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        #ifndef SPLIT_INDEX_H
      
        #define SPLIT_INDEX_H
      
        struct index_state;
      
        struct strbuf;
      
        struct ewah_bitmap;
      
        struct split_index {
      
        	unsigned char base_sha1[20];
      
        	struct index_state *base;
      
        	struct ewah_bitmap *delete_bitmap;
      
        	struct ewah_bitmap *replace_bitmap;
      
        	struct cache_entry **saved_cache;
      
        	unsigned int saved_cache_nr;
      
        	unsigned int nr_deletions;
      
        	unsigned int nr_replacements;
      
        	int refcount;
      
        };
      
        struct split_index *init_split_index(struct index_state *istate);
      
        void save_or_free_index_entry(struct index_state *istate, struct cache_entry *ce);
      
        void replace_index_entry_in_base(struct index_state *istate,
      
        				 struct cache_entry *old,
      
        				 struct cache_entry *new);
      
        int read_link_extension(struct index_state *istate,
      
        			const void *data, unsigned long sz);
      
        int write_link_extension(struct strbuf *sb,
      
        			 struct index_state *istate);
      
        void move_cache_to_base_index(struct index_state *istate);
      
        void merge_base_index(struct index_state *istate);
      
        void prepare_to_write_split_index(struct index_state *istate);
      
        void finish_writing_split_index(struct index_state *istate);
      
        void discard_split_index(struct index_state *istate);
      
        void add_split_index(struct index_state *istate);
      
        void remove_split_index(struct index_state *istate);
      
        #endif