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gerrit-public.fairphone.software / platform / frameworks / base / 6706888e24aee04c2c914c44e5ef5b1510cf8013 / . / libs / androidfw / AssetManager.cpp
blob: 503c0306d18f8dbb28bb206c19c39995abadef0d [file] [log] [blame]
/*
* 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 ATRACE_TAG ATRACE_TAG_RESOURCES
//#define LOG_NDEBUG 0
#include <androidfw/Asset.h>
#include <androidfw/AssetDir.h>
#include <androidfw/AssetManager.h>
#include <androidfw/misc.h>
#include <androidfw/ResourceTypes.h>
#include <androidfw/ZipFileRO.h>
#include <utils/Atomic.h>
#include <utils/Log.h>
#include <utils/String8.h>
#include <utils/String8.h>
#include <utils/threads.h>
#include <utils/Timers.h>
#ifdef HAVE_ANDROID_OS
#include <cutils/trace.h>
#endif
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <strings.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
#ifdef HAVE_ANDROID_OS
#define MY_TRACE_BEGIN(x) ATRACE_BEGIN(x)
#define MY_TRACE_END() ATRACE_END()
#else
#define MY_TRACE_BEGIN(x)
#define MY_TRACE_END()
#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;
}
/*
* Like strdup(), but uses C++ "new" operator instead of malloc.
*/
static char* strdupNew(const char* str)
{
char* newStr;
int len;
if (str == NULL)
return NULL;
len = strlen(str);
newStr = new char[len+1];
memcpy(newStr, str, len+1);
return newStr;
}
}
/*
* ===========================================================================
* 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;
//ALOGI("Creating AssetManager %p #%d\n", this, count);
memset(mConfig, 0, sizeof(ResTable_config));
}
AssetManager::~AssetManager(void)
{
int count = android_atomic_dec(&gCount);
//ALOGI("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) {
ALOGW("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;
}
}
ALOGV("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 {
ALOGW("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 {
ALOGW("failed to stat file %s: %s\n", idmapPath.string(), strerror(errno));
return false;
}
}
if (st.st_size < ResTable::IDMAP_HEADER_SIZE_BYTES) {
ALOGW("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) {
ALOGW("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;
}
const bool gotInfo = zip->getEntryInfo(entry, NULL, NULL, NULL, NULL, NULL, (long*)pCrc);
zip->releaseEntry(entry);
return gotInfo;
}
bool AssetManager::createIdmapFileLocked(const String8& originalPath, const String8& overlayPath,
const String8& idmapPath)
{
ALOGD("%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) {
ALOGW("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)) {
ALOGW("failed to retrieve crc for resources.arsc in %s\n", originalPath.string());
goto error;
}
if (!getZipEntryCrcLocked(overlayPath, "resources.arsc", &overlayCrc)) {
ALOGW("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) {
ALOGW("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) {
ALOGW("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) {
ALOGW("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--;
ALOGV("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--;
ALOGV("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()) {
ALOGV("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);
MY_TRACE_BEGIN(ap.path.string());
Asset* idmap = openIdmapLocked(ap);
ALOGV("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) {
ALOGV("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.
ALOGV("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 {
ALOGV("loading resource table %s\n", ap.path.string());
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();
}
ALOGV("Installing resource asset %p in to table %p\n", ass, mResources);
if (sharedRes != NULL) {
ALOGV("Copying existing resources for %s", ap.path.string());
rt->add(sharedRes);
} else {
ALOGV("Parsing resources for %s", ap.path.string());
rt->add(ass, (void*)(i+1), !shared, idmap);
}
if (!shared) {
delete ass;
}
}
if (idmap != NULL) {
delete idmap;
}
MY_TRACE_END();
}
if (required && !rt) ALOGW("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) {
ALOGV("loading idmap %s\n", ap.idmap.string());
} else {
ALOGW("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 = getZipFileLocked(ap);
if (pZip != NULL) {
//printf("GOT zip, checking NA '%s'\n", (const char*) path);
ZipEntryRO 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);
pZip->releaseEntry(entry);
}
}
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)
ALOGD("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 = getZipFileLocked(ap);
if (pZip != NULL) {
//printf("GOT zip, checking '%s'\n", (const char*) path);
ZipEntryRO 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);
pZip->releaseEntry(entry);
}
}
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)
{
ALOGV("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;
size_t 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))
{
ALOGW("getEntryInfo failed\n");
return NULL;
}
FileMap* dataMap = pZipFile->createEntryFileMap(entry);
if (dataMap == NULL) {
ALOGW("create map from entry failed\n");
return NULL;
}
if (method == ZipFileRO::kCompressStored) {
pAsset = Asset::createFromUncompressedMap(dataMap, mode);
ALOGV("Opened uncompressed entry %s in zip %s mode %d: %p", entryName.string(),
dataMap->getFileName(), mode, pAsset);
} else {
pAsset = Asset::createFromCompressedMap(dataMap, method,
uncompressedLen, mode);
ALOGV("Opened compressed entry %s in zip %s mode %d: %p", entryName.string(),
dataMap->getFileName(), mode, pAsset);
}
if (pAsset == NULL) {
/* unexpected */
ALOGW("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) {
ALOGV("Adding directory %s from zip %s", dirName, ap.path.string());
scanAndMergeZipLocked(pMergedInfo, ap, kAssetsRoot, dirName);
} else {
ALOGV("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;
}
/*
* Open a directory in the non-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::openNonAssetDir(void* cookie, 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;
pMergedInfo = new SortedVector<AssetDir::FileInfo>;
const size_t which = ((size_t)cookie)-1;
if (which < mAssetPaths.size()) {
const asset_path& ap = mAssetPaths.itemAt(which);
if (ap.type == kFileTypeRegular) {
ALOGV("Adding directory %s from zip %s", dirName, ap.path.string());
scanAndMergeZipLocked(pMergedInfo, ap, NULL, dirName);
} else {
ALOGV("Adding directory %s from dir %s", dirName, ap.path.string());
scanAndMergeDirLocked(pMergedInfo, ap, NULL, 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) {
ALOGV("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);
}
ALOGD("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;
ALOGV("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) {
ALOGW("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();
void *iterationCookie;
if (!pZip->startIteration(&iterationCookie)) {
ALOGW("ZipFileRO::startIteration returned false");
return false;
}
ZipEntryRO entry;
while ((entry = pZip->nextEntry(iterationCookie)) != NULL) {
char nameBuf[256];
if (pZip->getEntryFileName(entry, nameBuf, sizeof(nameBuf)) != 0) {
// TODO: fix this if we expect to have long names
ALOGE("ARGH: name too long?\n");
continue;
}
//printf("Comparing %s in %s?\n", nameBuf, dirName.string());
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", info.getFileName().string());
} 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", subdirName.string());
}
}
}
pZip->endIteration(iterationCookie);
/*
* 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();
ALOGD("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), mResourceTable(NULL)
{
//ALOGI("Creating SharedZip %p %s\n", this, (const char*)mPath);
ALOGV("+++ opening zip '%s'\n", mPath.string());
mZipFile = ZipFileRO::open(mPath.string());
if (mZipFile == NULL) {
ALOGD("failed to open Zip archive '%s'\n", mPath.string());
}
}
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()
{
ALOGV("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;
}
ResTable* AssetManager::SharedZip::getResourceTable()
{
ALOGV("Getting from SharedZip %p resource table %p\n", this, mResourceTable);
return mResourceTable;
}
ResTable* AssetManager::SharedZip::setResourceTable(ResTable* res)
{
{
AutoMutex _l(gLock);
if (mResourceTable == NULL) {
mResourceTable = res;
return res;
}
}
delete res;
return mResourceTable;
}
bool AssetManager::SharedZip::isUpToDate()
{
time_t modWhen = getFileModDate(mPath.string());
return mModWhen == modWhen;
}
AssetManager::SharedZip::~SharedZip()
{
//ALOGI("Destroying SharedZip %p %s\n", this, (const char*)mPath);
if (mResourceTable != NULL) {
delete mResourceTable;
}
if (mResourceTableAsset != NULL) {
delete mResourceTableAsset;
}
if (mZipFile != NULL) {
delete mZipFile;
ALOGV("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::getZipResourceTableAsset(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::setZipResourceTableAsset(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);
}
ResTable* 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->getResourceTable();
}
ResTable* AssetManager::ZipSet::setZipResourceTable(const String8& path,
ResTable* res)
{
int idx = getIndex(path);
sp<SharedZip> zip = mZipFile[idx];
// doesn't make sense to call before previously accessing.
return zip->setResourceTable(res);
}
/*
* 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;
}