| /* |
| * Copyright (C) 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 parcel_file_descriptor_offsets_t |
| { |
| jfieldID mFileDescriptor; |
| } gParcelFileDescriptorOffsets; |
| |
| static jobject android_os_ParcelFileDescriptor_getFileDescriptorFromFd(JNIEnv* env, |
| jobject clazz, jint origfd) |
| { |
| int fd = dup(origfd); |
| if (fd < 0) { |
| jniThrowException(env, "java/io/IOException", strerror(errno)); |
| return NULL; |
| } |
| return jniCreateFileDescriptor(env, fd); |
| } |
| |
| static jobject android_os_ParcelFileDescriptor_getFileDescriptorFromFdNoDup(JNIEnv* env, |
| jobject clazz, jint fd) |
| { |
| return jniCreateFileDescriptor(env, fd); |
| } |
| |
| static void android_os_ParcelFileDescriptor_createPipeNative(JNIEnv* env, |
| jobject clazz, jobjectArray outFds) |
| { |
| int fds[2]; |
| if (pipe(fds) < 0) { |
| int therr = errno; |
| jniThrowException(env, "java/io/IOException", strerror(therr)); |
| return; |
| } |
| |
| for (int i=0; i<2; i++) { |
| jobject fdObj = jniCreateFileDescriptor(env, fds[i]); |
| env->SetObjectArrayElement(outFds, i, fdObj); |
| } |
| } |
| |
| static jint getFd(JNIEnv* env, jobject clazz) |
| { |
| jobject descriptor = env->GetObjectField(clazz, gParcelFileDescriptorOffsets.mFileDescriptor); |
| if (descriptor == NULL) return -1; |
| return jniGetFDFromFileDescriptor(env, descriptor); |
| } |
| |
| 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 jlong android_os_ParcelFileDescriptor_getFdNative(JNIEnv* env, jobject clazz) |
| { |
| jint fd = getFd(env, clazz); |
| if (fd < 0) { |
| jniThrowException(env, "java/lang/IllegalArgumentException", "bad file descriptor"); |
| return -1; |
| } |
| |
| return fd; |
| } |
| |
| static const JNINativeMethod gParcelFileDescriptorMethods[] = { |
| {"getFileDescriptorFromFd", "(I)Ljava/io/FileDescriptor;", |
| (void*)android_os_ParcelFileDescriptor_getFileDescriptorFromFd}, |
| {"getFileDescriptorFromFdNoDup", "(I)Ljava/io/FileDescriptor;", |
| (void*)android_os_ParcelFileDescriptor_getFileDescriptorFromFdNoDup}, |
| {"createPipeNative", "([Ljava/io/FileDescriptor;)V", |
| (void*)android_os_ParcelFileDescriptor_createPipeNative}, |
| {"getStatSize", "()J", |
| (void*)android_os_ParcelFileDescriptor_getStatSize}, |
| {"seekTo", "(J)J", |
| (void*)android_os_ParcelFileDescriptor_seekTo}, |
| {"getFdNative", "()I", |
| (void*)android_os_ParcelFileDescriptor_getFdNative} |
| }; |
| |
| const char* const kParcelFileDescriptorPathName = "android/os/ParcelFileDescriptor"; |
| |
| int register_android_os_ParcelFileDescriptor(JNIEnv* env) |
| { |
| jclass clazz = env->FindClass(kParcelFileDescriptorPathName); |
| LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor"); |
| 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)); |
| } |
| |
| } |