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/release/src-rt/rts/src/crc.c

https://gitlab.com/envieidoc/advancedtomato2
C | 290 lines | 189 code | 16 blank | 85 comment | 5 complexity | 6f770966dfd29ef2838e0e0928e6556c MD5 | raw file
  1. /*******************************************************************************
  2. * $Id: crc.c,v 1.1.1.1 2008/07/21 09:20:37 james26_jang Exp $
  3. * Copyright 2006, Broadcom Corporation
  4. * All Rights Reserved.
  5. *
  6. * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  7. * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  8. * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  9. * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  10. * crc.c: utility function to compute various CRCs
  11. ******************************************************************************/
  12. #include "typedefs.h"
  13. #include "rts/crc.h"
  14. /*******************************************************************************
  15. * hcs
  16. *
  17. * Computes and inserts a header check sum based on crc8 polynomial
  18. * below. Unlike a typical crc, the header check sum is inserted 13
  19. * bytes from the end of the byte stream (rather than appended to the
  20. * end of the byte stream) such that at the receiver a normal checksum
  21. * computation over all of the bytes results in a known good value.
  22. * Given a constant 12 bytes after the header checksum to the end of
  23. * the header, a lookup table can be used to provide the actual value
  24. * inserted.
  25. ******************************************************************************/
  26. static uint8 hcs_table[8] = { 0x16, 0x2c, 0x58, 0xb0, 0x37, 0x6e, 0xdc, 0xef};
  27. void
  28. hcs(
  29. uint8 *pheader, /* pointer to array of data to process */
  30. uint nbytes /* number of input data bytes to process */
  31. )
  32. {
  33. uint8 hcs0, hcs1;
  34. int i;
  35. /* run once with zeros in hcs position, 13th byte from the end */
  36. pheader[nbytes - 12 - 1] = 0;
  37. hcs0 = crc8(pheader, nbytes, CRC8_INIT_VALUE);
  38. /* now compute real hcs to insert in place of zeros */
  39. hcs1 = 0;
  40. for (i = 0; i < 8; i++) {
  41. hcs1 ^= ((hcs0 & (1 << i)) != 0 ? hcs_table[i] : 0);
  42. }
  43. pheader[nbytes - 12 - 1] = hcs1 ^ 0xff;
  44. return;
  45. }
  46. /*******************************************************************************
  47. * crc8
  48. *
  49. * Computes a crc8 over the input data using the polynomial:
  50. *
  51. * x^8 + x^7 +x^6 + x^4 + x^2 + 1
  52. *
  53. * The caller provides the initial value (either CRC8_INIT_VALUE
  54. * or the previous returned value) to allow for processing of
  55. * discontiguous blocks of data. When generating the CRC the
  56. * caller is responsible for complementing the final return value
  57. * and inserting it into the byte stream. When checking, a final
  58. * return value of CRC8_GOOD_VALUE indicates a valid CRC.
  59. *
  60. * Reference: Dallas Semiconductor Application Note 27
  61. * Williams, Ross N., "A Painless Guide to CRC Error Detection Algorithms",
  62. * ver 3, Aug 1993, ross@guest.adelaide.edu.au, Rocksoft Pty Ltd.,
  63. * ftp://ftp.rocksoft.com/clients/rocksoft/papers/crc_v3.txt
  64. *
  65. ******************************************************************************/
  66. static uint8 crc8_table[256] = {
  67. 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B,
  68. 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21,
  69. 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF,
  70. 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5,
  71. 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14,
  72. 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E,
  73. 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80,
  74. 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA,
  75. 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95,
  76. 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF,
  77. 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01,
  78. 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B,
  79. 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA,
  80. 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0,
  81. 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E,
  82. 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34,
  83. 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0,
  84. 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A,
  85. 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54,
  86. 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E,
  87. 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF,
  88. 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5,
  89. 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B,
  90. 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61,
  91. 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E,
  92. 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74,
  93. 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA,
  94. 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0,
  95. 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41,
  96. 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B,
  97. 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5,
  98. 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F
  99. };
  100. #define CRC_INNER_LOOP(n, c, x) \
  101. (c) = ((c) >> 8) ^ crc##n##_table[((c) ^ (x)) & 0xff]
  102. uint8
  103. crc8(
  104. uint8 *pdata, /* pointer to array of data to process */
  105. uint nbytes, /* number of input data bytes to process */
  106. uint8 crc /* either CRC8_INIT_VALUE or previous return value */
  107. )
  108. {
  109. while (nbytes-- > 0)
  110. CRC_INNER_LOOP(8, crc, *pdata++);
  111. return crc;
  112. }
  113. /*******************************************************************************
  114. * crc16
  115. *
  116. * Computes a crc16 over the input data using the polynomial:
  117. *
  118. * x^16 + x^12 +x^5 + 1
  119. *
  120. * The caller provides the initial value (either CRC16_INIT_VALUE
  121. * or the previous returned value) to allow for processing of
  122. * discontiguous blocks of data. When generating the CRC the
  123. * caller is responsible for complementing the final return value
  124. * and inserting it into the byte stream. When checking, a final
  125. * return value of CRC16_GOOD_VALUE indicates a valid CRC.
  126. *
  127. * Reference: Dallas Semiconductor Application Note 27
  128. * Williams, Ross N., "A Painless Guide to CRC Error Detection Algorithms",
  129. * ver 3, Aug 1993, ross@guest.adelaide.edu.au, Rocksoft Pty Ltd.,
  130. * ftp://ftp.rocksoft.com/clients/rocksoft/papers/crc_v3.txt
  131. *
  132. ******************************************************************************/
  133. static uint16 crc16_table[256] = {
  134. 0x0000, 0x1189, 0x2312, 0x329B, 0x4624, 0x57AD, 0x6536, 0x74BF,
  135. 0x8C48, 0x9DC1, 0xAF5A, 0xBED3, 0xCA6C, 0xDBE5, 0xE97E, 0xF8F7,
  136. 0x1081, 0x0108, 0x3393, 0x221A, 0x56A5, 0x472C, 0x75B7, 0x643E,
  137. 0x9CC9, 0x8D40, 0xBFDB, 0xAE52, 0xDAED, 0xCB64, 0xF9FF, 0xE876,
  138. 0x2102, 0x308B, 0x0210, 0x1399, 0x6726, 0x76AF, 0x4434, 0x55BD,
  139. 0xAD4A, 0xBCC3, 0x8E58, 0x9FD1, 0xEB6E, 0xFAE7, 0xC87C, 0xD9F5,
  140. 0x3183, 0x200A, 0x1291, 0x0318, 0x77A7, 0x662E, 0x54B5, 0x453C,
  141. 0xBDCB, 0xAC42, 0x9ED9, 0x8F50, 0xFBEF, 0xEA66, 0xD8FD, 0xC974,
  142. 0x4204, 0x538D, 0x6116, 0x709F, 0x0420, 0x15A9, 0x2732, 0x36BB,
  143. 0xCE4C, 0xDFC5, 0xED5E, 0xFCD7, 0x8868, 0x99E1, 0xAB7A, 0xBAF3,
  144. 0x5285, 0x430C, 0x7197, 0x601E, 0x14A1, 0x0528, 0x37B3, 0x263A,
  145. 0xDECD, 0xCF44, 0xFDDF, 0xEC56, 0x98E9, 0x8960, 0xBBFB, 0xAA72,
  146. 0x6306, 0x728F, 0x4014, 0x519D, 0x2522, 0x34AB, 0x0630, 0x17B9,
  147. 0xEF4E, 0xFEC7, 0xCC5C, 0xDDD5, 0xA96A, 0xB8E3, 0x8A78, 0x9BF1,
  148. 0x7387, 0x620E, 0x5095, 0x411C, 0x35A3, 0x242A, 0x16B1, 0x0738,
  149. 0xFFCF, 0xEE46, 0xDCDD, 0xCD54, 0xB9EB, 0xA862, 0x9AF9, 0x8B70,
  150. 0x8408, 0x9581, 0xA71A, 0xB693, 0xC22C, 0xD3A5, 0xE13E, 0xF0B7,
  151. 0x0840, 0x19C9, 0x2B52, 0x3ADB, 0x4E64, 0x5FED, 0x6D76, 0x7CFF,
  152. 0x9489, 0x8500, 0xB79B, 0xA612, 0xD2AD, 0xC324, 0xF1BF, 0xE036,
  153. 0x18C1, 0x0948, 0x3BD3, 0x2A5A, 0x5EE5, 0x4F6C, 0x7DF7, 0x6C7E,
  154. 0xA50A, 0xB483, 0x8618, 0x9791, 0xE32E, 0xF2A7, 0xC03C, 0xD1B5,
  155. 0x2942, 0x38CB, 0x0A50, 0x1BD9, 0x6F66, 0x7EEF, 0x4C74, 0x5DFD,
  156. 0xB58B, 0xA402, 0x9699, 0x8710, 0xF3AF, 0xE226, 0xD0BD, 0xC134,
  157. 0x39C3, 0x284A, 0x1AD1, 0x0B58, 0x7FE7, 0x6E6E, 0x5CF5, 0x4D7C,
  158. 0xC60C, 0xD785, 0xE51E, 0xF497, 0x8028, 0x91A1, 0xA33A, 0xB2B3,
  159. 0x4A44, 0x5BCD, 0x6956, 0x78DF, 0x0C60, 0x1DE9, 0x2F72, 0x3EFB,
  160. 0xD68D, 0xC704, 0xF59F, 0xE416, 0x90A9, 0x8120, 0xB3BB, 0xA232,
  161. 0x5AC5, 0x4B4C, 0x79D7, 0x685E, 0x1CE1, 0x0D68, 0x3FF3, 0x2E7A,
  162. 0xE70E, 0xF687, 0xC41C, 0xD595, 0xA12A, 0xB0A3, 0x8238, 0x93B1,
  163. 0x6B46, 0x7ACF, 0x4854, 0x59DD, 0x2D62, 0x3CEB, 0x0E70, 0x1FF9,
  164. 0xF78F, 0xE606, 0xD49D, 0xC514, 0xB1AB, 0xA022, 0x92B9, 0x8330,
  165. 0x7BC7, 0x6A4E, 0x58D5, 0x495C, 0x3DE3, 0x2C6A, 0x1EF1, 0x0F78
  166. };
  167. uint16
  168. crc16(
  169. uint8 *pdata, /* pointer to array of data to process */
  170. uint nbytes, /* number of input data bytes to process */
  171. uint16 crc /* either CRC16_INIT_VALUE or previous return value */
  172. )
  173. {
  174. while (nbytes-- > 0)
  175. CRC_INNER_LOOP(16, crc, *pdata++);
  176. return crc;
  177. }
  178. /*******************************************************************************
  179. * crc32
  180. *
  181. * Computes a crc32 over the input data using the polynomial:
  182. *
  183. * x^32+x^26+x^23+x^22+x^16+x^12+x^11+X^10+x^8+x^7+x^5+x^4+x^2+x+1
  184. *
  185. * The caller provides the initial value (either CRC32_INIT_VALUE
  186. * or the previous returned value) to allow for processing of
  187. * discontiguous blocks of data. When generating the CRC the
  188. * caller is responsible for complementing the final return value
  189. * and inserting it into the byte stream. When checking, a final
  190. * return value of CRC32_GOOD_VALUE indicates a valid CRC.
  191. *
  192. * Reference: Dallas Semiconductor Application Note 27
  193. * Williams, Ross N., "A Painless Guide to CRC Error Detection Algorithms",
  194. * ver 3, Aug 1993, ross@guest.adelaide.edu.au, Rocksoft Pty Ltd.,
  195. * ftp://ftp.rocksoft.com/clients/rocksoft/papers/crc_v3.txt
  196. *
  197. ******************************************************************************/
  198. static uint32 crc32_table[256] = {
  199. 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  200. 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  201. 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  202. 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  203. 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  204. 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  205. 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  206. 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  207. 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  208. 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  209. 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  210. 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  211. 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  212. 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  213. 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  214. 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  215. 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  216. 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  217. 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  218. 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  219. 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  220. 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  221. 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  222. 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  223. 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  224. 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  225. 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  226. 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  227. 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  228. 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  229. 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  230. 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  231. 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  232. 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  233. 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  234. 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  235. 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  236. 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  237. 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  238. 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  239. 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  240. 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  241. 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  242. 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  243. 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  244. 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  245. 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
  246. 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  247. 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
  248. 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
  249. 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  250. 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
  251. 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
  252. 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  253. 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
  254. 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
  255. 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  256. 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
  257. 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
  258. 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  259. 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
  260. 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
  261. 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  262. 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
  263. };
  264. uint32
  265. crc32(
  266. uint8 *pdata, /* pointer to array of data to process */
  267. uint nbytes, /* number of input data bytes to process */
  268. uint32 crc /* either CRC32_INIT_VALUE or previous return value */
  269. )
  270. {
  271. while (nbytes-- > 0)
  272. CRC_INNER_LOOP(32, crc, *pdata++);
  273. return crc;
  274. }