*** empty log message ***

1 files changed, 60 insertions, 5 deletions

diff --git a/packet.c b/packet.c
index 5226550..77b5583 100644
--- a/packet.c
+++ b/packet.c
@@ -21,10 +21,15 @@ enet_packet_create (const void * data, size_t dataLength, enet_uint32 flags)
 {
     ENetPacket * packet = (ENetPacket *) enet_malloc (sizeof (ENetPacket));
 
-    packet -> data = (enet_uint8 *) enet_malloc (dataLength);
+    if(flags & ENET_PACKET_FLAG_NO_ALLOCATE)
+      packet -> data = (enet_uint8 *) data;
+    else
+    {
+       packet -> data = (enet_uint8 *) enet_malloc (dataLength);
 
-    if (data != NULL)
-      memcpy (packet -> data, data, dataLength);
+       if (data != NULL)
+         memcpy (packet -> data, data, dataLength);
+    };
 
     packet -> referenceCount = 0;
     packet -> flags = flags;
@@ -39,7 +44,8 @@ enet_packet_create (const void * data, size_t dataLength, enet_uint32 flags)
 void
 enet_packet_destroy (ENetPacket * packet)
 {
-    enet_free (packet -> data);
+    if((packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE) == 0)
+      enet_free (packet -> data);
     enet_free (packet);
 }
 
@@ -54,7 +60,7 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength)
 {
     enet_uint8 * newData;
    
-    if (dataLength <= packet -> dataLength)
+    if (dataLength <= packet -> dataLength || (packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE))
     {
        packet -> dataLength = dataLength;
 
@@ -71,4 +77,53 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength)
     return 0;
 }
 
+static int initializedCRC32 = 0;
+static enet_uint32 crcTable [256];
+
+static void initialize_crc32 ()
+{
+    int byte;
+
+    for (byte = 0; byte < 256; ++ byte)
+    {
+        enet_uint32 crc = byte << 24;
+        int offset;
+
+        for(offset = 0; offset < 8; ++ offset)
+        {
+            if (crc & 0x80000000)
+                crc = (crc << 1) ^ 0x04c11db7;
+            else
+                crc <<= 1;
+        }
+
+        crcTable [byte] = crc;
+    }
+
+    initializedCRC32 = 1;
+}
+    
+enet_uint32
+enet_crc32 (const ENetBuffer * buffers, size_t bufferCount)
+{
+    enet_uint32 crc = 0xFFFFFFFF;
+    
+    if (! initializedCRC32) initialize_crc32 ();
+
+    while (bufferCount -- > 0)
+    {
+        const enet_uint8 * data = (const enet_uint8 *) buffers -> data,
+                         * dataEnd = & data [buffers -> dataLength];
+
+        while (data < dataEnd)
+        {
+            crc = ((crc << 8) | * data ++) ^ crcTable [crc >> 24];        
+        }
+
+        ++ buffers;
+    }
+
+    return ENET_HOST_TO_NET_32 (~ crc);
+}
+
 /** @} */