mirror of
https://github.com/wiidev/usbloadergx.git
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315 lines
8.8 KiB
C
315 lines
8.8 KiB
C
/**
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* attrlist.c - Attribute list attribute handling code. Originated from the Linux-NTFS
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* project.
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*
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* Copyright (c) 2004-2005 Anton Altaparmakov
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* Copyright (c) 2004-2005 Yura Pakhuchiy
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* Copyright (c) 2006 Szabolcs Szakacsits
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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_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 "types.h"
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#include "layout.h"
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#include "attrib.h"
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#include "attrlist.h"
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#include "debug.h"
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#include "unistr.h"
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#include "logging.h"
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#include "misc.h"
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/**
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* ntfs_attrlist_need - check whether inode need attribute list
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* @ni: opened ntfs inode for which perform check
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*
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* Check whether all are attributes belong to one MFT record, in that case
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* attribute list is not needed.
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*
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* Return 1 if inode need attribute list, 0 if not, -1 on error with errno set
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* to the error code. If function succeed errno set to 0. The following error
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* codes are defined:
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* EINVAL - Invalid arguments passed to function or attribute haven't got
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* attribute list.
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*/
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int ntfs_attrlist_need(ntfs_inode *ni)
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{
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ATTR_LIST_ENTRY *ale;
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if (!ni) {
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ntfs_log_trace("Invalid arguments.\n");
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errno = EINVAL;
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return -1;
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}
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ntfs_log_trace("Entering for inode 0x%llx.\n", (long long) ni->mft_no);
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if (!NInoAttrList(ni)) {
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ntfs_log_trace("Inode haven't got attribute list.\n");
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errno = EINVAL;
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return -1;
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}
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if (!ni->attr_list) {
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ntfs_log_trace("Corrupt in-memory struct.\n");
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errno = EINVAL;
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return -1;
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}
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errno = 0;
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ale = (ATTR_LIST_ENTRY *)ni->attr_list;
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while ((u8*)ale < ni->attr_list + ni->attr_list_size) {
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if (MREF_LE(ale->mft_reference) != ni->mft_no)
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return 1;
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ale = (ATTR_LIST_ENTRY *)((u8*)ale + le16_to_cpu(ale->length));
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}
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return 0;
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}
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/**
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* ntfs_attrlist_entry_add - add an attribute list attribute entry
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* @ni: opened ntfs inode, which contains that attribute
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* @attr: attribute record to add to attribute list
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*
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* Return 0 on success and -1 on error with errno set to the error code. The
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* following error codes are defined:
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* EINVAL - Invalid arguments passed to function.
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* ENOMEM - Not enough memory to allocate necessary buffers.
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* EIO - I/O error occurred or damaged filesystem.
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* EEXIST - Such attribute already present in attribute list.
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*/
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int ntfs_attrlist_entry_add(ntfs_inode *ni, ATTR_RECORD *attr)
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{
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ATTR_LIST_ENTRY *ale;
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MFT_REF mref;
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ntfs_attr *na = NULL;
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ntfs_attr_search_ctx *ctx;
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u8 *new_al;
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int entry_len, entry_offset, err;
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ntfs_log_trace("Entering for inode 0x%llx, attr 0x%x.\n",
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(long long) ni->mft_no,
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(unsigned) le32_to_cpu(attr->type));
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if (!ni || !attr) {
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ntfs_log_trace("Invalid arguments.\n");
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errno = EINVAL;
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return -1;
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}
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mref = MK_LE_MREF(ni->mft_no, le16_to_cpu(ni->mrec->sequence_number));
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if (ni->nr_extents == -1)
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ni = ni->base_ni;
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if (!NInoAttrList(ni)) {
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ntfs_log_trace("Attribute list isn't present.\n");
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errno = ENOENT;
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return -1;
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}
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/* Determine size and allocate memory for new attribute list. */
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entry_len = (sizeof(ATTR_LIST_ENTRY) + sizeof(ntfschar) *
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attr->name_length + 7) & ~7;
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new_al = ntfs_calloc(ni->attr_list_size + entry_len);
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if (!new_al)
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return -1;
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/* Find place for the new entry. */
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ctx = ntfs_attr_get_search_ctx(ni, NULL);
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if (!ctx) {
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err = errno;
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goto err_out;
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}
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if (!ntfs_attr_lookup(attr->type, (attr->name_length) ? (ntfschar*)
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((u8*)attr + le16_to_cpu(attr->name_offset)) :
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AT_UNNAMED, attr->name_length, CASE_SENSITIVE,
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(attr->non_resident) ? le64_to_cpu(attr->lowest_vcn) :
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0, (attr->non_resident) ? NULL : ((u8*)attr +
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le16_to_cpu(attr->value_offset)), (attr->non_resident) ?
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0 : le32_to_cpu(attr->value_length), ctx)) {
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/* Found some extent, check it to be before new extent. */
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if (ctx->al_entry->lowest_vcn == attr->lowest_vcn) {
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err = EEXIST;
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ntfs_log_trace("Such attribute already present in the "
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"attribute list.\n");
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ntfs_attr_put_search_ctx(ctx);
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goto err_out;
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}
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/* Add new entry after this extent. */
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ale = (ATTR_LIST_ENTRY*)((u8*)ctx->al_entry +
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le16_to_cpu(ctx->al_entry->length));
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} else {
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/* Check for real errors. */
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if (errno != ENOENT) {
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err = errno;
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ntfs_log_trace("Attribute lookup failed.\n");
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ntfs_attr_put_search_ctx(ctx);
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goto err_out;
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}
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/* No previous extents found. */
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ale = ctx->al_entry;
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}
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/* Don't need it anymore, @ctx->al_entry points to @ni->attr_list. */
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ntfs_attr_put_search_ctx(ctx);
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/* Determine new entry offset. */
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entry_offset = ((u8 *)ale - ni->attr_list);
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/* Set pointer to new entry. */
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ale = (ATTR_LIST_ENTRY *)(new_al + entry_offset);
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/* Zero it to fix valgrind warning. */
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memset(ale, 0, entry_len);
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/* Form new entry. */
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ale->type = attr->type;
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ale->length = cpu_to_le16(entry_len);
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ale->name_length = attr->name_length;
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ale->name_offset = offsetof(ATTR_LIST_ENTRY, name);
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if (attr->non_resident)
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ale->lowest_vcn = attr->lowest_vcn;
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else
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ale->lowest_vcn = 0;
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ale->mft_reference = mref;
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ale->instance = attr->instance;
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memcpy(ale->name, (u8 *)attr + le16_to_cpu(attr->name_offset),
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attr->name_length * sizeof(ntfschar));
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/* Resize $ATTRIBUTE_LIST to new length. */
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na = ntfs_attr_open(ni, AT_ATTRIBUTE_LIST, AT_UNNAMED, 0);
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if (!na) {
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err = errno;
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ntfs_log_trace("Failed to open $ATTRIBUTE_LIST attribute.\n");
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goto err_out;
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}
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if (ntfs_attr_truncate(na, ni->attr_list_size + entry_len)) {
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err = errno;
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ntfs_log_trace("$ATTRIBUTE_LIST resize failed.\n");
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goto err_out;
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}
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/* Copy entries from old attribute list to new. */
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memcpy(new_al, ni->attr_list, entry_offset);
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memcpy(new_al + entry_offset + entry_len, ni->attr_list +
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entry_offset, ni->attr_list_size - entry_offset);
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/* Set new runlist. */
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free(ni->attr_list);
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ni->attr_list = new_al;
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ni->attr_list_size = ni->attr_list_size + entry_len;
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NInoAttrListSetDirty(ni);
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/* Done! */
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ntfs_attr_close(na);
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return 0;
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err_out:
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if (na)
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ntfs_attr_close(na);
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free(new_al);
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errno = err;
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return -1;
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}
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/**
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* ntfs_attrlist_entry_rm - remove an attribute list attribute entry
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* @ctx: attribute search context describing the attribute list entry
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*
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* Remove the attribute list entry @ctx->al_entry from the attribute list.
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*
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* Return 0 on success and -1 on error with errno set to the error code.
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*/
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int ntfs_attrlist_entry_rm(ntfs_attr_search_ctx *ctx)
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{
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u8 *new_al;
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int new_al_len;
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ntfs_inode *base_ni;
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ntfs_attr *na;
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ATTR_LIST_ENTRY *ale;
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int err;
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if (!ctx || !ctx->ntfs_ino || !ctx->al_entry) {
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ntfs_log_trace("Invalid arguments.\n");
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errno = EINVAL;
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return -1;
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}
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if (ctx->base_ntfs_ino)
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base_ni = ctx->base_ntfs_ino;
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else
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base_ni = ctx->ntfs_ino;
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ale = ctx->al_entry;
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ntfs_log_trace("Entering for inode 0x%llx, attr 0x%x, lowest_vcn %lld.\n",
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(long long) ctx->ntfs_ino->mft_no,
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(unsigned) le32_to_cpu(ctx->al_entry->type),
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(long long) le64_to_cpu(ctx->al_entry->lowest_vcn));
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if (!NInoAttrList(base_ni)) {
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ntfs_log_trace("Attribute list isn't present.\n");
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errno = ENOENT;
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return -1;
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}
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/* Allocate memory for new attribute list. */
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new_al_len = base_ni->attr_list_size - le16_to_cpu(ale->length);
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new_al = ntfs_calloc(new_al_len);
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if (!new_al)
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return -1;
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/* Reisze $ATTRIBUTE_LIST to new length. */
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na = ntfs_attr_open(base_ni, AT_ATTRIBUTE_LIST, AT_UNNAMED, 0);
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if (!na) {
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err = errno;
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ntfs_log_trace("Failed to open $ATTRIBUTE_LIST attribute.\n");
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goto err_out;
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}
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if (ntfs_attr_truncate(na, new_al_len)) {
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err = errno;
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ntfs_log_trace("$ATTRIBUTE_LIST resize failed.\n");
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goto err_out;
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}
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/* Copy entries from old attribute list to new. */
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memcpy(new_al, base_ni->attr_list, (u8*)ale - base_ni->attr_list);
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memcpy(new_al + ((u8*)ale - base_ni->attr_list), (u8*)ale + le16_to_cpu(
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ale->length), new_al_len - ((u8*)ale - base_ni->attr_list));
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/* Set new runlist. */
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free(base_ni->attr_list);
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base_ni->attr_list = new_al;
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base_ni->attr_list_size = new_al_len;
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NInoAttrListSetDirty(base_ni);
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/* Done! */
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ntfs_attr_close(na);
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return 0;
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err_out:
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if (na)
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ntfs_attr_close(na);
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free(new_al);
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errno = err;
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return -1;
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}
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