ContentProvider के दिए गए फ़ाइल नाम पर गलत तरीके से भरोसा करना

// Code in
// https://developer.android.com/training/secure-file-sharing/request-file#OpenFile
// used to obtain file descriptor (fd)

try {
    val inputStream = FileInputStream(fd)
    val tempFile = File.createTempFile("temp", null, cacheDir)
    val outputStream = FileOutputStream(tempFile)
    val buf = ByteArray(1024)
    var len: Int
    len = inputStream.read(buf)
    while (len > 0) {
        if (len != -1) {
            outputStream.write(buf, 0, len)
            len = inputStream.read(buf)
        }
    }
    inputStream.close()
    outputStream.close()
} catch (e: IOException) {
    e.printStackTrace()
    Log.e("MainActivity", "File copy error.")
    return
}

// Code in
// https://developer.android.com/training/secure-file-sharing/request-file#OpenFile
// used to obtain file descriptor (fd)

FileInputStream inputStream = new FileInputStream(fd);

// Create a temporary file
File tempFile = File.createTempFile("temp", null, getCacheDir());

// Copy the contents of the file to the temporary file
try {
    OutputStream outputStream = new FileOutputStream(tempFile))
    byte[] buffer = new byte[1024];
    int length;
    while ((length = inputStream.read(buffer)) > 0) {
        outputStream.write(buffer, 0, length);
    }
} catch (IOException e) {
    e.printStackTrace();
    Log.e("MainActivity", "File copy error.");
    return;
}

protected fun sanitizeFilename(displayName: String): String {
    val badCharacters = arrayOf("..", "/")
    val segments = displayName.split("/")
    var fileName = segments[segments.size - 1]
    for (suspString in badCharacters) {
        fileName = fileName.replace(suspString, "_")
    }
    return fileName
}

val displayName = returnCursor.getString(nameIndex)
val fileName = sanitizeFilename(displayName)
val filePath = File(context.filesDir, fileName).path

// saferOpenFile defined in Android developer documentation
val outputFile = saferOpenFile(filePath, context.filesDir.canonicalPath)

// fd obtained using Requesting a shared file from Android developer
// documentation

val inputStream = FileInputStream(fd)

// Copy the contents of the file to the new file
try {
    val outputStream = FileOutputStream(outputFile)
    val buffer = ByteArray(1024)
    var length: Int
    while (inputStream.read(buffer).also { length = it } > 0) {
        outputStream.write(buffer, 0, length)
    }
} catch (e: IOException) {
    // Handle exception
}

protected String sanitizeFilename(String displayName) {
    String[] badCharacters = new String[] { "..", "/" };
    String[] segments = displayName.split("/");
    String fileName = segments[segments.length - 1];
    for (String suspString : badCharacters) {
        fileName = fileName.replace(suspString, "_");
    }
    return fileName;
}

String displayName = returnCursor.getString(nameIndex);
String fileName = sanitizeFilename(displayName);
String filePath = new File(context.getFilesDir(), fileName).getPath();

// saferOpenFile defined in Android developer documentation

File outputFile = saferOpenFile(filePath,
    context.getFilesDir().getCanonicalPath());

// fd obtained using Requesting a shared file from Android developer
// documentation

FileInputStream inputStream = new FileInputStream(fd);

// Copy the contents of the file to the new file
try {
    OutputStream outputStream = new FileOutputStream(outputFile))
    byte[] buffer = new byte[1024];
    int length;
    while ((length = inputStream.read(buffer)) > 0) {
        outputStream.write(buffer, 0, length);
    }
} catch (IOException e) {
    // Handle exception
}