From 0e7b2348ea8fbfd9cb9fb532d552e27a9636010a Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Fri, 22 Sep 2023 20:46:58 +0200 Subject: libsqfs: Add the path lookup function back to the dir reader Signed-off-by: David Oberhollenzer --- lib/sqfs/src/dir_reader.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) (limited to 'lib') diff --git a/lib/sqfs/src/dir_reader.c b/lib/sqfs/src/dir_reader.c index 6920a7d..29d7c33 100644 --- a/lib/sqfs/src/dir_reader.c +++ b/lib/sqfs/src/dir_reader.c @@ -296,3 +296,78 @@ int sqfs_dir_reader_resolve_inum(sqfs_dir_reader_t *rd, *ref = *((sqfs_u64 *)rbtree_node_value(node)); return 0; } + +int sqfs_dir_reader_resolve_path(sqfs_dir_reader_t *rd, const char *path, + const sqfs_inode_generic_t *root, + sqfs_u64 *out) +{ + bool is_first = true; + + while (path != NULL && *path != '\0') { + sqfs_dir_reader_state_t state; + int ret; + + if (*path == '/') { + while (*path == '/') + ++path; + continue; + } + + if (is_first && root != NULL) { + ret = sqfs_dir_reader_open_dir(rd, root, &state, 0); + } else { + sqfs_inode_generic_t *inode = NULL; + + if (is_first) + *out = rd->super.root_inode_ref; + + ret = sqfs_dir_reader_get_inode(rd, *out, &inode); + if (ret == 0) { + ret = sqfs_dir_reader_open_dir(rd, inode, + &state, 0); + } + + sqfs_free(inode); + } + + is_first = false; + if (ret != 0) + return ret; + + for (;;) { + sqfs_dir_node_t *ent; + size_t len; + + ret = sqfs_dir_reader_read(rd, &state, &ent); + if (ret < 0) + return ret; + if (ret > 0) + return SQFS_ERROR_NO_ENTRY; + + len = ent->size + 1; + ret = strncmp((const char *)ent->name, path, len); + sqfs_free(ent); + + if (ret == 0 && + (path[len] == '/' || path[len] == '\0')) { + path += len; + break; + } + } + + *out = state.ent_ref; + } + + if (is_first) { + if (root == NULL) { + *out = rd->super.root_inode_ref; + return 0; + } + + return sqfs_dir_reader_resolve_inum(rd, + root->base.inode_number, + out); + } + + return 0; +} -- cgit v1.2.3