extract.c: check for empty extraction list

[wimlib] / src / extract.c

diff --git a/src/extract.c b/src/extract.c
index 0029aa88016097b161ac515f61ffbbacf3c27cff..c61dac764dfc612e36872c099100ca0c643af58f 100644 (file)
--- a/src/extract.c
+++ b/src/extract.c
@@ -8,20 +8,18 @@
 /*
  * Copyright (C) 2012, 2013, 2014 Eric Biggers
  *
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
  *
- * wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 3 of the License, or (at your option)
- * any later version.
- *
- * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  * details.
  *
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
  */
 
 /*
@@ -41,7 +39,13 @@
 #  include "config.h"
 #endif
 
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "wimlib/apply.h"
+#include "wimlib/assert.h"
 #include "wimlib/dentry.h"
 #include "wimlib/encoding.h"
 #include "wimlib/endianness.h"
@@ -61,12 +65,6 @@
 #include "wimlib/wildcard.h"
 #include "wimlib/wim.h"
 
-#include <errno.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
 #define WIMLIB_EXTRACT_FLAG_FROM_PIPE   0x80000000
 #define WIMLIB_EXTRACT_FLAG_IMAGEMODE   0x40000000
 
@@ -739,6 +737,7 @@ destroy_dentry_list(struct list_head *dentry_list)
                inode = dentry->d_inode;
                dentry_reset_extraction_list_node(dentry);
                inode->i_visited = 0;
+               inode->i_can_externally_back = 0;
                if ((void *)dentry->d_extraction_name != (void *)dentry->file_name)
                        FREE(dentry->d_extraction_name);
                dentry->d_extraction_name = NULL;
@@ -1009,7 +1008,7 @@ dentry_list_resolve_streams(struct list_head *dentry_list,
 }
 
 static int
-ref_stream(struct wim_lookup_table_entry *lte, u32 stream_idx,
+ref_stream(struct wim_lookup_table_entry *lte, unsigned stream_idx,
           struct wim_dentry *dentry, struct apply_ctx *ctx)
 {
        struct wim_inode *inode = dentry->d_inode;
@@ -1084,7 +1083,7 @@ ref_unnamed_stream(struct wim_dentry *dentry, struct apply_ctx *ctx)
 {
        struct wim_inode *inode = dentry->d_inode;
        int ret;
-       u16 stream_idx;
+       unsigned stream_idx;
        struct wim_lookup_table_entry *stream;
 
        if (unlikely(inode_is_encrypted_directory(inode)))
@@ -1121,8 +1120,8 @@ dentry_ref_streams(struct wim_dentry *dentry, struct apply_ctx *ctx)
         * extraction mode and volume, and to avoid complications, if not doing
         * a linked extraction.  */
        if (ctx->supported_features.named_data_streams) {
-               for (u16 i = 0; i < inode->i_num_ads; i++) {
-                       if (!ads_entry_is_named_stream(&inode->i_ads_entries[i]))
+               for (unsigned i = 0; i < inode->i_num_ads; i++) {
+                       if (!inode->i_ads_entries[i].stream_name_nbytes)
                                continue;
                        ret = ref_stream(inode->i_ads_entries[i].lte, i + 1,
                                         dentry, ctx);
@@ -1474,16 +1473,21 @@ extract_trees(WIMStruct *wim, struct wim_dentry **trees, size_t num_trees,
        if (ret)
                goto out_cleanup;
 
+       if (unlikely(list_empty(&dentry_list))) {
+               WARNING("There is nothing to extract!");
+               goto out_cleanup;
+       }
+
        ret = dentry_list_resolve_streams(&dentry_list, ctx);
        if (ret)
                goto out_cleanup;
 
+       dentry_list_build_inode_alias_lists(&dentry_list);
+
        ret = dentry_list_ref_streams(&dentry_list, ctx);
        if (ret)
                goto out_cleanup;
 
-       dentry_list_build_inode_alias_lists(&dentry_list);
-
        if (extract_flags & WIMLIB_EXTRACT_FLAG_FROM_PIPE) {
                /* When extracting from a pipe, the number of bytes of data to
                 * extract can't be determined in the normal way (examining the
@@ -2018,7 +2022,7 @@ wimlib_extract_image_from_pipe_with_progress(int pipe_fd,
                if (i == image) {
                        /* Metadata resource is for the image being extracted.
                         * Parse it and save the metadata in memory.  */
-                       ret = read_metadata_resource(pwm, imd);
+                       ret = read_metadata_resource(imd);
                        if (ret)
                                goto out_wimlib_free;
                        imd->modified = 1;