mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-28 06:04:16 +01:00
30bc03c9fa
-updated libext2fs to e2fsprogs 1.42 -updated libfat to R4883 Thanks to USB Loader GX for the new libs
158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
/*
|
|
* ext_attr.c --- extended attribute blocks
|
|
*
|
|
* Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
|
|
*
|
|
* Copyright (C) 2002 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Library
|
|
* General Public License, version 2.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <stdio.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2_ext_attr.h"
|
|
|
|
#include "ext2fs.h"
|
|
|
|
#define NAME_HASH_SHIFT 5
|
|
#define VALUE_HASH_SHIFT 16
|
|
|
|
/*
|
|
* ext2_xattr_hash_entry()
|
|
*
|
|
* Compute the hash of an extended attribute.
|
|
*/
|
|
__u32 ext2fs_ext_attr_hash_entry(struct ext2_ext_attr_entry *entry, void *data)
|
|
{
|
|
__u32 hash = 0;
|
|
char *name = ((char *) entry) + sizeof(struct ext2_ext_attr_entry);
|
|
int n;
|
|
|
|
for (n = 0; n < entry->e_name_len; n++) {
|
|
hash = (hash << NAME_HASH_SHIFT) ^
|
|
(hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^
|
|
*name++;
|
|
}
|
|
|
|
/* The hash needs to be calculated on the data in little-endian. */
|
|
if (entry->e_value_block == 0 && entry->e_value_size != 0) {
|
|
__u32 *value = (__u32 *)data;
|
|
for (n = (entry->e_value_size + EXT2_EXT_ATTR_ROUND) >>
|
|
EXT2_EXT_ATTR_PAD_BITS; n; n--) {
|
|
hash = (hash << VALUE_HASH_SHIFT) ^
|
|
(hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^
|
|
ext2fs_le32_to_cpu(*value++);
|
|
}
|
|
}
|
|
|
|
return hash;
|
|
}
|
|
|
|
#undef NAME_HASH_SHIFT
|
|
#undef VALUE_HASH_SHIFT
|
|
|
|
errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
|
|
{
|
|
errcode_t retval;
|
|
|
|
retval = io_channel_read_blk64(fs->io, block, 1, buf);
|
|
if (retval)
|
|
return retval;
|
|
#ifdef WORDS_BIGENDIAN
|
|
ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
|
|
{
|
|
return ext2fs_read_ext_attr2(fs, block, buf);
|
|
}
|
|
|
|
errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block, void *inbuf)
|
|
{
|
|
errcode_t retval;
|
|
char *write_buf;
|
|
#ifdef WORDS_BIGENDIAN
|
|
char *buf = NULL;
|
|
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
|
if (retval)
|
|
return retval;
|
|
write_buf = buf;
|
|
ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1);
|
|
#else
|
|
write_buf = (char *) inbuf;
|
|
#endif
|
|
retval = io_channel_write_blk64(fs->io, block, 1, write_buf);
|
|
#ifdef WORDS_BIGENDIAN
|
|
ext2fs_free_mem(&buf);
|
|
#endif
|
|
if (!retval)
|
|
ext2fs_mark_changed(fs);
|
|
return retval;
|
|
}
|
|
|
|
errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
|
|
{
|
|
return ext2fs_write_ext_attr2(fs, block, inbuf);
|
|
}
|
|
|
|
/*
|
|
* This function adjusts the reference count of the EA block.
|
|
*/
|
|
errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
|
|
char *block_buf, int adjust,
|
|
__u32 *newcount)
|
|
{
|
|
errcode_t retval;
|
|
struct ext2_ext_attr_header *header;
|
|
char *buf = 0;
|
|
|
|
if ((blk >= ext2fs_blocks_count(fs->super)) ||
|
|
(blk < fs->super->s_first_data_block))
|
|
return EXT2_ET_BAD_EA_BLOCK_NUM;
|
|
|
|
if (!block_buf) {
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
|
if (retval)
|
|
return retval;
|
|
block_buf = buf;
|
|
}
|
|
|
|
retval = ext2fs_read_ext_attr2(fs, blk, block_buf);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
header = (struct ext2_ext_attr_header *) block_buf;
|
|
header->h_refcount += adjust;
|
|
if (newcount)
|
|
*newcount = header->h_refcount;
|
|
|
|
retval = ext2fs_write_ext_attr2(fs, blk, block_buf);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
errout:
|
|
if (buf)
|
|
ext2fs_free_mem(&buf);
|
|
return retval;
|
|
}
|
|
|
|
errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
|
|
char *block_buf, int adjust,
|
|
__u32 *newcount)
|
|
{
|
|
return ext2fs_adjust_ea_refcount(fs, blk, block_buf, adjust, newcount);
|
|
}
|