1 /* 2 * Copyright 2010, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "ObbScanner" 18 19 #include <utils/Log.h> 20 #include <utils/String8.h> 21 #include <androidfw/ObbFile.h> 22 23 #include "jni.h" 24 #include "JNIHelp.h" 25 #include "utils/misc.h" 26 #include "android_runtime/AndroidRuntime.h" 27 28 #include "core_jni_helpers.h" 29 30 namespace android { 31 32 static struct { 33 jclass clazz; 34 35 jfieldID packageName; 36 jfieldID version; 37 jfieldID flags; 38 jfieldID salt; 39 } gObbInfoClassInfo; 40 41 static void android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file, 42 jobject obbInfo) 43 { 44 const char* filePath = env->GetStringUTFChars(file, NULL); 45 46 sp<ObbFile> obb = new ObbFile(); 47 if (!obb->readFrom(filePath)) { 48 env->ReleaseStringUTFChars(file, filePath); 49 jniThrowException(env, "java/io/IOException", "Could not read OBB file"); 50 return; 51 } 52 53 env->ReleaseStringUTFChars(file, filePath); 54 55 const char* packageNameStr = obb->getPackageName().string(); 56 57 jstring packageName = env->NewStringUTF(packageNameStr); 58 if (packageName == NULL) { 59 jniThrowException(env, "java/io/IOException", "Could not read OBB file"); 60 return; 61 } 62 63 env->SetObjectField(obbInfo, gObbInfoClassInfo.packageName, packageName); 64 env->SetIntField(obbInfo, gObbInfoClassInfo.version, obb->getVersion()); 65 env->SetIntField(obbInfo, gObbInfoClassInfo.flags, obb->getFlags()); 66 67 size_t saltLen; 68 const unsigned char* salt = obb->getSalt(&saltLen); 69 if (saltLen > 0) { 70 jbyteArray saltArray = env->NewByteArray(saltLen); 71 env->SetByteArrayRegion(saltArray, 0, saltLen, (jbyte*)salt); 72 env->SetObjectField(obbInfo, gObbInfoClassInfo.salt, saltArray); 73 } 74 } 75 76 /* 77 * JNI registration. 78 */ 79 static const JNINativeMethod gMethods[] = { 80 /* name, signature, funcPtr */ 81 { "getObbInfo_native", "(Ljava/lang/String;Landroid/content/res/ObbInfo;)V", 82 (void*) android_content_res_ObbScanner_getObbInfo }, 83 }; 84 85 int register_android_content_res_ObbScanner(JNIEnv* env) 86 { 87 jclass clazz = FindClassOrDie(env, "android/content/res/ObbInfo"); 88 89 gObbInfoClassInfo.packageName = GetFieldIDOrDie(env, clazz, "packageName", 90 "Ljava/lang/String;"); 91 gObbInfoClassInfo.version = GetFieldIDOrDie(env, clazz, "version", "I"); 92 gObbInfoClassInfo.flags = GetFieldIDOrDie(env, clazz, "flags", "I"); 93 gObbInfoClassInfo.salt = GetFieldIDOrDie(env, clazz, "salt", "[B"); 94 95 return RegisterMethodsOrDie(env, "android/content/res/ObbScanner", gMethods, NELEM(gMethods)); 96 } 97 98 }; // namespace android 99