Clean up pipable WIM extraction

[wimlib] / src / blob_table.c

diff --git a/src/blob_table.c b/src/blob_table.c
index 08859c42787baa5147a398bdacdecae579f69275..d2ece47ba471af1c67f37d62e8371401eeed8d52 100644 (file)
--- a/src/blob_table.c
+++ b/src/blob_table.c
@@ -856,6 +856,7 @@ read_blob_table(WIMStruct *wim)
        struct blob_table *table = NULL;
        struct blob_descriptor *cur_blob = NULL;
        size_t num_duplicate_blobs = 0;
+       size_t num_empty_blobs = 0;
        size_t num_wrong_part_blobs = 0;
        u32 image_index = 0;
        struct wim_resource_descriptor **cur_solid_rdescs = NULL;
@@ -953,27 +954,13 @@ read_blob_table(WIMStruct *wim)
                                        goto out;
                        }
 
-                       /* How to handle an uncompressed resource with its
-                        * uncompressed size different from its compressed size?
-                        *
-                        * Based on a simple test, WIMGAPI seems to handle this
-                        * as follows:
-                        *
-                        * if (size_in_wim > uncompressed_size) {
-                        *      Ignore uncompressed_size; use size_in_wim
-                        *      instead.
-                        * } else {
-                        *      Honor uncompressed_size, but treat the part of
-                        *      the file data above size_in_wim as all zeros.
-                        * }
-                        *
-                        * So we will do the same.  */
-                       if (unlikely(!(reshdr.flags &
-                                      WIM_RESHDR_FLAG_COMPRESSED) &&
-                                    (reshdr.size_in_wim >
-                                     reshdr.uncompressed_size)))
+                       if (unlikely(!(reshdr.flags & WIM_RESHDR_FLAG_COMPRESSED) &&
+                                    (reshdr.size_in_wim != reshdr.uncompressed_size)))
                        {
-                               reshdr.uncompressed_size = reshdr.size_in_wim;
+                               ERROR("Uncompressed resource has "
+                                     "size_in_wim != uncompressed_size");
+                               ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
+                               goto out;
                        }
 
                        /* Set up a resource descriptor for this blob.  */
@@ -990,12 +977,18 @@ read_blob_table(WIMStruct *wim)
                /* cur_blob is now a blob bound to a resource.  */
 
                /* Ignore entries with all zeroes in the hash field.  */
-               if (is_zero_hash(cur_blob->hash))
+               if (unlikely(is_zero_hash(cur_blob->hash)))
+                       goto free_cur_blob_and_continue;
+
+               /* Verify that the blob has nonzero size.  */
+               if (unlikely(cur_blob->size == 0)) {
+                       num_empty_blobs++;
                        goto free_cur_blob_and_continue;
+               }
 
                /* Verify that the part number matches that of the underlying
                 * WIM file.  */
-               if (part_number != wim->hdr.part_number) {
+               if (unlikely(part_number != wim->hdr.part_number)) {
                        num_wrong_part_blobs++;
                        goto free_cur_blob_and_continue;
                }
@@ -1098,6 +1091,9 @@ read_blob_table(WIMStruct *wim)
        if (num_duplicate_blobs > 0)
                WARNING("Ignoring %zu duplicate blobs", num_duplicate_blobs);
 
+       if (num_empty_blobs > 0)
+               WARNING("Ignoring %zu empty blobs", num_empty_blobs);
+
        if (num_wrong_part_blobs > 0) {
                WARNING("Ignoring %zu blobs with wrong part number",
                        num_wrong_part_blobs);