aboutsummaryrefslogtreecommitdiff
path: root/fiv-thumbnail.c
diff options
context:
space:
mode:
Diffstat (limited to 'fiv-thumbnail.c')
-rw-r--r--fiv-thumbnail.c29
1 files changed, 27 insertions, 2 deletions
diff --git a/fiv-thumbnail.c b/fiv-thumbnail.c
index 15a78f1..803296c 100644
--- a/fiv-thumbnail.c
+++ b/fiv-thumbnail.c
@@ -25,6 +25,7 @@
#include <errno.h>
#include <math.h>
#include <stdbool.h>
+#include <string.h>
#include "fiv-io.h"
#include "fiv-thumbnail.h"
@@ -93,7 +94,7 @@ mark_thumbnail_lq(cairo_surface_t *surface)
surface, &fiv_thumbnail_key_lq, (void *) (intptr_t) 1, NULL);
}
-gchar *
+static gchar *
fiv_thumbnail_get_root(void)
{
gchar *cache_dir = get_xdg_home_dir("XDG_CACHE_HOME", ".cache");
@@ -102,6 +103,23 @@ fiv_thumbnail_get_root(void)
return thumbnails_dir;
}
+static gboolean
+might_be_a_thumbnail(const char *path_or_uri)
+{
+ // It is generally difficult to discern case in/sensitivity of subpaths,
+ // so err on the side of false positives.
+ gchar *normalized = g_ascii_strdown(path_or_uri, -1);
+
+ // The Windows path separator must be percent-encoded in URIs,
+ // and the file scheme always uses forward slashes.
+ if (G_DIR_SEPARATOR != '/')
+ g_strdelimit(normalized, G_DIR_SEPARATOR_S, '/');
+
+ gboolean matches = strstr(normalized, "/.cache/thumbnails/") != NULL;
+ g_free(normalized);
+ return matches;
+}
+
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static cairo_surface_t *
@@ -440,8 +458,10 @@ fiv_thumbnail_produce(GFile *target, FivThumbnailSize max_size, GError **error)
g_return_val_if_fail(max_size >= FIV_THUMBNAIL_SIZE_MIN &&
max_size <= FIV_THUMBNAIL_SIZE_MAX, FALSE);
+ // Don't save thumbnails for FUSE mounts, such as sftp://.
+ // Moreover, it doesn't make sense to save thumbnails of thumbnails.
const gchar *path = g_file_peek_path(target);
- if (!path || !g_file_is_native(target) /* Don't save sftp://. */)
+ if (!path || !g_file_is_native(target) || might_be_a_thumbnail(path))
return produce_fallback(target, max_size, error);
// Make the TOCTTOU issue favour unnecessary reloading.
@@ -620,6 +640,11 @@ fiv_thumbnail_lookup(const char *uri, gint64 mtime_msec, FivThumbnailSize size)
g_return_val_if_fail(size >= FIV_THUMBNAIL_SIZE_MIN &&
size <= FIV_THUMBNAIL_SIZE_MAX, NULL);
+ // Don't waste time looking up something that shouldn't exist--
+ // thumbnail directories tend to get huge, and syscalls are expensive.
+ if (might_be_a_thumbnail(uri))
+ return NULL;
+
gchar *sum = g_compute_checksum_for_string(G_CHECKSUM_MD5, uri, -1);
gchar *thumbnails_dir = fiv_thumbnail_get_root();