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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-04-16 22:05:36 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-04-17 12:21:09 +0200
commitb178c36ece2cacdc188c0af43f6700d070cf7168 (patch)
tree88c40a309c94b5c648c78d46177578a8ece46858 /bin/gensquashfs
parent013fcc9475968675587828bfc9d633e181263c0c (diff)
Implement a version of the directory iterator for Unix
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'bin/gensquashfs')
-rw-r--r--bin/gensquashfs/src/fstree_from_dir.c138
1 files changed, 52 insertions, 86 deletions
diff --git a/bin/gensquashfs/src/fstree_from_dir.c b/bin/gensquashfs/src/fstree_from_dir.c
index c097304..b8b229b 100644
--- a/bin/gensquashfs/src/fstree_from_dir.c
+++ b/bin/gensquashfs/src/fstree_from_dir.c
@@ -37,6 +37,15 @@ static bool should_skip(const char *name, sqfs_u16 mode, unsigned int flags)
return false;
}
+static sqfs_u32 clamp_timestamp(sqfs_s64 ts)
+{
+ if (ts < 0)
+ return 0;
+ if (ts > 0x0FFFFFFFFLL)
+ return 0xFFFFFFFF;
+ return ts;
+}
+
#if defined(_WIN32) || defined(__WINDOWS__)
static int add_node(fstree_t *fs, tree_node_t *root,
scan_node_callback cb, void *user,
@@ -69,13 +78,7 @@ static int add_node(fstree_t *fs, tree_node_t *root,
}
if (flags & DIR_SCAN_KEEP_TIME) {
- if (entry->mtime < 0) {
- n->mod_time = 0;
- } else if (entry->mtime > 0x0FFFFFFFFLL) {
- n->mod_time = 0xFFFFFFFF;
- } else {
- n->mod_time = entry->mtime;
- }
+ n->mod_time = clamp_timestamp(entry->mtime);
} else {
n->mod_time = fs->defaults.mtime;
}
@@ -136,116 +139,80 @@ static void discard_node(tree_node_t *root, tree_node_t *n)
free(n);
}
-static char *read_link(const struct stat *sb, int dir_fd, const char *name)
-{
- size_t size;
- char *out;
-
- if ((sizeof(sb->st_size) > sizeof(size_t)) && sb->st_size > SIZE_MAX) {
- errno = EOVERFLOW;
- return NULL;
- }
-
- if (SZ_ADD_OV((size_t)sb->st_size, 1, &size)) {
- errno = EOVERFLOW;
- return NULL;
- }
-
- out = calloc(1, size);
- if (out == NULL)
- return NULL;
-
- if (readlinkat(dir_fd, name, out, (size_t)sb->st_size) < 0) {
- int temp = errno;
- free(out);
- errno = temp;
- return NULL;
- }
-
- out[sb->st_size] = '\0';
- return out;
-}
-
static int scan_dir(fstree_t *fs, tree_node_t *root, const char *path,
scan_node_callback cb, void *user, unsigned int flags)
{
- char *extra = NULL;
- dev_t devstart = 0;
- struct dirent *ent;
- struct stat sb;
- tree_node_t *n;
- DIR *dir;
- int ret;
+ dir_iterator_t *dir;
- dir = opendir(path);
- if (dir == NULL) {
- perror(path);
+ dir = dir_iterator_create(path);
+ if (dir == NULL)
return -1;
- }
-
- if (flags & DIR_SCAN_ONE_FILESYSTEM) {
- if (fstat(dirfd(dir), &sb)) {
- perror(path);
- goto fail;
- }
- devstart = sb.st_dev;
- }
for (;;) {
- errno = 0;
- ent = readdir(dir);
+ dir_entry_t *ent = NULL;
+ tree_node_t *n = NULL;
+ char *extra = NULL;
- if (ent == NULL) {
- if (errno) {
- perror("readdir");
- goto fail;
- }
+ int ret = dir->next(dir, &ent);
+ if (ret > 0)
break;
+ if (ret < 0) {
+ sqfs_drop(dir);
+ return -1;
}
- if (fstatat(dirfd(dir), ent->d_name,
- &sb, AT_SYMLINK_NOFOLLOW)) {
- perror(ent->d_name);
- goto fail;
- }
-
- if (should_skip(ent->d_name, sb.st_mode, flags))
+ if (should_skip(ent->name, ent->mode, flags)) {
+ free(ent);
continue;
+ }
- if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart)
+ if ((flags & DIR_SCAN_ONE_FILESYSTEM) && ent->dev != dir->dev) {
+ free(ent);
continue;
+ }
- if (S_ISLNK(sb.st_mode)) {
- extra = read_link(&sb, dirfd(dir), ent->d_name);
- if (extra == NULL) {
- perror("readlink");
- goto fail;
+ if (S_ISLNK(ent->mode)) {
+ if (dir->read_link(dir, &extra)) {
+ free(ent);
+ return -1;
}
}
if (!(flags & DIR_SCAN_KEEP_TIME))
- sb.st_mtime = fs->defaults.mtime;
+ ent->mtime = fs->defaults.mtime;
- if (S_ISDIR(sb.st_mode) && (flags & DIR_SCAN_NO_DIR)) {
- n = fstree_get_node_by_path(fs, root, ent->d_name,
+ if (S_ISDIR(ent->mode) && (flags & DIR_SCAN_NO_DIR)) {
+ n = fstree_get_node_by_path(fs, root, ent->name,
false, false);
- if (n == NULL)
+ if (n == NULL) {
+ free(ent);
continue;
+ }
ret = 0;
} else {
- n = fstree_mknode(root, ent->d_name,
- strlen(ent->d_name), extra, &sb);
+ struct stat sb;
+
+ memset(&sb, 0, sizeof(sb));
+ sb.st_uid = ent->uid;
+ sb.st_gid = ent->gid;
+ sb.st_mode = ent->mode;
+ sb.st_mtime = clamp_timestamp(ent->mtime);
+
+ n = fstree_mknode(root, ent->name,
+ strlen(ent->name), extra, &sb);
if (n == NULL) {
perror("creating tree node");
+ free(extra);
+ free(ent);
goto fail;
}
ret = (cb == NULL) ? 0 : cb(user, fs, n);
}
+ free(ent);
free(extra);
- extra = NULL;
if (ret < 0)
goto fail;
@@ -254,11 +221,10 @@ static int scan_dir(fstree_t *fs, tree_node_t *root, const char *path,
discard_node(root, n);
}
- closedir(dir);
+ sqfs_drop(dir);
return 0;
fail:
- closedir(dir);
- free(extra);
+ sqfs_drop(dir);
return -1;
}
#endif