The flutter_downloader plugin throws a java.io.IOException: File name too long error

**Describe the bug**

The flutter_downloader plugin throws a java.io.IOException: File name too long error even when the filename length seems to be within limits. Additionally, a NullPointerException occurs during the download operation.

Directory path: /storage/emulated/0/Download/Thitsarparami/mp3/

Subdirectories: ဒေါက်တာနန္ဒမာလာဘိဝံသ/သုတဓမ္မဂဝေသီ-ba-1-မိလိန္ဒပဉှာ

Final filename: အပိုင်း-၄-မိလိန္ဒမင်းနှင့်ရှင်နာဂသေနတို့၏-ဗုဒ္ဓဝါဒရေးရာ-အခြေအတင်ပြောဆိုချက်များ-၁၂-၆-၁၆_1743004401641.mp3

/storage/emulated/0/Download/Thitsarparami/mp3/ဒေါက်တာနန္ဒမာလာဘိဝံသ/သုတဓမ္မဂဝေသီ-ba-1-မိလိန္ဒပဉှာ/အပိုင်း-၄-မိလိန္ဒမင်းနှင့်ရှင်နာဂသေနတို့၏-ဗုဒ္ဓဝါဒရေးရာ-အခြေအတင်ပြောဆိုချက်များ-၁၂-၆-၁၆_1743004401641.mp3

**To Reproduce**

To Reproduce

Steps to reproduce the behavior:

1. Use the flutter_downloader plugin to enqueue a download with a long filename and path.
2. Provide a valid URL for the file and a potentially long filename and directory path.
3. Observe the error when attempting to download the file.

**Expected behavior**

The file should be downloaded successfully with the provided filename and path, and no exceptions should be thrown due to filename length or null values.

**Screenshots**

**Device information:**

[✓] Flutter (Channel stable, 3.27.1, on macOS 15.3.2 24D81 darwin-x64, locale en-GB)
⡿^⣽Aungs-MacBook-Pro:thitsarparami_mobile aungmyooo$ flutter doctor -v
[✓] Flutter (Channel stable, 3.27.1, on macOS 15.3.2 24D81 darwin-x64, locale en-GB)
• Flutter version 3.27.1 on channel stable at /Users/aungmyooo/Development/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 17025dd882 (3 months ago), 2024-12-17 03:23:09 +0900
• Engine revision cb4b5fff73
• Dart version 3.6.0
• DevTools version 2.40.2

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/aungmyooo/Library/Android/sdk
• Platform android-35, build-tools 34.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 21.0.5+-12932927-b750.29)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16C5032a
• CocoaPods version 1.16.2

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 21.0.5+-12932927-b750.29)

[✓] VS Code (version 1.98.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.106.0

[✓] Connected device (4 available)
• SM N975F (mobile) • RF8M82Y3K9A • android-arm64 • Android 12 (API 31)
• Aung Myo’s iPhone (mobile) • 00008120-0006612E0198A01E • ios • iOS 18.3.2 22D82
• macOS (desktop) • macos • darwin-x64 • macOS 15.3.2 24D81 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 134.0.6998.166

[✓] Network resources
• All expected network resources are available.

• No issues found!

**Additional context**

The issue seems to arise when the total file path (directory + filename) exceeds the system's maximum file path limit (usually around 255 bytes for the filename or up to 4096 bytes for the total path). The filename is correctly truncated to a safe length, but the path itself might be causing issues due to a combination of the long directory and filename. There’s also an occurrence of a NullPointerException in DownloadWorker.kt which seems unrelated to filename length but might indicate other issues in the plugin's logic for handling downloads.