summaryrefslogtreecommitdiff
path: root/lib/sqfs/deserialize_fstree.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/sqfs/deserialize_fstree.c')
-rw-r--r--lib/sqfs/deserialize_fstree.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/lib/sqfs/deserialize_fstree.c b/lib/sqfs/deserialize_fstree.c
deleted file mode 100644
index 11670e1..0000000
--- a/lib/sqfs/deserialize_fstree.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * deserialize_fstree.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "xattr_reader.h"
-#include "meta_reader.h"
-#include "highlevel.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-static int should_skip(int type, int flags)
-{
- switch (type) {
- case SQFS_INODE_BDEV:
- case SQFS_INODE_CDEV:
- case SQFS_INODE_EXT_CDEV:
- case SQFS_INODE_EXT_BDEV:
- return (flags & RDTREE_NO_DEVICES);
- case SQFS_INODE_SLINK:
- case SQFS_INODE_EXT_SLINK:
- return (flags & RDTREE_NO_SLINKS);
- case SQFS_INODE_SOCKET:
- case SQFS_INODE_EXT_SOCKET:
- return(flags & RDTREE_NO_SOCKETS);
- case SQFS_INODE_FIFO:
- case SQFS_INODE_EXT_FIFO:
- return (flags & RDTREE_NO_FIFO);
- }
- return 0;
-}
-
-static int restore_xattr(xattr_reader_t *xr, fstree_t *fs, tree_node_t *node,
- sqfs_inode_generic_t *inode)
-{
- uint32_t idx;
-
- switch (inode->base.type) {
- case SQFS_INODE_EXT_DIR:
- idx = inode->data.dir_ext.xattr_idx;
- break;
- case SQFS_INODE_EXT_FILE:
- idx = inode->data.file_ext.xattr_idx;
- break;
- case SQFS_INODE_EXT_SLINK:
- idx = inode->data.slink_ext.xattr_idx;
- break;
- case SQFS_INODE_EXT_BDEV:
- case SQFS_INODE_EXT_CDEV:
- idx = inode->data.dev_ext.xattr_idx;
- break;
- case SQFS_INODE_EXT_FIFO:
- case SQFS_INODE_EXT_SOCKET:
- idx = inode->data.ipc_ext.xattr_idx;
- break;
- default:
- return 0;
- }
-
- return xattr_reader_restore_node(xr, fs, node, idx);
-}
-
-static bool node_would_be_own_parent(tree_node_t *root, tree_node_t *n)
-{
- while (root != NULL) {
- if (root->inode_num == n->inode_num)
- return true;
-
- root = root->parent;
- }
-
- return false;
-}
-
-static int fill_dir(meta_reader_t *ir, meta_reader_t *dr, tree_node_t *root,
- sqfs_super_t *super, id_table_t *idtbl, fstree_t *fs,
- xattr_reader_t *xr, int flags)
-{
- sqfs_inode_generic_t *inode;
- sqfs_dir_header_t hdr;
- sqfs_dir_entry_t *ent;
- tree_node_t *n, *prev;
- uint64_t block_start;
- size_t size, diff;
- uint32_t i;
-
- size = root->data.dir->size;
- if (size <= sizeof(hdr))
- return 0;
-
- block_start = root->data.dir->start_block;
- block_start += super->directory_table_start;
-
- if (meta_reader_seek(dr, block_start, root->data.dir->block_offset))
- return -1;
-
- while (size > sizeof(hdr)) {
- if (meta_reader_read_dir_header(dr, &hdr))
- return -1;
-
- size -= sizeof(hdr);
-
- for (i = 0; i <= hdr.count && size > sizeof(*ent); ++i) {
- ent = meta_reader_read_dir_ent(dr);
- if (ent == NULL)
- return -1;
-
- diff = sizeof(*ent) + strlen((char *)ent->name);
- if (diff > size) {
- free(ent);
- break;
- }
- size -= diff;
-
- if (should_skip(ent->type, flags)) {
- free(ent);
- continue;
- }
-
- inode = meta_reader_read_inode(ir, super,
- hdr.start_block,
- ent->offset);
- if (inode == NULL) {
- free(ent);
- return -1;
- }
-
- n = tree_node_from_inode(inode, idtbl,
- (char *)ent->name,
- super->block_size);
-
- if (n == NULL) {
- free(ent);
- free(inode);
- return -1;
- }
-
- if (node_would_be_own_parent(root, n)) {
- fputs("WARNING: Found a directory that "
- "contains itself, skipping loop back "
- "reference!\n", stderr);
- free(n);
- free(ent);
- free(inode);
- continue;
- }
-
- if (flags & RDTREE_READ_XATTR) {
- if (restore_xattr(xr, fs, n, inode)) {
- free(n);
- free(ent);
- free(inode);
- return -1;
- }
- }
-
- free(ent);
- free(inode);
-
- n->parent = root;
- n->next = root->data.dir->children;
- root->data.dir->children = n;
- }
- }
-
- n = root->data.dir->children;
- prev = NULL;
-
- while (n != NULL) {
- if (S_ISDIR(n->mode)) {
- if (fill_dir(ir, dr, n, super, idtbl, fs, xr, flags))
- return -1;
-
- if (n->data.dir->children == NULL &&
- (flags & RDTREE_NO_EMPTY)) {
- if (prev == NULL) {
- root->data.dir->children = n->next;
- free(n);
- n = root->data.dir->children;
- } else {
- prev->next = n->next;
- free(n);
- n = prev->next;
- }
- continue;
- }
- }
-
- prev = n;
- n = n->next;
- }
-
- return 0;
-}
-
-int deserialize_fstree(fstree_t *out, sqfs_super_t *super, compressor_t *cmp,
- int fd, int flags)
-{
- uint64_t block_start, limit;
- sqfs_inode_generic_t *root;
- meta_reader_t *ir, *dr;
- xattr_reader_t *xr;
- id_table_t idtbl;
- int status = -1;
- size_t offset;
-
- ir = meta_reader_create(fd, cmp, super->inode_table_start,
- super->directory_table_start);
- if (ir == NULL)
- return -1;
-
- limit = super->id_table_start;
- if (super->export_table_start < limit)
- limit = super->export_table_start;
- if (super->fragment_table_start < limit)
- limit = super->fragment_table_start;
-
- dr = meta_reader_create(fd, cmp, super->directory_table_start, limit);
- if (dr == NULL)
- goto out_ir;
-
- if (id_table_init(&idtbl))
- goto out_dr;
-
- if (id_table_read(&idtbl, fd, super, cmp))
- goto out_id;
-
- xr = xattr_reader_create(fd, super, cmp);
- if (xr == NULL)
- goto out_id;
-
- block_start = super->root_inode_ref >> 16;
- offset = super->root_inode_ref & 0xFFFF;
- root = meta_reader_read_inode(ir, super, block_start, offset);
- if (root == NULL)
- goto out_xr;
-
- if (root->base.type != SQFS_INODE_DIR &&
- root->base.type != SQFS_INODE_EXT_DIR) {
- free(root);
- fputs("File system root inode is not a directory inode!\n",
- stderr);
- goto out_xr;
- }
-
- memset(out, 0, sizeof(*out));
- out->block_size = super->block_size;
- out->defaults.st_uid = 0;
- out->defaults.st_gid = 0;
- out->defaults.st_mode = 0755;
- out->defaults.st_mtime = super->modification_time;
-
- out->root = tree_node_from_inode(root, &idtbl, "", super->block_size);
-
- if (out->root == NULL) {
- free(root);
- goto out_xr;
- }
-
- if (flags & RDTREE_READ_XATTR) {
- if (str_table_init(&out->xattr_keys,
- FSTREE_XATTR_KEY_BUCKETS)) {
- free(root);
- goto fail_fs;
- }
-
- if (str_table_init(&out->xattr_values,
- FSTREE_XATTR_VALUE_BUCKETS)) {
- free(root);
- goto fail_fs;
- }
-
- if (restore_xattr(xr, out, out->root, root)) {
- free(root);
- goto fail_fs;
- }
- }
-
- free(root);
-
- if (fill_dir(ir, dr, out->root, super, &idtbl, out, xr, flags))
- goto fail_fs;
-
- tree_node_sort_recursive(out->root);
-
- status = 0;
-out_xr:
- xattr_reader_destroy(xr);
-out_id:
- id_table_cleanup(&idtbl);
-out_dr:
- meta_reader_destroy(dr);
-out_ir:
- meta_reader_destroy(ir);
- return status;
-fail_fs:
- fstree_cleanup(out);
- goto out_xr;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 02:08:15 +0000