From 0f51dc6d4b7c814aa107974589c3ba6a4b9fd69d Mon Sep 17 00:00:00 2001
From: oblivionsage <cookieandcream560@gmail.com>
Date: Wed, 9 Jul 2025 20:08:01 +0200
Subject: [PATCH] Fix XZ file seek operation in hc_fseek()

- Implement missing XZ file seeking functionality
- Support SEEK_SET with offset 0 (rewind operation)
- Return error for unsupported arbitrary seek operations
- Follows existing gfp/ufp implementation pattern
- Resolves TODO comment on line 582 in src/filehandling.c
- Code complies with all hashcat style requirements
---
 src/filehandling.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/filehandling.c b/src/filehandling.c
index 63fc4f908..92af1f1e7 100644
--- a/src/filehandling.c
+++ b/src/filehandling.c
@@ -579,7 +579,18 @@ int hc_fseek (HCFILE *fp, off_t offset, int whence)
   }
   else if (fp->xfp)
   {
-    /* TODO */
+    /* XZ files are compressed streams, seeking is limited */
+    if (offset == 0 && whence == SEEK_SET)
+    {
+      /* Rewind to beginning */
+      hc_rewind(fp);
+      r = 0;
+    }
+    else
+    {
+      /* Arbitrary seeking not supported for compressed XZ files */
+      r = -1;
+    }
   }
 
   return r;