/* fshelp.h -- Filesystem helper functions */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2004,2005,2006,2007,2008  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRUB_FSHELP_HEADER
#define GRUB_FSHELP_HEADER	1

#include <grub/types.h>
#include <grub/symbol.h>
#include <grub/err.h>
#include <grub/disk.h>

typedef struct grub_fshelp_node* grub_fshelp_node_t;

#define GRUB_FSHELP_CASE_INSENSITIVE	0x100
#define GRUB_FSHELP_TYPE_MASK	0xff
#define GRUB_FSHELP_FLAGS_MASK	0x100

enum grub_fshelp_filetype
{
	GRUB_FSHELP_UNKNOWN,
	GRUB_FSHELP_REG,
	GRUB_FSHELP_DIR,
	GRUB_FSHELP_SYMLINK
};

typedef int (*grub_fshelp_iterate_dir_hook_t) (const char* filename,
	enum grub_fshelp_filetype filetype,
	grub_fshelp_node_t node,
	void* data);

/* Lookup the node PATH.  The node ROOTNODE describes the root of the
   directory tree.  The node found is returned in FOUNDNODE, which is
   either a ROOTNODE or a new malloc'ed node.  ITERATE_DIR is used to
   iterate over all directory entries in the current node.
   READ_SYMLINK is used to read the symlink if a node is a symlink.
   EXPECTTYPE is the type node that is expected by the called, an
   error is generated if the node is not of the expected type.  */
grub_err_t
EXPORT_FUNC(grub_fshelp_find_file) (const char* path,
	grub_fshelp_node_t rootnode,
	grub_fshelp_node_t* foundnode,
	int (*iterate_dir) (grub_fshelp_node_t dir,
		grub_fshelp_iterate_dir_hook_t hook,
		void* hook_data),
	char* (*read_symlink) (grub_fshelp_node_t node),
	enum grub_fshelp_filetype expect);


grub_err_t
EXPORT_FUNC(grub_fshelp_find_file_lookup) (const char* path,
	grub_fshelp_node_t rootnode,
	grub_fshelp_node_t* foundnode,
	grub_err_t(*lookup_file) (grub_fshelp_node_t dir,
		const char* name,
		grub_fshelp_node_t* foundnode,
		enum grub_fshelp_filetype* foundtype),
	char* (*read_symlink) (grub_fshelp_node_t node),
	enum grub_fshelp_filetype expect);

/* Read LEN bytes from the file NODE on disk DISK into the buffer BUF,
   beginning with the block POS.  READ_HOOK should be set before
   reading a block from the file.  GET_BLOCK is used to translate file
   blocks to disk blocks.  The file is FILESIZE bytes big and the
   blocks have a size of LOG2BLOCKSIZE (in log2).  */
grub_ssize_t
EXPORT_FUNC(grub_fshelp_read_file) (grub_disk_t disk, grub_fshelp_node_t node,
	grub_disk_read_hook_t read_hook,
	void* read_hook_data,
	grub_off_t pos, grub_size_t len, char* buf,
	grub_disk_addr_t(*get_block) (grub_fshelp_node_t node,
		grub_disk_addr_t block),
	grub_off_t filesize, int log2blocksize,
	grub_disk_addr_t blocks_start);

#endif /* ! GRUB_FSHELP_HEADER */
