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
28namespace android {
29
30static struct {
31    jclass clazz;
32
33    jfieldID packageName;
34    jfieldID version;
35    jfieldID flags;
36    jfieldID salt;
37} gObbInfoClassInfo;
38
39static 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 */
77static 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
91int 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