core/jni/android_util_AssetManager.cpp

/* //device/libs/android_runtime/android_util_AssetManager.cpp
**
** Copyright 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.
*/

#define LOG_TAG "asset"

#include <android_runtime/android_util_AssetManager.h>

#include <inttypes.h>
#include <linux/capability.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/system_properties.h>

#include <private/android_filesystem_config.h> // for AID_SYSTEM

#include "androidfw/Asset.h"
#include "androidfw/AssetManager.h"
#include "androidfw/AttributeResolution.h"
#include "androidfw/ResourceTypes.h"
#include "android_runtime/AndroidRuntime.h"
#include "android_util_Binder.h"
#include "core_jni_helpers.h"
#include "jni.h"
#include <nativehelper/JNIHelp.h>
#include <nativehelper/ScopedStringChars.h>
#include <nativehelper/ScopedUtfChars.h>
#include "utils/Log.h"
#include "utils/misc.h"
#include "utils/String8.h"

extern "C" int capget(cap_user_header_t hdrp, cap_user_data_t datap);
extern "C" int capset(cap_user_header_t hdrp, const cap_user_data_t datap);


namespace android {

static const bool kThrowOnBadId = false;

// ----------------------------------------------------------------------------

static struct typedvalue_offsets_t
{
    jfieldID mType;
    jfieldID mData;
    jfieldID mString;
    jfieldID mAssetCookie;
    jfieldID mResourceId;
    jfieldID mChangingConfigurations;
    jfieldID mDensity;
} gTypedValueOffsets;

static struct assetfiledescriptor_offsets_t
{
    jfieldID mFd;
    jfieldID mStartOffset;
    jfieldID mLength;
} gAssetFileDescriptorOffsets;

static struct assetmanager_offsets_t
{
    jfieldID mObject;
} gAssetManagerOffsets;

static struct sparsearray_offsets_t
{
    jclass classObject;
    jmethodID constructor;
    jmethodID put;
} gSparseArrayOffsets;

static struct configuration_offsets_t
{
    jclass classObject;
    jmethodID constructor;
    jfieldID mSmallestScreenWidthDpOffset;
    jfieldID mScreenWidthDpOffset;
    jfieldID mScreenHeightDpOffset;
} gConfigurationOffsets;

jclass g_stringClass = NULL;

// ----------------------------------------------------------------------------

static jint copyValue(JNIEnv* env, jobject outValue, const ResTable* table,
                      const Res_value& value, uint32_t ref, ssize_t block,
                      uint32_t typeSpecFlags, ResTable_config* config = NULL);

jint copyValue(JNIEnv* env, jobject outValue, const ResTable* table,
               const Res_value& value, uint32_t ref, ssize_t block,
               uint32_t typeSpecFlags, ResTable_config* config)
{
    env->SetIntField(outValue, gTypedValueOffsets.mType, value.dataType);
    env->SetIntField(outValue, gTypedValueOffsets.mAssetCookie,
                     static_cast<jint>(table->getTableCookie(block)));
    env->SetIntField(outValue, gTypedValueOffsets.mData, value.data);
    env->SetObjectField(outValue, gTypedValueOffsets.mString, NULL);
    env->SetIntField(outValue, gTypedValueOffsets.mResourceId, ref);
    env->SetIntField(outValue, gTypedValueOffsets.mChangingConfigurations,
            typeSpecFlags);
    if (config != NULL) {
        env->SetIntField(outValue, gTypedValueOffsets.mDensity, config->density);
    }
    return block;
}

// This is called by zygote (running as user root) as part of preloadResources.
static void verifySystemIdmaps()
{
    pid_t pid;
    char system_id[10];

    snprintf(system_id, sizeof(system_id), "%d", AID_SYSTEM);

    switch (pid = fork()) {
        case -1:
            ALOGE("failed to fork for idmap: %s", strerror(errno));
            break;
        case 0: // child
            {
                struct __user_cap_header_struct capheader;
                struct __user_cap_data_struct capdata;

                memset(&capheader, 0, sizeof(capheader));
                memset(&capdata, 0, sizeof(capdata));

                capheader.version = _LINUX_CAPABILITY_VERSION;
                capheader.pid = 0;

                if (capget(&capheader, &capdata) != 0) {
                    ALOGE("capget: %s\n", strerror(errno));
                    exit(1);
                }

                capdata.effective = capdata.permitted;
                if (capset(&capheader, &capdata) != 0) {
                    ALOGE("capset: %s\n", strerror(errno));
                    exit(1);
                }

                if (setgid(AID_SYSTEM) != 0) {
                    ALOGE("setgid: %s\n", strerror(errno));
                    exit(1);
                }

                if (setuid(AID_SYSTEM) != 0) {
                    ALOGE("setuid: %s\n", strerror(errno));
                    exit(1);
                }

                // Generic idmap parameters
                const char* argv[8];
                int argc = 0;
                struct stat st;

                memset(argv, NULL, sizeof(argv));
                argv[argc++] = AssetManager::IDMAP_BIN;
                argv[argc++] = "--scan";
                argv[argc++] = AssetManager::TARGET_PACKAGE_NAME;
                argv[argc++] = AssetManager::TARGET_APK_PATH;
                argv[argc++] = AssetManager::IDMAP_DIR;

                // Directories to scan for overlays: if OVERLAY_THEME_DIR_PROPERTY is defined,
                // use OVERLAY_DIR/<value of OVERLAY_THEME_DIR_PROPERTY> in addition to OVERLAY_DIR.
                char subdir[PROP_VALUE_MAX];
                int len = __system_property_get(AssetManager::OVERLAY_THEME_DIR_PROPERTY, subdir);
                if (len > 0) {
                    String8 overlayPath = String8(AssetManager::OVERLAY_DIR) + "/" + subdir;
                    if (stat(overlayPath.string(), &st) == 0) {
                        argv[argc++] = overlayPath.string();
                    }
                }
                if (stat(AssetManager::OVERLAY_DIR, &st) == 0) {
                    argv[argc++] = AssetManager::OVERLAY_DIR;
                }

                if (stat(AssetManager::PRODUCT_OVERLAY_DIR, &st) == 0) {
                    argv[argc++] = AssetManager::PRODUCT_OVERLAY_DIR;
                }

                // Finally, invoke idmap (if any overlay directory exists)
                if (argc > 5) {
                    execv(AssetManager::IDMAP_BIN, (char* const*)argv);
                    ALOGE("failed to execv for idmap: %s", strerror(errno));
                    exit(1); // should never get here
                } else {
                    exit(0);
                }
            }
            break;
        default: // parent
            waitpid(pid, NULL, 0);
            break;
    }
}


// ----------------------------------------------------------------------------

// this guy is exported to other jni routines
AssetManager* assetManagerForJavaObject(JNIEnv* env, jobject obj)
{
    jlong amHandle = env->GetLongField(obj, gAssetManagerOffsets.mObject);
    AssetManager* am = reinterpret_cast<AssetManager*>(amHandle);
    if (am != NULL) {
        return am;
    }
    jniThrowException(env, "java/lang/IllegalStateException", "AssetManager has been finalized!");
    return NULL;
}

static jlong android_content_AssetManager_openAsset(JNIEnv* env, jobject clazz,
                                                jstring fileName, jint mode)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    ALOGV("openAsset in %p (Java object %p)\n", am, clazz);

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        jniThrowException(env, "java/lang/IllegalArgumentException", "Empty file name");
        return -1;
    }

    if (mode != Asset::ACCESS_UNKNOWN && mode != Asset::ACCESS_RANDOM
        && mode != Asset::ACCESS_STREAMING && mode != Asset::ACCESS_BUFFER) {
        jniThrowException(env, "java/lang/IllegalArgumentException", "Bad access mode");
        return -1;
    }

    Asset* a = am->open(fileName8.c_str(), (Asset::AccessMode)mode);

    if (a == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return -1;
    }

    //printf("Created Asset Stream: %p\n", a);

    return reinterpret_cast<jlong>(a);
}

static jobject returnParcelFileDescriptor(JNIEnv* env, Asset* a, jlongArray outOffsets)
{
    off64_t startOffset, length;
    int fd = a->openFileDescriptor(&startOffset, &length);
    delete a;

    if (fd < 0) {
        jniThrowException(env, "java/io/FileNotFoundException",
                "This file can not be opened as a file descriptor; it is probably compressed");
        return NULL;
    }

    jlong* offsets = (jlong*)env->GetPrimitiveArrayCritical(outOffsets, 0);
    if (offsets == NULL) {
        close(fd);
        return NULL;
    }

    offsets[0] = startOffset;
    offsets[1] = length;

    env->ReleasePrimitiveArrayCritical(outOffsets, offsets, 0);

    jobject fileDesc = jniCreateFileDescriptor(env, fd);
    if (fileDesc == NULL) {
        close(fd);
        return NULL;
    }

    return newParcelFileDescriptor(env, fileDesc);
}

static jobject android_content_AssetManager_openAssetFd(JNIEnv* env, jobject clazz,
                                                jstring fileName, jlongArray outOffsets)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ALOGV("openAssetFd in %p (Java object %p)\n", am, clazz);

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        return NULL;
    }

    Asset* a = am->open(fileName8.c_str(), Asset::ACCESS_RANDOM);

    if (a == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return NULL;
    }

    //printf("Created Asset Stream: %p\n", a);

    return returnParcelFileDescriptor(env, a, outOffsets);
}

static jlong android_content_AssetManager_openNonAssetNative(JNIEnv* env, jobject clazz,
                                                         jint cookie,
                                                         jstring fileName,
                                                         jint mode)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    ALOGV("openNonAssetNative in %p (Java object %p)\n", am, clazz);

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        return -1;
    }

    if (mode != Asset::ACCESS_UNKNOWN && mode != Asset::ACCESS_RANDOM
        && mode != Asset::ACCESS_STREAMING && mode != Asset::ACCESS_BUFFER) {
        jniThrowException(env, "java/lang/IllegalArgumentException", "Bad access mode");
        return -1;
    }

    Asset* a = cookie
        ? am->openNonAsset(static_cast<int32_t>(cookie), fileName8.c_str(),
                (Asset::AccessMode)mode)
        : am->openNonAsset(fileName8.c_str(), (Asset::AccessMode)mode);

    if (a == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return -1;
    }

    //printf("Created Asset Stream: %p\n", a);

    return reinterpret_cast<jlong>(a);
}

static jobject android_content_AssetManager_openNonAssetFdNative(JNIEnv* env, jobject clazz,
                                                         jint cookie,
                                                         jstring fileName,
                                                         jlongArray outOffsets)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ALOGV("openNonAssetFd in %p (Java object %p)\n", am, clazz);

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        return NULL;
    }

    Asset* a = cookie
        ? am->openNonAsset(static_cast<int32_t>(cookie), fileName8.c_str(), Asset::ACCESS_RANDOM)
        : am->openNonAsset(fileName8.c_str(), Asset::ACCESS_RANDOM);

    if (a == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return NULL;
    }

    //printf("Created Asset Stream: %p\n", a);

    return returnParcelFileDescriptor(env, a, outOffsets);
}

static jobjectArray android_content_AssetManager_list(JNIEnv* env, jobject clazz,
                                                   jstring fileName)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        return NULL;
    }

    AssetDir* dir = am->openDir(fileName8.c_str());

    if (dir == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return NULL;
    }

    size_t N = dir->getFileCount();

    jobjectArray array = env->NewObjectArray(dir->getFileCount(),
                                                g_stringClass, NULL);
    if (array == NULL) {
        delete dir;
        return NULL;
    }

    for (size_t i=0; i<N; i++) {
        const String8& name = dir->getFileName(i);
        jstring str = env->NewStringUTF(name.string());
        if (str == NULL) {
            delete dir;
            return NULL;
        }
        env->SetObjectArrayElement(array, i, str);
        env->DeleteLocalRef(str);
    }

    delete dir;

    return array;
}

static void android_content_AssetManager_destroyAsset(JNIEnv* env, jobject clazz,
                                                      jlong assetHandle)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    //printf("Destroying Asset Stream: %p\n", a);

    if (a == NULL) {
        jniThrowNullPointerException(env, "asset");
        return;
    }

    delete a;
}

static jint android_content_AssetManager_readAssetChar(JNIEnv* env, jobject clazz,
                                                       jlong assetHandle)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    if (a == NULL) {
        jniThrowNullPointerException(env, "asset");
        return -1;
    }

    uint8_t b;
    ssize_t res = a->read(&b, 1);
    return res == 1 ? b : -1;
}

static jint android_content_AssetManager_readAsset(JNIEnv* env, jobject clazz,
                                                jlong assetHandle, jbyteArray bArray,
                                                jint off, jint len)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    if (a == NULL || bArray == NULL) {
        jniThrowNullPointerException(env, "asset");
        return -1;
    }

    if (len == 0) {
        return 0;
    }

    jsize bLen = env->GetArrayLength(bArray);
    if (off < 0 || off >= bLen || len < 0 || len > bLen || (off+len) > bLen) {
        jniThrowException(env, "java/lang/IndexOutOfBoundsException", "");
        return -1;
    }

    jbyte* b = env->GetByteArrayElements(bArray, NULL);
    ssize_t res = a->read(b+off, len);
    env->ReleaseByteArrayElements(bArray, b, 0);

    if (res > 0) return static_cast<jint>(res);

    if (res < 0) {
        jniThrowException(env, "java/io/IOException", "");
    }
    return -1;
}

static jlong android_content_AssetManager_seekAsset(JNIEnv* env, jobject clazz,
                                                 jlong assetHandle,
                                                 jlong offset, jint whence)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    if (a == NULL) {
        jniThrowNullPointerException(env, "asset");
        return -1;
    }

    return a->seek(
        offset, (whence > 0) ? SEEK_END : (whence < 0 ? SEEK_SET : SEEK_CUR));
}

static jlong android_content_AssetManager_getAssetLength(JNIEnv* env, jobject clazz,
                                                      jlong assetHandle)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    if (a == NULL) {
        jniThrowNullPointerException(env, "asset");
        return -1;
    }

    return a->getLength();
}

static jlong android_content_AssetManager_getAssetRemainingLength(JNIEnv* env, jobject clazz,
                                                               jlong assetHandle)
{
    Asset* a = reinterpret_cast<Asset*>(assetHandle);

    if (a == NULL) {
        jniThrowNullPointerException(env, "asset");
        return -1;
    }

    return a->getRemainingLength();
}

static jint android_content_AssetManager_addAssetPath(JNIEnv* env, jobject clazz,
                                                       jstring path, jboolean appAsLib)
{
    ScopedUtfChars path8(env, path);
    if (path8.c_str() == NULL) {
        return 0;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    int32_t cookie;
    bool res = am->addAssetPath(String8(path8.c_str()), &cookie, appAsLib);

    return (res) ? static_cast<jint>(cookie) : 0;
}

static jint android_content_AssetManager_addOverlayPath(JNIEnv* env, jobject clazz,
                                                     jstring idmapPath)
{
    ScopedUtfChars idmapPath8(env, idmapPath);
    if (idmapPath8.c_str() == NULL) {
        return 0;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    int32_t cookie;
    bool res = am->addOverlayPath(String8(idmapPath8.c_str()), &cookie);

    return (res) ? (jint)cookie : 0;
}

static jint android_content_AssetManager_addAssetFd(JNIEnv* env, jobject clazz,
                                                    jobject fileDescriptor, jstring debugPathName,
                                                    jboolean appAsLib)
{
    ScopedUtfChars debugPathName8(env, debugPathName);

    int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
    if (fd < 0) {
        jniThrowException(env, "java/lang/IllegalArgumentException", "Bad FileDescriptor");
        return 0;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    int dupfd = ::dup(fd);
    if (dupfd < 0) {
        jniThrowIOException(env, errno);
        return 0;
    }

    int32_t cookie;
    bool res = am->addAssetFd(dupfd, String8(debugPathName8.c_str()), &cookie, appAsLib);

    return (res) ? static_cast<jint>(cookie) : 0;
}

static jboolean android_content_AssetManager_isUpToDate(JNIEnv* env, jobject clazz)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return JNI_TRUE;
    }
    return am->isUpToDate() ? JNI_TRUE : JNI_FALSE;
}

static jobjectArray getLocales(JNIEnv* env, jobject clazz, bool includeSystemLocales)
{
    Vector<String8> locales;

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    am->getLocales(&locales, includeSystemLocales);

    const int N = locales.size();

    jobjectArray result = env->NewObjectArray(N, g_stringClass, NULL);
    if (result == NULL) {
        return NULL;
    }

    for (int i=0; i<N; i++) {
        jstring str = env->NewStringUTF(locales[i].string());
        if (str == NULL) {
            return NULL;
        }
        env->SetObjectArrayElement(result, i, str);
        env->DeleteLocalRef(str);
    }

    return result;
}

static jobjectArray android_content_AssetManager_getLocales(JNIEnv* env, jobject clazz)
{
    return getLocales(env, clazz, true /* include system locales */);
}

static jobjectArray android_content_AssetManager_getNonSystemLocales(JNIEnv* env, jobject clazz)
{
    return getLocales(env, clazz, false /* don't include system locales */);
}

static jobject constructConfigurationObject(JNIEnv* env, const ResTable_config& config) {
    jobject result = env->NewObject(gConfigurationOffsets.classObject,
            gConfigurationOffsets.constructor);
    if (result == NULL) {
        return NULL;
    }

    env->SetIntField(result, gConfigurationOffsets.mSmallestScreenWidthDpOffset,
            config.smallestScreenWidthDp);
    env->SetIntField(result, gConfigurationOffsets.mScreenWidthDpOffset, config.screenWidthDp);
    env->SetIntField(result, gConfigurationOffsets.mScreenHeightDpOffset, config.screenHeightDp);

    return result;
}

static jobjectArray getSizeConfigurationsInternal(JNIEnv* env,
        const Vector<ResTable_config>& configs) {
    const int N = configs.size();
    jobjectArray result = env->NewObjectArray(N, gConfigurationOffsets.classObject, NULL);
    if (result == NULL) {
        return NULL;
    }

    for (int i=0; i<N; i++) {
        jobject config = constructConfigurationObject(env, configs[i]);
        if (config == NULL) {
            env->DeleteLocalRef(result);
            return NULL;
        }

        env->SetObjectArrayElement(result, i, config);
        env->DeleteLocalRef(config);
    }

    return result;
}

static jobjectArray android_content_AssetManager_getSizeConfigurations(JNIEnv* env, jobject clazz) {
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    const ResTable& res(am->getResources());
    Vector<ResTable_config> configs;
    res.getConfigurations(&configs, false /* ignoreMipmap */, true /* ignoreAndroidPackage */);

    return getSizeConfigurationsInternal(env, configs);
}

static void android_content_AssetManager_setConfiguration(JNIEnv* env, jobject clazz,
                                                          jint mcc, jint mnc,
                                                          jstring locale, jint orientation,
                                                          jint touchscreen, jint density,
                                                          jint keyboard, jint keyboardHidden,
                                                          jint navigation,
                                                          jint screenWidth, jint screenHeight,
                                                          jint smallestScreenWidthDp,
                                                          jint screenWidthDp, jint screenHeightDp,
                                                          jint screenLayout, jint uiMode,
                                                          jint colorMode, jint sdkVersion)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return;
    }

    ResTable_config config;
    memset(&config, 0, sizeof(config));

    const char* locale8 = locale != NULL ? env->GetStringUTFChars(locale, NULL) : NULL;

    // Constants duplicated from Java class android.content.res.Configuration.
    static const jint kScreenLayoutRoundMask = 0x300;
    static const jint kScreenLayoutRoundShift = 8;

    config.mcc = (uint16_t)mcc;
    config.mnc = (uint16_t)mnc;
    config.orientation = (uint8_t)orientation;
    config.touchscreen = (uint8_t)touchscreen;
    config.density = (uint16_t)density;
    config.keyboard = (uint8_t)keyboard;
    config.inputFlags = (uint8_t)keyboardHidden;
    config.navigation = (uint8_t)navigation;
    config.screenWidth = (uint16_t)screenWidth;
    config.screenHeight = (uint16_t)screenHeight;
    config.smallestScreenWidthDp = (uint16_t)smallestScreenWidthDp;
    config.screenWidthDp = (uint16_t)screenWidthDp;
    config.screenHeightDp = (uint16_t)screenHeightDp;
    config.screenLayout = (uint8_t)screenLayout;
    config.uiMode = (uint8_t)uiMode;
    config.colorMode = (uint8_t)colorMode;
    config.sdkVersion = (uint16_t)sdkVersion;
    config.minorVersion = 0;

    // In Java, we use a 32bit integer for screenLayout, while we only use an 8bit integer
    // in C++. We must extract the round qualifier out of the Java screenLayout and put it
    // into screenLayout2.
    config.screenLayout2 =
            (uint8_t)((screenLayout & kScreenLayoutRoundMask) >> kScreenLayoutRoundShift);

    am->setConfiguration(config, locale8);

    if (locale != NULL) env->ReleaseStringUTFChars(locale, locale8);
}

static jint android_content_AssetManager_getResourceIdentifier(JNIEnv* env, jobject clazz,
                                                            jstring name,
                                                            jstring defType,
                                                            jstring defPackage)
{
    ScopedStringChars name16(env, name);
    if (name16.get() == NULL) {
        return 0;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    const char16_t* defType16 = reinterpret_cast<const char16_t*>(defType)
        ? reinterpret_cast<const char16_t*>(env->GetStringChars(defType, NULL))
        : NULL;
    jsize defTypeLen = defType
        ? env->GetStringLength(defType) : 0;
    const char16_t* defPackage16 = reinterpret_cast<const char16_t*>(defPackage)
        ? reinterpret_cast<const char16_t*>(env->GetStringChars(defPackage,
                                                                NULL))
        : NULL;
    jsize defPackageLen = defPackage
        ? env->GetStringLength(defPackage) : 0;

    jint ident = am->getResources().identifierForName(
        reinterpret_cast<const char16_t*>(name16.get()), name16.size(),
        defType16, defTypeLen, defPackage16, defPackageLen);

    if (defPackage16) {
        env->ReleaseStringChars(defPackage,
                                reinterpret_cast<const jchar*>(defPackage16));
    }
    if (defType16) {
        env->ReleaseStringChars(defType,
                                reinterpret_cast<const jchar*>(defType16));
    }

    return ident;
}

static jstring android_content_AssetManager_getResourceName(JNIEnv* env, jobject clazz,
                                                            jint resid)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ResTable::resource_name name;
    if (!am->getResources().getResourceName(resid, true, &name)) {
        return NULL;
    }

    String16 str;
    if (name.package != NULL) {
        str.setTo(name.package, name.packageLen);
    }
    if (name.type8 != NULL || name.type != NULL) {
        if (str.size() > 0) {
            char16_t div = ':';
            str.append(&div, 1);
        }
        if (name.type8 != NULL) {
            str.append(String16(name.type8, name.typeLen));
        } else {
            str.append(name.type, name.typeLen);
        }
    }
    if (name.name8 != NULL || name.name != NULL) {
        if (str.size() > 0) {
            char16_t div = '/';
            str.append(&div, 1);
        }
        if (name.name8 != NULL) {
            str.append(String16(name.name8, name.nameLen));
        } else {
            str.append(name.name, name.nameLen);
        }
    }

    return env->NewString((const jchar*)str.string(), str.size());
}

static jstring android_content_AssetManager_getResourcePackageName(JNIEnv* env, jobject clazz,
                                                                   jint resid)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ResTable::resource_name name;
    if (!am->getResources().getResourceName(resid, true, &name)) {
        return NULL;
    }

    if (name.package != NULL) {
        return env->NewString((const jchar*)name.package, name.packageLen);
    }

    return NULL;
}

static jstring android_content_AssetManager_getResourceTypeName(JNIEnv* env, jobject clazz,
                                                                jint resid)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ResTable::resource_name name;
    if (!am->getResources().getResourceName(resid, true, &name)) {
        return NULL;
    }

    if (name.type8 != NULL) {
        return env->NewStringUTF(name.type8);
    }

    if (name.type != NULL) {
        return env->NewString((const jchar*)name.type, name.typeLen);
    }

    return NULL;
}

static jstring android_content_AssetManager_getResourceEntryName(JNIEnv* env, jobject clazz,
                                                                 jint resid)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }

    ResTable::resource_name name;
    if (!am->getResources().getResourceName(resid, true, &name)) {
        return NULL;
    }

    if (name.name8 != NULL) {
        return env->NewStringUTF(name.name8);
    }

    if (name.name != NULL) {
        return env->NewString((const jchar*)name.name, name.nameLen);
    }

    return NULL;
}

static jint android_content_AssetManager_loadResourceValue(JNIEnv* env, jobject clazz,
                                                           jint ident,
                                                           jshort density,
                                                           jobject outValue,
                                                           jboolean resolve)
{
    if (outValue == NULL) {
         jniThrowNullPointerException(env, "outValue");
         return 0;
    }
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    const ResTable& res(am->getResources());

    Res_value value;
    ResTable_config config;
    uint32_t typeSpecFlags;
    ssize_t block = res.getResource(ident, &value, false, density, &typeSpecFlags, &config);
    if (kThrowOnBadId) {
        if (block == BAD_INDEX) {
            jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
            return 0;
        }
    }
    uint32_t ref = ident;
    if (resolve) {
        block = res.resolveReference(&value, block, &ref, &typeSpecFlags, &config);
        if (kThrowOnBadId) {
            if (block == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return 0;
            }
        }
    }
    if (block >= 0) {
        return copyValue(env, outValue, &res, value, ref, block, typeSpecFlags, &config);
    }

    return static_cast<jint>(block);
}

static jint android_content_AssetManager_loadResourceBagValue(JNIEnv* env, jobject clazz,
                                                           jint ident, jint bagEntryId,
                                                           jobject outValue, jboolean resolve)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    const ResTable& res(am->getResources());

    // Now lock down the resource object and start pulling stuff from it.
    res.lock();

    ssize_t block = -1;
    Res_value value;

    const ResTable::bag_entry* entry = NULL;
    uint32_t typeSpecFlags;
    ssize_t entryCount = res.getBagLocked(ident, &entry, &typeSpecFlags);

    for (ssize_t i=0; i<entryCount; i++) {
        if (((uint32_t)bagEntryId) == entry->map.name.ident) {
            block = entry->stringBlock;
            value = entry->map.value;
        }
        entry++;
    }

    res.unlock();

    if (block < 0) {
        return static_cast<jint>(block);
    }

    uint32_t ref = ident;
    if (resolve) {
        block = res.resolveReference(&value, block, &ref, &typeSpecFlags);
        if (kThrowOnBadId) {
            if (block == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return 0;
            }
        }
    }
    if (block >= 0) {
        return copyValue(env, outValue, &res, value, ref, block, typeSpecFlags);
    }

    return static_cast<jint>(block);
}

static jint android_content_AssetManager_getStringBlockCount(JNIEnv* env, jobject clazz)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    return am->getResources().getTableCount();
}

static jlong android_content_AssetManager_getNativeStringBlock(JNIEnv* env, jobject clazz,
                                                           jint block)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    return reinterpret_cast<jlong>(am->getResources().getTableStringBlock(block));
}

static jstring android_content_AssetManager_getCookieName(JNIEnv* env, jobject clazz,
                                                       jint cookie)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }
    String8 name(am->getAssetPath(static_cast<int32_t>(cookie)));
    if (name.length() == 0) {
        jniThrowException(env, "java/lang/IndexOutOfBoundsException", "Empty cookie name");
        return NULL;
    }
    jstring str = env->NewStringUTF(name.string());
    return str;
}

static jobject android_content_AssetManager_getAssignedPackageIdentifiers(JNIEnv* env, jobject clazz)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    const ResTable& res = am->getResources();

    jobject sparseArray = env->NewObject(gSparseArrayOffsets.classObject,
            gSparseArrayOffsets.constructor);
    const size_t N = res.getBasePackageCount();
    for (size_t i = 0; i < N; i++) {
        const String16 name = res.getBasePackageName(i);
        env->CallVoidMethod(
            sparseArray, gSparseArrayOffsets.put,
            static_cast<jint>(res.getBasePackageId(i)),
            env->NewString(reinterpret_cast<const jchar*>(name.string()),
                           name.size()));
    }
    return sparseArray;
}

static jlong android_content_AssetManager_newTheme(JNIEnv* env, jobject clazz)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    return reinterpret_cast<jlong>(new ResTable::Theme(am->getResources()));
}

static void android_content_AssetManager_deleteTheme(JNIEnv* env, jobject clazz,
                                                     jlong themeHandle)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    delete theme;
}

static void android_content_AssetManager_applyThemeStyle(JNIEnv* env, jobject clazz,
                                                         jlong themeHandle,
                                                         jint styleRes,
                                                         jboolean force)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    theme->applyStyle(styleRes, force ? true : false);
}

static void android_content_AssetManager_copyTheme(JNIEnv* env, jobject clazz,
                                                   jlong destHandle, jlong srcHandle)
{
    ResTable::Theme* dest = reinterpret_cast<ResTable::Theme*>(destHandle);
    ResTable::Theme* src = reinterpret_cast<ResTable::Theme*>(srcHandle);
    dest->setTo(*src);
}

static void android_content_AssetManager_clearTheme(JNIEnv* env, jobject clazz, jlong themeHandle)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    theme->clear();
}

static jint android_content_AssetManager_loadThemeAttributeValue(
    JNIEnv* env, jobject clazz, jlong themeHandle, jint ident, jobject outValue, jboolean resolve)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    const ResTable& res(theme->getResTable());

    Res_value value;
    // XXX value could be different in different configs!
    uint32_t typeSpecFlags = 0;
    ssize_t block = theme->getAttribute(ident, &value, &typeSpecFlags);
    uint32_t ref = 0;
    if (resolve) {
        block = res.resolveReference(&value, block, &ref, &typeSpecFlags);
        if (kThrowOnBadId) {
            if (block == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return 0;
            }
        }
    }
    return block >= 0 ? copyValue(env, outValue, &res, value, ref, block, typeSpecFlags) : block;
}

static jint android_content_AssetManager_getThemeChangingConfigurations(JNIEnv* env, jobject clazz,
                                                                        jlong themeHandle)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    return theme->getChangingConfigurations();
}

static void android_content_AssetManager_dumpTheme(JNIEnv* env, jobject clazz,
                                                   jlong themeHandle, jint pri,
                                                   jstring tag, jstring prefix)
{
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeHandle);
    const ResTable& res(theme->getResTable());
    (void)res;

    // XXX Need to use params.
    theme->dumpToLog();
}

static jboolean android_content_AssetManager_resolveAttrs(JNIEnv* env, jobject clazz,
                                                          jlong themeToken,
                                                          jint defStyleAttr,
                                                          jint defStyleRes,
                                                          jintArray inValues,
                                                          jintArray attrs,
                                                          jintArray outValues,
                                                          jintArray outIndices)
{
    if (themeToken == 0) {
        jniThrowNullPointerException(env, "theme token");
        return JNI_FALSE;
    }
    if (attrs == NULL) {
        jniThrowNullPointerException(env, "attrs");
        return JNI_FALSE;
    }
    if (outValues == NULL) {
        jniThrowNullPointerException(env, "out values");
        return JNI_FALSE;
    }

    const jsize NI = env->GetArrayLength(attrs);
    const jsize NV = env->GetArrayLength(outValues);
    if (NV < (NI*STYLE_NUM_ENTRIES)) {
        jniThrowException(env, "java/lang/IndexOutOfBoundsException", "out values too small");
        return JNI_FALSE;
    }

    jint* src = (jint*)env->GetPrimitiveArrayCritical(attrs, 0);
    if (src == NULL) {
        return JNI_FALSE;
    }

    jint* srcValues = (jint*)env->GetPrimitiveArrayCritical(inValues, 0);
    const jsize NSV = srcValues == NULL ? 0 : env->GetArrayLength(inValues);

    jint* baseDest = (jint*)env->GetPrimitiveArrayCritical(outValues, 0);
    if (baseDest == NULL) {
        env->ReleasePrimitiveArrayCritical(attrs, src, 0);
        return JNI_FALSE;
    }

    jint* indices = NULL;
    if (outIndices != NULL) {
        if (env->GetArrayLength(outIndices) > NI) {
            indices = (jint*)env->GetPrimitiveArrayCritical(outIndices, 0);
        }
    }

    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeToken);
    bool result = ResolveAttrs(theme, defStyleAttr, defStyleRes,
                               (uint32_t*) srcValues, NSV,
                               (uint32_t*) src, NI,
                               (uint32_t*) baseDest,
                               (uint32_t*) indices);

    if (indices != NULL) {
        env->ReleasePrimitiveArrayCritical(outIndices, indices, 0);
    }
    env->ReleasePrimitiveArrayCritical(outValues, baseDest, 0);
    env->ReleasePrimitiveArrayCritical(inValues, srcValues, 0);
    env->ReleasePrimitiveArrayCritical(attrs, src, 0);
    return result ? JNI_TRUE : JNI_FALSE;
}

static void android_content_AssetManager_applyStyle(JNIEnv* env, jobject, jlong themeToken,
        jint defStyleAttr, jint defStyleRes, jlong xmlParserToken, jintArray attrsObj, jint length,
        jlong outValuesAddress, jlong outIndicesAddress) {
    jint* attrs = env->GetIntArrayElements(attrsObj, 0);
    ResTable::Theme* theme = reinterpret_cast<ResTable::Theme*>(themeToken);
    ResXMLParser* xmlParser = reinterpret_cast<ResXMLParser*>(xmlParserToken);
    uint32_t* outValues = reinterpret_cast<uint32_t*>(static_cast<uintptr_t>(outValuesAddress));
    uint32_t* outIndices = reinterpret_cast<uint32_t*>(static_cast<uintptr_t>(outIndicesAddress));
    ApplyStyle(theme, xmlParser, defStyleAttr, defStyleRes,
            reinterpret_cast<const uint32_t*>(attrs), length, outValues, outIndices);
    env->ReleaseIntArrayElements(attrsObj, attrs, JNI_ABORT);
}

static jboolean android_content_AssetManager_retrieveAttributes(JNIEnv* env, jobject clazz,
                                                        jlong xmlParserToken,
                                                        jintArray attrs,
                                                        jintArray outValues,
                                                        jintArray outIndices)
{
    if (xmlParserToken == 0) {
        jniThrowNullPointerException(env, "xmlParserToken");
        return JNI_FALSE;
    }
    if (attrs == NULL) {
        jniThrowNullPointerException(env, "attrs");
        return JNI_FALSE;
    }
    if (outValues == NULL) {
        jniThrowNullPointerException(env, "out values");
        return JNI_FALSE;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return JNI_FALSE;
    }
    const ResTable& res(am->getResources());
    ResXMLParser* xmlParser = (ResXMLParser*)xmlParserToken;

    const jsize NI = env->GetArrayLength(attrs);
    const jsize NV = env->GetArrayLength(outValues);
    if (NV < (NI*STYLE_NUM_ENTRIES)) {
        jniThrowException(env, "java/lang/IndexOutOfBoundsException", "out values too small");
        return JNI_FALSE;
    }

    jint* src = (jint*)env->GetPrimitiveArrayCritical(attrs, 0);
    if (src == NULL) {
        return JNI_FALSE;
    }

    jint* baseDest = (jint*)env->GetPrimitiveArrayCritical(outValues, 0);
    if (baseDest == NULL) {
        env->ReleasePrimitiveArrayCritical(attrs, src, 0);
        return JNI_FALSE;
    }

    jint* indices = NULL;
    if (outIndices != NULL) {
        if (env->GetArrayLength(outIndices) > NI) {
            indices = (jint*)env->GetPrimitiveArrayCritical(outIndices, 0);
        }
    }

    bool result = RetrieveAttributes(&res, xmlParser,
                                     (uint32_t*) src, NI,
                                     (uint32_t*) baseDest,
                                     (uint32_t*) indices);

    if (indices != NULL) {
        env->ReleasePrimitiveArrayCritical(outIndices, indices, 0);
    }
    env->ReleasePrimitiveArrayCritical(outValues, baseDest, 0);
    env->ReleasePrimitiveArrayCritical(attrs, src, 0);
    return result ? JNI_TRUE : JNI_FALSE;
}

static jint android_content_AssetManager_getArraySize(JNIEnv* env, jobject clazz,
                                                       jint id)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }
    const ResTable& res(am->getResources());

    res.lock();
    const ResTable::bag_entry* defStyleEnt = NULL;
    ssize_t bagOff = res.getBagLocked(id, &defStyleEnt);
    res.unlock();

    return static_cast<jint>(bagOff);
}

static jint android_content_AssetManager_retrieveArray(JNIEnv* env, jobject clazz,
                                                        jint id,
                                                        jintArray outValues)
{
    if (outValues == NULL) {
        jniThrowNullPointerException(env, "out values");
        return JNI_FALSE;
    }

    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return JNI_FALSE;
    }
    const ResTable& res(am->getResources());
    ResTable_config config;
    Res_value value;
    ssize_t block;

    const jsize NV = env->GetArrayLength(outValues);

    jint* baseDest = (jint*)env->GetPrimitiveArrayCritical(outValues, 0);
    jint* dest = baseDest;
    if (dest == NULL) {
        jniThrowException(env, "java/lang/OutOfMemoryError", "");
        return JNI_FALSE;
    }

    // Now lock down the resource object and start pulling stuff from it.
    res.lock();

    const ResTable::bag_entry* arrayEnt = NULL;
    uint32_t arrayTypeSetFlags = 0;
    ssize_t bagOff = res.getBagLocked(id, &arrayEnt, &arrayTypeSetFlags);
    const ResTable::bag_entry* endArrayEnt = arrayEnt +
        (bagOff >= 0 ? bagOff : 0);

    int i = 0;
    uint32_t typeSetFlags;
    while (i < NV && arrayEnt < endArrayEnt) {
        block = arrayEnt->stringBlock;
        typeSetFlags = arrayTypeSetFlags;
        config.density = 0;
        value = arrayEnt->map.value;

        uint32_t resid = 0;
        if (value.dataType != Res_value::TYPE_NULL) {
            // Take care of resolving the found resource to its final value.
            //printf("Resolving attribute reference\n");
            ssize_t newBlock = res.resolveReference(&value, block, &resid,
                    &typeSetFlags, &config);
            if (kThrowOnBadId) {
                if (newBlock == BAD_INDEX) {
                    jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                    return JNI_FALSE;
                }
            }
            if (newBlock >= 0) block = newBlock;
        }

        // Deal with the special @null value -- it turns back to TYPE_NULL.
        if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
            value.dataType = Res_value::TYPE_NULL;
            value.data = Res_value::DATA_NULL_UNDEFINED;
        }

        //printf("Attribute 0x%08x: final type=0x%x, data=0x%08x\n", curIdent, value.dataType, value.data);

        // Write the final value back to Java.
        dest[STYLE_TYPE] = value.dataType;
        dest[STYLE_DATA] = value.data;
        dest[STYLE_ASSET_COOKIE] = reinterpret_cast<jint>(res.getTableCookie(block));
        dest[STYLE_RESOURCE_ID] = resid;
        dest[STYLE_CHANGING_CONFIGURATIONS] = typeSetFlags;
        dest[STYLE_DENSITY] = config.density;
        dest += STYLE_NUM_ENTRIES;
        i+= STYLE_NUM_ENTRIES;
        arrayEnt++;
    }

    i /= STYLE_NUM_ENTRIES;

    res.unlock();

    env->ReleasePrimitiveArrayCritical(outValues, baseDest, 0);

    return i;
}

static jlong android_content_AssetManager_openXmlAssetNative(JNIEnv* env, jobject clazz,
                                                         jint cookie,
                                                         jstring fileName)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return 0;
    }

    ALOGV("openXmlAsset in %p (Java object %p)\n", am, clazz);

    ScopedUtfChars fileName8(env, fileName);
    if (fileName8.c_str() == NULL) {
        return 0;
    }

    int32_t assetCookie = static_cast<int32_t>(cookie);
    Asset* a = assetCookie
        ? am->openNonAsset(assetCookie, fileName8.c_str(), Asset::ACCESS_BUFFER)
        : am->openNonAsset(fileName8.c_str(), Asset::ACCESS_BUFFER, &assetCookie);

    if (a == NULL) {
        jniThrowException(env, "java/io/FileNotFoundException", fileName8.c_str());
        return 0;
    }

    const DynamicRefTable* dynamicRefTable =
            am->getResources().getDynamicRefTableForCookie(assetCookie);
    ResXMLTree* block = new ResXMLTree(dynamicRefTable);
    status_t err = block->setTo(a->getBuffer(true), a->getLength(), true);
    a->close();
    delete a;

    if (err != NO_ERROR) {
        jniThrowException(env, "java/io/FileNotFoundException", "Corrupt XML binary file");
        return 0;
    }

    return reinterpret_cast<jlong>(block);
}

static jintArray android_content_AssetManager_getArrayStringInfo(JNIEnv* env, jobject clazz,
                                                                 jint arrayResId)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }
    const ResTable& res(am->getResources());

    const ResTable::bag_entry* startOfBag;
    const ssize_t N = res.lockBag(arrayResId, &startOfBag);
    if (N < 0) {
        return NULL;
    }

    jintArray array = env->NewIntArray(N * 2);
    if (array == NULL) {
        res.unlockBag(startOfBag);
        return NULL;
    }

    Res_value value;
    const ResTable::bag_entry* bag = startOfBag;
    for (size_t i = 0, j = 0; ((ssize_t)i)<N; i++, bag++) {
        jint stringIndex = -1;
        jint stringBlock = 0;
        value = bag->map.value;

        // Take care of resolving the found resource to its final value.
        stringBlock = res.resolveReference(&value, bag->stringBlock, NULL);
        if (value.dataType == Res_value::TYPE_STRING) {
            stringIndex = value.data;
        }

        if (kThrowOnBadId) {
            if (stringBlock == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return array;
            }
        }

        //todo: It might be faster to allocate a C array to contain
        //      the blocknums and indices, put them in there and then
        //      do just one SetIntArrayRegion()
        env->SetIntArrayRegion(array, j, 1, &stringBlock);
        env->SetIntArrayRegion(array, j + 1, 1, &stringIndex);
        j = j + 2;
    }
    res.unlockBag(startOfBag);
    return array;
}

static jobjectArray android_content_AssetManager_getArrayStringResource(JNIEnv* env, jobject clazz,
                                                                        jint arrayResId)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }
    const ResTable& res(am->getResources());

    const ResTable::bag_entry* startOfBag;
    const ssize_t N = res.lockBag(arrayResId, &startOfBag);
    if (N < 0) {
        return NULL;
    }

    jobjectArray array = env->NewObjectArray(N, g_stringClass, NULL);
    if (env->ExceptionCheck()) {
        res.unlockBag(startOfBag);
        return NULL;
    }

    Res_value value;
    const ResTable::bag_entry* bag = startOfBag;
    size_t strLen = 0;
    for (size_t i=0; ((ssize_t)i)<N; i++, bag++) {
        value = bag->map.value;
        jstring str = NULL;

        // Take care of resolving the found resource to its final value.
        ssize_t block = res.resolveReference(&value, bag->stringBlock, NULL);
        if (kThrowOnBadId) {
            if (block == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return array;
            }
        }
        if (value.dataType == Res_value::TYPE_STRING) {
            const ResStringPool* pool = res.getTableStringBlock(block);
            const char* str8 = pool->string8At(value.data, &strLen);
            if (str8 != NULL) {
                str = env->NewStringUTF(str8);
            } else {
                const char16_t* str16 = pool->stringAt(value.data, &strLen);
                str = env->NewString(reinterpret_cast<const jchar*>(str16),
                                     strLen);
            }

            // If one of our NewString{UTF} calls failed due to memory, an
            // exception will be pending.
            if (env->ExceptionCheck()) {
                res.unlockBag(startOfBag);
                return NULL;
            }

            env->SetObjectArrayElement(array, i, str);

            // str is not NULL at that point, otherwise ExceptionCheck would have been true.
            // If we have a large amount of strings in our array, we might
            // overflow the local reference table of the VM.
            env->DeleteLocalRef(str);
        }
    }
    res.unlockBag(startOfBag);
    return array;
}

static jintArray android_content_AssetManager_getArrayIntResource(JNIEnv* env, jobject clazz,
                                                                        jint arrayResId)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }
    const ResTable& res(am->getResources());

    const ResTable::bag_entry* startOfBag;
    const ssize_t N = res.lockBag(arrayResId, &startOfBag);
    if (N < 0) {
        return NULL;
    }

    jintArray array = env->NewIntArray(N);
    if (array == NULL) {
        res.unlockBag(startOfBag);
        return NULL;
    }

    Res_value value;
    const ResTable::bag_entry* bag = startOfBag;
    for (size_t i=0; ((ssize_t)i)<N; i++, bag++) {
        value = bag->map.value;

        // Take care of resolving the found resource to its final value.
        ssize_t block = res.resolveReference(&value, bag->stringBlock, NULL);
        if (kThrowOnBadId) {
            if (block == BAD_INDEX) {
                jniThrowException(env, "java/lang/IllegalStateException", "Bad resource!");
                return array;
            }
        }
        if (value.dataType >= Res_value::TYPE_FIRST_INT
                && value.dataType <= Res_value::TYPE_LAST_INT) {
            int intVal = value.data;
            env->SetIntArrayRegion(array, i, 1, &intVal);
        }
    }
    res.unlockBag(startOfBag);
    return array;
}

static jintArray android_content_AssetManager_getStyleAttributes(JNIEnv* env, jobject clazz,
                                                                 jint styleId)
{
    AssetManager* am = assetManagerForJavaObject(env, clazz);
    if (am == NULL) {
        return NULL;
    }
    const ResTable& res(am->getResources());

    const ResTable::bag_entry* startOfBag;
    const ssize_t N = res.lockBag(styleId, &startOfBag);
    if (N < 0) {
        return NULL;
    }

    jintArray array = env->NewIntArray(N);
    if (array == NULL) {
        res.unlockBag(startOfBag);
        return NULL;
    }

    const ResTable::bag_entry* bag = startOfBag;
    for (size_t i=0; ((ssize_t)i)<N; i++, bag++) {
        int resourceId = bag->map.name.ident;
        env->SetIntArrayRegion(array, i, 1, &resourceId);
    }
    res.unlockBag(startOfBag);
    return array;
}

static void android_content_AssetManager_init(JNIEnv* env, jobject clazz, jboolean isSystem)
{
    if (isSystem) {
        verifySystemIdmaps();
    }
    AssetManager* am = new AssetManager();
    if (am == NULL) {
        jniThrowException(env, "java/lang/OutOfMemoryError", "");
        return;
    }

    am->addDefaultAssets();

    ALOGV("Created AssetManager %p for Java object %p\n", am, clazz);
    env->SetLongField(clazz, gAssetManagerOffsets.mObject, reinterpret_cast<jlong>(am));
}

static void android_content_AssetManager_destroy(JNIEnv* env, jobject clazz)
{
    AssetManager* am = (AssetManager*)
        (env->GetLongField(clazz, gAssetManagerOffsets.mObject));
    ALOGV("Destroying AssetManager %p for Java object %p\n", am, clazz);
    if (am != NULL) {
        delete am;
        env->SetLongField(clazz, gAssetManagerOffsets.mObject, 0);
    }
}

static jint android_content_AssetManager_getGlobalAssetCount(JNIEnv* env, jobject clazz)
{
    return Asset::getGlobalCount();
}

static jobject android_content_AssetManager_getAssetAllocations(JNIEnv* env, jobject clazz)
{
    String8 alloc = Asset::getAssetAllocations();
    if (alloc.length() <= 0) {
        return NULL;
    }

    jstring str = env->NewStringUTF(alloc.string());
    return str;
}

static jint android_content_AssetManager_getGlobalAssetManagerCount(JNIEnv* env, jobject clazz)
{
    return AssetManager::getGlobalCount();
}

// ----------------------------------------------------------------------------

/*
 * JNI registration.
 */
static const JNINativeMethod gAssetManagerMethods[] = {
    /* name, signature, funcPtr */

    // Basic asset stuff.
    { "openAsset",      "(Ljava/lang/String;I)J",
        (void*) android_content_AssetManager_openAsset },
    { "openAssetFd",      "(Ljava/lang/String;[J)Landroid/os/ParcelFileDescriptor;",
        (void*) android_content_AssetManager_openAssetFd },
    { "openNonAssetNative", "(ILjava/lang/String;I)J",
        (void*) android_content_AssetManager_openNonAssetNative },
    { "openNonAssetFdNative", "(ILjava/lang/String;[J)Landroid/os/ParcelFileDescriptor;",
        (void*) android_content_AssetManager_openNonAssetFdNative },
    { "list",           "(Ljava/lang/String;)[Ljava/lang/String;",
        (void*) android_content_AssetManager_list },
    { "destroyAsset",   "(J)V",
        (void*) android_content_AssetManager_destroyAsset },
    { "readAssetChar",  "(J)I",
        (void*) android_content_AssetManager_readAssetChar },
    { "readAsset",      "(J[BII)I",
        (void*) android_content_AssetManager_readAsset },
    { "seekAsset",      "(JJI)J",
        (void*) android_content_AssetManager_seekAsset },
    { "getAssetLength", "(J)J",
        (void*) android_content_AssetManager_getAssetLength },
    { "getAssetRemainingLength", "(J)J",
        (void*) android_content_AssetManager_getAssetRemainingLength },
    { "addAssetPathNative", "(Ljava/lang/String;Z)I",
        (void*) android_content_AssetManager_addAssetPath },
    { "addAssetFdNative", "(Ljava/io/FileDescriptor;Ljava/lang/String;Z)I",
        (void*) android_content_AssetManager_addAssetFd },
    { "addOverlayPathNative",   "(Ljava/lang/String;)I",
        (void*) android_content_AssetManager_addOverlayPath },
    { "isUpToDate",     "()Z",
        (void*) android_content_AssetManager_isUpToDate },

    // Resources.
    { "getLocales",      "()[Ljava/lang/String;",
        (void*) android_content_AssetManager_getLocales },
    { "getNonSystemLocales", "()[Ljava/lang/String;",
        (void*) android_content_AssetManager_getNonSystemLocales },
    { "getSizeConfigurations", "()[Landroid/content/res/Configuration;",
        (void*) android_content_AssetManager_getSizeConfigurations },
    { "setConfiguration", "(IILjava/lang/String;IIIIIIIIIIIIIII)V",
        (void*) android_content_AssetManager_setConfiguration },
    { "getResourceIdentifier","(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
        (void*) android_content_AssetManager_getResourceIdentifier },
    { "getResourceName","(I)Ljava/lang/String;",
        (void*) android_content_AssetManager_getResourceName },
    { "getResourcePackageName","(I)Ljava/lang/String;",
        (void*) android_content_AssetManager_getResourcePackageName },
    { "getResourceTypeName","(I)Ljava/lang/String;",
        (void*) android_content_AssetManager_getResourceTypeName },
    { "getResourceEntryName","(I)Ljava/lang/String;",
        (void*) android_content_AssetManager_getResourceEntryName },
    { "loadResourceValue","(ISLandroid/util/TypedValue;Z)I",
        (void*) android_content_AssetManager_loadResourceValue },
    { "loadResourceBagValue","(IILandroid/util/TypedValue;Z)I",
        (void*) android_content_AssetManager_loadResourceBagValue },
    { "getStringBlockCount","()I",
        (void*) android_content_AssetManager_getStringBlockCount },
    { "getNativeStringBlock","(I)J",
        (void*) android_content_AssetManager_getNativeStringBlock },
    { "getCookieName","(I)Ljava/lang/String;",
        (void*) android_content_AssetManager_getCookieName },
    { "getAssignedPackageIdentifiers","()Landroid/util/SparseArray;",
        (void*) android_content_AssetManager_getAssignedPackageIdentifiers },

    // Themes.
    { "newTheme", "()J",
        (void*) android_content_AssetManager_newTheme },
    { "deleteTheme", "(J)V",
        (void*) android_content_AssetManager_deleteTheme },
    { "applyThemeStyle", "(JIZ)V",
        (void*) android_content_AssetManager_applyThemeStyle },
    { "copyTheme", "(JJ)V",
        (void*) android_content_AssetManager_copyTheme },
    { "clearTheme", "(J)V",
        (void*) android_content_AssetManager_clearTheme },
    { "loadThemeAttributeValue", "(JILandroid/util/TypedValue;Z)I",
        (void*) android_content_AssetManager_loadThemeAttributeValue },
    { "getThemeChangingConfigurations", "(J)I",
        (void*) android_content_AssetManager_getThemeChangingConfigurations },
    { "dumpTheme", "(JILjava/lang/String;Ljava/lang/String;)V",
        (void*) android_content_AssetManager_dumpTheme },
    { "applyStyle","(JIIJ[IIJJ)V",
        (void*) android_content_AssetManager_applyStyle },
    { "resolveAttrs","(JII[I[I[I[I)Z",
        (void*) android_content_AssetManager_resolveAttrs },
    { "retrieveAttributes","(J[I[I[I)Z",
        (void*) android_content_AssetManager_retrieveAttributes },
    { "getArraySize","(I)I",
        (void*) android_content_AssetManager_getArraySize },
    { "retrieveArray","(I[I)I",
        (void*) android_content_AssetManager_retrieveArray },

    // XML files.
    { "openXmlAssetNative", "(ILjava/lang/String;)J",
        (void*) android_content_AssetManager_openXmlAssetNative },

    // Arrays.
    { "getArrayStringResource","(I)[Ljava/lang/String;",
        (void*) android_content_AssetManager_getArrayStringResource },
    { "getArrayStringInfo","(I)[I",
        (void*) android_content_AssetManager_getArrayStringInfo },
    { "getArrayIntResource","(I)[I",
        (void*) android_content_AssetManager_getArrayIntResource },
    { "getStyleAttributes","(I)[I",
        (void*) android_content_AssetManager_getStyleAttributes },

    // Bookkeeping.
    { "init",           "(Z)V",
        (void*) android_content_AssetManager_init },
    { "destroy",        "()V",
        (void*) android_content_AssetManager_destroy },
    { "getGlobalAssetCount", "()I",
        (void*) android_content_AssetManager_getGlobalAssetCount },
    { "getAssetAllocations", "()Ljava/lang/String;",
        (void*) android_content_AssetManager_getAssetAllocations },
    { "getGlobalAssetManagerCount", "()I",
        (void*) android_content_AssetManager_getGlobalAssetManagerCount },
};

int register_android_content_AssetManager(JNIEnv* env)
{
    jclass typedValue = FindClassOrDie(env, "android/util/TypedValue");
    gTypedValueOffsets.mType = GetFieldIDOrDie(env, typedValue, "type", "I");
    gTypedValueOffsets.mData = GetFieldIDOrDie(env, typedValue, "data", "I");
    gTypedValueOffsets.mString = GetFieldIDOrDie(env, typedValue, "string",
                                                 "Ljava/lang/CharSequence;");
    gTypedValueOffsets.mAssetCookie = GetFieldIDOrDie(env, typedValue, "assetCookie", "I");
    gTypedValueOffsets.mResourceId = GetFieldIDOrDie(env, typedValue, "resourceId", "I");
    gTypedValueOffsets.mChangingConfigurations = GetFieldIDOrDie(env, typedValue,
                                                                 "changingConfigurations", "I");
    gTypedValueOffsets.mDensity = GetFieldIDOrDie(env, typedValue, "density", "I");

    jclass assetFd = FindClassOrDie(env, "android/content/res/AssetFileDescriptor");
    gAssetFileDescriptorOffsets.mFd = GetFieldIDOrDie(env, assetFd, "mFd",
                                                      "Landroid/os/ParcelFileDescriptor;");
    gAssetFileDescriptorOffsets.mStartOffset = GetFieldIDOrDie(env, assetFd, "mStartOffset", "J");
    gAssetFileDescriptorOffsets.mLength = GetFieldIDOrDie(env, assetFd, "mLength", "J");

    jclass assetManager = FindClassOrDie(env, "android/content/res/AssetManager");
    gAssetManagerOffsets.mObject = GetFieldIDOrDie(env, assetManager, "mObject", "J");

    jclass stringClass = FindClassOrDie(env, "java/lang/String");
    g_stringClass = MakeGlobalRefOrDie(env, stringClass);

    jclass sparseArrayClass = FindClassOrDie(env, "android/util/SparseArray");
    gSparseArrayOffsets.classObject = MakeGlobalRefOrDie(env, sparseArrayClass);
    gSparseArrayOffsets.constructor = GetMethodIDOrDie(env, gSparseArrayOffsets.classObject,
                                                       "<init>", "()V");
    gSparseArrayOffsets.put = GetMethodIDOrDie(env, gSparseArrayOffsets.classObject, "put",
                                               "(ILjava/lang/Object;)V");

    jclass configurationClass = FindClassOrDie(env, "android/content/res/Configuration");
    gConfigurationOffsets.classObject = MakeGlobalRefOrDie(env, configurationClass);
    gConfigurationOffsets.constructor = GetMethodIDOrDie(env, configurationClass,
            "<init>", "()V");
    gConfigurationOffsets.mSmallestScreenWidthDpOffset = GetFieldIDOrDie(env, configurationClass,
            "smallestScreenWidthDp", "I");
    gConfigurationOffsets.mScreenWidthDpOffset = GetFieldIDOrDie(env, configurationClass,
            "screenWidthDp", "I");
    gConfigurationOffsets.mScreenHeightDpOffset = GetFieldIDOrDie(env, configurationClass,
            "screenHeightDp", "I");

    return RegisterMethodsOrDie(env, "android/content/res/AssetManager", gAssetManagerMethods,
                                NELEM(gAssetManagerMethods));
}

}; // namespace android