added chunk_compare() which compares orders chunks

2 files changed, 21 insertions, 0 deletions

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
@@ -233,6 +233,21 @@ chunk_t chunk_skip(chunk_t chunk, size_t bytes)
 /**
  * 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.
+ */
 bool chunk_equals(chunk_t a, chunk_t b)
 {
 	return a.ptr != NULL  && b.ptr != NULL &&
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
@@ -124,6 +124,12 @@ 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.
  */