android.os.FileUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2006 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.
*/
package android.os;
import android.provider.DocumentsContract.Document;
import android.system.ErrnoException;
import android.system.Os;
import android.text.TextUtils;
import android.util.Log;
import android.webkit.MimeTypeMap;
import libcore.util.EmptyArray;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Objects;
import java.util.regex.Pattern;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
/**
* Tools for managing files. Not for public consumption.
*/
public class FileUtils {
private static final String TAG = "FileUtils";
public static final int S_IRWXU = 00700;
public static final int S_IRUSR = 00400;
public static final int S_IWUSR = 00200;
public static final int S_IXUSR = 00100;
public static final int S_IRWXG = 00070;
public static final int S_IRGRP = 00040;
public static final int S_IWGRP = 00020;
public static final int S_IXGRP = 00010;
public static final int S_IRWXO = 00007;
public static final int S_IROTH = 00004;
public static final int S_IWOTH = 00002;
public static final int S_IXOTH = 00001;
/** Regular expression for safe filenames: no spaces or metacharacters.
*
* Use a preload holder so that FileUtils can be compile-time initialized.
*/
private static class NoImagePreloadHolder {
public static final Pattern SAFE_FILENAME_PATTERN = Pattern.compile("[\\w%+,./=_-]+");
}
private static final File[] EMPTY = new File[0];
/**
* Set owner and mode of of given {@link File}.
*
* @param mode to apply through {@code chmod}
* @param uid to apply through {@code chown}, or -1 to leave unchanged
* @param gid to apply through {@code chown}, or -1 to leave unchanged
* @return 0 on success, otherwise errno.
*/
public static int setPermissions(File path, int mode, int uid, int gid) {
return setPermissions(path.getAbsolutePath(), mode, uid, gid);
}
/**
* Set owner and mode of of given path.
*
* @param mode to apply through {@code chmod}
* @param uid to apply through {@code chown}, or -1 to leave unchanged
* @param gid to apply through {@code chown}, or -1 to leave unchanged
* @return 0 on success, otherwise errno.
*/
public static int setPermissions(String path, int mode, int uid, int gid) {
throw new UnsupportedOperationException("STUB");
}
/**
* Set owner and mode of of given {@link FileDescriptor}.
*
* @param mode to apply through {@code chmod}
* @param uid to apply through {@code chown}, or -1 to leave unchanged
* @param gid to apply through {@code chown}, or -1 to leave unchanged
* @return 0 on success, otherwise errno.
*/
public static int setPermissions(FileDescriptor fd, int mode, int uid, int gid) {
throw new UnsupportedOperationException("STUB");
}
public static void copyPermissions(File from, File to) throws IOException {
throw new UnsupportedOperationException("STUB");
}
/**
* Return owning UID of given path, otherwise -1.
*/
public static int getUid(String path) {
try {
return Os.stat(path).st_uid;
} catch (ErrnoException e) {
return -1;
}
}
/**
* Perform an fsync on the given FileOutputStream. The stream at this
* point must be flushed but not yet closed.
*/
public static boolean sync(FileOutputStream stream) {
try {
if (stream != null) {
stream.getFD().sync();
}
return true;
} catch (IOException e) {
}
return false;
}
@Deprecated
public static boolean copyFile(File srcFile, File destFile) {
try {
copyFileOrThrow(srcFile, destFile);
return true;
} catch (IOException e) {
return false;
}
}
// copy a file from srcFile to destFile, return true if succeed, return
// false if fail
public static void copyFileOrThrow(File srcFile, File destFile) throws IOException {
try (InputStream in = new FileInputStream(srcFile)) {
copyToFileOrThrow(in, destFile);
}
}
@Deprecated
public static boolean copyToFile(InputStream inputStream, File destFile) {
try {
copyToFileOrThrow(inputStream, destFile);
return true;
} catch (IOException e) {
return false;
}
}
/**
* Copy data from a source stream to destFile.
* Return true if succeed, return false if failed.
*/
public static void copyToFileOrThrow(InputStream inputStream, File destFile)
throws IOException {
if (destFile.exists()) {
destFile.delete();
}
FileOutputStream out = new FileOutputStream(destFile);
try {
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) >= 0) {
out.write(buffer, 0, bytesRead);
}
} finally {
out.flush();
try {
out.getFD().sync();
} catch (IOException e) {
}
out.close();
}
}
/**
* Check if a filename is "safe" (no metacharacters or spaces).
* @param file The file to check
*/
public static boolean isFilenameSafe(File file) {
// Note, we check whether it matches what's known to be safe,
// rather than what's known to be unsafe. Non-ASCII, control
// characters, etc. are all unsafe by default.
return NoImagePreloadHolder.SAFE_FILENAME_PATTERN.matcher(file.getPath()).matches();
}
/**
* Read a text file into a String, optionally limiting the length.
* @param file to read (will not seek, so things like /proc files are OK)
* @param max length (positive for head, negative of tail, 0 for no limit)
* @param ellipsis to add of the file was truncated (can be null)
* @return the contents of the file, possibly truncated
* @throws IOException if something goes wrong reading the file
*/
public static String readTextFile(File file, int max, String ellipsis) throws IOException {
InputStream input = new FileInputStream(file);
// wrapping a BufferedInputStream around it because when reading /proc with unbuffered
// input stream, bytes read not equal to buffer size is not necessarily the correct
// indication for EOF; but it is true for BufferedInputStream due to its implementation.
BufferedInputStream bis = new BufferedInputStream(input);
try {
long size = file.length();
if (max > 0 || (size > 0 && max == 0)) { // "head" mode: read the first N bytes
if (size > 0 && (max == 0 || size < max)) max = (int) size;
byte[] data = new byte[max + 1];
int length = bis.read(data);
if (length <= 0) return "";
if (length <= max) return new String(data, 0, length);
if (ellipsis == null) return new String(data, 0, max);
return new String(data, 0, max) + ellipsis;
} else if (max < 0) { // "tail" mode: keep the last N
int len;
boolean rolled = false;
byte[] last = null;
byte[] data = null;
do {
if (last != null) rolled = true;
byte[] tmp = last; last = data; data = tmp;
if (data == null) data = new byte[-max];
len = bis.read(data);
} while (len == data.length);
if (last == null && len <= 0) return "";
if (last == null) return new String(data, 0, len);
if (len > 0) {
rolled = true;
System.arraycopy(last, len, last, 0, last.length - len);
System.arraycopy(data, 0, last, last.length - len, len);
}
if (ellipsis == null || !rolled) return new String(last);
return ellipsis + new String(last);
} else { // "cat" mode: size unknown, read it all in streaming fashion
ByteArrayOutputStream contents = new ByteArrayOutputStream();
int len;
byte[] data = new byte[1024];
do {
len = bis.read(data);
if (len > 0) contents.write(data, 0, len);
} while (len == data.length);
return contents.toString();
}
} finally {
bis.close();
input.close();
}
}
public static void stringToFile(File file, String string) throws IOException {
stringToFile(file.getAbsolutePath(), string);
}
/**
* Writes string to file. Basically same as "echo -n $string > $filename"
*
* @param filename
* @param string
* @throws IOException
*/
public static void stringToFile(String filename, String string) throws IOException {
FileWriter out = new FileWriter(filename);
try {
out.write(string);
} finally {
out.close();
}
}
/**
* Computes the checksum of a file using the CRC32 checksum routine.
* The value of the checksum is returned.
*
* @param file the file to checksum, must not be null
* @return the checksum value or an exception is thrown.
*/
public static long checksumCrc32(File file) throws FileNotFoundException, IOException {
CRC32 checkSummer = new CRC32();
CheckedInputStream cis = null;
try {
cis = new CheckedInputStream( new FileInputStream(file), checkSummer);
byte[] buf = new byte[128];
while(cis.read(buf) >= 0) {
// Just read for checksum to get calculated.
}
return checkSummer.getValue();
} finally {
if (cis != null) {
try {
cis.close();
} catch (IOException e) {
}
}
}
}
/**
* Delete older files in a directory until only those matching the given
* constraints remain.
*
* @param minCount Always keep at least this many files.
* @param minAge Always keep files younger than this age.
* @return if any files were deleted.
*/
public static boolean deleteOlderFiles(File dir, int minCount, long minAge) {
if (minCount < 0 || minAge < 0) {
throw new IllegalArgumentException("Constraints must be positive or 0");
}
final File[] files = dir.listFiles();
if (files == null) return false;
// Sort with newest files first
Arrays.sort(files, new Comparator() {
@Override
public int compare(File lhs, File rhs) {
return (int) (rhs.lastModified() - lhs.lastModified());
}
});
// Keep at least minCount files
boolean deleted = false;
for (int i = minCount; i < files.length; i++) {
final File file = files[i];
// Keep files newer than minAge
final long age = System.currentTimeMillis() - file.lastModified();
if (age > minAge) {
if (file.delete()) {
Log.d(TAG, "Deleted old file " + file);
deleted = true;
}
}
}
return deleted;
}
/**
* Test if a file lives under the given directory, either as a direct child
* or a distant grandchild.
*
* Both files must have been resolved using
* {@link File#getCanonicalFile()} to avoid symlink or path traversal
* attacks.
*/
public static boolean contains(File[] dirs, File file) {
for (File dir : dirs) {
if (contains(dir, file)) {
return true;
}
}
return false;
}
/**
* Test if a file lives under the given directory, either as a direct child
* or a distant grandchild.
*
* Both files must have been resolved using
* {@link File#getCanonicalFile()} to avoid symlink or path traversal
* attacks.
*/
public static boolean contains(File dir, File file) {
if (dir == null || file == null) return false;
String dirPath = dir.getAbsolutePath();
String filePath = file.getAbsolutePath();
if (dirPath.equals(filePath)) {
return true;
}
if (!dirPath.endsWith("/")) {
dirPath += "/";
}
return filePath.startsWith(dirPath);
}
public static boolean deleteContentsAndDir(File dir) {
if (deleteContents(dir)) {
return dir.delete();
} else {
return false;
}
}
public static boolean deleteContents(File dir) {
File[] files = dir.listFiles();
boolean success = true;
if (files != null) {
for (File file : files) {
if (file.isDirectory()) {
success &= deleteContents(file);
}
if (!file.delete()) {
Log.w(TAG, "Failed to delete " + file);
success = false;
}
}
}
return success;
}
private static boolean isValidExtFilenameChar(char c) {
switch (c) {
case '\0':
case '/':
return false;
default:
return true;
}
}
/**
* Check if given filename is valid for an ext4 filesystem.
*/
public static boolean isValidExtFilename(String name) {
return (name != null) && name.equals(buildValidExtFilename(name));
}
/**
* Mutate the given filename to make it valid for an ext4 filesystem,
* replacing any invalid characters with "_".
*/
public static String buildValidExtFilename(String name) {
if (TextUtils.isEmpty(name) || ".".equals(name) || "..".equals(name)) {
return "(invalid)";
}
final StringBuilder res = new StringBuilder(name.length());
for (int i = 0; i < name.length(); i++) {
final char c = name.charAt(i);
if (isValidExtFilenameChar(c)) {
res.append(c);
} else {
res.append('_');
}
}
trimFilename(res, 255);
return res.toString();
}
private static boolean isValidFatFilenameChar(char c) {
if ((0x00 <= c && c <= 0x1f)) {
return false;
}
switch (c) {
case '"':
case '*':
case '/':
case ':':
case '<':
case '>':
case '?':
case '\\':
case '|':
case 0x7F:
return false;
default:
return true;
}
}
/**
* Check if given filename is valid for a FAT filesystem.
*/
public static boolean isValidFatFilename(String name) {
return (name != null) && name.equals(buildValidFatFilename(name));
}
/**
* Mutate the given filename to make it valid for a FAT filesystem,
* replacing any invalid characters with "_".
*/
public static String buildValidFatFilename(String name) {
if (TextUtils.isEmpty(name) || ".".equals(name) || "..".equals(name)) {
return "(invalid)";
}
final StringBuilder res = new StringBuilder(name.length());
for (int i = 0; i < name.length(); i++) {
final char c = name.charAt(i);
if (isValidFatFilenameChar(c)) {
res.append(c);
} else {
res.append('_');
}
}
// Even though vfat allows 255 UCS-2 chars, we might eventually write to
// ext4 through a FUSE layer, so use that limit.
trimFilename(res, 255);
return res.toString();
}
public static String trimFilename(String str, int maxBytes) {
final StringBuilder res = new StringBuilder(str);
trimFilename(res, maxBytes);
return res.toString();
}
private static void trimFilename(StringBuilder res, int maxBytes) {
byte[] raw = res.toString().getBytes(StandardCharsets.UTF_8);
if (raw.length > maxBytes) {
maxBytes -= 3;
while (raw.length > maxBytes) {
res.deleteCharAt(res.length() / 2);
raw = res.toString().getBytes(StandardCharsets.UTF_8);
}
res.insert(res.length() / 2, "...");
}
}
public static String rewriteAfterRename(File beforeDir, File afterDir, String path) {
if (path == null) return null;
final File result = rewriteAfterRename(beforeDir, afterDir, new File(path));
return (result != null) ? result.getAbsolutePath() : null;
}
public static String[] rewriteAfterRename(File beforeDir, File afterDir, String[] paths) {
if (paths == null) return null;
final String[] result = new String[paths.length];
for (int i = 0; i < paths.length; i++) {
result[i] = rewriteAfterRename(beforeDir, afterDir, paths[i]);
}
return result;
}
/**
* Given a path under the "before" directory, rewrite it to live under the
* "after" directory. For example, {@code /before/foo/bar.txt} would become
* {@code /after/foo/bar.txt}.
*/
public static File rewriteAfterRename(File beforeDir, File afterDir, File file) {
if (file == null || beforeDir == null || afterDir == null) return null;
if (contains(beforeDir, file)) {
final String splice = file.getAbsolutePath().substring(
beforeDir.getAbsolutePath().length());
return new File(afterDir, splice);
}
return null;
}
private static File buildUniqueFileWithExtension(File parent, String name, String ext)
throws FileNotFoundException {
File file = buildFile(parent, name, ext);
// If conflicting file, try adding counter suffix
int n = 0;
while (file.exists()) {
if (n++ >= 32) {
throw new FileNotFoundException("Failed to create unique file");
}
file = buildFile(parent, name + " (" + n + ")", ext);
}
return file;
}
/**
* Generates a unique file name under the given parent directory. If the display name doesn't
* have an extension that matches the requested MIME type, the default extension for that MIME
* type is appended. If a file already exists, the name is appended with a numerical value to
* make it unique.
*
* For example, the display name 'example' with 'text/plain' MIME might produce
* 'example.txt' or 'example (1).txt', etc.
*
* @throws FileNotFoundException
*/
public static File buildUniqueFile(File parent, String mimeType, String displayName)
throws FileNotFoundException {
final String[] parts = splitFileName(mimeType, displayName);
return buildUniqueFileWithExtension(parent, parts[0], parts[1]);
}
/**
* Generates a unique file name under the given parent directory, keeping
* any extension intact.
*/
public static File buildUniqueFile(File parent, String displayName)
throws FileNotFoundException {
final String name;
final String ext;
// Extract requested extension from display name
final int lastDot = displayName.lastIndexOf('.');
if (lastDot >= 0) {
name = displayName.substring(0, lastDot);
ext = displayName.substring(lastDot + 1);
} else {
name = displayName;
ext = null;
}
return buildUniqueFileWithExtension(parent, name, ext);
}
/**
* Splits file name into base name and extension.
* If the display name doesn't have an extension that matches the requested MIME type, the
* extension is regarded as a part of filename and default extension for that MIME type is
* appended.
*/
public static String[] splitFileName(String mimeType, String displayName) {
String name;
String ext;
if (Document.MIME_TYPE_DIR.equals(mimeType)) {
name = displayName;
ext = null;
} else {
String mimeTypeFromExt;
// Extract requested extension from display name
final int lastDot = displayName.lastIndexOf('.');
if (lastDot >= 0) {
name = displayName.substring(0, lastDot);
ext = displayName.substring(lastDot + 1);
mimeTypeFromExt = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
ext.toLowerCase());
} else {
name = displayName;
ext = null;
mimeTypeFromExt = null;
}
if (mimeTypeFromExt == null) {
mimeTypeFromExt = "application/octet-stream";
}
final String extFromMimeType = MimeTypeMap.getSingleton().getExtensionFromMimeType(
mimeType);
if (Objects.equals(mimeType, mimeTypeFromExt) || Objects.equals(ext, extFromMimeType)) {
// Extension maps back to requested MIME type; allow it
} else {
// No match; insist that create file matches requested MIME
name = displayName;
ext = extFromMimeType;
}
}
if (ext == null) {
ext = "";
}
return new String[] { name, ext };
}
private static File buildFile(File parent, String name, String ext) {
if (TextUtils.isEmpty(ext)) {
return new File(parent, name);
} else {
return new File(parent, name + "." + ext);
}
}
public static String[] listOrEmpty(File dir) {
if (dir == null) return EmptyArray.STRING;
final String[] res = dir.list();
if (res != null) {
return res;
} else {
return EmptyArray.STRING;
}
}
public static File[] listFilesOrEmpty(File dir) {
if (dir == null) return EMPTY;
final File[] res = dir.listFiles();
if (res != null) {
return res;
} else {
return EMPTY;
}
}
public static File[] listFilesOrEmpty(File dir, FilenameFilter filter) {
if (dir == null) return EMPTY;
final File[] res = dir.listFiles(filter);
if (res != null) {
return res;
} else {
return EMPTY;
}
}
public static File newFileOrNull(String path) {
return (path != null) ? new File(path) : null;
}
}