1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #define LOG_TAG "File"
19
20 #include "JNIHelp.h"
21 #include "JniConstants.h"
22 #include "JniException.h"
23 #include "ScopedPrimitiveArray.h"
24 #include "ScopedUtfChars.h"
25 #include "toStringArray.h"
26
27 #include <string>
28 #include <vector>
29
30 #include <dirent.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <sys/stat.h>
36 #include <sys/types.h>
37 #include <time.h>
38 #include <unistd.h>
39 #include <utime.h>
40
File_canonicalizePath(JNIEnv * env,jclass,jstring javaPath)41 static jstring File_canonicalizePath(JNIEnv* env, jclass, jstring javaPath) {
42 ScopedUtfChars path(env, javaPath);
43 if (path.c_str() == NULL) {
44 return NULL;
45 }
46
47 extern bool canonicalize_path(const char* path, std::string& resolved);
48 std::string result;
49 if (!canonicalize_path(path.c_str(), result)) {
50 jniThrowIOException(env, errno);
51 return NULL;
52 }
53 return env->NewStringUTF(result.c_str());
54 }
55
File_setLastModifiedImpl(JNIEnv * env,jclass,jstring javaPath,jlong ms)56 static jboolean File_setLastModifiedImpl(JNIEnv* env, jclass, jstring javaPath, jlong ms) {
57 ScopedUtfChars path(env, javaPath);
58 if (path.c_str() == NULL) {
59 return JNI_FALSE;
60 }
61
62 // We want to preserve the access time.
63 struct stat sb;
64 if (stat(path.c_str(), &sb) == -1) {
65 return JNI_FALSE;
66 }
67
68 // TODO: we could get microsecond resolution with utimes(3), "legacy" though it is.
69 utimbuf times;
70 times.actime = sb.st_atime;
71 times.modtime = static_cast<time_t>(ms / 1000);
72 return (utime(path.c_str(), ×) == 0);
73 }
74
75 // Iterates over the filenames in the given directory.
76 class ScopedReaddir {
77 public:
ScopedReaddir(const char * path)78 ScopedReaddir(const char* path) {
79 mDirStream = opendir(path);
80 mIsBad = (mDirStream == NULL);
81 }
82
~ScopedReaddir()83 ~ScopedReaddir() {
84 if (mDirStream != NULL) {
85 closedir(mDirStream);
86 }
87 }
88
89 // Returns the next filename, or NULL.
next()90 const char* next() {
91 if (mIsBad) {
92 return NULL;
93 }
94 errno = 0;
95 dirent* result = readdir(mDirStream);
96 if (result != NULL) {
97 return result->d_name;
98 }
99 if (errno != 0) {
100 mIsBad = true;
101 }
102 return NULL;
103 }
104
105 // Has an error occurred on this stream?
isBad() const106 bool isBad() const {
107 return mIsBad;
108 }
109
110 private:
111 DIR* mDirStream;
112 bool mIsBad;
113
114 // Disallow copy and assignment.
115 ScopedReaddir(const ScopedReaddir&);
116 void operator=(const ScopedReaddir&);
117 };
118
119 typedef std::vector<std::string> DirEntries;
120
121 // Reads the directory referred to by 'pathBytes', adding each directory entry
122 // to 'entries'.
readDirectory(JNIEnv * env,jstring javaPath,DirEntries & entries)123 static bool readDirectory(JNIEnv* env, jstring javaPath, DirEntries& entries) {
124 ScopedUtfChars path(env, javaPath);
125 if (path.c_str() == NULL) {
126 return false;
127 }
128
129 ScopedReaddir dir(path.c_str());
130 const char* filename;
131 while ((filename = dir.next()) != NULL) {
132 if (strcmp(filename, ".") != 0 && strcmp(filename, "..") != 0) {
133 // TODO: this hides allocation failures from us. Push directory iteration up into Java?
134 entries.push_back(filename);
135 }
136 }
137 return !dir.isBad();
138 }
139
File_listImpl(JNIEnv * env,jclass,jstring javaPath)140 static jobjectArray File_listImpl(JNIEnv* env, jclass, jstring javaPath) {
141 // Read the directory entries into an intermediate form.
142 DirEntries entries;
143 if (!readDirectory(env, javaPath, entries)) {
144 return NULL;
145 }
146 // Translate the intermediate form into a Java String[].
147 return toStringArray(env, entries);
148 }
149
150 static JNINativeMethod gMethods[] = {
151 NATIVE_METHOD(File, canonicalizePath, "(Ljava/lang/String;)Ljava/lang/String;"),
152 NATIVE_METHOD(File, listImpl, "(Ljava/lang/String;)[Ljava/lang/String;"),
153 NATIVE_METHOD(File, setLastModifiedImpl, "(Ljava/lang/String;J)Z"),
154 };
register_java_io_File(JNIEnv * env)155 void register_java_io_File(JNIEnv* env) {
156 jniRegisterNativeMethods(env, "java/io/File", gMethods, NELEM(gMethods));
157 }
158