* Add new algorithm based on diff algorithm to compare relatively short text parts

1 files changed, 49 insertions, 0 deletions

diff --git a/src/diff.h b/src/diff.h
new file mode 100644
index 000000000..b1c5426d2
--- /dev/null
+++ b/src/diff.h
@@ -0,0 +1,49 @@
+/* Copyright (c) 2010, Vsevolod Stakhov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *       * Redistributions of source code must retain the above copyright
+ *         notice, this list of conditions and the following disclaimer.
+ *       * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED ''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 Rambler 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.
+ */
+
+
+#ifndef DIFF_H_
+#define DIFF_H_
+
+#include "config.h"
+#include "fstring.h"
+
+typedef enum
+{
+	DIFF_MATCH = 1,
+	DIFF_DELETE,
+	DIFF_INSERT
+} diff_op;
+
+struct diff_edit
+{
+	gshort op;
+	gint off; /* off ginto s1 if MATCH or DELETE but s2 if INSERT */
+	gint len;
+};
+
+gint rspamd_diff(const void *a, gint aoff, gint n, const void *b, gint boff, gint m,
+		gint dmax, GArray *ses, gint *sn);
+guint32 compare_diff_distance (f_str_t *s1, f_str_t *s2);
+
+#endif /* DIFF_H_ */