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
25 namespace open_vcdiff {
26
27 typedef uLong VCDChecksum;
28
29 const VCDChecksum kNoPartialChecksum = 0;
30
ComputeAdler32(const char * buffer,size_t size)31 inline 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
UpdateAdler32(VCDChecksum partial_checksum,const char * buffer,size_t size)38 inline 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