crc7.c

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    1 /*
    2  *      crc7.c
    3  *
    4  * This source code is licensed under the GNU General Public License,
    5  * Version 2. See the file COPYING for more details.
    6  */
    7 
    8 #include <linux/types.h>
    9 #include <linux/module.h>
   10 #include <linux/crc7.h>
   11 
   12 
   13 /* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
   14 const u8 crc7_syndrome_table[256] = {
   15         0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
   16         0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
   17         0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
   18         0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
   19         0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
   20         0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
   21         0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
   22         0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
   23         0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
   24         0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
   25         0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
   26         0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
   27         0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
   28         0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
   29         0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
   30         0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
   31         0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
   32         0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
   33         0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
   34         0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
   35         0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
   36         0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
   37         0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
   38         0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
   39         0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
   40         0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
   41         0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
   42         0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
   43         0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
   44         0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
   45         0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
   46         0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
   47 };
   48 EXPORT_SYMBOL(crc7_syndrome_table);
   49 
   50 /**
   51  * crc7 - update the CRC7 for the data buffer
   52  * @crc:     previous CRC7 value
   53  * @buffer:  data pointer
   54  * @len:     number of bytes in the buffer
   55  * Context: any
   56  *
   57  * Returns the updated CRC7 value.
   58  */
   59 u8 crc7(u8 crc, const u8 *buffer, size_t len)
   60 {
   61         while (len--)
   62                 crc = crc7_byte(crc, *buffer++);
   63         return crc;
   64 }
   65 EXPORT_SYMBOL(crc7);
   66 
   67 MODULE_DESCRIPTION("CRC7 calculations");
   68 MODULE_LICENSE("GPL");

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FreeBSD/Linux Kernel Cross Reference sys/lib/crc7.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/crc7.c