Use compression.zstd (PEP-784) (#2769)

* Use compression.zstd (PEP-784)

* Add changelog entry

CHANGELOG.md

@@ -147,6 +147,7 @@ The table below shows which release corresponds to each branch, and what date th
 - [#2735][2735] Add support for debugging with x64dbg on Windows
 - [#2767][2767] Support paginated libc.rip API requests to include all search results
 - [#2726][2726] feat(libcdb): use local debuginfod client cache before hitting servers
+- [#2769][2769] Use standard library (PEP-784) for Zstandard decompression
 
 [2675]: https://github.com/Gallopsled/pwntools/pull/2675
 [2652]: https://github.com/Gallopsled/pwntools/pull/2652
@@ -219,6 +220,7 @@ The table below shows which release corresponds to each branch, and what date th
 [2762]: https://github.com/Gallopsled/pwntools/pull/2762
 [2767]: https://github.com/Gallopsled/pwntools/pull/2767
 [2726]: https://github.com/Gallopsled/pwntools/pull/2726
+[2769]: https://github.com/Gallopsled/pwntools/pull/2769
 
 ## 4.15.1
 

pwnlib/libcdb.py

@@ -510,17 +510,12 @@ def unstrip_libc(filename):
     return True
 
 def _extract_tarfile(cache_dir, data_filename, tarball):
-    from io import BytesIO
-    import tarfile
-    # Handle zstandard compression, since tarfile only supports gz, bz2, and xz.
-    if data_filename.endswith('.zst') or data_filename.endswith('.zstd'):
-        import zstandard
-        dctx = zstandard.ZstdDecompressor()
-        decompressed_tar = BytesIO()
-        dctx.copy_stream(tarball, decompressed_tar)
-        decompressed_tar.seek(0)
-        tarball.close()
-        tarball = decompressed_tar
+    import sys
+    if sys.version_info >= (3, 14):
+        import tarfile
+    else:
+        # for zstandard support in tarfile
+        from backports.zstd import tarfile
 
     with tarfile.open(fileobj=tarball) as tar_file:
         # Find the library folder in the archive (e.g. /lib/x86_64-linux-gnu/)

pyproject.toml

@@ -50,7 +50,7 @@ dependencies = [
     "rpyc",
     "colored_traceback",
     "unix-ar",
-    "zstandard",
+    "backports.zstd>=1.0.0 ; python_version<'3.14'",
 ]
 
 [project.urls]