fs/hfsplus/blockiter.h

/*
 * libhfs - library for reading and writing Macintosh HFS volumes
 *
 * The iterator shown here iterates over the blocks of a fork.
 * 
 * Copyright (C) 2000 Klaus Halfmann <klaus.halfmann@feri.de>
 * Original work by 1996-1998 Robert Leslie <rob@mars.org>
 * other work 2000 from Brad Boyer (flar@pants.nu)  
 *
 * 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.
 *
 */

/*  Structure of the blockiterator */
typedef struct 
{
    volume*         vol;        // volume we iterate over
    UInt32          curr_block; // current, absolute block
    UInt32          block;      // relative block in current extent
    UInt32          max_block;  // Maximum allowed block
    UInt32          fileId;     // id of file we iterate over
    int             index;      // 0 .. 7 in current extent
    hfsp_extent*    file;       // original extent record from file
    hfsp_extent*    e;          // current extentent under examination
    UInt8           forktype;   // type of fork we iterate over
    UInt8           in_extent;  // boolean  0 - in file extent
                                //          1 - in extents file
    extent_record   er;         // record to iterate in extents file. 
} blockiter;

/* Initialize iterator for a given fork */
extern void blockiter_init(blockiter* b, volume* vol, hfsp_fork_raw* f, 
                            UInt8 forktype, UInt32 fileId);

/* find next block of the fork iterating over */
extern int blockiter_next(blockiter *b);

/* skip the indicated number of blocks */
extern int blockiter_skip(blockiter *b, UInt32 skip);

/* return current block */
static inline UInt32 blockiter_curr(blockiter *b)
{
    return b->e->start_block + b->block;
}


1	dpavlin	1	/*
2			* libhfs - library for reading and writing Macintosh HFS volumes
3			*
4			* The iterator shown here iterates over the blocks of a fork.
5			*
6			* Copyright (C) 2000 Klaus Halfmann <klaus.halfmann@feri.de>
7			* Original work by 1996-1998 Robert Leslie <rob@mars.org>
8			* other work 2000 from Brad Boyer (flar@pants.nu)
9			*
10			* This program is free software; you can redistribute it and/or modify
11			* it under the terms of the GNU General Public License as published by
12			* the Free Software Foundation; either version 2 of the License, or
13			* (at your option) any later version.
14			*
15			* This program is distributed in the hope that it will be useful,
16			* but WITHOUT ANY WARRANTY; without even the implied warranty of
17			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18			* GNU General Public License for more details.
19			*
20			* You should have received a copy of the GNU General Public License
21			* along with this program; if not, write to the Free Software
22			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23			*
24			*/
25
26			/* Structure of the blockiterator */
27			typedef struct
28			{
29			volume* vol; // volume we iterate over
30			UInt32 curr_block; // current, absolute block
31			UInt32 block; // relative block in current extent
32			UInt32 max_block; // Maximum allowed block
33			UInt32 fileId; // id of file we iterate over
34			int index; // 0 .. 7 in current extent
35			hfsp_extent* file; // original extent record from file
36			hfsp_extent* e; // current extentent under examination
37			UInt8 forktype; // type of fork we iterate over
38			UInt8 in_extent; // boolean 0 - in file extent
39			// 1 - in extents file
40			extent_record er; // record to iterate in extents file.
41			} blockiter;
42
43			/* Initialize iterator for a given fork */
44			extern void blockiter_init(blockiter* b, volume* vol, hfsp_fork_raw* f,
45			UInt8 forktype, UInt32 fileId);
46
47			/* find next block of the fork iterating over */
48			extern int blockiter_next(blockiter *b);
49
50			/* skip the indicated number of blocks */
51			extern int blockiter_skip(blockiter *b, UInt32 skip);
52
53			/* return current block */
54			static inline UInt32 blockiter_curr(blockiter *b)
55			{
56			return b->e->start_block + b->block;
57			}
58
59