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CRC32.hpp
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/*
The MIT License (MIT)
PASTA PASTA PASTA PASTA PASTA PASTA PASTA PASTA PASTA PASTA PASTA PASTA
Copyright (c) 2018 Ivor Wanders
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef COMPILE_TIME_CRC_H
#define COMPILE_TIME_CRC_H
#include <cstdint>
#include <type_traits>
// Based on code from Python's crcmod module. Polynomial "crc-32".
// polynomial: 0x104C11DB7, bit reverse algorithm:
// crcmod.Crc(0x104C11DB7, initCrc=0, xorOut=0xFFFFFFFF)
namespace crcdetail
{
static constexpr const uint32_t table[256] =
{
0x00000000U, 0x77073096U, 0xEE0E612CU, 0x990951BAU, 0x076DC419U,
0x706AF48FU, 0xE963A535U, 0x9E6495A3U, 0x0EDB8832U, 0x79DCB8A4U,
0xE0D5E91EU, 0x97D2D988U, 0x09B64C2BU, 0x7EB17CBDU, 0xE7B82D07U,
0x90BF1D91U, 0x1DB71064U, 0x6AB020F2U, 0xF3B97148U, 0x84BE41DEU,
0x1ADAD47DU, 0x6DDDE4EBU, 0xF4D4B551U, 0x83D385C7U, 0x136C9856U,
0x646BA8C0U, 0xFD62F97AU, 0x8A65C9ECU, 0x14015C4FU, 0x63066CD9U,
0xFA0F3D63U, 0x8D080DF5U, 0x3B6E20C8U, 0x4C69105EU, 0xD56041E4U,
0xA2677172U, 0x3C03E4D1U, 0x4B04D447U, 0xD20D85FDU, 0xA50AB56BU,
0x35B5A8FAU, 0x42B2986CU, 0xDBBBC9D6U, 0xACBCF940U, 0x32D86CE3U,
0x45DF5C75U, 0xDCD60DCFU, 0xABD13D59U, 0x26D930ACU, 0x51DE003AU,
0xC8D75180U, 0xBFD06116U, 0x21B4F4B5U, 0x56B3C423U, 0xCFBA9599U,
0xB8BDA50FU, 0x2802B89EU, 0x5F058808U, 0xC60CD9B2U, 0xB10BE924U,
0x2F6F7C87U, 0x58684C11U, 0xC1611DABU, 0xB6662D3DU, 0x76DC4190U,
0x01DB7106U, 0x98D220BCU, 0xEFD5102AU, 0x71B18589U, 0x06B6B51FU,
0x9FBFE4A5U, 0xE8B8D433U, 0x7807C9A2U, 0x0F00F934U, 0x9609A88EU,
0xE10E9818U, 0x7F6A0DBBU, 0x086D3D2DU, 0x91646C97U, 0xE6635C01U,
0x6B6B51F4U, 0x1C6C6162U, 0x856530D8U, 0xF262004EU, 0x6C0695EDU,
0x1B01A57BU, 0x8208F4C1U, 0xF50FC457U, 0x65B0D9C6U, 0x12B7E950U,
0x8BBEB8EAU, 0xFCB9887CU, 0x62DD1DDFU, 0x15DA2D49U, 0x8CD37CF3U,
0xFBD44C65U, 0x4DB26158U, 0x3AB551CEU, 0xA3BC0074U, 0xD4BB30E2U,
0x4ADFA541U, 0x3DD895D7U, 0xA4D1C46DU, 0xD3D6F4FBU, 0x4369E96AU,
0x346ED9FCU, 0xAD678846U, 0xDA60B8D0U, 0x44042D73U, 0x33031DE5U,
0xAA0A4C5FU, 0xDD0D7CC9U, 0x5005713CU, 0x270241AAU, 0xBE0B1010U,
0xC90C2086U, 0x5768B525U, 0x206F85B3U, 0xB966D409U, 0xCE61E49FU,
0x5EDEF90EU, 0x29D9C998U, 0xB0D09822U, 0xC7D7A8B4U, 0x59B33D17U,
0x2EB40D81U, 0xB7BD5C3BU, 0xC0BA6CADU, 0xEDB88320U, 0x9ABFB3B6U,
0x03B6E20CU, 0x74B1D29AU, 0xEAD54739U, 0x9DD277AFU, 0x04DB2615U,
0x73DC1683U, 0xE3630B12U, 0x94643B84U, 0x0D6D6A3EU, 0x7A6A5AA8U,
0xE40ECF0BU, 0x9309FF9DU, 0x0A00AE27U, 0x7D079EB1U, 0xF00F9344U,
0x8708A3D2U, 0x1E01F268U, 0x6906C2FEU, 0xF762575DU, 0x806567CBU,
0x196C3671U, 0x6E6B06E7U, 0xFED41B76U, 0x89D32BE0U, 0x10DA7A5AU,
0x67DD4ACCU, 0xF9B9DF6FU, 0x8EBEEFF9U, 0x17B7BE43U, 0x60B08ED5U,
0xD6D6A3E8U, 0xA1D1937EU, 0x38D8C2C4U, 0x4FDFF252U, 0xD1BB67F1U,
0xA6BC5767U, 0x3FB506DDU, 0x48B2364BU, 0xD80D2BDAU, 0xAF0A1B4CU,
0x36034AF6U, 0x41047A60U, 0xDF60EFC3U, 0xA867DF55U, 0x316E8EEFU,
0x4669BE79U, 0xCB61B38CU, 0xBC66831AU, 0x256FD2A0U, 0x5268E236U,
0xCC0C7795U, 0xBB0B4703U, 0x220216B9U, 0x5505262FU, 0xC5BA3BBEU,
0xB2BD0B28U, 0x2BB45A92U, 0x5CB36A04U, 0xC2D7FFA7U, 0xB5D0CF31U,
0x2CD99E8BU, 0x5BDEAE1DU, 0x9B64C2B0U, 0xEC63F226U, 0x756AA39CU,
0x026D930AU, 0x9C0906A9U, 0xEB0E363FU, 0x72076785U, 0x05005713U,
0x95BF4A82U, 0xE2B87A14U, 0x7BB12BAEU, 0x0CB61B38U, 0x92D28E9BU,
0xE5D5BE0DU, 0x7CDCEFB7U, 0x0BDBDF21U, 0x86D3D2D4U, 0xF1D4E242U,
0x68DDB3F8U, 0x1FDA836EU, 0x81BE16CDU, 0xF6B9265BU, 0x6FB077E1U,
0x18B74777U, 0x88085AE6U, 0xFF0F6A70U, 0x66063BCAU, 0x11010B5CU,
0x8F659EFFU, 0xF862AE69U, 0x616BFFD3U, 0x166CCF45U, 0xA00AE278U,
0xD70DD2EEU, 0x4E048354U, 0x3903B3C2U, 0xA7672661U, 0xD06016F7U,
0x4969474DU, 0x3E6E77DBU, 0xAED16A4AU, 0xD9D65ADCU, 0x40DF0B66U,
0x37D83BF0U, 0xA9BCAE53U, 0xDEBB9EC5U, 0x47B2CF7FU, 0x30B5FFE9U,
0xBDBDF21CU, 0xCABAC28AU, 0x53B39330U, 0x24B4A3A6U, 0xBAD03605U,
0xCDD70693U, 0x54DE5729U, 0x23D967BFU, 0xB3667A2EU, 0xC4614AB8U,
0x5D681B02U, 0x2A6F2B94U, 0xB40BBE37U, 0xC30C8EA1U, 0x5A05DF1BU,
0x2D02EF8DU
};
constexpr uint32_t compute(const char* data, uint32_t len, uint32_t crc = 0) {
crc = crc ^ 0xFFFFFFFFU;
for (uint32_t i = 0; i < len; i++) {
crc = table[(*data ^ crc) & 0xFF] ^ (crc >> 8);
data++;
}
crc = crc ^ 0xFFFFFFFFU;
return crc;
}
constexpr uint32_t compute(const wchar_t* data, uint32_t len, uint32_t crc = 0) {
crc = crc ^ 0xFFFFFFFFU;
for (uint32_t i = 0; i < len; i++) {
crc = table[(*data ^ crc) & 0xFF] ^ (crc >> 8);
data++;
}
crc = crc ^ 0xFFFFFFFFU;
return crc;
}
} // namespace crcdetail
// Macro to be used, guarantees hash is computed at compile time.
#define STATIC_CRC32(A) \
std::integral_constant<uint32_t, crcdetail::compute(A, sizeof(A)-1)>::value
#define RUNTIME_CRC32(B) crcdetail::compute(B, strlen(B))
#define RUNTIME_CRC32_W(B) crcdetail::compute(B, wcslen(B))
#endif // COMPILE_TIME_CRC_H