1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/* //device/libs/android_runtime/android_os_ParcelFileDescriptor.cpp
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "JNIHelp.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <utils/Log.h>
#include <android_runtime/AndroidRuntime.h>
namespace android
{
static struct file_descriptor_offsets_t
{
jclass mClass;
jmethodID mConstructor;
jfieldID mDescriptor;
} gFileDescriptorOffsets;
static struct socket_offsets_t
{
jfieldID mSocketImpl;
} gSocketOffsets;
static struct socket_impl_offsets_t
{
jfieldID mFileDescriptor;
} gSocketImplOffsets;
static jobject android_os_ParcelFileDescriptor_getFileDescriptorFromSocket(JNIEnv* env,
jobject clazz, jobject object)
{
jobject socketImpl = env->GetObjectField(object, gSocketOffsets.mSocketImpl);
jobject fileDescriptor = env->GetObjectField(socketImpl, gSocketImplOffsets.mFileDescriptor);
jint fd = env->GetIntField(fileDescriptor, gFileDescriptorOffsets.mDescriptor);
jobject fileDescriptorClone = env->NewObject(gFileDescriptorOffsets.mClass,
gFileDescriptorOffsets.mConstructor);
if (fileDescriptorClone != NULL) {
env->SetIntField(fileDescriptorClone, gFileDescriptorOffsets.mDescriptor, dup(fd));
}
return fileDescriptorClone;
}
static const JNINativeMethod gParcelFileDescriptorMethods[] = {
{"getFileDescriptorFromSocket", "(Ljava/net/Socket;)Ljava/io/FileDescriptor;",
(void*)android_os_ParcelFileDescriptor_getFileDescriptorFromSocket}
};
const char* const kParcelFileDescriptorPathName = "android/os/ParcelFileDescriptor";
int register_android_os_ParcelFileDescriptor(JNIEnv* env)
{
jclass clazz;
clazz = env->FindClass("java/net/Socket");
LOG_FATAL_IF(clazz == NULL, "Unable to find class java.net.Socket");
gSocketOffsets.mSocketImpl = env->GetFieldID(clazz, "impl", "Ljava/net/SocketImpl;");
LOG_FATAL_IF(gSocketOffsets.mSocketImpl == NULL,
"Unable to find impl field in java.net.Socket");
clazz = env->FindClass("java/net/SocketImpl");
LOG_FATAL_IF(clazz == NULL, "Unable to find class java.net.SocketImpl");
gSocketImplOffsets.mFileDescriptor = env->GetFieldID(clazz, "fd", "Ljava/io/FileDescriptor;");
LOG_FATAL_IF(gSocketImplOffsets.mFileDescriptor == NULL,
"Unable to find fd field in java.net.SocketImpl");
clazz = env->FindClass("java/io/FileDescriptor");
LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
gFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
gFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "()V");
gFileDescriptorOffsets.mDescriptor = env->GetFieldID(clazz, "descriptor", "I");
LOG_FATAL_IF(gFileDescriptorOffsets.mDescriptor == NULL,
"Unable to find descriptor field in java.io.FileDescriptor");
clazz = env->FindClass(kParcelFileDescriptorPathName);
LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
return AndroidRuntime::registerNativeMethods(
env, kParcelFileDescriptorPathName,
gParcelFileDescriptorMethods, NELEM(gParcelFileDescriptorMethods));
}
}
|
