ChangeLogTag:Sat Nov 30 09:18:51 2002 Douglas C. Schmidt <schmidt@ace.cs.wustl.edu>

2 files changed, 30 insertions, 3 deletions

diff --git a/ace/ACE.cpp b/ace/ACE.cpp
index 8271cdb2c9c..b3492d70c7b 100644
--- a/ace/ACE.cpp
+++ b/ace/ACE.cpp
@@ -473,9 +473,7 @@ ACE::crc32 (const char *buffer, ACE_UINT32 len)
   for (const char *p = buffer;
        p != buffer + len;
        ++p)
-    {
-      COMPUTE (crc, *p);
-    }
+    COMPUTE (crc, *p);
 
   // Include the length of the string.
 
@@ -485,6 +483,31 @@ ACE::crc32 (const char *buffer, ACE_UINT32 len)
   return ~crc;
 }
 
+u_long 
+ACE::crc32 (iovec *iov, int len)
+{
+  register ACE_UINT32 crc = 0;
+
+  int total_len = 0;
+
+  for (int i = 0; i < len; ++i) 
+    {
+      for (const char *p = iov[i].iov_base;
+           p != iov[i].iov_base + iov[i].iov_len;
+           ++p)
+        COMPUTE (crc, *p);
+
+      total_len += iov[i].iov_len;
+    }
+
+  // Include the length of the string.
+
+  for (; total_len != 0; total_len >>= 8)
+    COMPUTE (crc, total_len & 0xff);
+
+  return ~crc;
+}
+
 #undef COMPUTE
 
 #if !defined (ACE_HAS_WINCE)
diff --git a/ace/ACE.h b/ace/ACE.h
index 14fad8aae3a..3fef3fae893 100644
--- a/ace/ACE.h
+++ b/ace/ACE.h
@@ -494,6 +494,10 @@ public:
   /// buffer (the length is included in the CRC).
   static u_long crc32 (const char *buf, ACE_UINT32 len);
 
+  /// Computes the ISO 8802-3 standard 32 bits CRC for the 
+  /// @ len iovec buffers.
+  static u_long crc32 (iovec *iov, int len);
+
   /// Euclid's greatest common divisor algorithm.
   static u_long gcd (u_long x, u_long y);