Libosmium 2.22.0 Fast and flexible C++ library for working with OpenStreetMap data

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crc_zlib.hpp
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1#ifndef OSMIUM_OSM_CRC_ZLIB_HPP
2#define OSMIUM_OSM_CRC_ZLIB_HPP
3
4/*
5
6 This file is part of Osmium (https://osmcode.org/libosmium).
7
8 Copyright 2013-2025 Jochen Topf <jochen@topf.org> and others (see README).
9
10 Boost Software License - Version 1.0 - August 17th, 2003
11
12 Permission is hereby granted, free of charge, to any person or organization
13 obtaining a copy of the software and accompanying documentation covered by
14 this license (the "Software") to use, reproduce, display, distribute,
15 execute, and transmit the Software, and to prepare derivative works of the
16 Software, and to permit third-parties to whom the Software is furnished to
17 do so, all subject to the following:
18
19 The copyright notices in the Software and this entire statement, including
20 the above license grant, this restriction and the following disclaimer,
21 must be included in all copies of the Software, in whole or in part, and
22 all derivative works of the Software, unless such copies or derivative
23 works are solely in the form of machine-executable object code generated by
24 a source language processor.
25
26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32 DEALINGS IN THE SOFTWARE.
33
34*/
35
36#include <zlib.h>
37
38#include <cstddef>
39
40 namespace osmium {
41
55 class CRC_zlib {
56
57 unsigned long m_crc32 = ::crc32(0, nullptr, 0); // NOLINT(google-runtime-int)
58
59 public:
60
61 void process_byte(const unsigned char byte) noexcept {
62 m_crc32 = ::crc32(m_crc32, &byte, 1U);
63 }
64
65 void process_bytes(const void* buffer, std::size_t byte_count) noexcept {
66 m_crc32 = ::crc32(m_crc32, reinterpret_cast<const unsigned char*>(buffer), static_cast<unsigned int>(byte_count));
67 }
68
69 unsigned long checksum() const noexcept { // NOLINT(google-runtime-int)
70 return m_crc32;
71 }
72
73 }; // class CRC_zlib
74
75} // namespace osmium
76
77#endif // OSMIUM_OSM_CRC_ZLIB_HPP
osmium::CRC_zlib
Definition crc_zlib.hpp:55
osmium::CRC_zlib::process_byte
void process_byte(const unsigned char byte) noexcept
Definition crc_zlib.hpp:61
osmium::CRC_zlib::checksum
unsigned long checksum() const noexcept
Definition crc_zlib.hpp:69
osmium::CRC_zlib::process_bytes
void process_bytes(const void *buffer, std::size_t byte_count) noexcept
Definition crc_zlib.hpp:65
osmium::CRC_zlib::m_crc32
unsigned long m_crc32
Definition crc_zlib.hpp:57
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53