--- requirements.txt.orig	2023-06-07 19:24:42 UTC

+++ requirements.txt

@@ -1,6 +1,6 @@

 # Main requirements

 # Note that not all sub-dependencies are listed, but only ones we know could cause trouble

-sabctools==7.0.2

+sabctools==7.1.0

 cheetah3==3.2.6.post1

 cffi==1.15.1

 pycparser==2.21

--- sabnzbd/assembler.py.orig	2023-06-07 19:24:42 UTC

+++ sabnzbd/assembler.py

@@ -27,6 +27,7 @@ from threading import Thread

 import ctypes

 from typing import Tuple, Optional, List

+import sabctools

 import sabnzbd

 from sabnzbd.misc import get_all_passwords, match_str

 from sabnzbd.filesystem import (

@@ -160,13 +161,21 @@ class Assembler(Thread):

     @staticmethod

     def assemble(nzo: NzbObject, nzf: NzbFile, file_done: bool):

-        """Assemble a NZF from its table of articles

-        1) Partial write: write what we have

-        2) Nothing written before: write all

-        """

+        """Assemble a NZF from its table of articles"""

+        # When a file exists, we cannot use "w+b"

+        if os.path.exists(nzf.filepath):

+            open_mode = "r+b"

+            file_sparse = True

+        else:

+            open_mode = "w+b"

+            file_sparse = False

+

         # We write large article-sized chunks, so we can safely skip the buffering of Python

-        with open(nzf.filepath, "ab", buffering=0) as fout:

+        with open(nzf.filepath, open_mode, buffering=0) as fout:

+            # Track position, so we can prevent a seek if writing continuous

+            file_position = 0

+

             for article in nzf.decodetable:

                 # Break if deleted during writing

                 if nzo.status is Status.DELETED:

@@ -178,9 +187,25 @@ class Assembler(Thread):

                 # Write all decoded articles

                 if article.decoded:

+                    # On first write try to make the file sparse

+                    if not file_sparse and article.file_size is not None and article.file_size > 0:

+                        file_sparse = True

+                        try:

+                            sabctools.sparse(fout, article.file_size)

+                        except:

+                            logging.debug("Failed to make %s sparse with length %d", nzf.filepath, article.file_size)

+                            logging.debug("Traceback: ", exc_info=True)

+

                     data = sabnzbd.ArticleCache.load_article(article)

                     # Could be empty in case nzo was deleted

                     if data:

+                        if article.data_begin is not None:

+                            # Seek ahead if needed

+                            if article.data_begin != file_position:

+                                fout.seek(article.data_begin)

+                            file_position = article.data_begin + len(data)

+                        else:

+                            fout.seek(0, os.SEEK_END)

                         fout.write(data)

                         nzf.update_crc32(article.crc32, len(data))

                         article.on_disk = True

--- sabnzbd/constants.py.orig	2023-06-07 19:24:42 UTC

+++ sabnzbd/constants.py

@@ -49,7 +49,7 @@ RENAMES_FILE = "__renames__"

 ATTRIB_FILE = "SABnzbd_attrib"

 REPAIR_REQUEST = "repair-all.sab"

-SABCTOOLS_VERSION_REQUIRED = "7.0.2"

+SABCTOOLS_VERSION_REQUIRED = "7.1.0"

 DB_HISTORY_VERSION = 1

 DB_HISTORY_NAME = "history%s.db" % DB_HISTORY_VERSION

--- sabnzbd/decoder.py.orig	2023-06-07 19:24:42 UTC

+++ sabnzbd/decoder.py

@@ -172,7 +172,7 @@ def decode(article: Article, raw_data: bytearray):

 def decode_yenc(article: Article, data: bytearray) -> bytearray:

     # Let SABCTools do all the heavy lifting

-    yenc_filename, article.data_begin, article.data_size, crc_correct = sabctools.yenc_decode(data)

+    yenc_filename, article.file_size, article.data_begin, article.data_size, crc_correct = sabctools.yenc_decode(data)

     nzf = article.nzf

     # Assume it is yenc

--- sabnzbd/nzbstuff.py.orig	2023-06-07 19:24:42 UTC

+++ sabnzbd/nzbstuff.py

@@ -163,6 +163,7 @@ ArticleSaver = (

     "bytes",

     "lowest_partnum",

     "decoded",

+    "file_size",

     "data_begin",

     "data_size",

     "on_disk",

@@ -187,6 +188,7 @@ class Article(TryList):

         self.fetcher_priority: int = 0

         self.tries: int = 0  # Try count

         self.decoded: bool = False

+        self.file_size: Optional[int] = None

         self.data_begin: Optional[int] = None

         self.data_size: Optional[int] = None

         self.on_disk: bool = False