android_content_res_ObbScanner.cpp revision 02ca31fbae9f35dd30f79de6927fae11b549391a 
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    jfieldID flags;
35} gObbInfoClassInfo;
36
37static jboolean android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file,
38        jobject obbInfo)
39{
40    const char* filePath = env->GetStringUTFChars(file, JNI_FALSE);
41
42    sp<ObbFile> obb = new ObbFile();
43    if (!obb->readFrom(filePath)) {
44        env->ReleaseStringUTFChars(file, filePath);
45        return JNI_FALSE;
46    }
47
48    env->ReleaseStringUTFChars(file, filePath);
49
50    const char* packageNameStr = obb->getPackageName().string();
51
52    jstring packageName = env->NewStringUTF(packageNameStr);
53    if (packageName == NULL) {
54        return JNI_FALSE;
55    }
56
57    env->SetObjectField(obbInfo, gObbInfoClassInfo.packageName, packageName);
58    env->SetIntField(obbInfo, gObbInfoClassInfo.version, obb->getVersion());
59
60    return JNI_TRUE;
61}
62
63/*
64 * JNI registration.
65 */
66static JNINativeMethod gMethods[] = {
67    /* name, signature, funcPtr */
68    { "getObbInfo_native", "(Ljava/lang/String;Landroid/content/res/ObbInfo;)Z",
69            (void*) android_content_res_ObbScanner_getObbInfo },
70};
71
72#define FIND_CLASS(var, className) \
73        var = env->FindClass(className); \
74        LOG_FATAL_IF(! var, "Unable to find class " className); \
75        var = jclass(env->NewGlobalRef(var));
76
77#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
78        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
79        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
80
81int register_android_content_res_ObbScanner(JNIEnv* env)
82{
83    FIND_CLASS(gObbInfoClassInfo.clazz, "android/content/res/ObbInfo");
84
85    GET_FIELD_ID(gObbInfoClassInfo.packageName, gObbInfoClassInfo.clazz,
86            "packageName", "Ljava/lang/String;");
87    GET_FIELD_ID(gObbInfoClassInfo.version, gObbInfoClassInfo.clazz,
88            "version", "I");
89    GET_FIELD_ID(gObbInfoClassInfo.flags, gObbInfoClassInfo.clazz,
90            "flags", "I");
91
92    return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods,
93            NELEM(gMethods));
94}
95
96}; // namespace android
97
98