Fix 11 Gitea issues (#29, #30, #31, #35, #38, #41, #42, #43, #44, #45, #46)

#29 - compression_level now used in data_compress()
#30 - chunk_size no longer truncated to 32-bit
#31 - chmod/chown failures now logged
#35 - strtok -> strtok_r for thread safety
#38 - open_next_directory returns -1 on opendir failure
#41 - file_send_sendfile uses compression_level param
#42 - dirname() uses copy to avoid modifying input
#43 - delete_extras_walk checks manifest before rmdir
#44 - server_host/port moved into Config struct
#45 - SSH parse_remote_dest uses dynamic allocation
#46 - send_chunk refactored, reduced nesting/duplication

src/shared/utils.c

@@ -26,7 +26,8 @@ bool mkdir_r(const char* path) {
     path_current[0] = '\0';
   }
   const char* delimiter = "/";
-  const char* part = strtok(path_duplicate, delimiter);
+  char* saveptr;
+  const char* part = strtok_r(path_duplicate, delimiter, &saveptr);
   bool ok = true;
   while (part != NULL) {
     strcpy(path_current_position, part);
@@ -41,7 +42,7 @@ bool mkdir_r(const char* path) {
         break;
       }
     }
-    part = strtok(NULL, delimiter);
+    part = strtok_r(NULL, delimiter, &saveptr);
   }
   free(path_duplicate);
   free(path_current);
@@ -81,10 +82,22 @@ bool glob_match(const char* pattern, const char* str) {
   return *str == '\0';
 }
 
+static bool is_dir_in_manifest(const char* rel_path, ArrayList* manifest) {
+  size_t len = strlen(rel_path);
+  for (int i = 0; i < manifest->size; i++) {
+    const char* entry = (const char*)manifest->items[i];
+    // Check if entry starts with rel_path + '/'
+    if (strncmp(entry, rel_path, len) == 0 && entry[len] == '/')
+      return true;
+  }
+  return false;
+}
+
 static void delete_extras_walk(const char* abs_path, const char* rel_path, ArrayList* manifest) {
   DIR* dir = opendir(abs_path);
   if (!dir)
     return;
+  bool all_removed = true;
   struct dirent* entry;
   while ((entry = readdir(dir)) != NULL) {
     if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
@@ -99,6 +112,10 @@ static void delete_extras_walk(const char* abs_path, const char* rel_path, Array
     }
     if (S_ISDIR(st.st_mode)) {
       delete_extras_walk(child_abs, child_rel, manifest);
+      // After recursion, try to remove the subdirectory if it's now empty
+      if (rmdir(child_abs) != 0) {
+        all_removed = false;
+      }
     } else {
       // Check if relative path is in manifest
       bool found = false;
@@ -111,13 +128,19 @@ static void delete_extras_walk(const char* abs_path, const char* rel_path, Array
       if (!found) {
         unlink(child_abs);
         fprintf(stderr, "  Deleted: %s\n", child_rel);
+      } else {
+        all_removed = false;
       }
     }
     free(child_abs);
     free(child_rel);
   }
   closedir(dir);
-  rmdir(abs_path);
+  // Only remove the directory itself if it is not in the manifest
+  // and contained no kept entries.
+  if (all_removed && rel_path[0] != '\0' && !is_dir_in_manifest(rel_path, manifest)) {
+    rmdir(abs_path);
+  }
 }
 
 void delete_extras(const char* dest_root, ArrayList* manifest) {