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AssetManager.cpp
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AssetManager.cpp
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/*
* 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>
#include <strings.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef TEMP_FAILURE_RETRY
/* Used to retry syscalls that can return EINTR. */
#define TEMP_FAILURE_RETRY(exp) ({ \
typeof (exp) _rc; \
do { \
_rc = (exp); \
} while (_rc == -1 && errno == EINTR); \
_rc; })
#endif
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* kIdmapCacheDir = "resource-cache";
static const char* kExcludeExtension = ".EXCLUDE";
static Asset* const kExcludedAsset = (Asset*) 0xd000000d;
static volatile int32_t gCount = 0;
namespace {
// Transform string /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap
String8 idmapPathForPackagePath(const String8& pkgPath)
{
const char* root = getenv("ANDROID_DATA");
LOG_ALWAYS_FATAL_IF(root == NULL, "ANDROID_DATA not set");
String8 path(root);
path.appendPath(kIdmapCacheDir);
char buf[256]; // 256 chars should be enough for anyone...
strncpy(buf, pkgPath.string(), 255);
buf[255] = '\0';
char* filename = buf;
while (*filename && *filename == '/') {
++filename;
}
char* p = filename;
while (*p) {
if (*p == '/') {
*p = '@';
}
++p;
}
path.appendPath(filename);
path.append("@idmap");
return path;
}
}
/*
* ===========================================================================
* 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();
}
// add overlay packages for /system/framework; apps are handled by the
// (Java) package manager
if (strncmp(path.string(), "/system/framework/", 18) == 0) {
// When there is an environment variable for /vendor, this
// should be changed to something similar to how ANDROID_ROOT
// and ANDROID_DATA are used in this file.
String8 overlayPath("/vendor/overlay/framework/");
overlayPath.append(path.getPathLeaf());
if (TEMP_FAILURE_RETRY(access(overlayPath.string(), R_OK)) == 0) {
asset_path oap;
oap.path = overlayPath;
oap.type = ::getFileType(overlayPath.string());
bool addOverlay = (oap.type == kFileTypeRegular); // only .apks supported as overlay
if (addOverlay) {
oap.idmap = idmapPathForPackagePath(overlayPath);
if (isIdmapStaleLocked(ap.path, oap.path, oap.idmap)) {
addOverlay = createIdmapFileLocked(ap.path, oap.path, oap.idmap);
}
}
if (addOverlay) {
mAssetPaths.add(oap);
} else {
LOGW("failed to add overlay package %s\n", overlayPath.string());
}
}
}
return true;
}
bool AssetManager::isIdmapStaleLocked(const String8& originalPath, const String8& overlayPath,
const String8& idmapPath)
{
struct stat st;
if (TEMP_FAILURE_RETRY(stat(idmapPath.string(), &st)) == -1) {
if (errno == ENOENT) {
return true; // non-existing idmap is always stale
} else {
LOGW("failed to stat file %s: %s\n", idmapPath.string(), strerror(errno));
return false;
}
}
if (st.st_size < ResTable::IDMAP_HEADER_SIZE_BYTES) {
LOGW("file %s has unexpectedly small size=%zd\n", idmapPath.string(), (size_t)st.st_size);
return false;
}
int fd = TEMP_FAILURE_RETRY(::open(idmapPath.string(), O_RDONLY));
if (fd == -1) {
LOGW("failed to open file %s: %s\n", idmapPath.string(), strerror(errno));
return false;
}
char buf[ResTable::IDMAP_HEADER_SIZE_BYTES];
ssize_t bytesLeft = ResTable::IDMAP_HEADER_SIZE_BYTES;
for (;;) {
ssize_t r = TEMP_FAILURE_RETRY(read(fd, buf + ResTable::IDMAP_HEADER_SIZE_BYTES - bytesLeft,
bytesLeft));
if (r < 0) {
TEMP_FAILURE_RETRY(close(fd));
return false;
}
bytesLeft -= r;
if (bytesLeft == 0) {
break;
}
}
TEMP_FAILURE_RETRY(close(fd));
uint32_t cachedOriginalCrc, cachedOverlayCrc;
if (!ResTable::getIdmapInfo(buf, ResTable::IDMAP_HEADER_SIZE_BYTES,
&cachedOriginalCrc, &cachedOverlayCrc)) {
return false;
}
uint32_t actualOriginalCrc, actualOverlayCrc;
if (!getZipEntryCrcLocked(originalPath, "resources.arsc", &actualOriginalCrc)) {
return false;
}
if (!getZipEntryCrcLocked(overlayPath, "resources.arsc", &actualOverlayCrc)) {
return false;
}
return cachedOriginalCrc != actualOriginalCrc || cachedOverlayCrc != actualOverlayCrc;
}
bool AssetManager::getZipEntryCrcLocked(const String8& zipPath, const char* entryFilename,
uint32_t* pCrc)
{
asset_path ap;
ap.path = zipPath;
const ZipFileRO* zip = getZipFileLocked(ap);
if (zip == NULL) {
return false;
}
const ZipEntryRO entry = zip->findEntryByName(entryFilename);
if (entry == NULL) {
return false;
}
if (!zip->getEntryInfo(entry, NULL, NULL, NULL, NULL, NULL, (long*)pCrc)) {
return false;
}
return true;
}
bool AssetManager::createIdmapFileLocked(const String8& originalPath, const String8& overlayPath,
const String8& idmapPath)
{
LOGD("%s: originalPath=%s overlayPath=%s idmapPath=%s\n",
__FUNCTION__, originalPath.string(), overlayPath.string(), idmapPath.string());
ResTable tables[2];
const String8* paths[2] = { &originalPath, &overlayPath };
uint32_t originalCrc, overlayCrc;
bool retval = false;
ssize_t offset = 0;
int fd = 0;
uint32_t* data = NULL;
size_t size;
for (int i = 0; i < 2; ++i) {
asset_path ap;
ap.type = kFileTypeRegular;
ap.path = *paths[i];
Asset* ass = openNonAssetInPathLocked("resources.arsc", Asset::ACCESS_BUFFER, ap);
if (ass == NULL) {
LOGW("failed to find resources.arsc in %s\n", ap.path.string());
goto error;
}
tables[i].add(ass, (void*)1, false);
}
if (!getZipEntryCrcLocked(originalPath, "resources.arsc", &originalCrc)) {
LOGW("failed to retrieve crc for resources.arsc in %s\n", originalPath.string());
goto error;
}
if (!getZipEntryCrcLocked(overlayPath, "resources.arsc", &overlayCrc)) {
LOGW("failed to retrieve crc for resources.arsc in %s\n", overlayPath.string());
goto error;
}
if (tables[0].createIdmap(tables[1], originalCrc, overlayCrc,
(void**)&data, &size) != NO_ERROR) {
LOGW("failed to generate idmap data for file %s\n", idmapPath.string());
goto error;
}
// This should be abstracted (eg replaced by a stand-alone
// application like dexopt, triggered by something equivalent to
// installd).
fd = TEMP_FAILURE_RETRY(::open(idmapPath.string(), O_WRONLY | O_CREAT | O_TRUNC, 0644));
if (fd == -1) {
LOGW("failed to write idmap file %s (open: %s)\n", idmapPath.string(), strerror(errno));
goto error_free;
}
for (;;) {
ssize_t written = TEMP_FAILURE_RETRY(write(fd, data + offset, size));
if (written < 0) {
LOGW("failed to write idmap file %s (write: %s)\n", idmapPath.string(),
strerror(errno));
goto error_close;
}
size -= (size_t)written;
offset += written;
if (size == 0) {
break;
}
}
retval = true;
error_close:
TEMP_FAILURE_RETRY(close(fd));
error_free:
free(data);
error:
return retval;
}
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();
}
}
void AssetManager::getConfiguration(ResTable_config* outConfig) const
{
AutoMutex _l(mLock);
*outConfig = *mConfig;
}
/*
* 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;
ResTable* sharedRes = NULL;
bool shared = true;
const asset_path& ap = mAssetPaths.itemAt(i);
Asset* idmap = openIdmapLocked(ap);
LOGV("Looking for resource asset in '%s'\n", ap.path.string());
if (ap.type != kFileTypeDirectory) {
if (i == 0) {
// The first item is typically the framework resources,
// which we want to avoid parsing every time.
sharedRes = const_cast<AssetManager*>(this)->
mZipSet.getZipResourceTable(ap.path);
}
if (sharedRes == NULL) {
ass = const_cast<AssetManager*>(this)->
mZipSet.getZipResourceTableAsset(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.setZipResourceTableAsset(ap.path, ass);
}
}
if (i == 0 && ass != NULL) {
// If this is the first resource table in the asset
// manager, then we are going to cache it so that we
// can quickly copy it out for others.
LOGV("Creating shared resources for %s", ap.path.string());
sharedRes = new ResTable();
sharedRes->add(ass, (void*)(i+1), false, idmap);
sharedRes = const_cast<AssetManager*>(this)->
mZipSet.setZipResourceTable(ap.path, sharedRes);
}
}
} 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 || sharedRes != NULL) && ass != kExcludedAsset) {
if (rt == NULL) {
mResources = rt = new ResTable();
updateResourceParamsLocked();
}
LOGV("Installing resource asset %p in to table %p\n", ass, mResources);
if (sharedRes != NULL) {
LOGV("Copying existing resources for %s", ap.path.string());
rt->add(sharedRes);
} else {
LOGV("Parsing resources for %s", ap.path.string());
rt->add(ass, (void*)(i+1), !shared, idmap);
}
if (!shared) {
delete ass;
}
}
if (idmap != NULL) {
delete idmap;
}
}
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);
}
Asset* AssetManager::openIdmapLocked(const struct asset_path& ap) const
{
Asset* ass = NULL;
if (ap.idmap.size() != 0) {
ass = const_cast<AssetManager*>(this)->
openAssetFromFileLocked(ap.idmap, Asset::ACCESS_BUFFER);
if (ass) {
LOGV("loading idmap %s\n", ap.idmap.string());
} else {
LOGW("failed to load idmap %s\n", ap.idmap.string());
}
}
return ass;
}
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)