mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-27 21:54:15 +01:00
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
|
|
* dirblock.c --- directory block routines.
|
|
*
|
|
* Copyright (C) 1995, 1996 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 <stdio.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2fs.h"
|
|
|
|
errcode_t ext2fs_read_dir_block3(ext2_filsys fs, blk64_t block,
|
|
void *buf, int flags EXT2FS_ATTR((unused)))
|
|
{
|
|
errcode_t retval;
|
|
char *p, *end;
|
|
struct ext2_dir_entry *dirent;
|
|
unsigned int name_len, rec_len;
|
|
|
|
|
|
retval = io_channel_read_blk64(fs->io, block, 1, buf);
|
|
if (retval)
|
|
return retval;
|
|
|
|
p = (char *) buf;
|
|
end = (char *) buf + fs->blocksize;
|
|
while (p < end-8) {
|
|
dirent = (struct ext2_dir_entry *) p;
|
|
#ifdef WORDS_BIGENDIAN
|
|
dirent->inode = ext2fs_swab32(dirent->inode);
|
|
dirent->rec_len = ext2fs_swab16(dirent->rec_len);
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
#endif
|
|
name_len = dirent->name_len;
|
|
#ifdef WORDS_BIGENDIAN
|
|
if (flags & EXT2_DIRBLOCK_V2_STRUCT)
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
#endif
|
|
if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
|
|
return retval;
|
|
if ((rec_len < 8) || (rec_len % 4)) {
|
|
rec_len = 8;
|
|
retval = EXT2_ET_DIR_CORRUPTED;
|
|
} else if (((name_len & 0xFF) + 8) > rec_len)
|
|
retval = EXT2_ET_DIR_CORRUPTED;
|
|
p += rec_len;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
|
|
void *buf, int flags EXT2FS_ATTR((unused)))
|
|
{
|
|
return ext2fs_read_dir_block3(fs, block, buf, flags);
|
|
}
|
|
|
|
errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
|
|
void *buf)
|
|
{
|
|
return ext2fs_read_dir_block3(fs, block, buf, 0);
|
|
}
|
|
|
|
|
|
errcode_t ext2fs_write_dir_block3(ext2_filsys fs, blk64_t block,
|
|
void *inbuf, int flags EXT2FS_ATTR((unused)))
|
|
{
|
|
#ifdef WORDS_BIGENDIAN
|
|
errcode_t retval;
|
|
char *p, *end;
|
|
char *buf = 0;
|
|
unsigned int rec_len;
|
|
struct ext2_dir_entry *dirent;
|
|
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
|
if (retval)
|
|
return retval;
|
|
memcpy(buf, inbuf, fs->blocksize);
|
|
p = buf;
|
|
end = buf + fs->blocksize;
|
|
while (p < end) {
|
|
dirent = (struct ext2_dir_entry *) p;
|
|
if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
|
|
return retval;
|
|
if ((rec_len < 8) ||
|
|
(rec_len % 4)) {
|
|
ext2fs_free_mem(&buf);
|
|
return (EXT2_ET_DIR_CORRUPTED);
|
|
}
|
|
p += rec_len;
|
|
dirent->inode = ext2fs_swab32(dirent->inode);
|
|
dirent->rec_len = ext2fs_swab16(dirent->rec_len);
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
|
|
if (flags & EXT2_DIRBLOCK_V2_STRUCT)
|
|
dirent->name_len = ext2fs_swab16(dirent->name_len);
|
|
}
|
|
retval = io_channel_write_blk64(fs->io, block, 1, buf);
|
|
ext2fs_free_mem(&buf);
|
|
return retval;
|
|
#else
|
|
return io_channel_write_blk64(fs->io, block, 1, (char *) inbuf);
|
|
#endif
|
|
}
|
|
|
|
errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
|
|
void *inbuf, int flags EXT2FS_ATTR((unused)))
|
|
{
|
|
return ext2fs_write_dir_block3(fs, block, inbuf, flags);
|
|
}
|
|
|
|
errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
|
|
void *inbuf)
|
|
{
|
|
return ext2fs_write_dir_block3(fs, block, inbuf, 0);
|
|
}
|
|
|