LCOV - code coverage report
Current view: top level - lib/os - crc32c_sw.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 7 0.0 %
Date: 2022-08-18 11:36:24 Functions: 0 1 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 6 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (c) 2021 Workaround GmbH.
       3                 :            :  *
       4                 :            :  * SPDX-License-Identifier: Apache-2.0
       5                 :            :  */
       6                 :            : 
       7                 :            : #include <sys/crc.h>
       8                 :            : 
       9                 :            : /* crc table generated from polynomial 0x1EDC6F41UL (Castagnoli) */
      10                 :            : static const uint32_t crc32c_table[16] = {
      11                 :            :         0x00000000UL, 0x105EC76FUL, 0x20BD8EDEUL, 0x30E349B1UL,
      12                 :            :         0x417B1DBCUL, 0x5125DAD3UL, 0x61C69362UL, 0x7198540DUL,
      13                 :            :         0x82F63B78UL, 0x92A8FC17UL, 0xA24BB5A6UL, 0xB21572C9UL,
      14                 :            :         0xC38D26C4UL, 0xD3D3E1ABUL, 0xE330A81AUL, 0xF36E6F75UL
      15                 :            : };
      16                 :            : 
      17                 :            : /* This value needs to be XORed with the final crc value once crc for
      18                 :            :  * the entire stream is calculated. This is a requirement of crc32c algo.
      19                 :            :  */
      20                 :            : #define CRC32C_XOR_OUT  0xFFFFFFFFUL
      21                 :            : 
      22                 :            : /* The crc32c algorithm requires the below value as Init value at the
      23                 :            :  * beginning of the stream.
      24                 :            :  */
      25                 :            : #define CRC32C_INIT     0xFFFFFFFFUL
      26                 :            : 
      27                 :          0 : uint32_t crc32_c(uint32_t crc, const uint8_t *data,
      28                 :            :                  size_t len, bool first_pkt, bool last_pkt)
      29                 :            : {
      30         [ #  # ]:          0 :         if (first_pkt) {
      31                 :          0 :                 crc = CRC32C_INIT;
      32                 :            :         }
      33                 :            : 
      34         [ #  # ]:          0 :         for (size_t i = 0; i < len; i++) {
      35                 :          0 :                 crc = crc32c_table[(crc ^ data[i]) & 0x0F] ^ (crc >> 4);
      36                 :          0 :                 crc = crc32c_table[(crc ^ ((uint32_t)data[i] >> 4)) & 0x0F] ^ (crc >> 4);
      37                 :            :         }
      38                 :            : 
      39         [ #  # ]:          0 :         return last_pkt ? (crc ^ CRC32C_XOR_OUT) : crc;
      40                 :            : }

Generated by: LCOV version 1.14