diff --git a/src/backup.rs b/src/backup.rs
index 232a9330..ce6d5922 100644
--- a/src/backup.rs
+++ b/src/backup.rs
@@ -146,6 +146,9 @@ pub use data_blob_reader::*;
 mod data_blob_writer;
 pub use data_blob_writer::*;
 
+mod catalog_blob;
+pub use catalog_blob::*;
+
 mod chunk_stream;
 pub use chunk_stream::*;
 
diff --git a/src/backup/catalog_blob.rs b/src/backup/catalog_blob.rs
new file mode 100644
index 00000000..0d53b3de
--- /dev/null
+++ b/src/backup/catalog_blob.rs
@@ -0,0 +1,225 @@
+use failure::*;
+use std::sync::Arc;
+use std::ffi::{CStr, CString};
+use std::io::{Read, BufRead, BufReader, Write, Seek};
+use std::convert::TryFrom;
+
+use chrono::offset::{TimeZone, Local};
+
+use proxmox::tools::io::ReadExt;
+
+use crate::pxar::catalog::{BackupCatalogWriter, CatalogEntryType};
+
+use super::{DataBlobWriter, DataBlobReader, CryptConfig};
+
+pub struct CatalogBlobWriter<W: Write + Seek> {
+    writer: DataBlobWriter<W>,
+    level: usize,
+}
+
+impl <W: Write + Seek> CatalogBlobWriter<W> {
+    pub fn new_compressed(writer: W) -> Result<Self, Error> {
+        let writer = DataBlobWriter::new_compressed(writer)?;
+        Ok(Self { writer, level: 0 })
+    }
+    pub fn new_signed_compressed(writer: W, config: Arc<CryptConfig>) -> Result<Self, Error> {
+        let writer = DataBlobWriter::new_signed_compressed(writer, config)?;
+        Ok(Self { writer, level: 0 })
+    }
+    pub fn new_encrypted_compressed(writer: W, config: Arc<CryptConfig>) -> Result<Self, Error> {
+        let writer = DataBlobWriter::new_encrypted_compressed(writer, config)?;
+        Ok(Self { writer, level: 0 })
+    }
+    pub fn finish(self) -> Result<W, Error> {
+        self.writer.finish()
+    }
+}
+
+impl <W: Write + Seek> BackupCatalogWriter for CatalogBlobWriter<W> {
+
+    fn start_directory(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::Directory as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        self.writer.write(b"{")?;
+        self.level += 1;
+        Ok(())
+    }
+
+    fn end_directory(&mut self) -> Result<(), Error> {
+        if self.level == 0 {
+            bail!("got unexpected end_directory level 0");
+        }
+        self.writer.write(b"}")?;
+        self.level -= 1;
+        Ok(())
+    }
+
+    fn add_file(&mut self, name: &CStr, size: u64, mtime: u64) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::File as u8])?;
+        self.writer.write(&size.to_le_bytes())?;
+        self.writer.write(&mtime.to_le_bytes())?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_symlink(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::Symlink as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_hardlink(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::Hardlink as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_block_device(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::BlockDevice as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_char_device(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::CharDevice as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_fifo(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::Fifo as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+
+    fn add_socket(&mut self, name: &CStr) -> Result<(), Error> {
+        self.writer.write(&[CatalogEntryType::Socket as u8])?;
+        self.writer.write(name.to_bytes_with_nul())?;
+        Ok(())
+    }
+}
+
+
+pub struct CatalogBlobReader<R: Read + BufRead> {
+    reader: BufReader<DataBlobReader<R>>,
+    dir_stack: Vec<CString>,
+}
+
+impl <R: Read + BufRead> CatalogBlobReader<R> {
+
+    pub fn new(reader: R, crypt_config: Option<Arc<CryptConfig>>) -> Result<Self, Error> {
+        let dir_stack = Vec::new();
+
+        let reader = BufReader::new(DataBlobReader::new(reader, crypt_config)?);
+
+        Ok(Self { reader, dir_stack })
+    }
+
+    fn read_filename(&mut self) ->  Result<std::ffi::CString, Error> {
+        let mut filename = Vec::new();
+        self.reader.read_until(0u8, &mut filename)?;
+        if filename.len() > 0 && filename[filename.len()-1] == 0u8 {
+            filename.pop();
+        }
+        if filename.len() == 0 {
+            bail!("got zero length filename");
+        }
+        if filename.iter().find(|b| **b == b'/').is_some() {
+            bail!("found invalid filename with slashes.");
+        }
+        Ok(unsafe { CString::from_vec_unchecked(filename) })
+    }
+
+    fn next_byte(&mut self) ->  Result<u8, std::io::Error> {
+        let mut buf = [0u8; 1];
+        self.reader.read_exact(&mut buf)?;
+        Ok(buf[0])
+    }
+
+    fn expect_next(&mut self, expect: u8) -> Result<(), Error> {
+        let next = self.next_byte()?;
+        if next != expect {
+            bail!("got unexpected byte ({} != {})", next, expect);
+        }
+        Ok(())
+    }
+
+    fn print_entry(&self, etype: CatalogEntryType, filename: &CStr, size: u64, mtime: u64)  -> Result<(), Error> {
+        let mut out = Vec::new();
+
+        write!(out, "{} ", char::from(etype as u8))?;
+
+        for name in &self.dir_stack {
+            out.extend(name.to_bytes());
+            out.push(b'/');
+        }
+
+        out.extend(filename.to_bytes());
+
+        let dt = Local.timestamp(mtime as i64, 0);
+
+        if etype == CatalogEntryType::File {
+            write!(out, " {} {}", size, dt.to_rfc3339_opts(chrono::SecondsFormat::Secs, false))?;
+        }
+
+        write!(out, "\n")?;
+        std::io::stdout().write_all(&out)?;
+
+        Ok(())
+    }
+
+    fn parse_entries(&mut self) ->  Result<(), Error> {
+
+        loop {
+            let etype = match self.next_byte() {
+                Ok(v) => v,
+                Err(err) => {
+                    if err.kind() == std::io::ErrorKind::UnexpectedEof {
+                        if self.dir_stack.len() == 0 {
+                            break;
+                        }
+                    }
+                    return Err(err.into());
+                }
+            };
+            if etype == b'}' {
+                if self.dir_stack.pop().is_none() {
+                    bail!("got unexpected '}'");
+                }
+                break;
+            }
+
+            let etype = CatalogEntryType::try_from(etype)?;
+            match etype {
+                CatalogEntryType::Directory => {
+                    let filename = self.read_filename()?;
+                    self.print_entry(etype.into(), &filename, 0, 0)?;
+                    self.dir_stack.push(filename);
+                    self.expect_next(b'{')?;
+                    self.parse_entries()?;
+                }
+                CatalogEntryType::File => {
+                    let size = unsafe { self.reader.read_le_value::<u64>()? };
+                    let mtime = unsafe { self.reader.read_le_value::<u64>()? };
+                    let filename = self.read_filename()?;
+                    self.print_entry(etype.into(), &filename, size, mtime)?;
+                }
+                CatalogEntryType::Symlink |
+                CatalogEntryType::Hardlink |
+                CatalogEntryType::Fifo |
+                CatalogEntryType::Socket |
+                CatalogEntryType::BlockDevice |
+                CatalogEntryType::CharDevice => {
+                    let filename = self.read_filename()?;
+                    self.print_entry(etype.into(), &filename, 0, 0)?;
+                }
+            }
+        }
+        Ok(())
+    }
+
+    pub fn dump(&mut self) -> Result<(), Error> {
+        self.parse_entries()?;
+        Ok(())
+    }
+}
diff --git a/src/bin/proxmox-backup-client.rs b/src/bin/proxmox-backup-client.rs
index 9b5082d1..f726008b 100644
--- a/src/bin/proxmox-backup-client.rs
+++ b/src/bin/proxmox-backup-client.rs
@@ -159,7 +159,7 @@ fn backup_directory<P: AsRef<Path>>(
     verbose: bool,
     skip_lost_and_found: bool,
     crypt_config: Option<Arc<CryptConfig>>,
-    catalog: Arc<Mutex<SimpleCatalog>>,
+    catalog: Arc<Mutex<CatalogBlobWriter<std::fs::File>>>,
 ) -> Result<BackupStats, Error> {
 
     let pxar_stream = PxarBackupStream::open(dir_path.as_ref(), device_set, verbose, skip_lost_and_found, catalog)?;
@@ -457,9 +457,8 @@ fn dump_catalog(
 
     blob_file.seek(SeekFrom::Start(0))?;
 
-    let reader = BufReader::new(DataBlobReader::new(blob_file, crypt_config)?);
-
-    let mut catalog_reader = pxar::catalog::SimpleCatalogReader::new(reader);
+    let reader = BufReader::new(blob_file);
+    let mut catalog_reader = CatalogBlobReader::new(reader, crypt_config)?;
 
     catalog_reader.dump()?;
 
@@ -677,8 +676,14 @@ fn create_backup(
 
     let mut file_list = vec![];
 
-    let catalog_filename = format!("/tmp/pbs-catalog-{}.cat", std::process::id());
-    let catalog = Arc::new(Mutex::new(SimpleCatalog::new(&catalog_filename)?));
+    // fixme: encrypt/sign catalog?
+     let catalog_file = std::fs::OpenOptions::new()
+        .write(true)
+        .read(true)
+        .custom_flags(libc::O_TMPFILE)
+        .open("/tmp")?;
+
+    let catalog = Arc::new(Mutex::new(CatalogBlobWriter::new_compressed(catalog_file)?));
     let mut upload_catalog = false;
 
     for (backup_type, filename, target, size) in upload_list {
@@ -731,13 +736,14 @@ fn create_backup(
     if upload_catalog {
         let mutex = Arc::try_unwrap(catalog)
             .map_err(|_| format_err!("unable to get catalog (still used)"))?;
-        drop(mutex); // close catalog
+        let mut catalog_file = mutex.into_inner().unwrap().finish()?;
 
         let target = "catalog.blob";
-        let stats = client.upload_blob_from_file(&catalog_filename, target, crypt_config.clone(), true).wait()?;
-        file_list.push((target.to_owned(), stats));
 
-        let _ = std::fs::remove_file(&catalog_filename);
+        catalog_file.seek(SeekFrom::Start(0))?;
+
+        let stats = client.upload_blob(catalog_file, target).wait()?;
+        file_list.push((target.to_owned(), stats));
     }
 
     if let Some(rsa_encrypted_key) = rsa_encrypted_key {
diff --git a/src/bin/pxar.rs b/src/bin/pxar.rs
index d4770171..0f80d94d 100644
--- a/src/bin/pxar.rs
+++ b/src/bin/pxar.rs
@@ -209,7 +209,7 @@ fn create_archive(
         feature_flags ^= pxar::flags::WITH_SOCKETS;
     }
 
-    let catalog = None::<&mut pxar::catalog::SimpleCatalog>;
+    let catalog = None::<&mut pxar::catalog::DummyCatalogWriter>;
     pxar::Encoder::encode(source, &mut dir, &mut writer, catalog, devices, verbose, false, feature_flags)?;
 
     writer.flush()?;
diff --git a/src/client/http_client.rs b/src/client/http_client.rs
index ab68582a..a190ce53 100644
--- a/src/client/http_client.rs
+++ b/src/client/http_client.rs
@@ -626,6 +626,33 @@ impl BackupClient {
         self.canceller.cancel();
     }
 
+    pub fn upload_blob<R: std::io::Read>(
+        &self,
+        mut reader: R,
+        file_name: &str,
+     ) -> impl Future<Item=BackupStats, Error=Error> {
+
+        let h2 = self.h2.clone();
+        let file_name = file_name.to_owned();
+
+        futures::future::ok(())
+            .and_then(move |_| {
+                let mut raw_data = Vec::new();
+                // fixme: avoid loading into memory
+                reader.read_to_end(&mut raw_data)?;
+                Ok(raw_data)
+            })
+            .and_then(move |raw_data| {
+                let csum = openssl::sha::sha256(&raw_data);
+                let param = json!({"encoded-size": raw_data.len(), "file-name": file_name });
+                let size = raw_data.len() as u64; // fixme: should be decoded size instead??
+                h2.upload("blob", Some(param), raw_data)
+                    .map(move |_| {
+                        BackupStats { size, csum }
+                    })
+            })
+    }
+
     pub fn upload_blob_from_data(
         &self,
         data: Vec<u8>,
diff --git a/src/client/pxar_backup_stream.rs b/src/client/pxar_backup_stream.rs
index 7db60bd3..0e837991 100644
--- a/src/client/pxar_backup_stream.rs
+++ b/src/client/pxar_backup_stream.rs
@@ -1,5 +1,5 @@
 use failure::*;
-
+use std::io::{Write, Seek};
 use std::thread;
 use std::sync::{Arc, Mutex};
 use std::os::unix::io::FromRawFd;
@@ -14,6 +14,8 @@ use nix::sys::stat::Mode;
 use nix::dir::Dir;
 
 use crate::pxar;
+use crate::backup::CatalogBlobWriter;
+
 use crate::tools::wrapped_reader_stream::WrappedReaderStream;
 
 /// Stream implementation to encode and upload .pxar archives.
@@ -37,13 +39,13 @@ impl Drop for PxarBackupStream {
 
 impl PxarBackupStream {
 
-    pub fn new(
+    pub fn new<W: Write + Seek + Send + 'static>(
         mut dir: Dir,
         path: PathBuf,
         device_set: Option<HashSet<u64>>,
         verbose: bool,
         skip_lost_and_found: bool,
-        catalog: Arc<Mutex<crate::pxar::catalog::SimpleCatalog>>,
+        catalog: Arc<Mutex<CatalogBlobWriter<W>>>,
     ) -> Result<Self, Error> {
 
         let (rx, tx) = nix::unistd::pipe()?;
@@ -74,12 +76,12 @@ impl PxarBackupStream {
         })
     }
 
-    pub fn open(
+    pub fn open<W: Write + Seek + Send + 'static>(
         dirname: &Path,
         device_set: Option<HashSet<u64>>,
         verbose: bool,
         skip_lost_and_found: bool,
-        catalog: Arc<Mutex<crate::pxar::catalog::SimpleCatalog>>,
+        catalog: Arc<Mutex<CatalogBlobWriter<W>>>,
     ) -> Result<Self, Error> {
 
         let dir = nix::dir::Dir::open(dirname, OFlag::O_DIRECTORY, Mode::empty())?;
diff --git a/src/pxar/catalog.rs b/src/pxar/catalog.rs
index 1a6449ac..fa2db236 100644
--- a/src/pxar/catalog.rs
+++ b/src/pxar/catalog.rs
@@ -1,18 +1,11 @@
-//! File list Catalog
+//! Trait for file list catalog
 //!
 //! A file list catalog simply store a directory tree. Such catalogs
 //! may be used as index to do a fast search for files.
 
 use failure::*;
-
-use std::io::{Read, BufRead, Write};
 use std::convert::TryFrom;
-
-use std::ffi::{CStr, CString};
-
-use chrono::offset::{TimeZone, Local};
-
-use proxmox::tools::io::ReadExt;
+use std::ffi::CStr;
 
 #[repr(u8)]
 #[derive(Copy,Clone,PartialEq)]
@@ -57,204 +50,16 @@ pub trait BackupCatalogWriter {
     fn add_socket(&mut self, name: &CStr) -> Result<(), Error>;
 }
 
-pub struct SimpleCatalog {
-    writer: std::fs::File,
-    level: usize,
-}
-
-impl SimpleCatalog {
-    pub fn new<P: AsRef<std::path::Path>>(path: P) -> Result<Self, Error> {
-        let writer = std::fs::OpenOptions::new()
-            .create(true)
-            .truncate(true)
-            .write(true)
-            .open(path.as_ref())?;
-
-        Ok(Self { writer, level: 0 })
-    }
-}
-
-impl BackupCatalogWriter for SimpleCatalog {
-
-    fn start_directory(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::Directory as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        self.writer.write(b"{")?;
-        self.level += 1;
-        Ok(())
-    }
-
-    fn end_directory(&mut self) -> Result<(), Error> {
-        if self.level == 0 {
-            bail!("got unexpected end_directory level 0");
-        }
-        self.writer.write(b"}")?;
-        self.level -= 1;
-        Ok(())
-    }
-
-    fn add_file(&mut self, name: &CStr, size: u64, mtime: u64) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::File as u8])?;
-        self.writer.write(&size.to_le_bytes())?;
-        self.writer.write(&mtime.to_le_bytes())?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_symlink(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::Symlink as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_hardlink(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::Hardlink as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_block_device(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::BlockDevice as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_char_device(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::CharDevice as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_fifo(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::Fifo as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-
-    fn add_socket(&mut self, name: &CStr) -> Result<(), Error> {
-        self.writer.write(&[CatalogEntryType::Socket as u8])?;
-        self.writer.write(name.to_bytes_with_nul())?;
-        Ok(())
-    }
-}
-
-pub struct SimpleCatalogReader<R> {
-    reader: R,
-    dir_stack: Vec<CString>,
-}
-
-impl <R: Read + BufRead> SimpleCatalogReader<R> {
-
-    pub fn new(reader: R) -> Self {
-        let dir_stack = Vec::new();
-        Self { reader, dir_stack }
-    }
-
-    fn read_filename(&mut self) ->  Result<std::ffi::CString, Error> {
-        let mut filename = Vec::new();
-        self.reader.read_until(0u8, &mut filename)?;
-        if filename.len() > 0 && filename[filename.len()-1] == 0u8 {
-            filename.pop();
-        }
-        if filename.len() == 0 {
-            bail!("got zero length filename");
-        }
-        if filename.iter().find(|b| **b == b'/').is_some() {
-            bail!("found invalid filename with slashes.");
-        }
-        Ok(unsafe { CString::from_vec_unchecked(filename) })
-    }
-
-    fn next_byte(&mut self) ->  Result<u8, std::io::Error> {
-        let mut buf = [0u8; 1];
-        self.reader.read_exact(&mut buf)?;
-        Ok(buf[0])
-    }
-
-    fn expect_next(&mut self, expect: u8) -> Result<(), Error> {
-        let next = self.next_byte()?;
-        if next != expect {
-            bail!("got unexpected byte ({} != {})", next, expect);
-        }
-        Ok(())
-    }
-
-    fn print_entry(&self, etype: CatalogEntryType, filename: &CStr, size: u64, mtime: u64)  -> Result<(), Error> {
-        let mut out = Vec::new();
-
-        write!(out, "{} ", char::from(etype as u8))?;
-
-        for name in &self.dir_stack {
-            out.extend(name.to_bytes());
-            out.push(b'/');
-        }
-
-        out.extend(filename.to_bytes());
-
-        let dt = Local.timestamp(mtime as i64, 0);
-
-        if etype == CatalogEntryType::File {
-            write!(out, " {} {}", size, dt.to_rfc3339_opts(chrono::SecondsFormat::Secs, false))?;
-        }
-
-        write!(out, "\n")?;
-        std::io::stdout().write_all(&out)?;
-
-        Ok(())
-    }
-
-    fn parse_entries(&mut self) ->  Result<(), Error> {
-
-        loop {
-            let etype = match self.next_byte() {
-                Ok(v) => v,
-                Err(err) => {
-                    if err.kind() == std::io::ErrorKind::UnexpectedEof {
-                        if self.dir_stack.len() == 0 {
-                            break;
-                        }
-                    }
-                    return Err(err.into());
-                }
-            };
-            if etype == b'}' {
-                if self.dir_stack.pop().is_none() {
-                    bail!("got unexpected '}'");
-                }
-                break;
-            }
-
-            let etype = CatalogEntryType::try_from(etype)?;
-            match etype {
-                CatalogEntryType::Directory => {
-                    let filename = self.read_filename()?;
-                    self.print_entry(etype.into(), &filename, 0, 0)?;
-                    self.dir_stack.push(filename);
-                    self.expect_next(b'{')?;
-                    self.parse_entries()?;
-                }
-                CatalogEntryType::File => {
-                    let size = unsafe { self.reader.read_le_value::<u64>()? };
-                    let mtime = unsafe { self.reader.read_le_value::<u64>()? };
-                    let filename = self.read_filename()?;
-                    self.print_entry(etype.into(), &filename, size, mtime)?;
-                }
-                CatalogEntryType::Symlink |
-                CatalogEntryType::Hardlink |
-                CatalogEntryType::Fifo |
-                CatalogEntryType::Socket |
-                CatalogEntryType::BlockDevice |
-                CatalogEntryType::CharDevice => {
-                    let filename = self.read_filename()?;
-                    self.print_entry(etype.into(), &filename, 0, 0)?;
-                }
-            }
-        }
-        Ok(())
-    }
-
-    pub fn dump(&mut self) -> Result<(), Error> {
-        self.parse_entries()?;
-        Ok(())
-    }
+pub struct DummyCatalogWriter();
+
+impl BackupCatalogWriter for DummyCatalogWriter {
+    fn start_directory(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn end_directory(&mut self) -> Result<(), Error> { Ok(()) }
+    fn add_file(&mut self, _name: &CStr, _size: u64, _mtime: u64) -> Result<(), Error> { Ok(()) }
+    fn add_symlink(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn add_hardlink(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn add_block_device(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn add_char_device(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn add_fifo(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
+    fn add_socket(&mut self, _name: &CStr) -> Result<(), Error> { Ok(()) }
 }
diff --git a/tests/catar.rs b/tests/catar.rs
index 46b82f17..fdbb7135 100644
--- a/tests/catar.rs
+++ b/tests/catar.rs
@@ -26,7 +26,7 @@ fn run_test(dir_name: &str) -> Result<(), Error> {
 
     let path = std::path::PathBuf::from(dir_name);
 
-    let catalog = None::<&mut catalog::SimpleCatalog>;
+    let catalog = None::<&mut catalog::DummyCatalogWriter>;
     Encoder::encode(path, &mut dir, &mut writer, catalog, None, false, false, flags::DEFAULT)?;
 
     Command::new("cmp")