From 1396dc468d5a64bb0d85f69bf7e78bd944e84fe2 Mon Sep 17 00:00:00 2001
From: mxve <68632137+mxve@users.noreply.github.com>
Date: Sun, 10 Nov 2024 23:34:26 +0100
Subject: [PATCH] initial release

---
 .github/workflows/release.yaml |  38 ++
 .gitignore                     |   1 +
 Cargo.lock                     | 759 +++++++++++++++++++++++++++++++++
 Cargo.toml                     |   8 +
 README.md                      |  18 +
 src/main.rs                    | 198 +++++++++
 6 files changed, 1022 insertions(+)
 create mode 100644 .github/workflows/release.yaml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/main.rs

diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
new file mode 100644
index 0000000..a799dcd
--- /dev/null
+++ b/.github/workflows/release.yaml
@@ -0,0 +1,38 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - v[0-9]+.*
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/create-gh-release-action@v1.8.2
+        with:
+          draft: true
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  upload-assets:
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-20.04
+          - target: x86_64-unknown-linux-musl
+            os: ubuntu-latest
+          - target: i686-pc-windows-msvc
+            os: windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/upload-rust-binary-action@v1.22.0
+        with:
+          target: ${{ matrix.target }}
+          bin: shrink-iw4x
+          tar: unix
+          zip: windows
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5ef85a9
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,759 @@
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+ "flate2",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2e2d937
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "shrink-iw4x"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+zip = "2.2"
+walkdir = "2.5"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d9595d7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# Shrink IW4x
+
+A tool to minimize the size of an IW4x installation specifically for dedicated server use. This tool removes unnecessary assets like textures, sounds, and video files to create a lightweight server installation. The final result will be around 7GB in size.
+
+> [!IMPORTANT]
+> The resulting installation will be unusable for normal gameplay, as all media assets are removed. Use this only for dedicated server purposes.
+
+## Usage
+
+1. Download the latest release from the releases page
+2. Place the executable in your MW2 folder
+3. Run the executable
+
+Alternatively, you can specify the MW2 path directly:
+
+```
+shrink-iw4x.exe "C:\server\Call of Duty Modern Warfare 2"
+```
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..636960d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,198 @@
+use std::env;
+use std::fs::{self, File};
+use std::io;
+use std::path::Path;
+use walkdir::WalkDir;
+use zip::{ZipArchive, ZipWriter};
+
+const DIRS_TO_PROCESS: [&str; 2] = ["main", "iw4x"];
+const REMOVABLE_PATTERNS: [&str; 3] = ["images", "sound", "video"];
+const REMOVABLE_EXTENSIONS: [&str; 2] = ["iwi", "mp3"];
+const MB_DIVISOR: f64 = 1_048_576.0;
+
+struct ProcessingStats {
+    files_removed: u32,
+    bytes_removed: u64,
+}
+
+impl ProcessingStats {
+    fn new() -> Self {
+        Self {
+            files_removed: 0,
+            bytes_removed: 0,
+        }
+    }
+
+    fn add(&mut self, files: u32, bytes: u64) {
+        self.files_removed += files;
+        self.bytes_removed += bytes;
+    }
+
+    fn display_total(&self) {
+        println!("\nTotal files removed: {}", self.files_removed);
+        println!(
+            "Total size removed: {:.2} MB",
+            self.bytes_removed as f64 / MB_DIVISOR
+        );
+    }
+}
+
+fn main() -> io::Result<()> {
+    let base_dir = env::args()
+        .nth(1)
+        .map(|p| Path::new(&p).to_owned())
+        .unwrap_or_else(|| Path::new(".").to_owned());
+
+    if !base_dir.exists() {
+        println!("Directory '{}' not found", base_dir.display());
+        return Ok(());
+    }
+
+    let mut stats = ProcessingStats::new();
+
+    for dir_name in DIRS_TO_PROCESS {
+        process_directory(&base_dir, dir_name, &mut stats)?;
+    }
+
+    stats.display_total();
+    Ok(())
+}
+
+fn process_directory(base_dir: &Path, dir_name: &str, stats: &mut ProcessingStats) -> io::Result<()> {
+    let work_dir = base_dir.join(dir_name);
+    if !work_dir.exists() {
+        println!("Directory '{}' not found, skipping...", work_dir.display());
+        return Ok(());
+    }
+
+    println!("\nProcessing directory: {}", work_dir.display());
+
+    if let Some(video_bytes) = process_video_directory(&work_dir)? {
+        stats.add(0, video_bytes);
+    }
+
+    process_iwd_files(&work_dir, stats)?;
+
+    Ok(())
+}
+
+fn process_video_directory(work_dir: &Path) -> io::Result<Option<u64>> {
+    let video_dir = work_dir.join("video");
+    if !video_dir.exists() {
+        return Ok(None);
+    }
+
+    let video_size = get_dir_size(&video_dir)?;
+    println!(
+        "Removing video directory ({:.2} MB)...",
+        video_size as f64 / MB_DIVISOR
+    );
+    fs::remove_dir_all(&video_dir)?;
+    Ok(Some(video_size))
+}
+
+fn process_iwd_files(work_dir: &Path, stats: &mut ProcessingStats) -> io::Result<()> {
+    for entry in WalkDir::new(work_dir).min_depth(1).max_depth(1) {
+        let entry = entry?;
+        let path = entry.path();
+
+        if path.is_file() && path.extension().map_or(false, |ext| ext == "iwd") {
+            println!("Processing: {}", path.display());
+            match process_iwd_file(path) {
+                Ok((files, bytes)) => stats.add(files, bytes),
+                Err(e) => println!("Error processing {}: {}", path.display(), e),
+            }
+        }
+    }
+    Ok(())
+}
+
+fn get_dir_size(path: &Path) -> io::Result<u64> {
+    let mut total_size = 0;
+    for entry in WalkDir::new(path)
+        .into_iter()
+        .filter_map(|e| e.ok())
+        .filter(|e| e.path().is_file())
+    {
+        total_size += entry.metadata()?.len();
+    }
+    Ok(total_size)
+}
+
+fn should_remove_file(name: &str) -> bool {
+    let path = Path::new(name);
+    REMOVABLE_PATTERNS
+        .iter()
+        .any(|&pattern| path.starts_with(pattern))
+        || path
+            .extension()
+            .and_then(|ext| ext.to_str())
+            .map_or(false, |ext| REMOVABLE_EXTENSIONS.contains(&ext))
+}
+
+fn process_iwd_file(path: &Path) -> io::Result<(u32, u64)> {
+    let file = File::open(path)?;
+    let mut archive = ZipArchive::new(file)?;
+    let total_files = archive.len();
+
+    let (files_to_remove, bytes_to_remove) = analyze_archive(&mut archive)?;
+    if files_to_remove.is_empty() {
+        return Ok((0, 0));
+    }
+
+    create_filtered_archive(path, &mut archive, &files_to_remove, total_files)?;
+
+    println!(
+        "Removed {} files ({:.2} MB) from {}",
+        files_to_remove.len(),
+        bytes_to_remove as f64 / MB_DIVISOR,
+        path.display()
+    );
+
+    Ok((files_to_remove.len() as u32, bytes_to_remove))
+}
+
+fn analyze_archive(archive: &mut ZipArchive<File>) -> io::Result<(Vec<usize>, u64)> {
+    let mut files_to_remove = Vec::new();
+    let mut bytes_to_remove = 0;
+
+    for i in 0..archive.len() {
+        let file = archive.by_index(i)?;
+        if should_remove_file(file.name()) {
+            files_to_remove.push(i);
+            bytes_to_remove += file.size();
+        }
+    }
+
+    Ok((files_to_remove, bytes_to_remove))
+}
+
+fn create_filtered_archive(
+    path: &Path,
+    archive: &mut ZipArchive<File>,
+    files_to_remove: &[usize],
+    total_files: usize,
+) -> io::Result<()> {
+    let temp_path = path.with_extension("iwd.temp");
+    let temp_file = File::create(&temp_path)?;
+    let mut zip_writer = ZipWriter::new(temp_file);
+
+    for i in 0..total_files {
+        if files_to_remove.contains(&i) {
+            continue;
+        }
+
+        let file = archive.by_index(i)?;
+        let name = file.name().to_string();
+
+        if let Err(e) = zip_writer.raw_copy_file(file) {
+            println!("Failed to copy {}: {}", name, e);
+        }
+    }
+
+    zip_writer.finish()?;
+    fs::remove_file(path)?;
+    fs::rename(temp_path, path)?;
+
+    Ok(())
+}