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 namespace android { 29 30 static struct { 31 jclass clazz; 32 33 jfieldID packageName; 34 jfieldID version; 35 jfieldID flags; 36 jfieldID salt; 37 } gObbInfoClassInfo; 38 39 static void android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file, 40 jobject obbInfo) 41 { 42 const char* filePath = env->GetStringUTFChars(file, NULL); 43 44 sp<ObbFile> obb = new ObbFile(); 45 if (!obb->readFrom(filePath)) { 46 env->ReleaseStringUTFChars(file, filePath); 47 jniThrowException(env, "java/io/IOException", "Could not read OBB file"); 48 return; 49 } 50 51 env->ReleaseStringUTFChars(file, filePath); 52 53 const char* packageNameStr = obb->getPackageName().string(); 54 55 jstring packageName = env->NewStringUTF(packageNameStr); 56 if (packageName == NULL) { 57 jniThrowException(env, "java/io/IOException", "Could not read OBB file"); 58 return; 59 } 60 61 env->SetObjectField(obbInfo, gObbInfoClassInfo.packageName, packageName); 62 env->SetIntField(obbInfo, gObbInfoClassInfo.version, obb->getVersion()); 63 env->SetIntField(obbInfo, gObbInfoClassInfo.flags, obb->getFlags()); 64 65 size_t saltLen; 66 const unsigned char* salt = obb->getSalt(&saltLen); 67 if (saltLen > 0) { 68 jbyteArray saltArray = env->NewByteArray(saltLen); 69 env->SetByteArrayRegion(saltArray, 0, saltLen, (jbyte*)salt); 70 env->SetObjectField(obbInfo, gObbInfoClassInfo.salt, saltArray); 71 } 72 } 73 74 /* 75 * JNI registration. 76 */ 77 static JNINativeMethod gMethods[] = { 78 /* name, signature, funcPtr */ 79 { "getObbInfo_native", "(Ljava/lang/String;Landroid/content/res/ObbInfo;)V", 80 (void*) android_content_res_ObbScanner_getObbInfo }, 81 }; 82 83 #define FIND_CLASS(var, className) \ 84 var = env->FindClass(className); \ 85 LOG_FATAL_IF(! var, "Unable to find class " className); 86 87 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \ 88 var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \ 89 LOG_FATAL_IF(! var, "Unable to find field " fieldName); 90 91 int register_android_content_res_ObbScanner(JNIEnv* env) 92 { 93 jclass clazz; 94 FIND_CLASS(clazz, "android/content/res/ObbInfo"); 95 96 GET_FIELD_ID(gObbInfoClassInfo.packageName, clazz, 97 "packageName", "Ljava/lang/String;"); 98 GET_FIELD_ID(gObbInfoClassInfo.version, clazz, 99 "version", "I"); 100 GET_FIELD_ID(gObbInfoClassInfo.flags, clazz, 101 "flags", "I"); 102 GET_FIELD_ID(gObbInfoClassInfo.salt, clazz, 103 "salt", "[B"); 104 105 return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods, 106 NELEM(gMethods)); 107 } 108 109 }; // namespace android 110