android_content_res_ObbScanner.cpp revision 02c8730c1bf19daf48bec8c6995df676a00a73b1 
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 <utils/ObbFile.h>
22
23#include "jni.h"
24#include "utils/misc.h"
25#include "android_runtime/AndroidRuntime.h"
26
27namespace android {
28
29static struct {
30    jclass clazz;
31
32    jfieldID packageName;
33    jfieldID version;
34} gObbInfoClassInfo;
35
36static jboolean android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file,
37        jobject obbInfo)
38{
39    const char* filePath = env->GetStringUTFChars(file, JNI_FALSE);
40
41    sp<ObbFile> obb = new ObbFile();
42    if (!obb->readFrom(filePath)) {
43        env->ReleaseStringUTFChars(file, filePath);
44        return JNI_FALSE;
45    }
46
47    env->ReleaseStringUTFChars(file, filePath);
48
49    const char* packageNameStr = obb->getPackageName().string();
50
51    jstring packageName = env->NewStringUTF(packageNameStr);
52    if (packageName == NULL) {
53        return JNI_FALSE;
54    }
55
56    env->SetObjectField(obbInfo, gObbInfoClassInfo.packageName, packageName);
57    env->SetIntField(obbInfo, gObbInfoClassInfo.version, obb->getVersion());
58
59    return JNI_TRUE;
60}
61
62/*
63 * JNI registration.
64 */
65static JNINativeMethod gMethods[] = {
66    /* name, signature, funcPtr */
67    { "getObbInfo_native", "(Ljava/lang/String;Landroid/content/res/ObbInfo;)Z",
68            (void*) android_content_res_ObbScanner_getObbInfo },
69};
70
71#define FIND_CLASS(var, className) \
72        var = env->FindClass(className); \
73        LOG_FATAL_IF(! var, "Unable to find class " className); \
74        var = jclass(env->NewGlobalRef(var));
75
76#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
77        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
78        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
79
80int register_android_content_res_ObbScanner(JNIEnv* env)
81{
82    FIND_CLASS(gObbInfoClassInfo.clazz, "android/content/res/ObbInfo");
83
84    GET_FIELD_ID(gObbInfoClassInfo.packageName, gObbInfoClassInfo.clazz,
85            "packageName", "Ljava/lang/String;");
86    GET_FIELD_ID(gObbInfoClassInfo.version, gObbInfoClassInfo.clazz,
87            "version", "I");
88
89    return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods,
90            NELEM(gMethods));
91}
92
93}; // namespace android
94
95