2010-12-26 18:02:14 +01:00
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/**
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* ntfsfile.c - devoptab file routines for NTFS-based devices.
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* Copyright (c) 2010 Miigotu
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* Copyright (c) 2009 Rhys "Shareese" Koedijk
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* Copyright (c) 2006 Michael "Chishm" Chisholm
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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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2011-06-24 21:37:01 +02:00
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* by the Free Software Foundation; either version 2 of the License, or
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2010-12-26 18:02:14 +01:00
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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; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "ntfsinternal.h"
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#include "ntfsfile.h"
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#include "ntfs.h"
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#include "ntfsfile_frag.h"
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2011-06-24 21:37:01 +02:00
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s64 ntfs_attr_getfragments(ntfs_attr *na, const s64 pos, s64 count, u64 offset,
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_ntfs_frag_append_t append_fragment, void *callback_data);
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2010-12-26 18:02:14 +01:00
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2011-06-24 21:37:01 +02:00
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static inline u8 size_to_shift(u32 size)
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2010-12-26 18:02:14 +01:00
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{
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2011-06-24 21:37:01 +02:00
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u8 ret = 0;
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while (size)
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2010-12-26 18:02:14 +01:00
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{
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2011-06-24 21:37:01 +02:00
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ret++;
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size >>= 1;
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2010-12-26 18:02:14 +01:00
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}
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2011-06-24 21:37:01 +02:00
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return ret - 1;
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2010-12-26 18:02:14 +01:00
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}
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int _NTFS_get_fragments (const char *path,
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_ntfs_frag_append_t append_fragment, void *callback_data)
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{
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struct _reent r;
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ntfs_file_state file_st, *file = &file_st;
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ssize_t read = 0;
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int ret_val = -11;
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// Open File
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r._errno = 0;
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int fd = ntfs_open_r(&r, file, path, O_RDONLY, 0);
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if (fd != (int)file) return -12;
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// Sanity check
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if (!file || !file->vd || !file->ni || !file->data_na) {
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//r->_errno = EINVAL;
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return -13;
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}
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2011-06-24 21:37:01 +02:00
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2010-12-26 18:02:14 +01:00
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// Lock
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ntfsLock(file->vd);
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u64 offset = 0;
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u64 len = file->len;
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// Read from the files data attribute
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while (len) {
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s64 ret = ntfs_attr_getfragments(file->data_na, file->pos,
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len, offset, append_fragment, callback_data);
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if (ret <= 0 || ret > len) {
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ntfsUnlock(file->vd);
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//r->_errno = errno;
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ret_val = -14;
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if (ret < 0) ret_val = ret;
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goto out;
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}
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offset += ret;
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len -= ret;
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file->pos += ret;
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read += ret;
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}
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2011-06-24 21:37:01 +02:00
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u32 shift = size_to_shift(file->ni->vol->sector_size);
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2010-12-26 18:02:14 +01:00
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// set file size
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2011-06-24 21:37:01 +02:00
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append_fragment(callback_data, file->len >> shift, 0, 0);
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2010-12-26 18:02:14 +01:00
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// success
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ret_val = 0;
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out:
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// Unlock
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ntfsUnlock(file->vd);
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// Close the file
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ntfs_close_r (&r, fd);
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return ret_val;
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}
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