Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * dirblock.c --- directory block routines. |
| 3 | * |
Theodore Ts'o | 21c84b7 | 1997-04-29 16:15:03 +0000 | [diff] [blame] | 4 | * Copyright (C) 1995, 1996 Theodore Ts'o. |
| 5 | * |
| 6 | * %Begin-Header% |
| 7 | * This file may be redistributed under the terms of the GNU Public |
| 8 | * License. |
| 9 | * %End-Header% |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
Theodore Ts'o | 4cbe8af | 1997-08-10 23:07:40 +0000 | [diff] [blame] | 13 | #if HAVE_UNISTD_H |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 14 | #include <unistd.h> |
Theodore Ts'o | 4cbe8af | 1997-08-10 23:07:40 +0000 | [diff] [blame] | 15 | #endif |
Theodore Ts'o | 21c84b7 | 1997-04-29 16:15:03 +0000 | [diff] [blame] | 16 | #include <string.h> |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 17 | #include <time.h> |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 18 | |
Theodore Ts'o | b5abe6f | 1998-01-19 14:47:53 +0000 | [diff] [blame] | 19 | #if EXT2_FLAT_INCLUDES |
| 20 | #include "ext2_fs.h" |
| 21 | #else |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 22 | #include <linux/ext2_fs.h> |
Theodore Ts'o | b5abe6f | 1998-01-19 14:47:53 +0000 | [diff] [blame] | 23 | #endif |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 24 | |
| 25 | #include "ext2fs.h" |
| 26 | |
| 27 | errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block, |
| 28 | void *buf) |
| 29 | { |
| 30 | errcode_t retval; |
| 31 | char *p, *end; |
| 32 | struct ext2_dir_entry *dirent; |
| 33 | |
| 34 | retval = io_channel_read_blk(fs->io, block, 1, buf); |
| 35 | if (retval) |
| 36 | return retval; |
Theodore Ts'o | 5c57647 | 1997-04-29 15:29:49 +0000 | [diff] [blame] | 37 | if ((fs->flags & (EXT2_FLAG_SWAP_BYTES| |
| 38 | EXT2_FLAG_SWAP_BYTES_READ)) == 0) |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 39 | return 0; |
Theodore Ts'o | b5abe6f | 1998-01-19 14:47:53 +0000 | [diff] [blame] | 40 | p = (char *) buf; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 41 | end = (char *) buf + fs->blocksize; |
Theodore Ts'o | e446d71 | 2001-01-05 22:27:06 +0000 | [diff] [blame^] | 42 | while (p < end-8) { |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 43 | dirent = (struct ext2_dir_entry *) p; |
| 44 | dirent->inode = ext2fs_swab32(dirent->inode); |
| 45 | dirent->rec_len = ext2fs_swab16(dirent->rec_len); |
| 46 | dirent->name_len = ext2fs_swab16(dirent->name_len); |
| 47 | p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; |
| 48 | } |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block, |
| 53 | void *inbuf) |
| 54 | { |
| 55 | errcode_t retval; |
| 56 | char *p, *end, *write_buf; |
| 57 | char *buf = 0; |
| 58 | struct ext2_dir_entry *dirent; |
| 59 | |
Theodore Ts'o | 5c57647 | 1997-04-29 15:29:49 +0000 | [diff] [blame] | 60 | if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || |
| 61 | (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) { |
Theodore Ts'o | 7b4e453 | 1997-10-26 03:41:24 +0000 | [diff] [blame] | 62 | retval = ext2fs_get_mem(fs->blocksize, (void **) &buf); |
| 63 | if (retval) |
| 64 | return retval; |
| 65 | write_buf = buf; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 66 | memcpy(buf, inbuf, fs->blocksize); |
| 67 | p = buf; |
| 68 | end = buf + fs->blocksize; |
| 69 | while (p < end) { |
| 70 | dirent = (struct ext2_dir_entry *) p; |
| 71 | p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; |
| 72 | dirent->inode = ext2fs_swab32(dirent->inode); |
| 73 | dirent->rec_len = ext2fs_swab16(dirent->rec_len); |
| 74 | dirent->name_len = ext2fs_swab16(dirent->name_len); |
| 75 | } |
| 76 | } else |
Theodore Ts'o | b5abe6f | 1998-01-19 14:47:53 +0000 | [diff] [blame] | 77 | write_buf = (char *) inbuf; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 78 | retval = io_channel_write_blk(fs->io, block, 1, write_buf); |
| 79 | if (buf) |
Theodore Ts'o | 7b4e453 | 1997-10-26 03:41:24 +0000 | [diff] [blame] | 80 | ext2fs_free_mem((void **) &buf); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 81 | return retval; |
| 82 | } |
| 83 | |
| 84 | |