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by Clint Adams
Import upstream version 0.1 |
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/**
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* \file crc.c
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* Functions and types for CRC checks.
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*
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* Generated on Sun Oct 24 10:58:31 2010,
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* by pycrc v0.7.6, http://www.tty1.net/pycrc/
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* using the configuration:
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* Width = 32
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* Poly = 0x04c11db7
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* XorIn = 0xffffffff
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* ReflectIn = True
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* XorOut = 0xffffffff
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* ReflectOut = True
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* Algorithm = table-driven
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*****************************************************************************/
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#include "crc.h" |
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#include <stdint.h> |
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#include <stdlib.h> |
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/**
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* Static table used for the table_driven implementation.
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*****************************************************************************/
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static const crc_t crc_table[256] = { |
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, |
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, |
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, |
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, |
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, |
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, |
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, |
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, |
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, |
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, |
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, |
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, |
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, |
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, |
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, |
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, |
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, |
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, |
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, |
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, |
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, |
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, |
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, |
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, |
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, |
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, |
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, |
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, |
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, |
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, |
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, |
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, |
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, |
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, |
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0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, |
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, |
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, |
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0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, |
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, |
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0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, |
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, |
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, |
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0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, |
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, |
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, |
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, |
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, |
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0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, |
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0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, |
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, |
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d |
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};
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/**
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* Reflect all bits of a \a data word of \a data_len bytes.
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*
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* \param data The data word to be reflected.
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* \param data_len The width of \a data expressed in number of bits.
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* \return The reflected data.
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*****************************************************************************/
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crc_t crc_reflect(crc_t data, size_t data_len) |
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{
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unsigned int i; |
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crc_t ret; |
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ret = data & 0x01; |
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for (i = 1; i < data_len; i++) { |
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data >>= 1; |
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ret = (ret << 1) | (data & 0x01); |
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}
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return ret; |
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}
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/**
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* Update the crc value with new data.
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*
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* \param crc The current crc value.
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* \param data Pointer to a buffer of \a data_len bytes.
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* \param data_len Number of bytes in the \a data buffer.
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* \return The updated crc value.
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*****************************************************************************/
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crc_t crc_update(crc_t crc, const unsigned char *data, size_t data_len) |
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{
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unsigned int tbl_idx; |
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while (data_len--) { |
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tbl_idx = (crc ^ *data) & 0xff; |
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crc = (crc_table[tbl_idx] ^ (crc >> 8)) & 0xffffffff; |
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data++; |
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}
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return crc & 0xffffffff; |
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}
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