Add file size fields check.

Also add comment about what those fields probably mean.

diff --git a/libexfat/node.c b/libexfat/node.c
index 6f2f51d..adeec73 100644 (file)
--- a/libexfat/node.c
+++ b/libexfat/node.c
@@ -208,6 +208,18 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
                        file_info = (const struct exfat_file_info*) entry;
                        init_node_meta2(*node, file_info);
                        actual_checksum = exfat_add_checksum(entry, actual_checksum);
+                       /* There are two fields that contain file size. Maybe they plan
+                          to add compression support in the future and one of those
+                          fields is visible (uncompressed) size and the other is real
+                          (compressed) size. Anyway, currently it looks like exFAT does
+                          not support compression and both fields must be equal. */
+                       if (le64_to_cpu(file_info->real_size) != (*node)->size)
+                       {
+                               exfat_error("real size does not equal to size "
+                                               "(%"PRIu64" != %"PRIu64")",
+                                               le64_to_cpu(file_info->real_size), (*node)->size);
+                               goto error;
+                       }
                        /* directories must be aligned on at cluster boundary */
                        if (((*node)->flags & EXFAT_ATTRIB_DIR) &&
                                (*node)->size % CLUSTER_SIZE(*ef->sb) != 0)