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
android_content_res_ObbScanner_getObbInfo(JNIEnv * env,jobject clazz,jstring file,jobject obbInfo)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 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
register_android_content_res_ObbScanner(JNIEnv * env)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