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89fc757642
*Fixed Font loading. The font.ttf is loaded from the path with .thems if it exists there. When a Theme is loaded and a font.ttf file exists in the defined "Image-Folder:" than this font.ttf will override all others. This ensures support for themes with special fonts. *Fixed double count on playcount bug *Updated libext2fs to git snapshot 2010-12-24 *Added proper close of all file systems where the games are loaded from (FAT32/NTFS/EXT) *Fixed hang bug when reloading into the IOS set in the individual game settings with that (reload to 223, 224, 245, ...)
289 lines
7.9 KiB
C
289 lines
7.9 KiB
C
/*
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* csum.c --- checksumming of ext3 structures
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*
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* Copyright (C) 2006 Cluster File Systems, Inc.
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* Copyright (C) 2006, 2007 by Andreas Dilger <adilger@clusterfs.com>
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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#include "crc16.h"
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#include <assert.h>
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#ifndef offsetof
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif
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#ifdef DEBUG
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#define STATIC
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#else
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#define STATIC static
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#endif
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STATIC __u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group)
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{
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__u16 crc = 0;
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struct ext2_group_desc *desc;
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size_t size;
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size = fs->super->s_desc_size;
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if (size < EXT2_MIN_DESC_SIZE)
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size = EXT2_MIN_DESC_SIZE;
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if (size > sizeof(struct ext4_group_desc)) {
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printf("%s: illegal s_desc_size(%zd)\n", __func__, size);
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size = sizeof(struct ext4_group_desc);
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}
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desc = ext2fs_group_desc(fs, fs->group_desc, group);
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if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
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int offset = offsetof(struct ext2_group_desc, bg_checksum);
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#ifdef WORDS_BIGENDIAN
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struct ext4_group_desc swabdesc;
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/* Have to swab back to little-endian to do the checksum */
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memcpy(&swabdesc, desc, size);
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ext2fs_swap_group_desc2(fs,
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(struct ext2_group_desc *) &swabdesc);
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desc = (struct ext2_group_desc *) &swabdesc;
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group = ext2fs_swab32(group);
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#endif
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crc = ext2fs_crc16(~0, fs->super->s_uuid,
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sizeof(fs->super->s_uuid));
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crc = ext2fs_crc16(crc, &group, sizeof(group));
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crc = ext2fs_crc16(crc, desc, offset);
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offset += sizeof(desc->bg_checksum); /* skip checksum */
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/* for checksum of struct ext4_group_desc do the rest...*/
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if (offset < size) {
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crc = ext2fs_crc16(crc, (char *)desc + offset,
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size - offset);
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}
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}
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return crc;
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}
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int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group)
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{
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if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
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EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
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(ext2fs_bg_checksum(fs, group) !=
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ext2fs_group_desc_csum(fs, group)))
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return 0;
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return 1;
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}
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void ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group)
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{
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if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
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EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
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return;
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/* ext2fs_bg_checksum_set() sets the actual checksum field but
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* does not calculate the checksum itself. */
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ext2fs_bg_checksum_set(fs, group, ext2fs_group_desc_csum(fs, group));
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}
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static __u32 find_last_inode_ingrp(ext2fs_inode_bitmap bitmap,
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__u32 inodes_per_grp, dgrp_t grp_no)
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{
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ext2_ino_t i, start_ino, end_ino;
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start_ino = grp_no * inodes_per_grp + 1;
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end_ino = start_ino + inodes_per_grp - 1;
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for (i = end_ino; i >= start_ino; i--) {
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if (ext2fs_fast_test_inode_bitmap2(bitmap, i))
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return i - start_ino + 1;
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}
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return inodes_per_grp;
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}
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/* update the bitmap flags, set the itable high watermark, and calculate
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* checksums for the group descriptors */
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errcode_t ext2fs_set_gdt_csum(ext2_filsys fs)
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{
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struct ext2_super_block *sb = fs->super;
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int dirty = 0;
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dgrp_t i;
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if (!fs->inode_map)
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return EXT2_ET_NO_INODE_BITMAP;
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if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
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EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
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return 0;
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for (i = 0; i < fs->group_desc_count; i++) {
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unsigned int old_csum = ext2fs_bg_checksum(fs, i);
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int old_unused = ext2fs_bg_itable_unused(fs, i);
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unsigned int old_flags = ext2fs_bg_flags(fs, i);
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int old_free_inodes_count = ext2fs_bg_free_inodes_count(fs, i);
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if (old_free_inodes_count == sb->s_inodes_per_group) {
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ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
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ext2fs_bg_itable_unused_set(fs, i, sb->s_inodes_per_group);
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} else {
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int unused =
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sb->s_inodes_per_group -
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find_last_inode_ingrp(fs->inode_map,
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sb->s_inodes_per_group, i);
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ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
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ext2fs_bg_itable_unused_set(fs, i, unused);
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}
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ext2fs_group_desc_csum_set(fs, i);
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if (old_flags != ext2fs_bg_flags(fs, i))
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dirty = 1;
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if (old_unused != ext2fs_bg_itable_unused(fs, i))
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dirty = 1;
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if (old_csum != ext2fs_bg_checksum(fs, i))
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dirty = 1;
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}
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if (dirty)
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ext2fs_mark_super_dirty(fs);
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return 0;
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}
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#ifdef DEBUG
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#include "e2p/e2p.h"
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void print_csum(const char *msg, ext2_filsys fs, dgrp_t group)
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{
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__u16 crc1, crc2, crc3;
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dgrp_t swabgroup;
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struct ext2_group_desc *desc = ext2fs_group_desc(fs, fs->group_desc, group);
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size_t size;
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struct ext2_super_block *sb = fs->super;
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int offset = offsetof(struct ext2_group_desc, bg_checksum);
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#ifdef WORDS_BIGENDIAN
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struct ext4_group_desc swabdesc;
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#endif
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size = fs->super->s_desc_size;
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if (size < EXT2_MIN_DESC_SIZE)
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size = EXT2_MIN_DESC_SIZE;
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if (size > sizeof(struct ext4_group_desc))
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size = sizeof(struct ext4_group_desc);
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#ifdef WORDS_BIGENDIAN
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/* Have to swab back to little-endian to do the checksum */
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memcpy(&swabdesc, desc, size);
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ext2fs_swap_group_desc2(fs, (struct ext2_group_desc *) &swabdesc);
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desc = (struct ext2_group_desc *) &swabdesc;
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swabgroup = ext2fs_swab32(group);
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#else
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swabgroup = group;
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#endif
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crc1 = ext2fs_crc16(~0, sb->s_uuid, sizeof(fs->super->s_uuid));
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crc2 = ext2fs_crc16(crc1, &swabgroup, sizeof(swabgroup));
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crc3 = ext2fs_crc16(crc2, desc, offset);
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offset += sizeof(desc->bg_checksum); /* skip checksum */
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/* for checksum of struct ext4_group_desc do the rest...*/
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if (offset < size)
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crc3 = ext2fs_crc16(crc3, (char *)desc + offset, size - offset);
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printf("%s: UUID %s(%04x), grp %u(%04x): %04x=%04x\n",
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msg, e2p_uuid2str(sb->s_uuid), crc1, group, crc2, crc3,
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ext2fs_group_desc_csum(fs, group));
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}
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unsigned char sb_uuid[16] = { 0x4f, 0x25, 0xe8, 0xcf, 0xe7, 0x97, 0x48, 0x23,
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0xbe, 0xfa, 0xa7, 0x88, 0x4b, 0xae, 0xec, 0xdb };
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int main(int argc, char **argv)
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{
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struct ext2_super_block param;
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errcode_t retval;
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ext2_filsys fs;
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int i;
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__u16 csum1, csum2, csum_known = 0xd3a4;
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memset(¶m, 0, sizeof(param));
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ext2fs_blocks_count_set(¶m, 32768);
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retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, ¶m,
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test_io_manager, &fs);
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if (retval) {
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com_err("setup", retval,
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"While initializing filesystem");
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exit(1);
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}
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memcpy(fs->super->s_uuid, sb_uuid, 16);
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fs->super->s_feature_ro_compat = EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
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for (i=0; i < fs->group_desc_count; i++) {
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ext2fs_block_bitmap_loc_set(fs, i, 124);
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ext2fs_inode_bitmap_loc_set(fs, i, 125);
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ext2fs_inode_table_loc_set(fs, i, 126);
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ext2fs_bg_free_blocks_count_set(fs, i, 31119);
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ext2fs_bg_free_inodes_count_set(fs, i, 15701);
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ext2fs_bg_used_dirs_count_set(fs, i, 2);
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ext2fs_bg_flags_zap(fs, i);
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};
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csum1 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum0000", fs, 0);
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if (csum1 != csum_known) {
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printf("checksum for group 0 should be %04x\n", csum_known);
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exit(1);
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}
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csum2 = ext2fs_group_desc_csum(fs, 1);
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print_csum("csum0001", fs, 1);
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if (csum1 == csum2) {
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printf("checksums for different groups shouldn't match\n");
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exit(1);
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}
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csum2 = ext2fs_group_desc_csum(fs, 2);
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print_csum("csumffff", fs, 2);
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if (csum1 == csum2) {
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printf("checksums for different groups shouldn't match\n");
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exit(1);
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}
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ext2fs_bg_checksum_set(fs, 0, csum1);
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csum2 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum_set", fs, 0);
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if (csum1 != csum2) {
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printf("checksums should not depend on checksum field\n");
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exit(1);
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}
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if (!ext2fs_group_desc_csum_verify(fs, 0)) {
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printf("checksums should verify against gd_checksum\n");
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exit(1);
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}
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memset(fs->super->s_uuid, 0x30, sizeof(fs->super->s_uuid));
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print_csum("new_uuid", fs, 0);
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if (ext2fs_group_desc_csum_verify(fs, 0) != 0) {
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printf("checksums for different filesystems shouldn't match\n");
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exit(1);
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}
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csum1 = ext2fs_group_desc_csum(fs, 0);
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ext2fs_bg_checksum_set(fs, 0, csum1);
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print_csum("csum_new", fs, 0);
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ext2fs_bg_free_blocks_count_set(fs, 0, 1);
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csum2 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum_blk", fs, 0);
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if (csum1 == csum2) {
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printf("checksums for different data shouldn't match\n");
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exit(1);
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}
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return 0;
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}
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#endif
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