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  1. /*++
  2.  
  3. Copyright (c) 1998  Intel Corporation
  4.    
  5. Module Name:
  6.  
  7.     crc.c
  8.  
  9. Abstract:
  10.  
  11.     CRC32 functions
  12.  
  13.  
  14.  
  15. Revision History
  16.  
  17. --*/
  18.  
  19. #include "lib.h"
  20.  
  21.  
  22. UINT32 CRCTable[256] = {
  23.     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
  24.     0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  25.     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
  26.     0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  27.     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
  28.     0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  29.     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
  30.     0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  31.     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
  32.     0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  33.     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
  34.     0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  35.     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
  36.     0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  37.     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
  38.     0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  39.     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
  40.     0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  41.     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
  42.     0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  43.     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
  44.     0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  45.     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
  46.     0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  47.     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
  48.     0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  49.     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
  50.     0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  51.     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
  52.     0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  53.     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
  54.     0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  55.     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
  56.     0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  57.     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
  58.     0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  59.     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
  60.     0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  61.     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
  62.     0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  63.     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
  64.     0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  65.     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
  66.     };
  67.    
  68.  
  69.  
  70. VOID
  71. SetCrc (
  72.     IN OUT EFI_TABLE_HEADER *Hdr
  73.     )
  74. /*++
  75.  
  76. Routine Description:
  77.  
  78.     Updates the CRC32 value in the table header
  79.  
  80. Arguments:
  81.  
  82.     Hdr     - The table to update
  83.  
  84. Returns:
  85.  
  86.     None
  87.  
  88. --*/
  89. {
  90.     SetCrcAltSize (Hdr->HeaderSize, Hdr);
  91. }
  92.  
  93. VOID
  94. SetCrcAltSize (
  95.     IN UINTN                 Size,
  96.     IN OUT EFI_TABLE_HEADER *Hdr
  97.     )
  98. /*++
  99.  
  100. Routine Description:
  101.  
  102.     Updates the CRC32 value in the table header
  103.  
  104. Arguments:
  105.  
  106.     Hdr     - The table to update
  107.  
  108. Returns:
  109.  
  110.     None
  111.  
  112. --*/
  113. {
  114.     Hdr->CRC32 = 0;
  115.     Hdr->CRC32 = CalculateCrc((UINT8 *)Hdr, Size);
  116. }
  117.  
  118.  
  119. BOOLEAN
  120. CheckCrc (
  121.     IN UINTN                 MaxSize,
  122.     IN OUT EFI_TABLE_HEADER *Hdr
  123.     )
  124. /*++
  125.  
  126. Routine Description:
  127.  
  128.     Checks the CRC32 value in the table header
  129.  
  130. Arguments:
  131.  
  132.     Hdr     - The table to check
  133.  
  134. Returns:
  135.  
  136.     TRUE if the CRC is OK in the table
  137.  
  138. --*/
  139. {
  140.     return CheckCrcAltSize (MaxSize, Hdr->HeaderSize, Hdr);
  141. }
  142.  
  143.  
  144.  
  145.  
  146. BOOLEAN
  147. CheckCrcAltSize (
  148.     IN UINTN                 MaxSize,
  149.     IN UINTN                 Size,
  150.     IN OUT EFI_TABLE_HEADER *Hdr
  151.     )
  152. /*++
  153.  
  154. Routine Description:
  155.  
  156.     Checks the CRC32 value in the table header
  157.  
  158. Arguments:
  159.  
  160.     Hdr     - The table to check
  161.  
  162. Returns:
  163.  
  164.     TRUE if the CRC is OK in the table
  165.  
  166. --*/
  167. {
  168.     UINT32      Crc;
  169.     UINT32      OrgCrc;
  170.     BOOLEAN     f;
  171.  
  172.     if (Size == 0) {
  173.         //
  174.         // If header size is 0 CRC will pass so return FALSE here
  175.         //
  176.         return FALSE;
  177.     }
  178.     if (MaxSize && Size > MaxSize) {
  179.         DEBUG((D_ERROR, "CheckCrc32: Size > MaxSize\n"));
  180.         return FALSE;
  181.     }
  182.  
  183.     // clear old crc from header
  184.     OrgCrc = Hdr->CRC32;
  185.     Hdr->CRC32 = 0;
  186.     Crc = CalculateCrc((UINT8 *)Hdr, Size);
  187.  
  188.     // set restults
  189.     Hdr->CRC32 = OrgCrc;
  190.  
  191.     // return status
  192.     f = OrgCrc == (UINT32) Crc;
  193.     if (!f) {
  194.         DEBUG((D_ERROR, "CheckCrc32: Crc check failed\n"));
  195.     }
  196.  
  197.     return f;
  198. }
  199.  
  200.  
  201. UINT32
  202. CalculateCrc (
  203.     UINT8 *pt,
  204.     UINTN Size
  205.     )
  206. {
  207.     UINTN Crc;
  208.  
  209.     // compute crc
  210.     Crc = 0xffffffff;
  211.     while (Size) {
  212.         Crc = (Crc >> 8) ^ CRCTable[(UINT8) Crc ^ *pt];
  213.         pt += 1;
  214.         Size -= 1;
  215.     }
  216.     Crc = Crc ^ 0xffffffff;
  217.     return (UINT32)Crc;
  218. }
  219.