From a86775f6175460ea6ceb963567000c2b6e7002fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mike=20F=C3=A4hrmann?= <mike_faehrmann@web.de>
Date: Thu, 4 Jan 2024 15:05:33 +0100
Subject: [PATCH] [gelbooru] fix 'favorite' extractor (#4903)

lots of +1/-1 and </<= mistakes
---
 gallery_dl/extractor/gelbooru.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/gallery_dl/extractor/gelbooru.py b/gallery_dl/extractor/gelbooru.py
index b62ff78b..d9da7bc3 100644
--- a/gallery_dl/extractor/gelbooru.py
+++ b/gallery_dl/extractor/gelbooru.py
@@ -165,15 +165,16 @@ class GelbooruFavoriteExtractor(GelbooruBase,
             "id"   : self.favorite_id,
             "limit": "1",
         }
-        count = self._api_request(params, "@attributes")[0]["count"]
 
+        count = self._api_request(params, "@attributes")[0]["count"]
         if count <= self.offset:
             return
-        pnum, last = divmod(count + 1, self.per_page)
 
-        if self.offset >= last:
+        pnum, last = divmod(count-1, self.per_page)
+        if self.offset > last:
+            # page number change
             self.offset -= last
-            diff, self.offset = divmod(self.offset, self.per_page)
+            diff, self.offset = divmod(self.offset-1, self.per_page)
             pnum -= diff + 1
         skip = self.offset
 
@@ -183,8 +184,8 @@ class GelbooruFavoriteExtractor(GelbooruBase,
 
         while True:
             favs = self._api_request(params, "favorite")
-
             favs.reverse()
+
             if skip:
                 favs = favs[skip:]
                 skip = 0