crc32.c 9.9 KB

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  1. /*
  2. * This file is derived from crc32.c from the zlib-1.1.3 distribution
  3. * by Jean-loup Gailly and Mark Adler.
  4. */
  5. /* crc32.c -- compute the CRC-32 of a data stream
  6. * Copyright (C) 1995-1998 Mark Adler
  7. * For conditions of distribution and use, see copyright notice in zlib.h
  8. */
  9. #ifndef USE_HOSTCC
  10. #include <common.h>
  11. #endif
  12. #include <compiler.h>
  13. #include <u-boot/crc.h>
  14. #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
  15. #include <watchdog.h>
  16. #endif
  17. #include "u-boot/zlib.h"
  18. #define local static
  19. #define ZEXPORT /* empty */
  20. #define tole(x) cpu_to_le32(x)
  21. #ifdef DYNAMIC_CRC_TABLE
  22. local int crc_table_empty = 1;
  23. local uint32_t crc_table[256];
  24. local void make_crc_table OF((void));
  25. /*
  26. Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
  27. 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.
  28. Polynomials over GF(2) are represented in binary, one bit per coefficient,
  29. with the lowest powers in the most significant bit. Then adding polynomials
  30. is just exclusive-or, and multiplying a polynomial by x is a right shift by
  31. one. If we call the above polynomial p, and represent a byte as the
  32. polynomial q, also with the lowest power in the most significant bit (so the
  33. byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
  34. where a mod b means the remainder after dividing a by b.
  35. This calculation is done using the shift-register method of multiplying and
  36. taking the remainder. The register is initialized to zero, and for each
  37. incoming bit, x^32 is added mod p to the register if the bit is a one (where
  38. x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
  39. x (which is shifting right by one and adding x^32 mod p if the bit shifted
  40. out is a one). We start with the highest power (least significant bit) of
  41. q and repeat for all eight bits of q.
  42. The table is simply the CRC of all possible eight bit values. This is all
  43. the information needed to generate CRC's on data a byte at a time for all
  44. combinations of CRC register values and incoming bytes.
  45. */
  46. local void make_crc_table()
  47. {
  48. uint32_t c;
  49. int n, k;
  50. uLong poly; /* polynomial exclusive-or pattern */
  51. /* terms of polynomial defining this crc (except x^32): */
  52. static const Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
  53. /* make exclusive-or pattern from polynomial (0xedb88320L) */
  54. poly = 0L;
  55. for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
  56. poly |= 1L << (31 - p[n]);
  57. for (n = 0; n < 256; n++)
  58. {
  59. c = (uLong)n;
  60. for (k = 0; k < 8; k++)
  61. c = c & 1 ? poly ^ (c >> 1) : c >> 1;
  62. crc_table[n] = tole(c);
  63. }
  64. crc_table_empty = 0;
  65. }
  66. #else
  67. /* ========================================================================
  68. * Table of CRC-32's of all single-byte values (made by make_crc_table)
  69. */
  70. local const uint32_t crc_table[256] = {
  71. tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
  72. tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
  73. tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
  74. tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
  75. tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
  76. tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
  77. tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
  78. tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
  79. tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
  80. tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
  81. tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
  82. tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
  83. tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
  84. tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
  85. tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
  86. tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
  87. tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
  88. tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
  89. tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
  90. tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
  91. tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
  92. tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
  93. tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
  94. tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
  95. tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
  96. tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
  97. tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
  98. tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
  99. tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
  100. tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
  101. tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
  102. tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
  103. tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
  104. tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
  105. tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
  106. tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
  107. tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
  108. tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
  109. tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
  110. tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
  111. tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
  112. tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
  113. tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
  114. tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
  115. tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
  116. tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
  117. tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
  118. tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
  119. tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
  120. tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
  121. tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
  122. tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
  123. tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
  124. tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
  125. tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
  126. tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
  127. tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
  128. tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
  129. tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
  130. tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
  131. tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
  132. tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
  133. tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
  134. tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL)
  135. };
  136. #endif
  137. #if 0
  138. /* =========================================================================
  139. * This function can be used by asm versions of crc32()
  140. */
  141. const uint32_t * ZEXPORT get_crc_table()
  142. {
  143. #ifdef DYNAMIC_CRC_TABLE
  144. if (crc_table_empty) make_crc_table();
  145. #endif
  146. return (const uint32_t *)crc_table;
  147. }
  148. #endif
  149. /* ========================================================================= */
  150. # ifdef __LITTLE_ENDIAN
  151. # define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
  152. # else
  153. # define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
  154. # endif
  155. /* ========================================================================= */
  156. /* No ones complement version. JFFS2 (and other things ?)
  157. * don't use ones compliment in their CRC calculations.
  158. */
  159. uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
  160. {
  161. const uint32_t *tab = crc_table;
  162. const uint32_t *b =(const uint32_t *)buf;
  163. size_t rem_len;
  164. #ifdef DYNAMIC_CRC_TABLE
  165. if (crc_table_empty)
  166. make_crc_table();
  167. #endif
  168. crc = cpu_to_le32(crc);
  169. /* Align it */
  170. if (((long)b) & 3 && len) {
  171. uint8_t *p = (uint8_t *)b;
  172. do {
  173. DO_CRC(*p++);
  174. } while ((--len) && ((long)p)&3);
  175. b = (uint32_t *)p;
  176. }
  177. rem_len = len & 3;
  178. len = len >> 2;
  179. for (--b; len; --len) {
  180. /* load data 32 bits wide, xor data 32 bits wide. */
  181. crc ^= *++b; /* use pre increment for speed */
  182. DO_CRC(0);
  183. DO_CRC(0);
  184. DO_CRC(0);
  185. DO_CRC(0);
  186. }
  187. len = rem_len;
  188. /* And the last few bytes */
  189. if (len) {
  190. uint8_t *p = (uint8_t *)(b + 1) - 1;
  191. do {
  192. DO_CRC(*++p); /* use pre increment for speed */
  193. } while (--len);
  194. }
  195. return le32_to_cpu(crc);
  196. }
  197. #undef DO_CRC
  198. uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *p, uInt len)
  199. {
  200. return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
  201. }
  202. /*
  203. * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
  204. * of input.
  205. */
  206. uint32_t ZEXPORT crc32_wd (uint32_t crc,
  207. const unsigned char *buf,
  208. uInt len, uInt chunk_sz)
  209. {
  210. #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
  211. const unsigned char *end, *curr;
  212. int chunk;
  213. curr = buf;
  214. end = buf + len;
  215. while (curr < end) {
  216. chunk = end - curr;
  217. if (chunk > chunk_sz)
  218. chunk = chunk_sz;
  219. crc = crc32 (crc, curr, chunk);
  220. curr += chunk;
  221. WATCHDOG_RESET ();
  222. }
  223. #else
  224. crc = crc32 (crc, buf, len);
  225. #endif
  226. return crc;
  227. }