Merge sdch/open-vcdiff from http://git.chromium.org/external/open-vcdiff.git at 438f2a5be6d809bc21611a94cd37bfc8c28ceb33

This commit was generated by merge-from-chromium.py.

Change-Id: I10bf1f306f3f7d57cef2a7a4a67a22a35fa7b188

1 files changed, 48 insertions, 0 deletions

diff --git a/src/checksum.h b/src/checksum.h
new file mode 100644
index 0000000..0d315a1
--- /dev/null
+++ b/src/checksum.h
@@ -0,0 +1,48 @@
+// Copyright 2008 Google Inc.
+// Author: Lincoln Smith
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// A wrapper for the adler32() function from zlib.  This can be replaced
+// with another checksum implementation if desired.
+
+#ifndef OPEN_VCDIFF_CHECKSUM_H_
+#define OPEN_VCDIFF_CHECKSUM_H_
+
+#include <config.h>
+#include "zlib.h"
+
+namespace open_vcdiff {
+
+typedef uLong VCDChecksum;
+
+const VCDChecksum kNoPartialChecksum = 0;
+
+inline VCDChecksum ComputeAdler32(const char* buffer,
+                                  size_t size) {
+  return adler32(kNoPartialChecksum,
+                 reinterpret_cast<const Bytef*>(buffer),
+                 static_cast<uInt>(size));
+}
+
+inline VCDChecksum UpdateAdler32(VCDChecksum partial_checksum,
+                                 const char* buffer,
+                                 size_t size) {
+  return adler32(partial_checksum,
+                 reinterpret_cast<const Bytef*>(buffer),
+                 static_cast<uInt>(size));
+}
+
+}  // namespace open_vcdiff
+
+#endif  // OPEN_VCDIFF_CHECKSUM_H_