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	#ifndef SPARSE_INDEX_H__
	#define SPARSE_INDEX_H__

	struct index_state;
	#define SPARSE_INDEX_MEMORY_ONLY (1 << 0)
	int is_sparse_index_allowed(struct index_state *istate, int flags);
	int convert_to_sparse(struct index_state *istate, int flags);
	void ensure_correct_sparsity(struct index_state *istate);
	void clear_skip_worktree_from_present_files(struct index_state *istate);

	/*
	* Some places in the codebase expect to search for a specific path.
	* This path might be outside of the sparse-checkout definition, in
	* which case a sparse-index may not contain a path for that index.
	*
	* Given an index and a path, check to see if a leading directory for
	* 'path' exists in the index as a sparse directory. In that case,
	* expand that sparse directory to a full range of cache entries and
	* populate the index accordingly.
	*/
	void expand_to_path(struct index_state *istate,
	const char *path, size_t pathlen, int icase);

	struct repository;
	int set_sparse_index_config(struct repository *repo, int enable);

	struct pattern_list;

	/**
	* Scan the given index and compare its entries to the given pattern list.
	* If the index is sparse and the pattern list uses cone mode patterns,
	* then modify the index to contain the all of the file entries within that
	* new pattern list. This expands sparse directories only as far as needed.
	*
	* If the pattern list is NULL or does not use cone mode patterns, then the
	* index is expanded to a full index.
	*/
	void expand_index(struct index_state istate, struct pattern_list pl);

	#endif