[dl:http] implement '_http_segmented' (#8602)

gallery_dl/downloader/http.py

@@ -342,9 +342,15 @@ class HttpDownloader(DownloaderBase):
                     raise
 
                 # check file size
-                if size and fp.tell() < size:
-                    msg = f"file size mismatch ({fp.tell()} < {size})"
-                    output.stderr_write("\n")
+                if size and (fsize := fp.tell()) < size:
+                    if (segmented := kwdict.get("_http_segmented")) and \
+                            segmented is True or segmented == fsize:
+                        tries -= 1
+                        msg = "Resuming segmented download"
+                        output.stdout_write("\r")
+                    else:
+                        msg = f"file size mismatch ({fsize} < {size})"
+                        output.stderr_write("\n")
                     continue
 
             break

gallery_dl/extractor/audiochan.py

@@ -59,9 +59,13 @@ class AudiochanExtractor(Extractor):
             if self.user:
                 post["user"] = post["credits"][0]["user"]
 
+            if not (url := file["url"]):
+                post["_http_segmented"] = 600000
+                url = file["stream_url"]
+
             yield Message.Directory, post
             text.nameext_from_name(file["filename"], post)
-            yield Message.Url, file["url"] or file["stream_url"], post
+            yield Message.Url, url, post
 
     def request_api(self, endpoint, params=None):
         url = self.root_api + endpoint