From e0eda4422521a57230d3b1d84152bc6218932d28 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Wed, 7 Oct 2015 11:19:00 +0100
Subject: [PATCH] Add fixed strings comparision routines.

---
 src/libutil/fstring.c  | 75 ++++++++++++++++++++++++++++++++++++++++++
 src/libutil/fstring.h  |  9 +++++
 src/libutil/str_util.c |  2 +-
 3 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/src/libutil/fstring.c b/src/libutil/fstring.c
index 6a1304423..a03121f42 100644
--- a/src/libutil/fstring.c
+++ b/src/libutil/fstring.c
@@ -238,3 +238,78 @@ rspamd_fstring_equal (const rspamd_fstring_t *s1,
 
 	return FALSE;
 }
+
+extern const guchar lc_map[256];
+
+gint
+rspamd_fstring_casecmp (const rspamd_fstring_t *s1,
+		const rspamd_fstring_t *s2)
+{
+	gint ret = 0;
+	gsize leftover = s1->len % 4;
+	guint fp, i;
+	const uint8_t *s, *d;
+	guchar c1, c2, c3, c4;
+	union {
+		guchar c[4];
+		guint32 n;
+	} cmp1, cmp2;
+
+	g_assert (s1 != NULL && s2 != NULL);
+
+	if (s1->len == s2->len) {
+		leftover = s1->len % 4;
+		s = (const uint8_t *) s1->str;
+		d = (const uint8_t *) s2->str;
+		fp = s1->len - leftover;
+
+		for (i = 0; i != fp; i += 4) {
+			c1 = s[i], c2 = s[i + 1], c3 = s[i + 2], c4 = s[i + 3];
+			cmp1.c[0] = lc_map[c1];
+			cmp1.c[1] = lc_map[c2];
+			cmp1.c[2] = lc_map[c3];
+			cmp1.c[3] = lc_map[c4];
+
+			c1 = d[i], c2 = d[i + 1], c3 = d[i + 2], c4 = d[i + 3];
+			cmp2.c[0] = lc_map[c1];
+			cmp2.c[1] = lc_map[c2];
+			cmp2.c[2] = lc_map[c3];
+			cmp2.c[3] = lc_map[c4];
+
+			if (cmp1.n != cmp2.n) {
+				return cmp1.n - cmp2.n;
+			}
+
+			s += 4;
+			d += 4;
+		}
+
+		while (leftover > 0) {
+			if (g_ascii_tolower (*s) != g_ascii_tolower (*d)) {
+				return (*s) - (*d);
+			}
+
+			leftover --;
+			s ++;
+			d ++;
+		}
+	}
+	else {
+		ret = s1->len - s2->len;
+	}
+
+	return ret;
+}
+
+gint
+rspamd_fstring_cmp (const rspamd_fstring_t *s1,
+		const rspamd_fstring_t *s2)
+{
+	g_assert (s1 != NULL && s2 != NULL);
+
+	if (s1->len == s2->len) {
+		return memcmp (s1->str, s2->str, s1->len);
+	}
+
+	return s1->len - s2->len;
+}
\ No newline at end of file
diff --git a/src/libutil/fstring.h b/src/libutil/fstring.h
index 02b92bea3..70d6624d1 100644
--- a/src/libutil/fstring.h
+++ b/src/libutil/fstring.h
@@ -94,4 +94,13 @@ guint32 rspamd_fstrhash_lc (const rspamd_ftok_t *str, gboolean is_utf);
 gboolean rspamd_fstring_equal (const rspamd_fstring_t *s1,
 		const rspamd_fstring_t *s2);
 
+/**
+ * Compare two fixed strings ignoring case
+ */
+gint rspamd_fstring_casecmp (const rspamd_fstring_t *s1,
+		const rspamd_fstring_t *s2);
+
+gint rspamd_fstring_cmp (const rspamd_fstring_t *s1,
+		const rspamd_fstring_t *s2);
+
 #endif
diff --git a/src/libutil/str_util.c b/src/libutil/str_util.c
index d92ceb1ad..f68b975a4 100644
--- a/src/libutil/str_util.c
+++ b/src/libutil/str_util.c
@@ -28,7 +28,7 @@
 #include "mem_pool.h"
 #include "xxhash.h"
 
-static const guchar lc_map[256] = {
+const guchar lc_map[256] = {
 		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
 		0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
 		0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-- 
2.39.5