characters (/\:) or excessive length.
+ *
+ * Returns NULL if the specified directory doesn't exist.
+ */
+SortedVector<AssetDir::FileInfo>* AssetManager::scanDirLocked(const String8& path)
+{
+    SortedVector<AssetDir::FileInfo>* pContents = NULL;
+    DIR* dir;
+    struct dirent* entry;
+    FileType fileType;
+
+    LOGV("Scanning dir '%s'\n", path.string());
+
+    dir = opendir(path.string());
+    if (dir == NULL)
+        return NULL;
+
+    pContents = new SortedVector<AssetDir::FileInfo>;
+
+    while (1) {
+        entry = readdir(dir);
+        if (entry == NULL)
+            break;
+
+        if (strcmp(entry->d_name, ".") == 0 ||
+            strcmp(entry->d_name, "..") == 0)
+            continue;
+
+#ifdef _DIRENT_HAVE_D_TYPE
+        if (entry->d_type == DT_REG)
+            fileType = kFileTypeRegular;
+        else if (entry->d_type == DT_DIR)
+            fileType = kFileTypeDirectory;
+        else
+            fileType = kFileTypeUnknown;
+#else
+        // stat the file
+        fileType = ::getFileType(path.appendPathCopy(entry->d_name).string());
+#endif
+
+        if (fileType != kFileTypeRegular && fileType != kFileTypeDirectory)
+            continue;
+
+        AssetDir::FileInfo info;
+        info.set(String8(entry->d_name), fileType);
+        if (strcasecmp(info.getFileName().getPathExtension().string(), ".gz") == 0)
+            info.setFileName(info.getFileName().getBasePath());
+        info.setSourceName(path.appendPathCopy(info.getFileName()));
+        pContents->add(info);
+    }
+
+    closedir(dir);
+    return pContents;
+}
+
+/*
+ * Scan the contents out of the specified Zip archive, and merge what we
+ * find into "pMergedInfo".  If the Zip archive in question doesn't exist,
+ * we return immediately.
+ *
+ * Returns "false" if we found nothing to contribute.
+ */
+bool AssetManager::scanAndMergeZipLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
+    const asset_path& ap, const char* rootDir, const char* baseDirName)
+{
+    ZipFileRO* pZip;
+    Vector<String8> dirs;
+    AssetDir::FileInfo info;
+    SortedVector<AssetDir::FileInfo> contents;
+    String8 sourceName, zipName, dirName;
+
+    pZip = mZipSet.getZip(ap.path);
+    if (pZip == NULL) {
+        LOGW("Failure opening zip %s\n", ap.path.string());
+        return false;
+    }
+
+    zipName = ZipSet::getPathName(ap.path.string());
+
+    /* convert "sounds" to "rootDir/sounds" */
+    if (rootDir != NULL) dirName = rootDir;
+    dirName.appendPath(baseDirName);
+
+    /*
+     * Scan through the list of files, looking for a match.  The files in
+     * the Zip table of contents are not in sorted order, so we have to
+     * process the entire list.  We're looking for a string that begins
+     * with the characters in "dirName", is followed by a '/', and has no
+     * subsequent '/' in the stuff that follows.
+     *
+     * What makes this especially fun is that directories are not stored
+     * explicitly in Zip archives, so we have to infer them from context.
+     * When we see "sounds/foo.wav" we have to leave a note to ourselves
+     * to insert a directory called "sounds" into the list.  We store
+     * these in temporary vector so that we only return each one once.
+     *
+     * Name comparisons are case-sensitive to match UNIX filesystem
+     * semantics.
+     */
+    int dirNameLen = dirName.length();
+    for (int i = 0; i < pZip->getNumEntries(); i++) {
+        ZipEntryRO entry;
+        char nameBuf[256];
+
+        entry = pZip->findEntryByIndex(i);
+        if (pZip->getEntryFileName(entry, nameBuf, sizeof(nameBuf)) != 0) {
+            // TODO: fix this if we expect to have long names
+            LOGE("ARGH: name too long?\n");
+            continue;
+        }
+        if (dirNameLen == 0 ||
+            (strncmp(nameBuf, dirName.string(), dirNameLen) == 0 &&
+             nameBuf[dirNameLen] == '/'))
+        {
+            const char* cp;
+            const char* nextSlash;
+
+            cp = nameBuf + dirNameLen;
+            if (dirNameLen != 0)
+                cp++;       // advance past the '/'
+
+            nextSlash = strchr(cp, '/');
+//xxx this may break if there are bare directory entries
+            if (nextSlash == NULL) {
+                /* this is a file in the requested directory */
+
+                info.set(String8(nameBuf).getPathLeaf(), kFileTypeRegular);
+
+                info.setSourceName(
+                    createZipSourceNameLocked(zipName, dirName, info.getFileName()));
+
+                contents.add(info);
+                //printf("FOUND: file '%s'\n", (const char*) info.mFileName);
+            } else {
+                /* this is a subdir; add it if we don't already have it*/
+                String8 subdirName(cp, nextSlash - cp);
+                size_t j;
+                size_t N = dirs.size();
+
+                for (j = 0; j < N; j++) {
+                    if (subdirName == dirs[j]) {
+                        break;
+                    }
+                }
+                if (j == N) {
+                    dirs.add(subdirName);
+                }
+
+                //printf("FOUND: dir '%s'\n", (const char*) subdirName);
+            }
+        }
+    }
+
+    /*
+     * Add the set of unique directories.
+     */
+    for (int i = 0; i < (int) dirs.size(); i++) {
+        info.set(dirs[i], kFileTypeDirectory);
+        info.setSourceName(
+            createZipSourceNameLocked(zipName, dirName, info.getFileName()));
+        contents.add(info);
+    }
+
+    mergeInfoLocked(pMergedInfo, &contents);
+
+    return true;
+}
+
+
+/*
+ * Merge two vectors of FileInfo.
+ *
+ * The merged contents will be stuffed into *pMergedInfo.
+ *
+ * If an entry for a file exists in both "pMergedInfo" and "pContents",
+ * we use the newer "pContents" entry.
+ */
+void AssetManager::mergeInfoLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
+    const SortedVector<AssetDir::FileInfo>* pContents)
+{
+    /*
+     * Merge what we found in this directory with what we found in
+     * other places.
+     *
+     * Two basic approaches:
+     * (1) Create a new array that holds the unique values of the two
+     *     arrays.
+     * (2) Take the elements from pContents and shove them into pMergedInfo.
+     *
+     * Because these are vectors of complex objects, moving elements around
+     * inside the vector requires constructing new objects and allocating
+     * storage for members.  With approach #1, we're always adding to the
+     * end, whereas with #2 we could be inserting multiple elements at the
+     * front of the vector.  Approach #1 requires a full copy of the
+     * contents of pMergedInfo, but approach #2 requires the same copy for
+     * every insertion at the front of pMergedInfo.
+     *
+     * (We should probably use a SortedVector interface that allows us to
+     * just stuff items in, trusting us to maintain the sort order.)
+     */
+    SortedVector<AssetDir::FileInfo>* pNewSorted;
+    int mergeMax, contMax;
+    int mergeIdx, contIdx;
+
+    pNewSorted = new SortedVector<AssetDir::FileInfo>;
+    mergeMax = pMergedInfo->size();
+    contMax = pContents->size();
+    mergeIdx = contIdx = 0;
+
+    while (mergeIdx < mergeMax || contIdx < contMax) {
+        if (mergeIdx == mergeMax) {
+            /* hit end of "merge" list, copy rest of "contents" */
+            pNewSorted->add(pContents->itemAt(contIdx));
+            contIdx++;
+        } else if (contIdx == contMax) {
+            /* hit end of "cont" list, copy rest of "merge" */
+            pNewSorted->add(pMergedInfo->itemAt(mergeIdx));
+            mergeIdx++;
+        } else if (pMergedInfo->itemAt(mergeIdx) == pContents->itemAt(contIdx))
+        {
+            /* items are identical, add newer and advance both indices */
+            pNewSorted->add(pContents->itemAt(contIdx));
+            mergeIdx++;
+            contIdx++;
+        } else if (pMergedInfo->itemAt(mergeIdx) < pContents->itemAt(contIdx))
+        {
+            /* "merge" is lower, add that one */
+            pNewSorted->add(pMergedInfo->itemAt(mergeIdx));
+            mergeIdx++;
+        } else {
+            /* "cont" is lower, add that one */
+            assert(pContents->itemAt(contIdx) < pMergedInfo->itemAt(mergeIdx));
+            pNewSorted->add(pContents->itemAt(contIdx));
+            contIdx++;
+        }
+    }
+
+    /*
+     * Overwrite the "merged" list with the new stuff.
+     */
+    *pMergedInfo = *pNewSorted;
+    delete pNewSorted;
+
+#if 0       // for Vector, rather than SortedVector
+    int i, j;
+    for (i = pContents->size() -1; i >= 0; i--) {
+        bool add = true;
+
+        for (j = pMergedInfo->size() -1; j >= 0; j--) {
+            /* case-sensitive comparisons, to behave like UNIX fs */
+            if (strcmp(pContents->itemAt(i).mFileName,
+                       pMergedInfo->itemAt(j).mFileName) == 0)
+            {
+                /* match, don't add this entry */
+                add = false;
+                break;
+            }
+        }
+
+        if (add)
+            pMergedInfo->add(pContents->itemAt(i));
+    }
+#endif
+}
+
+
+/*
+ * Load all files into the file name cache.  We want to do this across
+ * all combinations of { appname, locale, vendor }, performing a recursive
+ * directory traversal.
+ *
+ * This is not the most efficient data structure.  Also, gathering the
+ * information as we needed it (file-by-file or directory-by-directory)
+ * would be faster.  However, on the actual device, 99% of the files will
+ * live in Zip archives, so this list will be very small.  The trouble
+ * is that we have to check the "loose" files first, so it's important
+ * that we don't beat the filesystem silly looking for files that aren't
+ * there.
+ *
+ * Note on thread safety: this is the only function that causes updates
+ * to mCache, and anybody who tries to use it will call here if !mCacheValid,
+ * so we need to employ a mutex here.
+ */
+void AssetManager::loadFileNameCacheLocked(void)
+{
+    assert(!mCacheValid);
+    assert(mCache.size() == 0);
+
+#ifdef DO_TIMINGS   // need to link against -lrt for this now
+    DurationTimer timer;
+    timer.start();
+#endif
+
+    fncScanLocked(&mCache, "");
+
+#ifdef DO_TIMINGS
+    timer.stop();
+    LOGD("Cache scan took %.3fms\n",
+        timer.durationUsecs() / 1000.0);
+#endif
+
+#if 0
+    int i;
+    printf("CACHED FILE LIST (%d entries):\n", mCache.size());
+    for (i = 0; i < (int) mCache.size(); i++) {
+        printf(" %d: (%d) '%s'\n", i,
+            mCache.itemAt(i).getFileType(),
+            (const char*) mCache.itemAt(i).getFileName());
+    }
+#endif
+
+    mCacheValid = true;
+}
+
+/*
+ * Scan up to 8 versions of the specified directory.
+ */
+void AssetManager::fncScanLocked(SortedVector<AssetDir::FileInfo>* pMergedInfo,
+    const char* dirName)
+{
+    size_t i = mAssetPaths.size();
+    while (i > 0) {
+        i--;
+        const asset_path& ap = mAssetPaths.itemAt(i);
+        fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, NULL, dirName);
+        if (mLocale != NULL)
+            fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, NULL, dirName);
+        if (mVendor != NULL)
+            fncScanAndMergeDirLocked(pMergedInfo, ap, NULL, mVendor, dirName);
+        if (mLocale != NULL && mVendor != NULL)
+            fncScanAndMergeDirLocked(pMergedInfo, ap, mLocale, mVendor, dirName);
+    }
+}
+
+/*
+ * Recursively scan this directory and all subdirs.
+ *
+ * This is similar to scanAndMergeDir, but we don't remove the .EXCLUDE
+ * files, and we prepend the extended partial path to the filenames.
+ */
+bool AssetManager::fncScanAndMergeDirLocked(
+    SortedVector<AssetDir::FileInfo>* pMergedInfo,
+    const asset_path& ap, const char* locale, const char* vendor,
+    const char* dirName)
+{
+    SortedVector<AssetDir::FileInfo>* pContents;
+    String8 partialPath;
+    String8 fullPath;
+
+    // XXX This is broken -- the filename cache needs to hold the base
+    // asset path separately from its filename.
+    
+    partialPath = createPathNameLocked(ap, locale, vendor);
+    if (dirName[0] != '\0') {
+        partialPath.appendPath(dirName);
+    }
+
+    fullPath = partialPath;
+    pContents = scanDirLocked(fullPath);
+    if (pContents == NULL) {
+        return false;       // directory did not exist
+    }
+
+    /*
+     * Scan all subdirectories of the current dir, merging what we find
+     * into "pMergedInfo".
+     */
+    for (int i = 0; i < (int) pContents->size(); i++) {
+        if (pContents->itemAt(i).getFileType() == kFileTypeDirectory) {
+            String8 subdir(dirName);
+            subdir.appendPath(pContents->itemAt(i).getFileName());
+
+            fncScanAndMergeDirLocked(pMergedInfo, ap, locale, vendor, subdir.string());
+        }
+    }
+
+    /*
+     * To be consistent, we want entries for the root directory.  If
+     * we're the root, add one now.
+     */
+    if (dirName[0] == '\0') {
+        AssetDir::FileInfo tmpInfo;
+
+        tmpInfo.set(String8(""), kFileTypeDirectory);
+        tmpInfo.setSourceName(createPathNameLocked(ap, locale, vendor));
+        pContents->add(tmpInfo);
+    }
+
+    /*
+     * We want to prepend the extended partial path to every entry in
+     * "pContents".  It's the same value for each entry, so this will
+     * not change the sorting order of the vector contents.
+     */
+    for (int i = 0; i < (int) pContents->size(); i++) {
+        const AssetDir::FileInfo& info = pContents->itemAt(i);
+        pContents->editItemAt(i).setFileName(partialPath.appendPathCopy(info.getFileName()));
+    }
+
+    mergeInfoLocked(pMergedInfo, pContents);
+    return true;
+}
+
+/*
+ * Trash the cache.
+ */
+void AssetManager::purgeFileNameCacheLocked(void)
+{
+    mCacheValid = false;
+    mCache.clear();
+}
+
+/*
+ * ===========================================================================
+ *      AssetManager::SharedZip
+ * ===========================================================================
+ */
+
+
+Mutex AssetManager::SharedZip::gLock;
+DefaultKeyedVector<String8, wp<AssetManager::SharedZip> > AssetManager::SharedZip::gOpen;
+
+AssetManager::SharedZip::SharedZip(const String8& path, time_t modWhen)
+    : mPath(path), mZipFile(NULL), mModWhen(modWhen), mResourceTableAsset(NULL)
+{
+    //LOGI("Creating SharedZip %p %s\n", this, (const char*)mPath);
+    mZipFile = new ZipFileRO;
+    LOGV("+++ opening zip '%s'\n", mPath.string());
+    if (mZipFile->open(mPath.string()) != NO_ERROR) {
+        LOGD("failed to open Zip archive '%s'\n", mPath.string());
+        delete mZipFile;
+        mZipFile = NULL;
+    }
+}
+
+sp<AssetManager::SharedZip> AssetManager::SharedZip::get(const String8& path)
+{
+    AutoMutex _l(gLock);
+    time_t modWhen = getFileModDate(path);
+    sp<SharedZip> zip = gOpen.valueFor(path).promote();
+    if (zip != NULL && zip->mModWhen == modWhen) {
+        return zip;
+    }
+    zip = new SharedZip(path, modWhen);
+    gOpen.add(path, zip);
+    return zip;
+
+}
+
+ZipFileRO* AssetManager::SharedZip::getZip()
+{
+    return mZipFile;
+}
+
+Asset* AssetManager::SharedZip::getResourceTableAsset()
+{
+    LOGV("Getting from SharedZip %p resource asset %p\n", this, mResourceTableAsset);
+    return mResourceTableAsset;
+}
+
+Asset* AssetManager::SharedZip::setResourceTableAsset(Asset* asset)
+{
+    {
+        AutoMutex _l(gLock);
+        if (mResourceTableAsset == NULL) {
+            mResourceTableAsset = asset;
+            // This is not thread safe the first time it is called, so
+            // do it here with the global lock held.
+            asset->getBuffer(true);
+            return asset;
+        }
+    }
+    delete asset;
+    return mResourceTableAsset;
+}
+
+bool AssetManager::SharedZip::isUpToDate()
+{
+    time_t modWhen = getFileModDate(mPath.string());
+    return mModWhen == modWhen;
+}
+
+AssetManager::SharedZip::~SharedZip()
+{
+    //LOGI("Destroying SharedZip %p %s\n", this, (const char*)mPath);
+    if (mResourceTableAsset != NULL) {
+        delete mResourceTableAsset;
+    }
+    if (mZipFile != NULL) {
+        delete mZipFile;
+        LOGV("Closed '%s'\n", mPath.string());
+    }
+}
+
+/*
+ * ===========================================================================
+ *      AssetManager::ZipSet
+ * ===========================================================================
+ */
+
+/*
+ * Constructor.
+ */
+AssetManager::ZipSet::ZipSet(void)
+{
+}
+
+/*
+ * Destructor.  Close any open archives.
+ */
+AssetManager::ZipSet::~ZipSet(void)
+{
+    size_t N = mZipFile.size();
+    for (size_t i = 0; i < N; i++)
+        closeZip(i);
+}
+
+/*
+ * Close a Zip file and reset the entry.
+ */
+void AssetManager::ZipSet::closeZip(int idx)
+{
+    mZipFile.editItemAt(idx) = NULL;
+}
+
+
+/*
+ * Retrieve the appropriate Zip file from the set.
+ */
+ZipFileRO* AssetManager::ZipSet::getZip(const String8& path)
+{
+    int idx = getIndex(path);
+    sp<SharedZip> zip = mZipFile[idx];
+    if (zip == NULL) {
+        zip = SharedZip::get(path);
+        mZipFile.editItemAt(idx) = zip;
+    }
+    return zip->getZip();
+}
+
+Asset* AssetManager::ZipSet::getZipResourceTable(const String8& path)
+{
+    int idx = getIndex(path);
+    sp<SharedZip> zip = mZipFile[idx];
+    if (zip == NULL) {
+        zip = SharedZip::get(path);
+        mZipFile.editItemAt(idx) = zip;
+    }
+    return zip->getResourceTableAsset();
+}
+
+Asset* AssetManager::ZipSet::setZipResourceTable(const String8& path,
+                                                 Asset* asset)
+{
+    int idx = getIndex(path);
+    sp<SharedZip> zip = mZipFile[idx];
+    // doesn't make sense to call before previously accessing.
+    return zip->setResourceTableAsset(asset);
+}
+
+/*
+ * Generate the partial pathname for the specified archive.  The caller
+ * gets to prepend the asset root directory.
+ *
+ * Returns something like "common/en-US-noogle.jar".
+ */
+/*static*/ String8 AssetManager::ZipSet::getPathName(const char* zipPath)
+{
+    return String8(zipPath);
+}
+
+bool AssetManager::ZipSet::isUpToDate()
+{
+    const size_t N = mZipFile.size();
+    for (size_t i=0; i<N; i++) {
+        if (mZipFile[i] != NULL && !mZipFile[i]->isUpToDate()) {
+            return false;
+        }
+    }
+    return true;
+}
+
+/*
+ * Compute the zip file's index.
+ *
+ * "appName", "locale", and "vendor" should be set to NULL to indicate the
+ * default directory.
+ */
+int AssetManager::ZipSet::getIndex(const String8& zip) const
+{
+    const size_t N = mZipPath.size();
+    for (size_t i=0; i<N; i++) {
+        if (mZipPath[i] == zip) {
+            return i;
+        }
+    }
+
+    mZipPath.add(zip);
+    mZipFile.add(NULL);
+
+    return mZipPath.size()-1;
+}
+