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/*
* 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 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));
}
}
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