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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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_TAG "File"
#include "JNIHelp.h"
#include "JniConstants.h"
#include "JniException.h"
#include "ScopedPrimitiveArray.h"
#include "ScopedUtfChars.h"
#include "readlink.h"
#include "toStringArray.h"
#include <string>
#include <vector>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
static jstring File_readlink(JNIEnv* env, jclass, jstring javaPath) {
ScopedUtfChars path(env, javaPath);
if (path.c_str() == NULL) {
return NULL;
}
std::string result;
if (!readlink(path.c_str(), result)) {
jniThrowIOException(env, errno);
return NULL;
}
return env->NewStringUTF(result.c_str());
}
static jstring File_realpath(JNIEnv* env, jclass, jstring javaPath) {
ScopedUtfChars path(env, javaPath);
if (path.c_str() == NULL) {
return NULL;
}
extern bool realpath(const char* path, std::string& resolved);
std::string result;
if (!realpath(path.c_str(), result)) {
jniThrowIOException(env, errno);
return NULL;
}
return env->NewStringUTF(result.c_str());
}
static jboolean File_setLastModifiedImpl(JNIEnv* env, jclass, jstring javaPath, jlong ms) {
ScopedUtfChars path(env, javaPath);
if (path.c_str() == NULL) {
return JNI_FALSE;
}
// We want to preserve the access time.
struct stat sb;
if (stat(path.c_str(), &sb) == -1) {
return JNI_FALSE;
}
// TODO: we could get microsecond resolution with utimes(3), "legacy" though it is.
utimbuf times;
times.actime = sb.st_atime;
times.modtime = static_cast<time_t>(ms / 1000);
return (utime(path.c_str(), ×) == 0);
}
// Iterates over the filenames in the given directory.
class ScopedReaddir {
public:
ScopedReaddir(const char* path) {
mDirStream = opendir(path);
mIsBad = (mDirStream == NULL);
}
~ScopedReaddir() {
if (mDirStream != NULL) {
closedir(mDirStream);
}
}
// Returns the next filename, or NULL.
const char* next() {
if (mIsBad) {
return NULL;
}
errno = 0;
dirent* result = readdir(mDirStream);
if (result != NULL) {
return result->d_name;
}
if (errno != 0) {
mIsBad = true;
}
return NULL;
}
// Has an error occurred on this stream?
bool isBad() const {
return mIsBad;
}
private:
DIR* mDirStream;
bool mIsBad;
// Disallow copy and assignment.
ScopedReaddir(const ScopedReaddir&);
void operator=(const ScopedReaddir&);
};
typedef std::vector<std::string> DirEntries;
// Reads the directory referred to by 'pathBytes', adding each directory entry
// to 'entries'.
static bool readDirectory(JNIEnv* env, jstring javaPath, DirEntries& entries) {
ScopedUtfChars path(env, javaPath);
if (path.c_str() == NULL) {
return false;
}
ScopedReaddir dir(path.c_str());
const char* filename;
while ((filename = dir.next()) != NULL) {
if (strcmp(filename, ".") != 0 && strcmp(filename, "..") != 0) {
// TODO: this hides allocation failures from us. Push directory iteration up into Java?
entries.push_back(filename);
}
}
return !dir.isBad();
}
static jobjectArray File_listImpl(JNIEnv* env, jclass, jstring javaPath) {
// Read the directory entries into an intermediate form.
DirEntries entries;
if (!readDirectory(env, javaPath, entries)) {
return NULL;
}
// Translate the intermediate form into a Java String[].
return toStringArray(env, entries);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(File, listImpl, "(Ljava/lang/String;)[Ljava/lang/String;"),
NATIVE_METHOD(File, readlink, "(Ljava/lang/String;)Ljava/lang/String;"),
NATIVE_METHOD(File, realpath, "(Ljava/lang/String;)Ljava/lang/String;"),
NATIVE_METHOD(File, setLastModifiedImpl, "(Ljava/lang/String;J)Z"),
};
void register_java_io_File(JNIEnv* env) {
jniRegisterNativeMethods(env, "java/io/File", gMethods, NELEM(gMethods));
}
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