libudffs.h

linux下的DVD格式udf文件读取库

/*
 * libudffs.h
 *
 * Copyright (c) 2001-2002  Ben Fennema <[e-mail]>
 * All rights reserved.
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef __LIBUDFFS_H
#define __LIBUDFFS_H

#include "ecma_167.h"
#include "osta_udf.h"
#include "udf_endian.h"

#define FLAG_FREED_BITMAP		0x00000001
#define FLAG_FREED_TABLE		0x00000002
#define FLAG_UNALLOC_BITMAP		0x00000004
#define FLAG_UNALLOC_TABLE		0x00000008
#define FLAG_SPACE_BITMAP		(FLAG_FREED_BITMAP|FLAG_UNALLOC_BITMAP)
#define FLAG_SPACE_TABLE		(FLAG_FREED_TABLE|FLAG_UNALLOC_TABLE)
#define FLAG_SPACE			(FLAG_SPACE_BITMAP|FLAG_SPACE_TABLE)

#define FLAG_EFE			0x00000010

#define FLAG_UNICODE8			0x00000020
#define FLAG_UNICODE16			0x00000040
#define FLAG_UTF8			0x00000080
#define FLAG_CHARSET			(FLAG_UNICODE8|FLAG_UNICODE16|FLAG_UTF8)

#define FLAG_STRATEGY4096		0x00000100
#define FLAG_BLANK_TERMINAL		0x00000200

#define FLAG_BRIDGE			0x00000400
#define FLAG_CLOSED			0x00000800
#define FLAG_VAT			0x00001000

struct udf_extent;
struct udf_desc;
struct udf_data;

enum udf_space_type
{
	RESERVED	= 0x0001,	/* Reserved Space */
	VRS		= 0x0002,	/* Volume Recognition Sequence */
	ANCHOR		= 0x0004,	/* Anchor */
	PVDS		= 0x0008,	/* Primary Volume Descriptor Sequence */
	RVDS		= 0x0010,	/* Reserved Volume Descriptor Sequence */
	LVID		= 0x0020,	/* Logical Volume Identifier */
	STABLE		= 0x0040,	/* Sparing Table */
	SSPACE		= 0x0080,	/* Sparing Space */
	PSPACE		= 0x0100,	/* Partition Space */
	USPACE		= 0x0200,	/* Unallocated Space */
	BAD		= 0x0400,	/* Bad Blocks */
	UDF_SPACE_TYPE_SIZE = 11,
};

struct udf_sizing
{
	uint32_t	align;
	uint32_t	numSize;
	uint32_t	denomSize;
	uint32_t	minSize;
};

enum udf_alloc_type
{
	VDS_SIZE,
	LVID_SIZE,
	STABLE_SIZE,
	SSPACE_SIZE,
	PSPACE_SIZE,
	UDF_ALLOC_TYPE_SIZE,
};

struct udf_disc
{
	uint16_t			udf_rev;
	uint16_t			blocksize;
	uint8_t				blocksize_bits;
	uint32_t			flags;

	struct udf_sizing		sizing[UDF_ALLOC_TYPE_SIZE];

	int				(*write)(struct udf_disc *, struct udf_extent *);
	void				*write_data;

	struct volStructDesc		*udf_vrs[3];
	struct anchorVolDescPtr		*udf_anchor[3];
	struct primaryVolDesc		*udf_pvd[2];
	struct logicalVolDesc		*udf_lvd[2];
	struct partitionDesc		*udf_pd[2];
	struct unallocSpaceDesc		*udf_usd[2];
	struct impUseVolDesc		*udf_iuvd[2];
	struct terminatingDesc		*udf_td[2];
	struct logicalVolIntegrityDesc	*udf_lvid;

	struct sparingTable		*udf_stable[4];

	uint32_t			*vat;
	uint64_t			vat_entries;

	struct fileSetDesc		*udf_fsd;

	struct udf_extent		*head;
	struct udf_extent		*tail;
};

struct udf_extent
{
	enum udf_space_type		space_type;
	uint32_t			start;
	uint32_t			blocks;

	struct udf_desc			*head;
	struct udf_desc			*tail;

	struct udf_extent		*next;
	struct udf_extent		*prev;
};

struct udf_desc
{
	uint16_t			ident;
	uint32_t			offset;
	uint64_t			length;
	struct udf_data			*data;

	struct udf_desc			*next;
	struct udf_desc			*prev;
};

struct udf_data
{
	uint64_t			length;
	void				*buffer;
	struct udf_data			*next;
	struct udf_data			*prev;
};

/* crc.c */
extern uint16_t udf_crc(uint8_t *, uint32_t, uint16_t);

/* extent.c */
struct udf_extent *next_extent(struct udf_extent *, enum udf_space_type);
uint32_t next_extent_size(struct udf_extent *, enum udf_space_type, uint32_t, uint32_t);
struct udf_extent *prev_extent(struct udf_extent *, enum udf_space_type);
uint32_t prev_extent_size(struct udf_extent *, enum udf_space_type, uint32_t, uint32_t);
struct udf_extent *find_extent(struct udf_disc *, uint32_t);
struct udf_extent *set_extent(struct udf_disc *, enum udf_space_type, uint32_t,uint32_t);
struct udf_desc *next_desc(struct udf_desc *, uint16_t);
struct udf_desc *find_desc(struct udf_extent *, uint32_t);
struct udf_desc *set_desc(struct udf_disc *, struct udf_extent *, uint16_t, uint32_t, uint32_t, struct udf_data *);
void append_data(struct udf_desc *, struct udf_data *);
struct udf_data *alloc_data(void *, int);

/* desc.c */
inline struct impUseVolDescImpUse *query_iuvdiu(struct udf_disc *);
inline struct logicalVolIntegrityDescImpUse *query_lvidiu(struct udf_disc *);

/* file.c */
tag query_tag(struct udf_disc *, struct udf_extent *, struct udf_desc *, uint16_t);
extern tag udf_query_tag(struct udf_disc *, uint16_t, uint16_t, uint32_t, struct udf_data *, uint16_t);
extern struct udf_desc *udf_create(struct udf_disc *, struct udf_extent *, uint8_t *, uint8_t, uint32_t, struct udf_desc *, uint8_t, uint8_t, uint16_t);
extern struct udf_desc *udf_mkdir(struct udf_disc *, struct udf_extent *, uint8_t *, uint8_t, uint32_t, struct udf_desc *);
extern void insert_data(struct udf_disc *disc, struct udf_extent *pspace, struct udf_desc *desc, struct udf_data *data);
extern void insert_fid(struct udf_disc *, struct udf_extent *, struct udf_desc *, struct udf_desc *, uint8_t *, uint8_t, uint8_t);
extern int udf_alloc_blocks(struct udf_disc *, struct udf_extent *, uint32_t, uint32_t);

extern int decode_utf8(char *, char *, int);
extern int encode_utf8(char *, char *, char *, int);
extern int decode_string(struct udf_disc *, char *, char *, int);
extern int encode_string(struct udf_disc *, char *, char *, char *, int);

static inline void clear_bits(uint8_t *bitmap, uint32_t offset, uint64_t length)
{
	for (;length>0;length--)
	{
		bitmap[(length+offset-1)/8] &= ~(1 << ((offset+length-1)%8));
	}
}

#endif /* __LIBUDFFS_H */