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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 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));
}
}
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