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
30namespace android {
31
32static struct {
33    jclass clazz;
34
35    jfieldID packageName;
36    jfieldID version;
37    jfieldID flags;
38    jfieldID salt;
39} gObbInfoClassInfo;
40
41static 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 */
79static 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
85int 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