First Commit

3rdparty/libzip/lib/zip_unchange.c

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+/*
+  zip_unchange.c -- undo changes to file in zip archive
+  Copyright (C) 1999-2022 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <info@libzip.org>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+  3. The names of the authors may not be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include <stdlib.h>
+
+#include "zipint.h"
+
+
+ZIP_EXTERN int
+zip_unchange(zip_t *za, zip_uint64_t idx) {
+    return _zip_unchange(za, idx, 0);
+}
+
+
+int
+_zip_unchange(zip_t *za, zip_uint64_t idx, int allow_duplicates) {
+    zip_int64_t i;
+    bool renamed;
+
+    if (idx >= za->nentry) {
+        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+        return -1;
+    }
+
+    renamed = za->entry[idx].changes && (za->entry[idx].changes->changed & ZIP_DIRENT_FILENAME);
+    if (!allow_duplicates && (renamed || za->entry[idx].deleted)) {
+        const char *orig_name = NULL;
+        const char *changed_name = NULL;
+
+        if (za->entry[idx].orig != NULL) {
+            if ((orig_name = _zip_get_name(za, idx, ZIP_FL_UNCHANGED, &za->error)) == NULL) {
+                return -1;
+            }
+
+            i = _zip_name_locate(za, orig_name, 0, NULL);
+            if (i >= 0 && (zip_uint64_t)i != idx) {
+                zip_error_set(&za->error, ZIP_ER_EXISTS, 0);
+                return -1;
+            }
+        }
+
+        if (renamed) {
+            if ((changed_name = _zip_get_name(za, idx, 0, &za->error)) == NULL) {
+                return -1;
+            }
+        }
+
+        if (orig_name) {
+            if (_zip_hash_add(za->names, (const zip_uint8_t *)orig_name, idx, 0, &za->error) == false) {
+                return -1;
+            }
+        }
+        if (changed_name) {
+            if (_zip_hash_delete(za->names, (const zip_uint8_t *)changed_name, &za->error) == false) {
+                _zip_hash_delete(za->names, (const zip_uint8_t *)orig_name, NULL);
+                return -1;
+            }
+        }
+    }
+
+    _zip_dirent_free(za->entry[idx].changes);
+    za->entry[idx].changes = NULL;
+
+    _zip_unchange_data(za->entry + idx);
+
+    return 0;
+}