add uTP support for outbound connections

1 files changed, 54 insertions, 0 deletions

diff --git a/src/libutp/utp_hash.cpp b/src/libutp/utp_hash.cpp
new file mode 100644
index 00000000..895c5140
--- /dev/null
+++ b/src/libutp/utp_hash.cpp
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2010-2013 BitTorrent, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "utp_hash.h"
+#include "utp_types.h"
+
+#ifdef STRICT_ALIGN
+inline uint32 Read32(const void *p)
+{
+	uint32 tmp;
+	memcpy(&tmp, p, sizeof tmp);
+	return tmp;
+}
+#else
+inline uint32 Read32(const void *p) { return *(uint32*)p; }
+#endif
+
+uint utp_hash_mem(const void *keyp, size_t keysize)
+{
+	uint hash = 0;
+	uint n = keysize;
+	while (n >= 4) {
+		hash ^= Read32(keyp);
+		keyp = (byte*)keyp + sizeof(uint32);
+		hash = (hash << 13) | (hash >> 19);
+		n -= 4;
+	}
+	while (n != 0) {
+		hash ^= *(byte*)keyp;
+		keyp = (byte*)keyp + sizeof(byte);
+		hash = (hash << 8) | (hash >> 24);
+		n--;
+	}
+	return hash;
+}