mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-12-03 00:24:19 +01:00
370 lines
9.8 KiB
C
370 lines
9.8 KiB
C
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/**
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* attrib.c - Attribute handling code. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2000-2005 Anton Altaparmakov
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* Copyright (c) 2002-2005 Richard Russon
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* Copyright (c) 2002-2008 Szabolcs Szakacsits
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* Copyright (c) 2004-2007 Yura Pakhuchiy
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* Copyright (c) 2007-2009 Jean-Pierre Andre
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.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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#ifdef HAVE_STDLIB_H
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#include <stdlib.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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#include "compat.h"
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#include "attrib.h"
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#include "attrlist.h"
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#include "device.h"
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#include "mft.h"
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#include "debug.h"
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#include "mst.h"
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#include "volume.h"
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#include "types.h"
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#include "layout.h"
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#include "inode.h"
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#include "runlist.h"
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#include "lcnalloc.h"
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#include "dir.h"
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#include "compress.h"
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#include "bitmap.h"
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#include "logging.h"
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#include "misc.h"
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#include "efs.h"
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#include "ntfs.h"
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#include "ntfsfile_frag.h"
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static inline u8 size_to_shift(u32 size)
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{
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u8 ret = 0;
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while (size)
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{
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ret++;
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size >>= 1;
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}
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return ret - 1;
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}
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/**
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* ntfs_attr_pread_i - see description at ntfs_attr_pread()
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*/
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static s64 ntfs_attr_getfragments_i(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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{
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u64 b = offset;
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s64 br, to_read, ofs, total, total2, max_read, max_init;
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ntfs_volume *vol;
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runlist_element *rl;
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//u16 efs_padding_length;
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/* Sanity checking arguments is done in ntfs_attr_pread(). */
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if ((na->data_flags & ATTR_COMPRESSION_MASK) && NAttrNonResident(na))
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{
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//return -1; // no compressed files
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return -31;
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/*
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if ((na->data_flags & ATTR_COMPRESSION_MASK)
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== ATTR_IS_COMPRESSED)
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return ntfs_compressed_attr_pread(na, pos, count, b);
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else {
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// compression mode not supported
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errno = EOPNOTSUPP;
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return -1;
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}
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*/
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}
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/*
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* Encrypted non-resident attributes are not supported. We return
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* access denied, which is what Windows NT4 does, too.
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* However, allow if mounted with efs_raw option
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*/
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vol = na->ni->vol;
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if (!vol->efs_raw && NAttrEncrypted(na) && NAttrNonResident(na)) {
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errno = EACCES;
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//return -1;
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return -32;
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}
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if (!count)
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return 0;
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/*
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* Truncate reads beyond end of attribute,
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* but round to next 512 byte boundary for encrypted
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* attributes with efs_raw mount option
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*/
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max_read = na->data_size;
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max_init = na->initialized_size;
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if (na->ni->vol->efs_raw
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&& (na->data_flags & ATTR_IS_ENCRYPTED)
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&& NAttrNonResident(na)) {
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if (na->data_size != na->initialized_size) {
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ntfs_log_error("uninitialized encrypted file not supported\n");
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errno = EINVAL;
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//return -1;
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return -33;
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}
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max_init = max_read = ((na->data_size + 511) & ~511) + 2;
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}
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if (pos + count > max_read) {
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if (pos >= max_read)
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return 0;
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count = max_read - pos;
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}
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/* If it is a resident attribute, get the value from the mft record. */
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if (!NAttrNonResident(na))
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{
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return -34; // No resident files
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/*
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ntfs_attr_search_ctx *ctx;
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char *val;
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ctx = ntfs_attr_get_search_ctx(na->ni, NULL);
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if (!ctx)
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return -1;
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if (ntfs_attr_lookup(na->type, na->name, na->name_len, 0,
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0, NULL, 0, ctx)) {
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res_err_out:
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ntfs_attr_put_search_ctx(ctx);
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return -1;
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}
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val = (char*)ctx->attr + le16_to_cpu(ctx->attr->value_offset);
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if (val < (char*)ctx->attr || val +
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le32_to_cpu(ctx->attr->value_length) >
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(char*)ctx->mrec + vol->mft_record_size) {
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errno = EIO;
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ntfs_log_perror("%s: Sanity check failed", __FUNCTION__);
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goto res_err_out;
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}
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memcpy(b, val + pos, count);
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ntfs_attr_put_search_ctx(ctx);
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return count;
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*/
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}
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total = total2 = 0;
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/* Zero out reads beyond initialized size. */
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if (pos + count > max_init) {
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if (pos >= max_init) {
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//memset(b, 0, count);
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return count;
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}
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total2 = pos + count - max_init;
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count -= total2;
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//memset((u8*)b + count, 0, total2);
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}
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/*
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* for encrypted non-resident attributes with efs_raw set
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* the last two bytes aren't read from disk but contain
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* the number of padding bytes so original size can be
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* restored
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*/
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if (na->ni->vol->efs_raw &&
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(na->data_flags & ATTR_IS_ENCRYPTED) &&
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((pos + count) > max_init-2))
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{
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return -35; //No encrypted files
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/*
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efs_padding_length = 511 - ((na->data_size - 1) & 511);
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if (pos+count == max_init) {
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if (count == 1) {
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*((u8*)b+count-1) = (u8)(efs_padding_length >> 8);
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count--;
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total2++;
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} else {
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*(u16*)((u8*)b+count-2) = cpu_to_le16(efs_padding_length);
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count -= 2;
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total2 +=2;
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}
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} else {
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*((u8*)b+count-1) = (u8)(efs_padding_length & 0xff);
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count--;
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total2++;
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}
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*/
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}
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/* Find the runlist element containing the vcn. */
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rl = ntfs_attr_find_vcn(na, pos >> vol->cluster_size_bits);
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if (!rl) {
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/*
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* If the vcn is not present it is an out of bounds read.
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* However, we already truncated the read to the data_size,
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* so getting this here is an error.
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*/
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if (errno == ENOENT) {
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errno = EIO;
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ntfs_log_perror("%s: Failed to find VCN #1", __FUNCTION__);
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}
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//return -1;
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return -36;
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}
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/*
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* Gather the requested data into the linear destination buffer. Note,
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* a partial final vcn is taken care of by the @count capping of read
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* length.
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*/
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ofs = pos - (rl->vcn << vol->cluster_size_bits);
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for (; count; rl++, ofs = 0) {
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if (rl->lcn == LCN_RL_NOT_MAPPED) {
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rl = ntfs_attr_find_vcn(na, rl->vcn);
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if (!rl) {
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if (errno == ENOENT) {
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errno = EIO;
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ntfs_log_perror("%s: Failed to find VCN #2",
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__FUNCTION__);
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}
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goto rl_err_out;
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}
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/* Needed for case when runs merged. */
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ofs = pos + total - (rl->vcn << vol->cluster_size_bits);
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}
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if (!rl->length) {
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errno = EIO;
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ntfs_log_perror("%s: Zero run length", __FUNCTION__);
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goto rl_err_out;
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}
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if (rl->lcn < (LCN)0) {
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if (rl->lcn != (LCN)LCN_HOLE) {
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ntfs_log_perror("%s: Bad run (%lld)",
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__FUNCTION__,
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(long long)rl->lcn);
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goto rl_err_out;
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}
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/* It is a hole, just zero the matching @b range. */
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to_read = min(count, (rl->length <<
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vol->cluster_size_bits) - ofs);
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//memset(b, 0, to_read);
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/* Update progress counters. */
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total += to_read;
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count -= to_read;
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b = b + to_read;
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continue;
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}
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/* It is a real lcn, read it into @dst. */
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to_read = min(count, (rl->length << vol->cluster_size_bits) -
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ofs);
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retry:
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ntfs_log_trace("Reading %lld bytes from vcn %lld, lcn %lld, ofs"
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" %lld.\n", (long long)to_read, (long long)rl->vcn,
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(long long )rl->lcn, (long long)ofs);
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/*
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br = ntfs_pread(vol->dev, (rl->lcn << vol->cluster_size_bits) +
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ofs, to_read, b);
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*/
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br = to_read;
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// convert to sectors unit
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u32 shift = size_to_shift(na->ni->vol->sector_size);
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u32 off_sec = b >> shift;
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u32 sector = ((rl->lcn << vol->cluster_size_bits) + ofs) >> shift;
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u32 count_sec = to_read >> shift;
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int ret;
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ret = append_fragment(callback_data, off_sec, sector, count_sec);
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if (ret) {
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if (ret < 0) return ret;
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return -50;
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}
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/* If everything ok, update progress counters and continue. */
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if (br > 0) {
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total += br;
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count -= br;
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b = b + br;
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}
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if (br == to_read)
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continue;
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/* If the syscall was interrupted, try again. */
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if (br == (s64)-1 && errno == EINTR)
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goto retry;
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if (total)
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return total;
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if (!br)
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errno = EIO;
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ntfs_log_perror("%s: ntfs_pread failed", __FUNCTION__);
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//return -1;
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return -38;
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}
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/* Finally, return the number of bytes read. */
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return total + total2;
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rl_err_out:
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if (total)
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return total;
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errno = EIO;
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//return -1;
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return -39;
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}
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/**
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* ntfs_attr_pread - read from an attribute specified by an ntfs_attr structure
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* @na: ntfs attribute to read from
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* @pos: byte position in the attribute to begin reading from
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* @count: number of bytes to read
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* @b: output data buffer
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*
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* This function will read @count bytes starting at offset @pos from the ntfs
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* attribute @na into the data buffer @b.
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*
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* On success, return the number of successfully read bytes. If this number is
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* lower than @count this means that the read reached end of file or that an
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* error was encountered during the read so that the read is partial. 0 means
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* end of file or nothing was read (also return 0 when @count is 0).
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*
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* On error and nothing has been read, return -1 with errno set appropriately
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* to the return code of ntfs_pread(), or to EINVAL in case of invalid
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* arguments.
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*/
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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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{
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s64 ret;
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if (!na || !na->ni || !na->ni->vol || !callback_data || pos < 0 || count < 0) {
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errno = EINVAL;
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ntfs_log_perror("%s: na=%p b=%p pos=%lld count=%lld",
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__FUNCTION__, na, callback_data, (long long)pos,
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(long long)count);
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//return -1;
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return -21;
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}
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/*
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ntfs_log_enter("Entering for inode %lld attr 0x%x pos %lld count "
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"%lld\n", (unsigned long long)na->ni->mft_no,
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na->type, (long long)pos, (long long)count);
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*/
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ret = ntfs_attr_getfragments_i(na, pos, count, offset,
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append_fragment, callback_data);
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//ntfs_log_leave("\n");
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return ret;
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}
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