funai_bdp: add support for multiple keys and add more keys

src/formats/funai_bdp/include.rs

@@ -1,8 +1,6 @@
 use binrw::BinRead;
 use crate::utils::common;
 
-pub static DEC_KEY: u32 = 0x13641A98;
-
 #[derive(BinRead)]
 pub struct IndexTableEntry {
     name_bytes: [u8; 32],

src/formats/funai_bdp/mod.rs

@@ -10,27 +10,38 @@ use binrw::BinReaderExt;
 use crate::utils::common;
 use crate::formats::funai_upg::funai_des::funai_des_decrypt;
 use include::*;
+use crate::keys;
+
+pub struct FunaiBdpContext {
+    key: u32,
+}
 
 pub fn is_funai_bdp_file(app_ctx: &AppContext) -> Result<Option<Box<dyn Any>>, Box<dyn std::error::Error>> {
     let file = match app_ctx.file() {Some(f) => f, None => return Ok(None)};
     let header = common::read_file(&file, 0, 16)?;
-    let dec_header = funai_des_decrypt(&header, DEC_KEY);
 
-    if dec_header == b"index_table\x00\x00\x00\x00\x00"{
-        Ok(Some(Box::new(())))
-    } else {
-        Ok(None)
+    for key_hex in keys::FUNAI_BDP {
+        let key_bytes = hex::decode(key_hex)?;
+        let key_u32 = u32::from_le_bytes(key_bytes.as_slice().try_into()?);
+        let decrypted = funai_des_decrypt(&header, key_u32);
+
+        if decrypted == b"index_table\x00\x00\x00\x00\x00"{
+            return Ok(Some(Box::new(FunaiBdpContext {key: key_u32})))
+        }
     }
+
+    Ok(None)
 }
 
-pub fn extract_funai_bdp(app_ctx: &AppContext, _ctx: Box<dyn Any>) -> Result<(), Box<dyn std::error::Error>> {
+pub fn extract_funai_bdp(app_ctx: &AppContext, ctx: Box<dyn Any>) -> Result<(), Box<dyn std::error::Error>> {
     let mut file = app_ctx.file().ok_or("Extractor expected file")?;
+    let ctx = ctx.downcast::<FunaiBdpContext>().expect("Missing context");
 
     let mut data = Vec::new(); //to decrypt entire file
     file.read_to_end(&mut data)?;
 
     println!("Decrypting file...");
-    data = funai_des_decrypt(&data, DEC_KEY);
+    data = funai_des_decrypt(&data, ctx.key);
     let mut file_reader = Cursor::new(data);
 
     file_reader.seek(SeekFrom::Start(0x20))?;
@@ -46,15 +57,16 @@ pub fn extract_funai_bdp(app_ctx: &AppContext, _ctx: Box<dyn Any>) -> Result<(),
     for (i, entry) in entries.iter().enumerate() {
         println!("\n({}/{}) - {}, Offset: {}, Size: {}", i +1, index_entry_count, entry.name(), entry.offset, entry.size);
         
-        //at start of location there is an additional 0x20 with the entry's name
-        file_reader.seek(SeekFrom::Start(entry.offset as u64 + 0x20))?;
-        let data = common::read_exact(&mut file_reader, entry.size as usize - 0x20)?;
+        file_reader.seek(SeekFrom::Start(entry.offset as u64))?;
+        let data = common::read_exact(&mut file_reader, entry.size as usize)?;
 
         let output_path = Path::new(&app_ctx.output_dir).join(format!("{}.bin", entry.name()));
 
         fs::create_dir_all(&app_ctx.output_dir)?;
         let mut out_file = OpenOptions::new().write(true).create(true).open(output_path)?;
-        out_file.write_all(&data)?;
+
+        //at start of location there is an additional 0x20 with the entry's name
+        out_file.write_all(&data[0x20..])?;
 
         println!("-- Saved file!");
     }

src/keys.rs

@@ -108,6 +108,13 @@ pub static FUNAI_UPG: &[&str] = &[
     ("68353031"), //PHL-0SDX
 ];
 
+//Funai BDP keys
+pub static FUNAI_BDP: &[&str] = &[
+    ("981A6413"),
+    ("81AE6734"),
+    ("09E87783"),
+];
+
 //EPK keys
 //github.com/openlgtv/epk2extract
 pub static EPK: &[(&str, &str)] = &[