openvcdiff | 311c714 | 2008-08-26 19:29:25 +0000 | [diff] [blame] | 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 | |
| 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 | |
| 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_ |