| /* //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. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| |
| #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 struct parcel_file_descriptor_offsets_t |
| { |
| jclass mClass; |
| jfieldID mFileDescriptor; |
| } gParcelFileDescriptorOffsets; |
| |
| 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 jint getFd(JNIEnv* env, jobject clazz) |
| { |
| jobject descriptor = env->GetObjectField(clazz, gParcelFileDescriptorOffsets.mFileDescriptor); |
| if (descriptor == NULL) return -1; |
| return env->GetIntField(descriptor, gFileDescriptorOffsets.mDescriptor); |
| } |
| |
| static jlong android_os_ParcelFileDescriptor_getStatSize(JNIEnv* env, |
| jobject clazz) |
| { |
| jint fd = getFd(env, clazz); |
| if (fd < 0) { |
| jniThrowException(env, "java/lang/IllegalArgumentException", "bad file descriptor"); |
| return -1; |
| } |
| |
| struct stat st; |
| if (fstat(fd, &st) != 0) { |
| return -1; |
| } |
| |
| if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) { |
| return st.st_size; |
| } |
| |
| return -1; |
| } |
| |
| static jlong android_os_ParcelFileDescriptor_seekTo(JNIEnv* env, |
| jobject clazz, jlong pos) |
| { |
| jint fd = getFd(env, clazz); |
| if (fd < 0) { |
| jniThrowException(env, "java/lang/IllegalArgumentException", "bad file descriptor"); |
| return -1; |
| } |
| |
| return lseek(fd, pos, SEEK_SET); |
| } |
| |
| static const JNINativeMethod gParcelFileDescriptorMethods[] = { |
| {"getFileDescriptorFromSocket", "(Ljava/net/Socket;)Ljava/io/FileDescriptor;", |
| (void*)android_os_ParcelFileDescriptor_getFileDescriptorFromSocket}, |
| {"getStatSize", "()J", |
| (void*)android_os_ParcelFileDescriptor_getStatSize}, |
| {"seekTo", "(J)J", |
| (void*)android_os_ParcelFileDescriptor_seekTo} |
| }; |
| |
| 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"); |
| gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz); |
| gParcelFileDescriptorOffsets.mFileDescriptor = env->GetFieldID(clazz, "mFileDescriptor", "Ljava/io/FileDescriptor;"); |
| LOG_FATAL_IF(gParcelFileDescriptorOffsets.mFileDescriptor == NULL, |
| "Unable to find mFileDescriptor field in android.os.ParcelFileDescriptor"); |
| |
| return AndroidRuntime::registerNativeMethods( |
| env, kParcelFileDescriptorPathName, |
| gParcelFileDescriptorMethods, NELEM(gParcelFileDescriptorMethods)); |
| } |
| |
| } |