From ef49c3486a19368f444d55ed48dabb26751d8be9 Mon Sep 17 00:00:00 2001
From: Andreas Steffen <andreas.steffen@strongswan.org>
Date: Tue, 27 Mar 2007 04:37:15 +0000
Subject: added chunk_compare() which compares orders chunks

---
 src/libstrongswan/chunk.c | 15 +++++++++++++++
 src/libstrongswan/chunk.h |  6 ++++++
 2 files changed, 21 insertions(+)

(limited to 'src')

diff --git a/src/libstrongswan/chunk.c b/src/libstrongswan/chunk.c
index f2c8a3efb..1967b350a 100644
--- a/src/libstrongswan/chunk.c
+++ b/src/libstrongswan/chunk.c
@@ -230,6 +230,21 @@ chunk_t chunk_skip(chunk_t chunk, size_t bytes)
 	return chunk_empty;
 }
 
+/**
+ * Described in header.
+ */
+int chunk_compare(chunk_t a, chunk_t b)
+{
+	int compare_len = a.len - b.len;
+	int len = (compare_len < 0)? a.len : b.len;
+
+	if (compare_len != 0 || len == 0)
+	{
+		return compare_len;
+	}
+	return memcmp(a.ptr, b.ptr, len);
+};
+
 /**
  * Described in header.
  */
diff --git a/src/libstrongswan/chunk.h b/src/libstrongswan/chunk.h
index 7fa257b00..9880ae20f 100644
--- a/src/libstrongswan/chunk.h
+++ b/src/libstrongswan/chunk.h
@@ -123,6 +123,12 @@ void chunk_free(chunk_t *chunk);
  */
 chunk_t chunk_skip(chunk_t chunk, size_t bytes);
 
+/**
+ *  Compare two chunks, returns zero if a equals b
+ *  or negative/positive if a is small/greater than b
+ */
+int chunk_compare(chunk_t a, chunk_t b);
+
 /**
  * Compare two chunks for equality,
  * NULL chunks are never equal.
-- 
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