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92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
/*
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* runlist.h - Exports for runlist handling. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2002 Anton Altaparmakov
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* Copyright (c) 2002 Richard Russon
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_RUNLIST_H
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#define _NTFS_RUNLIST_H
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#include "types.h"
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/* Forward declarations */
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typedef struct _runlist_element runlist_element;
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typedef runlist_element runlist;
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#include "attrib.h"
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#include "volume.h"
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/**
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* struct _runlist_element - in memory vcn to lcn mapping array element.
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* @vcn: starting vcn of the current array element
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* @lcn: starting lcn of the current array element
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* @length: length in clusters of the current array element
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*
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* The last vcn (in fact the last vcn + 1) is reached when length == 0.
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*
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* When lcn == -1 this means that the count vcns starting at vcn are not
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* physically allocated (i.e. this is a hole / data is sparse).
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*/
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struct _runlist_element /* In memory vcn to lcn mapping structure element. */
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{
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VCN vcn; /* vcn = Starting virtual cluster number. */
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LCN lcn; /* lcn = Starting logical cluster number. */
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s64 length; /* Run length in clusters. */
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};
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extern runlist_element *ntfs_rl_extend( ntfs_attr *na, runlist_element *rl,
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int more_entries );
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extern LCN ntfs_rl_vcn_to_lcn( const runlist_element *rl, const VCN vcn );
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extern s64 ntfs_rl_pread( const ntfs_volume *vol, const runlist_element *rl,
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const s64 pos, s64 count, void *b );
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extern s64 ntfs_rl_pwrite( const ntfs_volume *vol, const runlist_element *rl,
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s64 ofs, const s64 pos, s64 count, void *b );
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extern runlist_element *ntfs_runlists_merge( runlist_element *drl,
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runlist_element *srl );
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extern runlist_element *ntfs_mapping_pairs_decompress( const ntfs_volume *vol,
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const ATTR_RECORD *attr, runlist_element *old_rl );
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extern int ntfs_get_nr_significant_bytes( const s64 n );
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extern int ntfs_get_size_for_mapping_pairs( const ntfs_volume *vol,
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const runlist_element *rl, const VCN start_vcn, int max_size );
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extern int ntfs_write_significant_bytes( u8 *dst, const u8 *dst_max,
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const s64 n );
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extern int ntfs_mapping_pairs_build( const ntfs_volume *vol, u8 *dst,
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const int dst_len, const runlist_element *rl,
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const VCN start_vcn, runlist_element const **stop_rl );
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extern int ntfs_rl_truncate( runlist **arl, const VCN start_vcn );
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extern int ntfs_rl_sparse( runlist *rl );
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extern s64 ntfs_rl_get_compressed_size( ntfs_volume *vol, runlist *rl );
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#ifdef NTFS_TEST
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int test_rl_main( int argc, char *argv[] );
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#endif
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#endif /* defined _NTFS_RUNLIST_H */
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