Release v2.5.3.1-beta: smart Zstd compression, Blake3 delta-sync, multi-send, pause/resume, priority queue, and 4-part version parser

Cargo.lock

@@ -654,6 +654,19 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "blake3"
+version = "1.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d9e454fc11f76977dc803893aff6304ed33d6a26efae8696573bea74baa27ae"
+dependencies = [
+ "arrayvec",
+ "cc",
+ "cfg-if",
+ "constant_time_eq",
+ "cpufeatures 0.3.0",
+]
+
 [[package]]
 name = "block"
 version = "0.1.6"
@@ -1034,6 +1047,12 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "constant_time_eq"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d52eff69cd5e647efe296129160853a42795992097e8af39800e1060caeea9b"
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -1093,6 +1112,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.1"
@@ -4333,7 +4361,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a978451301f4db1d02937a4ab3ccce137717b81826e79b7d49ffe3244a13c3b8"
 dependencies = [
  "cfg-if",
- "cpufeatures",
+ "cpufeatures 0.2.17",
  "digest",
 ]
 
@@ -4344,7 +4372,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
  "cfg-if",
- "cpufeatures",
+ "cpufeatures 0.2.17",
  "digest",
 ]
 
@@ -6425,11 +6453,12 @@ checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
 
 [[package]]
 name = "zerosend"
-version = "2.5.3-beta"
+version = "2.5.3-beta.1"
 dependencies = [
  "arboard",
  "async-stream",
  "axum",
+ "blake3",
  "bytes",
  "chrono",
  "clap",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "zerosend"
-version = "2.5.3-beta"
+version = "2.5.3-beta.1"
 edition = "2021"
 description = "Fast, peer-to-peer file transfer designed for ZeroTier, Tailscale, Radmin VPN and LAN"
 authors = ["RarDog"]
@@ -49,6 +49,7 @@ sha2 = "0.10"
 hex = "0.4"
 walkdir = "2.5"
 human_bytes = "0.4"
+blake3 = "1.5"
 
 # Windows Native Registry & Sound
 [target.'cfg(windows)'.dependencies]

src/main.rs

@@ -192,6 +192,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
                     TransferState::Rejected => {
                         pb.abandon_with_message("⛔ Transfer rejected by recipient.");
                     }
+                    TransferState::Paused => {
+                        pb.set_message("⏸ Paused");
+                    }
                     TransferState::Canceled => {
                         pb.abandon_with_message("🛑 Canceled.");
                     }

src/transfer/archive.rs

@@ -117,6 +117,40 @@ pub fn estimate_folder_size(dir: &Path) -> u64 {
         .sum()
 }
 
+/// Returns the optimal zstd compression level for a given filename.
+/// Returns 0 for already-compressed formats (store only), 1 otherwise (ultra-fast).
+pub fn optimal_zstd_level_for_file(name: &str) -> i32 {
+    let ext = name.rsplit('.').next().unwrap_or("").to_lowercase();
+    match ext.as_str() {
+        // Already compressed — don't waste CPU
+        "jpg" | "jpeg" | "png" | "gif" | "webp" | "avif" | "heic" |
+        "mp4" | "mkv" | "avi" | "mov" | "wmv" | "flv" | "webm" |
+        "mp3" | "aac" | "ogg" | "flac" | "m4a" | "opus" |
+        "zip" | "rar" | "7z" | "gz" | "bz2" | "xz" | "zst" | "lz4" |
+        "pdf" | "docx" | "xlsx" | "pptx" => 0,
+        // Compressible text/code/data
+        _ => 1,
+    }
+}
+
+/// Estimates the compressibility of a folder: returns true if most content is compressible.
+pub fn folder_is_compressible(dir: &Path) -> bool {
+    let mut compressible = 0u64;
+    let mut total = 0u64;
+    for entry in WalkDir::new(dir).into_iter().filter_map(|e| e.ok()) {
+        if entry.path().is_file() {
+            let size = entry.metadata().map(|m| m.len()).unwrap_or(0);
+            total += size;
+            let name = entry.file_name().to_string_lossy();
+            if optimal_zstd_level_for_file(&name) > 0 {
+                compressible += size;
+            }
+        }
+    }
+    if total == 0 { return true; }
+    (compressible as f64 / total as f64) > 0.3
+}
+
 /// Stream an entire directory as a Zstandard-compressed TAR archive
 /// into a `std::sync::mpsc::SyncSender<Vec<u8>>` channel.
 ///

src/transfer/client.rs

@@ -10,8 +10,9 @@ use super::text_analyzer::{analyze_text, AnalyzedText};
 use crate::network::DiscoveryBeacon;
 use reqwest::Client;
 use sha2::{Digest, Sha256};
-use std::collections::VecDeque;
+use std::collections::{HashMap, VecDeque};
 use std::path::PathBuf;
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 use tokio::fs::File;
@@ -60,6 +61,7 @@ struct ChunkTask {
 
 pub struct TransferClient {
     client: Client,
+    pub pause_flags: Arc<Mutex<HashMap<String, Arc<AtomicBool>>>>,
 }
 
 impl TransferClient {
@@ -71,7 +73,55 @@ impl TransferClient {
             .build()
             .unwrap_or_default();
 
-        Self { client }
+        Self {
+            client,
+            pause_flags: Arc::new(Mutex::new(HashMap::new())),
+        }
+    }
+
+    pub async fn pause_transfer(&self, session_id: &str) {
+        let flags = self.pause_flags.lock().await;
+        if let Some(flag) = flags.get(session_id) {
+            flag.store(true, Ordering::Relaxed);
+        }
+    }
+
+    pub async fn resume_transfer(&self, session_id: &str) {
+        let flags = self.pause_flags.lock().await;
+        if let Some(flag) = flags.get(session_id) {
+            flag.store(false, Ordering::Relaxed);
+        }
+    }
+
+    pub async fn is_paused(&self, session_id: &str) -> bool {
+        let flags = self.pause_flags.lock().await;
+        flags.get(session_id).map(|f| f.load(Ordering::Relaxed)).unwrap_or(false)
+    }
+
+    /// Race-ping multiple candidate URLs and return the fastest responding one
+    pub async fn pick_fastest_url(&self, candidates: &[String]) -> Option<String> {
+        if candidates.is_empty() { return None; }
+        if candidates.len() == 1 { return Some(candidates[0].clone()); }
+
+        let (tx, mut rx) = tokio::sync::mpsc::channel(candidates.len());
+
+        for url in candidates {
+            let client = self.client.clone();
+            let tx = tx.clone();
+            let url = url.clone();
+            tokio::spawn(async move {
+                let start = Instant::now();
+                if let Ok(resp) = client.get(&format!("{}/api/info", url)).send().await {
+                    if resp.status().is_success() {
+                        let latency = start.elapsed().as_millis() as u64;
+                        let _ = tx.send((url, latency)).await;
+                    }
+                }
+            });
+        }
+        drop(tx);
+
+        rx.recv().await.map(|(url, _)| url)
     }
 
     /// Ping a remote peer to check health and get beacon info
@@ -237,15 +287,27 @@ impl TransferClient {
                 speed_bps: 0,
                 state: TransferState::InProgress,
                 checksum_verified: false,
+                compressed_bytes: 0,
             });
 
+            // Feature 1: Determine optimal compression level for entire folder
+            let is_compressible = {
+                let folder_clone2 = folder_path.clone();
+                tokio::task::spawn_blocking(move || {
+                    super::archive::folder_is_compressible(&folder_clone2)
+                })
+                .await
+                .unwrap_or(true)
+            };
+            let folder_zstd_level = if is_compressible { 1 } else { 0 };
+
             // Build a bounded channel: blocking producer → async consumer → HTTP body
             let (tx, rx) = std::sync::mpsc::sync_channel::<std::io::Result<Vec<u8>>>(32);
             let folder_clone = folder_path.clone();
 
             // Spawn blocking tar+zstd compressor thread
             let compress_handle = tokio::task::spawn_blocking(move || {
-                super::archive::stream_folder_as_tar_zst(folder_clone, tx, 1);
+                super::archive::stream_folder_as_tar_zst(folder_clone, tx, folder_zstd_level);
             });
 
             // Collect chunks from the channel into an HTTP body stream
@@ -303,6 +365,7 @@ impl TransferClient {
                         speed_bps: 0,
                         state: TransferState::Completed,
                         checksum_verified: false,
+                        compressed_bytes: 0,
                     });
                 }
                 Ok(r) => {
@@ -326,6 +389,8 @@ impl TransferClient {
             return Err("No files selected for transfer".to_string());
         }
 
+        // Feature 7: Priority queue - sort files by size ascending so small files finish first
+        file_entries.sort_by_key(|(_, _, size)| *size);
 
         let file_metas: Vec<FileMetadata> = file_entries
             .iter()
@@ -367,6 +432,7 @@ impl TransferClient {
             speed_bps: 0,
             state: TransferState::PendingConfirmation,
             checksum_verified: false,
+            compressed_bytes: 0,
         });
 
         let prepare_url = format!("{}/api/transfer/prepare", peer_url);
@@ -397,6 +463,7 @@ impl TransferClient {
                 speed_bps: 0,
                 state: TransferState::Rejected,
                 checksum_verified: false,
+                compressed_bytes: 0,
             });
 
             return Err(reason);
@@ -451,9 +518,16 @@ impl TransferClient {
             }
         }
 
+        let pause_flag = {
+            let mut flags = self.pause_flags.lock().await;
+            let flag = Arc::new(AtomicBool::new(false));
+            flags.insert(session_id.clone(), flag.clone());
+            flag
+        };
+
         let rate_limiter = RateLimiter::new((max_upload_speed_mbps as u64) * 1024 * 1024);
         let tasks_mutex = Arc::new(Mutex::new(chunk_tasks));
-        let (chunk_tx, mut chunk_rx) = tokio::sync::mpsc::unbounded_channel::<(usize, String)>();
+        let (chunk_tx, mut chunk_rx) = tokio::sync::mpsc::unbounded_channel::<(usize, usize, String)>();
         let (progress_update_tx, mut progress_update_rx) = tokio::sync::mpsc::unbounded_channel::<TransferProgress>();
 
         let s_id = session_id.clone();
@@ -461,15 +535,17 @@ impl TransferClient {
         let t_files = file_metas.len();
         let p_tx = progress_update_tx.clone();
 
-        // Background progress tracker with smoothed EMA speed calculation
+        // Background progress tracker with smoothed EMA speed calculation & compressed_bytes
         tokio::spawn(async move {
             let mut total_sent = already_transferred;
+            let mut total_wire = already_transferred;
             let mut last_bytes = total_sent;
             let mut last_time = Instant::now();
             let mut smoothed_speed = 0.0f64;
 
-            while let Some((len, fname)) = chunk_rx.recv().await {
+            while let Some((raw_len, wire_len, fname)) = chunk_rx.recv().await {
-                total_sent += len as u64;
+                total_sent += raw_len as u64;
+                total_wire += wire_len as u64;
 
                 if last_time.elapsed().as_millis() >= 350 {
                     let elapsed_secs = last_time.elapsed().as_secs_f64();
@@ -500,6 +576,7 @@ impl TransferClient {
                         speed_bps,
                         state: TransferState::InProgress,
                         checksum_verified: false,
+                        compressed_bytes: total_wire,
                     });
 
                     last_time = Instant::now();
@@ -520,6 +597,7 @@ impl TransferClient {
             speed_bps: 0,
             state: TransferState::InProgress,
             checksum_verified: false,
+            compressed_bytes: already_transferred,
         });
 
         let start_time = Instant::now();
@@ -532,6 +610,7 @@ impl TransferClient {
             let chunk_url = format!("{}/api/transfer/chunk/{}", peer_url, session_id);
             let limiter_c = rate_limiter.clone();
             let tx_c = chunk_tx.clone();
+            let pause_c = pause_flag.clone();
 
             worker_set.spawn(async move {
                 loop {
@@ -558,16 +637,41 @@ impl TransferClient {
                         return Err(format!("Failed to read chunk from {:?}: {}", chunk_task.file_path, e));
                     }
 
-                    limiter_c.throttle(buf.len()).await;
+                    // Feature 1: Smart compression check per file type
+                    let is_compressible = super::archive::optimal_zstd_level_for_file(&chunk_task.rel_path) > 0;
+                    let (payload, is_zstd) = if is_compressible && buf.len() >= 1024 {
+                        if let Ok(compressed) = zstd::bulk::compress(&buf, 1) {
+                            if compressed.len() + 64 < buf.len() {
+                                (compressed, true)
+                            } else {
+                                (buf, false)
+                            }
+                        } else {
+                            (buf, false)
+                        }
+                    } else {
+                        (buf, false)
+                    };
 
-                    let resp = client_c
+                    let wire_len = payload.len();
+                    limiter_c.throttle(wire_len).await;
+
+                    // Feature 5: Pause support in worker loop
+                    while pause_c.load(Ordering::Relaxed) {
+                        tokio::time::sleep(Duration::from_millis(200)).await;
+                    }
+
+                    let mut req = client_c
                         .post(&chunk_url)
                         .header("x-file-name", &chunk_task.rel_path)
                         .header("x-chunk-offset", chunk_task.offset.to_string())
-                        .header("x-chunk-length", chunk_task.length.to_string())
+                        .header("x-chunk-length", chunk_task.length.to_string());
-                        .body(buf)
+
-                        .send()
+                    if is_zstd {
-                        .await;
+                        req = req.header("x-compression", "zstd");
+                    }
+
+                    let resp = req.body(payload).send().await;
 
                     let is_ok = match &resp {
                         Ok(r) => r.status().is_success(),
@@ -589,7 +693,7 @@ impl TransferClient {
                         }
                     }
 
-                    let _ = tx_c.send((chunk_task.length, chunk_task.rel_path));
+                    let _ = tx_c.send((chunk_task.length, wire_len, chunk_task.rel_path));
                 }
                 Ok::<(), String>(())
             });
@@ -616,6 +720,7 @@ impl TransferClient {
                                     speed_bps: 0,
                                     state: TransferState::Failed(e.clone()),
                                     checksum_verified: false,
+                                    compressed_bytes: 0,
                                 });
                                 return Err(e);
                             }
@@ -636,6 +741,9 @@ impl TransferClient {
             on_progress(progress);
         }
 
+        // Cleanup pause flags
+        self.pause_flags.lock().await.remove(&session_id);
+
         // Finalize transfer on receiver (atomic rename + zip extraction)
         let finish_url = format!("{}/api/transfer/finish/{}", peer_url, session_id);
         let finish_resp = self.client.post(&finish_url).send().await;
@@ -663,6 +771,7 @@ impl TransferClient {
             speed_bps: avg_speed,
             state: TransferState::Completed,
             checksum_verified: true,
+            compressed_bytes: total_bytes,
         });
 
         Ok(())

src/transfer/folder_sync.rs

@@ -22,6 +22,49 @@ pub struct FolderSyncEngine {
     status_tx: mpsc::UnboundedSender<SyncStatusUpdate>,
 }
 
+// ── Sync cache structures ──────────────────────────────────────────────────
+
+#[derive(serde::Serialize, serde::Deserialize, Default)]
+struct SyncCache {
+    files: HashMap<String, CacheEntry>,
+}
+
+#[derive(serde::Serialize, serde::Deserialize, Clone)]
+struct CacheEntry {
+    size: u64,
+    mtime: u64,
+    blake3: Option<String>,
+}
+
+fn load_sync_cache(local_path: &Path) -> SyncCache {
+    let cache_path = local_path.join(".zerosend_sync_cache.json");
+    std::fs::read_to_string(&cache_path)
+        .ok()
+        .and_then(|s| serde_json::from_str(&s).ok())
+        .unwrap_or_default()
+}
+
+fn save_sync_cache(local_path: &Path, cache: &SyncCache) {
+    let cache_path = local_path.join(".zerosend_sync_cache.json");
+    if let Ok(s) = serde_json::to_string(cache) {
+        let _ = std::fs::write(&cache_path, s);
+    }
+}
+
+fn file_blake3(path: &std::path::Path) -> Option<String> {
+    let mut file = std::fs::File::open(path).ok()?;
+    let mut hasher = blake3::Hasher::new();
+    let mut buf = [0u8; 65536];
+    loop {
+        let n = std::io::Read::read(&mut file, &mut buf).ok()?;
+        if n == 0 { break; }
+        hasher.update(&buf[..n]);
+    }
+    Some(hasher.finalize().to_hex().to_string())
+}
+
+// ── Engine ─────────────────────────────────────────────────────────────────
+
 impl FolderSyncEngine {
     pub fn new(
         client: Arc<TransferClient>,
@@ -109,17 +152,31 @@ impl FolderSyncEngine {
             let _ = tokio::fs::create_dir_all(local_path).await;
         }
 
+        // Load sync cache (size/mtime/hash from last sync)
+        let cache = load_sync_cache(local_path);
+
         // Fetch remote directory tree
         let remote_tree = client
             .fetch_shared_tree(peer_url, remote_folder_id, None, None)
             .await?;
 
-        // 1. Scan local files
+        // 1. Scan local files with blake3 hash support
-        let mut local_files: HashMap<String, (u64, u64)> = HashMap::new(); // rel_path -> (size, mtime)
+        // Returns Vec<(rel_path, size, mtime, Option<hash>)>
-        if let Ok(entries) = walkdir_local(local_path) {
+        let local_files_vec = {
-            for (rel, size, mtime) in entries {
+            let local_path_buf = local_path.to_path_buf();
-                local_files.insert(rel, (size, mtime));
+            tokio::task::spawn_blocking(move || walkdir_local(&local_path_buf))
+                .await
+                .map_err(|e| format!("walkdir task error: {}", e))?
+                .map_err(|e| format!("walkdir error: {}", e))?
+        };
+
+        let mut local_files: HashMap<String, (u64, u64, Option<String>)> = HashMap::new();
+        for (rel, size, mtime, hash) in local_files_vec {
+            // Skip the cache file itself
+            if rel == ".zerosend_sync_cache.json" {
+                continue;
             }
+            local_files.insert(rel, (size, mtime, hash));
         }
 
         // 2. Map remote files
@@ -131,12 +188,36 @@ impl FolderSyncEngine {
         }
 
         let mut synced_count = 0;
+        let mut updated_cache = SyncCache { files: cache.files.clone() };
 
         // A. Upload newly created or changed local files to remote
         if !remote_tree.read_only {
-            for (rel, (size, _)) in &local_files {
+            for (rel, (size, mtime, hash)) in &local_files {
                 let need_upload = match remote_files.get(rel) {
-                    Some(remote_size) => *remote_size != *size,
+                    Some(remote_size) => {
+                        if *remote_size != *size {
+                            true // size differs — definitely upload
+                        } else {
+                            // Same size: check cache to detect content-only changes
+                            if let Some(cached) = cache.files.get(rel) {
+                                if cached.size == *size && cached.mtime == *mtime {
+                                    // size AND mtime unchanged since last sync — skip
+                                    false
+                                } else if cached.size == *size {
+                                    // mtime changed but size same — compare blake3
+                                    match (hash, &cached.blake3) {
+                                        (Some(h), Some(c)) => h != c, // upload if hash changed
+                                        _ => true, // no hash available, upload to be safe
+                                    }
+                                } else {
+                                    true // cached size differs — upload
+                                }
+                            } else {
+                                // No cache entry — upload to be safe
+                                true
+                            }
+                        }
+                    },
                     None => true, // New local file
                 };
 
@@ -153,8 +234,21 @@ impl FolderSyncEngine {
                         )
                         .await
                     {
+                        // Update cache entry after successful upload
+                        updated_cache.files.insert(rel.clone(), CacheEntry {
+                            size: *size,
+                            mtime: *mtime,
+                            blake3: hash.clone(),
+                        });
                         synced_count += 1;
                     }
+                } else {
+                    // File unchanged — update cache entry to keep mtime fresh
+                    updated_cache.files.insert(rel.clone(), CacheEntry {
+                        size: *size,
+                        mtime: *mtime,
+                        blake3: hash.clone(),
+                    });
                 }
             }
         }
@@ -162,7 +256,7 @@ impl FolderSyncEngine {
         // B. Download newly created remote files to local
         for (rel, remote_size) in &remote_files {
             let need_download = match local_files.get(rel) {
-                Some((local_size, _)) => *local_size != *remote_size,
+                Some((local_size, _, _)) => *local_size != *remote_size,
                 None => true, // New remote file
             };
 
@@ -177,11 +271,16 @@ impl FolderSyncEngine {
                     .download_shared_file(peer_url, remote_folder_id, rel, &target_file_path, None)
                     .await
                 {
+                    // Invalidate cache entry since we downloaded new content
+                    updated_cache.files.remove(rel);
                     synced_count += 1;
                 }
             }
         }
 
+        // Save updated cache
+        save_sync_cache(local_path, &updated_cache);
+
         if synced_count > 0 {
             let _ = status_tx.send(SyncStatusUpdate {
                 pair_id: pair_id.to_string(),
@@ -195,7 +294,10 @@ impl FolderSyncEngine {
     }
 }
 
-fn walkdir_local(base: &Path) -> Result<Vec<(String, u64, u64)>, std::io::Error> {
+/// Walk local directory and return (rel_path, size, mtime, Option<blake3_hash>).
+/// Hash is only computed for files < 500MB to avoid stalling.
+fn walkdir_local(base: &Path) -> Result<Vec<(String, u64, u64, Option<String>)>, std::io::Error> {
+    const MAX_HASH_SIZE: u64 = 500 * 1024 * 1024; // 500 MB
     let mut results = Vec::new();
     for entry in walkdir::WalkDir::new(base).into_iter().filter_map(|e| e.ok()) {
         if entry.file_type().is_file() {
@@ -209,7 +311,14 @@ fn walkdir_local(base: &Path) -> Result<Vec<(String, u64, u64)>, std::io::Error>
                     .and_then(|t| t.duration_since(std::time::UNIX_EPOCH).ok())
                     .map(|d| d.as_secs())
                     .unwrap_or(0);
-                results.push((rel_str, size, mtime));
+
+                let hash = if size < MAX_HASH_SIZE {
+                    file_blake3(entry.path())
+                } else {
+                    None
+                };
+
+                results.push((rel_str, size, mtime, hash));
             }
         }
     }

src/transfer/protocol.rs

@@ -51,6 +51,7 @@ pub enum PrepareTransferResponse {
 pub enum TransferState {
     PendingConfirmation,
     InProgress,
+    Paused,
     Completed,
     Failed(String),
     Rejected,
@@ -71,6 +72,8 @@ pub struct TransferProgress {
     pub state: TransferState,
     #[serde(default)]
     pub checksum_verified: bool,
+    #[serde(default)]
+    pub compressed_bytes: u64, // actual bytes sent over network (after compression)
 }
 
 impl TransferProgress {

src/transfer/server.rs

@@ -422,6 +422,7 @@ async fn handle_prepare(
             speed_bps: 0,
             state: TransferState::InProgress,
             checksum_verified: false,
+                compressed_bytes: 0,
         };
 
         state.active_transfers.write().await.insert(session_id.clone(), progress.clone());
@@ -468,6 +469,7 @@ async fn handle_prepare(
             speed_bps: 0,
             state: TransferState::InProgress,
             checksum_verified: false,
+                compressed_bytes: 0,
         };
 
         state.active_transfers.write().await.insert(session_id.clone(), progress.clone());
@@ -551,8 +553,36 @@ async fn handle_upload_chunk(
         );
     }
 
-    let chunk_len = body.len();
+    let raw_length: usize = headers
-    if let Err(e) = file.write_all(&body).await {
+        .get("x-chunk-length")
+        .and_then(|v| v.to_str().ok())
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(body.len());
+
+    let is_zstd = headers
+        .get("x-compression")
+        .and_then(|v| v.to_str().ok())
+        .map(|v| v.eq_ignore_ascii_case("zstd"))
+        .unwrap_or(false);
+
+    let decompressed_data = if is_zstd {
+        match zstd::bulk::decompress(&body, raw_length.max(16 * 1024 * 1024)) {
+            Ok(decomp) => decomp,
+            Err(e) => {
+                error!("Zstd decompression failed for {}: {}", file_name, e);
+                return (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(serde_json::json!({"error": format!("Zstd decompress error: {}", e)})),
+                );
+            }
+        }
+    } else {
+        body.to_vec()
+    };
+
+    let chunk_len = decompressed_data.len();
+    let wire_bytes = body.len() as u64;
+    if let Err(e) = file.write_all(&decompressed_data).await {
         error!("Write error on {:?} at {}: {}", part_path, offset, e);
         return (
             StatusCode::INTERNAL_SERVER_ERROR,
@@ -567,6 +597,7 @@ async fn handle_upload_chunk(
         let mut transfers = state.active_transfers.write().await;
         if let Some(t) = transfers.get_mut(&session_id) {
             t.bytes_transferred = (t.bytes_transferred + chunk_len as u64).min(t.total_bytes);
+            t.compressed_bytes += wire_bytes;
             t.current_file_name = file_name;
             t.state = TransferState::InProgress;
 
@@ -715,6 +746,7 @@ async fn handle_folder_stream(
                 speed_bps: 0,
                 state: super::protocol::TransferState::Completed,
                 checksum_verified: false,
+                compressed_bytes: 0,
             };
             let _ = state.transfer_events.send(progress);
             (
@@ -977,6 +1009,7 @@ async fn handle_web_upload(
         speed_bps: 0,
         state: TransferState::InProgress,
         checksum_verified: false,
+                compressed_bytes: 0,
     };
     state.active_transfers.write().await.insert(session_id.clone(), initial_progress.clone());
     let _ = state.transfer_events.send(initial_progress);

src/ui/gui.rs

@@ -391,7 +391,7 @@ impl ZeroSendApp {
             selected_peer_ids: HashSet::new(),
             queued_files: initial_files,
             transfers: Vec::new(),
-            logs: vec!["⚡ ZeroSend v2.5.3-beta ready".to_string()],
+            logs: vec!["⚡ ZeroSend v2.5.3.1-beta ready".to_string()],
             text_input: String::new(),
             analyzed_preview: analyze_text(""),
             recipient_pin: String::new(),
@@ -3339,6 +3339,9 @@ impl ZeroSendApp {
                                     TransferState::Rejected => {
                                         ui.label(RichText::new("⛔ Передача отклонена").color(Color32::RED).size(12.0));
                                     }
+                                    TransferState::Paused => {
+                                        ui.label(RichText::new("⏸ На паузе").color(Color32::from_rgb(234, 179, 8)).strong().size(13.0));
+                                    }
                                     TransferState::Canceled => {
                                         ui.label(RichText::new("🛑 Отменено").color(theme.text_muted).size(12.0));
                                     }
@@ -3367,7 +3370,15 @@ impl ZeroSendApp {
                                     100
                                 };
 
-                                let size_details = if t.state == TransferState::InProgress {
+                                let comp_info = if t.compressed_bytes > 0 && t.compressed_bytes < t.bytes_transferred {
+                                    let saved_pct = ((t.bytes_transferred.saturating_sub(t.compressed_bytes) as f64 / t.bytes_transferred as f64) * 100.0) as u32;
+                                    let ratio = t.bytes_transferred as f64 / t.compressed_bytes.max(1) as f64;
+                                    format!(" • 🗜️ {:.1}x (сжато на {}%)", ratio, saved_pct)
+                                } else {
+                                    String::new()
+                                };
+
+                                let size_details = if t.state == TransferState::InProgress || t.state == TransferState::Paused {
                                     let speed = t.speed_bps.max(1);
                                     let remaining_bytes = t.total_bytes.saturating_sub(t.bytes_transferred);
                                     let eta_secs = remaining_bytes / speed;
@@ -3380,19 +3391,22 @@ impl ZeroSendApp {
                                     };
 
                                     let speed_mb = (t.speed_bps as f64) / 1_048_576.0;
+                                    let state_prefix = if t.state == TransferState::Paused { "⏸ На паузе • " } else { "" };
                                     format!(
-                                        "{} / {} ({}%) • ⚡ {:.1} MB/s • {}",
+                                        "{}{} / {} ({}%) • ⚡ {:.1} MB/s • {}{}",
+                                        state_prefix,
                                         human_bytes(t.bytes_transferred as f64),
                                         human_bytes(t.total_bytes as f64),
                                         progress_pct,
                                         speed_mb,
-                                        eta_str
+                                        eta_str,
+                                        comp_info
                                     )
                                 } else if is_done {
                                     if t.checksum_verified {
-                                        format!("Доставлено • Размер: {} • 🛡️ SHA-256 Проверено", human_bytes(t.total_bytes as f64))
+                                        format!("Доставлено • Размер: {}{} • 🛡️ SHA-256 Проверено", human_bytes(t.total_bytes as f64), comp_info)
                                     } else {
-                                        format!("Доставлено • Размер: {}", human_bytes(t.total_bytes as f64))
+                                        format!("Доставлено • Размер: {}{}", human_bytes(t.total_bytes as f64), comp_info)
                                     }
                                 } else {
                                     format!("Размер: {}", human_bytes(t.total_bytes as f64))
@@ -3433,6 +3447,30 @@ impl ZeroSendApp {
                                         let _ = std::process::Command::new("explorer").arg(&target_file).spawn();
                                     }
                                 });
+                            } else if is_active || t.state == TransferState::Paused {
+                                ui.with_layout(Layout::right_to_left(Align::Center), |ui| {
+                                    let client_c = self.client.clone();
+                                    let s_id = t.session_id.clone();
+                                    if t.state == TransferState::Paused {
+                                        let resume_btn = Button::new(RichText::new("▶️ Продолжить").strong().color(Color32::WHITE))
+                                            .fill(Color32::from_rgb(34, 197, 94))
+                                            .rounding(Rounding::same(6.0));
+                                        if ui.add(resume_btn).clicked() {
+                                            tokio::spawn(async move {
+                                                client_c.resume_transfer(&s_id).await;
+                                            });
+                                        }
+                                    } else {
+                                        let pause_btn = Button::new(RichText::new("⏸ Пауза").strong().color(Color32::WHITE))
+                                            .fill(Color32::from_rgb(234, 179, 8))
+                                            .rounding(Rounding::same(6.0));
+                                        if ui.add(pause_btn).clicked() {
+                                            tokio::spawn(async move {
+                                                client_c.pause_transfer(&s_id).await;
+                                            });
+                                        }
+                                    }
+                                });
                             }
                         });
 
@@ -3952,13 +3990,18 @@ impl ZeroSendApp {
                         .stroke(theme.stroke_border)
                         .inner_margin(Margin::same(14.0))
                         .show(ui, |ui| {
-                            // v2.5.3-beta
+                            // v2.5.3.1-beta
                             ui.horizontal(|ui| {
-                                ui.label(RichText::new("v2.5.3-beta").strong().color(Color32::from_rgb(34, 197, 94)));
+                                ui.label(RichText::new("v2.5.3.1-beta").strong().color(Color32::from_rgb(34, 197, 94)));
                                 ui.label(RichText::new("(Текущая версия)").size(11.0).color(Color32::GRAY));
                             });
-                            ui.label(" • ⚡ Потоковая передача папок: Zip-на-лету через tar.zst — папки стримятся напрямую без создания временных файлов на диске.");
+                            ui.label(" • 🗜️ Умная Zstd-компрессия: Автоматический пропуск уже сжатых файлов (.jpg, .mp4, .zip, .rar...) и сжатие кода/текста/документов.");
-                            ui.label(" • 🗜️ Zstandard (Zstd) сжатие: Мгновенное сжатие уровня 1-3 в потоке — до 4-8x прирост скорости на 100Mбит и VPN-каналах.");
+                            ui.label(" • 🔄 Delta-transfer для Auto-Sync: Blake3 хэширование и кэш измененных файлов — синхронизация только изменений без повторной передачи.");
+                            ui.label(" • 👥 Мульти-отправка: Параллельная передача выбранных файлов сразу нескольким друзьям.");
+                            ui.label(" • ⏸️ Пауза и возобновление: Кнопки паузы/продолжения передачи прямо в дашборде мониторинга.");
+                            ui.label(" • 🏎️ Очередь с приоритетами: Маленькие файлы передаются первыми для мгновенного завершения.");
+                            ui.label(" • 📊 Мониторинг сжатия: Отображение реального коэффициента сжатия и сэкономленного трафика.");
+                            ui.label(" • 🏷️ Умный парсер версий: Поддержка 4-значных номеров (2.5.3.1) и автоматическое определение Beta-релизов.");
                             ui.add_space(8.0);
                             ui.separator();
                             ui.add_space(8.0);
@@ -4329,6 +4372,7 @@ impl ZeroSendApp {
                                 speed_bps: 0,
                                 state: TransferState::InProgress,
                                 checksum_verified: false,
+                compressed_bytes: 0,
                             };
 
                             if let Some(pos) = self.transfers.iter().position(|x| x.session_id == session_id) {

src/ui/tui.rs

@@ -479,6 +479,7 @@ fn draw_ui(f: &mut Frame, app: &mut AppState) {
                     TransferState::Completed => "✅ Completed".to_string(),
                     TransferState::Failed(e) => format!("❌ Failed: {}", e),
                     TransferState::Rejected => "⛔ Rejected".to_string(),
+                    TransferState::Paused => "⏸ Paused".to_string(),
                     TransferState::Canceled => "🛑 Canceled".to_string(),
                 };
 

src/updater.rs

@@ -43,6 +43,8 @@ pub struct UpdateInfo {
     pub download_url: Option<String>,
     pub gitea_url: String,
     pub asset_size: u64,
+    pub is_beta: bool,
+    pub pre_number: u32,
 }
 
 #[derive(Debug, Clone)]
@@ -54,21 +56,64 @@ pub enum UpdateProgress {
     Error(String),
 }
 
-/// Parse semantic version string (e.g. "v2.4.1", "2.4.2-beta") into (u32, u32, u32)
+/// Parse semantic version string into (major, minor, patch, subpatch, is_beta, pre_num).
-pub fn parse_version(v: &str) -> (u32, u32, u32) {
+/// Handles formats like "v2.5.3", "2.5.3-beta", "2.5.3-beta.1", "2.5.3.1"
+pub fn parse_version(v: &str) -> (u32, u32, u32, u32, bool, u32) {
     let clean = v.trim().trim_start_matches('v').trim_start_matches('V');
-    let parts: Vec<&str> = clean.split('.').collect();
+
-    let major = parts.first().and_then(|s| s.split('-').next()).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+    // Split off pre-release suffix (everything after the first '-')
-    let minor = parts.get(1).and_then(|s| s.split('-').next()).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+    let (numeric_part, pre_part) = if let Some(idx) = clean.find('-') {
-    let patch = parts.get(2).and_then(|s| s.split('-').next()).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+        (&clean[..idx], Some(&clean[idx + 1..]))
-    (major, minor, patch)
+    } else {
+        (clean, None)
+    };
+
+    let num_parts: Vec<&str> = numeric_part.split('.').collect();
+    let major = num_parts.first().and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+    let minor = num_parts.get(1).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+    let patch = num_parts.get(2).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+    let subpatch = num_parts.get(3).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
+
+    let is_beta = pre_part.map(|p| {
+        let pl = p.to_lowercase();
+        pl.contains("beta") || pl.contains("alpha") || pl.contains("rc")
+    }).unwrap_or(false);
+
+    // Extract pre-release number, e.g. "beta.1" -> 1, "beta" -> 0
+    let pre_num = pre_part
+        .and_then(|p| p.split('.').last())
+        .and_then(|s| s.parse::<u32>().ok())
+        .unwrap_or(0);
+
+    (major, minor, patch, subpatch, is_beta, pre_num)
 }
 
-/// Returns true if latest version is strictly newer than current version
+/// Returns true if a version string contains "beta", "alpha", or "rc"
+pub fn is_beta_version(v: &str) -> bool {
+    let lower = v.to_lowercase();
+    lower.contains("beta") || lower.contains("alpha") || lower.contains("rc")
+}
+
+/// Returns true if latest version is strictly newer than current version.
+/// Rules: stable > beta of same numeric version; higher pre_num beats lower.
 pub fn is_newer_version(latest: &str, current: &str) -> bool {
-    let (l_maj, l_min, l_pat) = parse_version(latest);
+    let (l_maj, l_min, l_pat, l_sub, l_beta, l_pre) = parse_version(latest);
-    let (c_maj, c_min, c_pat) = parse_version(current);
+    let (c_maj, c_min, c_pat, c_sub, c_beta, c_pre) = parse_version(current);
-    (l_maj, l_min, l_pat) > (c_maj, c_min, c_pat)
+
+    // Compare numeric components first
+    let l_num = (l_maj, l_min, l_pat, l_sub);
+    let c_num = (c_maj, c_min, c_pat, c_sub);
+
+    if l_num != c_num {
+        return l_num > c_num;
+    }
+
+    // Same numeric version: stable > beta
+    match (l_beta, c_beta) {
+        (false, true) => true,   // latest is stable, current is beta → update
+        (true, false) => false,  // latest is beta, current is stable → no update
+        _ => l_pre > c_pre,      // both same prerelease type: compare pre number
+    }
 }
 
 /// Check Gitea repository for available releases or newer version tags
@@ -110,13 +155,15 @@ pub async fn check_gitea_update(api_base: Option<&str>) -> Result<UpdateInfo, St
 
                 return Ok(UpdateInfo {
                     current_version,
-                    latest_version: latest_ver,
+                    latest_version: latest_ver.clone(),
                     has_update,
                     release_name: release.name,
                     release_notes: release.body,
                     download_url,
                     gitea_url,
                     asset_size,
+                    is_beta: is_beta_version(&latest_ver),
+                    pre_number: parse_version(&latest_ver).5,
                 });
             }
         }
@@ -149,13 +196,15 @@ pub async fn check_gitea_update(api_base: Option<&str>) -> Result<UpdateInfo, St
 
                     return Ok(UpdateInfo {
                         current_version,
-                        latest_version: latest_ver,
+                        latest_version: latest_ver.clone(),
                         has_update,
                         release_name: release.name,
                         release_notes: release.body,
                         download_url,
                         gitea_url,
                         asset_size,
+                        is_beta: is_beta_version(&latest_ver),
+                        pre_number: parse_version(&latest_ver).5,
                     });
                 }
             }
@@ -182,6 +231,8 @@ pub async fn check_gitea_update(api_base: Option<&str>) -> Result<UpdateInfo, St
                                 download_url: None,
                                 gitea_url: GITEA_DEFAULT_REPO_URL.to_string(),
                                 asset_size: 0,
+                                is_beta: is_beta_version(parsed),
+                                pre_number: parse_version(parsed).5,
                             });
                         }
                     }