1// Copyright 2008 Google Inc.
2// Author: Lincoln Smith
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16// A wrapper for the adler32() function from zlib.  This can be replaced
17// with another checksum implementation if desired.
18
19#ifndef OPEN_VCDIFF_CHECKSUM_H_
20#define OPEN_VCDIFF_CHECKSUM_H_
21
22#include <config.h>
23#include "zlib.h"
24
25namespace open_vcdiff {
26
27typedef uLong VCDChecksum;
28
29const VCDChecksum kNoPartialChecksum = 0;
30
31inline VCDChecksum ComputeAdler32(const char* buffer,
32                                  size_t size) {
33  return adler32(kNoPartialChecksum,
34                 reinterpret_cast<const Bytef*>(buffer),
35                 static_cast<uInt>(size));
36}
37
38inline VCDChecksum UpdateAdler32(VCDChecksum partial_checksum,
39                                 const char* buffer,
40                                 size_t size) {
41  return adler32(partial_checksum,
42                 reinterpret_cast<const Bytef*>(buffer),
43                 static_cast<uInt>(size));
44}
45
46}  // namespace open_vcdiff
47
48#endif  // OPEN_VCDIFF_CHECKSUM_H_
49