Check-in rlz code to src\rlz from http://code.google.com/p/rlz/.

rlz/lib/crc32_wrapper.cc

Index: rlz/lib/crc32_wrapper.cc
===================================================================
--- rlz/lib/crc32_wrapper.cc	(revision 0)
+++ rlz/lib/crc32_wrapper.cc	(revision 0)
@@ -0,0 +1,36 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// A wrapper around ZLib's CRC functions to put them in the rlz_lib namespace
+// and use our types.
+
+#include "rlz/lib/assert.h"
+#include "rlz/lib/crc32.h"
+#include "rlz/lib/string_utils.h"
+#include "third_party/zlib/zlib.h"
+
+namespace rlz_lib {
+
+int Crc32(const unsigned char* buf, int length) {
+  return crc32(0L, buf, length);
+}
+
+bool Crc32(const char* text, int* crc) {
+  if (!crc) {
+    ASSERT_STRING("Crc32: crc is NULL.");
+    return false;
+  }
+
+  *crc = 0;
+  for (int i = 0; text[i]; i++) {
+    if (!IsAscii(text[i]))
+      return false;
+
+    *crc = crc32(*crc, reinterpret_cast<const unsigned char*>(text + i), 1);
+  }
+
+  return true;
+}
+
+}  // namespace rlz_lib