From 0e7def869d3df504dbb694b2ef413e4fee271d24 Mon Sep 17 00:00:00 2001
From: theubusu <80545678+theubusu@users.noreply.github.com>
Date: Thu, 22 Jan 2026 21:56:34 +0100
Subject: [PATCH] nvt_timg: add sparse support + some extra changes

---
 src/formats/nvt_timg.rs | 51 ++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 18 deletions(-)

diff --git a/src/formats/nvt_timg.rs b/src/formats/nvt_timg.rs
index a6ddf33..7739502 100644
--- a/src/formats/nvt_timg.rs
+++ b/src/formats/nvt_timg.rs
@@ -1,23 +1,36 @@
 use std::str;
 use std::path::{Path};
-use std::io::{Write};
+use std::io::{Seek, Write};
 use std::fs::{self, File, OpenOptions};
 use binrw::{BinRead, BinReaderExt};
 
 use crate::utils::common;
 use crate::utils::compression::{decompress_gzip};
+use crate::utils::sparse::{unsparse_to_file};
+
+#[derive(Debug, BinRead)]
+struct TIMG {
+    #[br(count = 4)] _magic_bytes: Vec<u8>, //TIMG
+    _unused1: u32,
+    data_size: u32,
+    _unused2: u32,
+    #[br(count = 16)] _md5_checksum: Vec<u8>,
+    #[br(count = 256)] _signature: Vec<u8>,
+}
 
 #[derive(Debug, BinRead)]
 struct PIMG {
-    #[br(count = 4)] magic_bytes: Vec<u8>,
-    _unknown1: u32,
+    #[br(count = 4)] magic_bytes: Vec<u8>, //PIMG
+    _unused1: u32,
     size: u32,
-    _unknown2: u32,
-    #[br(count = 16)] _checksum: Vec<u8>,
+    _unused2: u32,
+    #[br(count = 16)] _md5_checksum: Vec<u8>,
     #[br(count = 16)] name_bytes: Vec<u8>,
     #[br(count = 64)] dest_dev_bytes: Vec<u8>,
     #[br(count = 16)] comp_type_bytes: Vec<u8>,
-    #[br(count = 1032)] _comment: Vec<u8>,
+    _unknown1: u32,
+    #[br(count = 1024)] _comment: Vec<u8>,
+    _unknown2: u32,
 }
 impl PIMG {
     fn name(&self) -> String {
@@ -41,15 +54,14 @@ pub fn is_nvt_timg_file(file: &File) -> bool {
 }
 
 pub fn extract_nvt_timg(mut file: &File, output_folder: &str) -> Result<(), Box<dyn std::error::Error>> {
-    let _timg = common::read_exact(&mut file, 288)?; //TIMG magic + header
+    let file_size = file.metadata()?.len();
+    let timg: TIMG = file.read_le()?;
+    println!("File info:\nData size: {}", timg.data_size);
 
-    let mut pimg_i = 1;
-    loop {
-        let pimg = match file.read_le::<PIMG>() {
-            Ok(val) => val,
-            Err(_) => break, // EOF
-        };
-        //there is an old format of TIMG, this is just temporary fix to prevent false extraction until i implement it.
+    let mut pimg_i = 0;
+    while file.stream_position()? < file_size as u64 {
+        pimg_i += 1;
+        let pimg: PIMG = file.read_le()?;
         if pimg.magic_bytes != b"PIMG" {
             println!("Invalid PIMG magic!");
             return Ok(());
@@ -60,19 +72,23 @@ pub fn extract_nvt_timg(mut file: &File, output_folder: &str) -> Result<(), Box<
         println!("\n#{} - {}, Size: {}, Dest: {}, Compression: {}", pimg_i, pimg.name(), pimg.size, pimg.dest_dev(), pimg.comp_type());
 
         let out_data;
+        let output_path = Path::new(&output_folder).join(pimg.name() + ".bin");
 
         if pimg.comp_type() == "gzip" && data.starts_with(b"\x1F\x8B") { //additionally check for gzip header, because sometimes its deceptive
             println!("- Decompressing gzip...");
             out_data = decompress_gzip(&data)?;
-        } else if pimg.comp_type() == "none" {
+        } else if pimg.comp_type() == "none" || pimg.comp_type() == "" {
             out_data = data;
+        } else if pimg.comp_type() == "sparse" {
+            println!("- Unsparsing...");
+            unsparse_to_file(&data, output_path)?;
+            println!("-- Saved file!");
+            continue
         } else {
             println!("- Warning: unsupported compression type!");
             out_data = data;
         }
 
-        let output_path = Path::new(&output_folder).join(pimg.name() + ".bin");
-
         fs::create_dir_all(&output_folder)?;
         let mut out_file = OpenOptions::new()
             .write(true)
@@ -82,7 +98,6 @@ pub fn extract_nvt_timg(mut file: &File, output_folder: &str) -> Result<(), Box<
         out_file.write_all(&out_data)?;
 
         println!("-- Saved file!");
-        pimg_i += 1;
     }
 
     println!("\nExtraction finished!");