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Text File  |  1992-07-07  |  4KB  |  120 lines
  1.  
  2. #include "stdlib.h"
  3. #include "fcntl.h"
  4. #include "memory.h"
  5. #include "stdio.h"
  6. #include "io.h"
  7. #include "func.h"
  8. #include "dos.h"
  9. #include "share.h"
  10.  
  11.  
  12. #define SIZE 16384U
  13. unsigned char buff1[SIZE];
  14. unsigned char buff2[SIZE];
  15.  
  16. unsigned long crc_tab[] = {
  17. 0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,
  18. 0xE963A535,0x9E6495A3,0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,
  19. 0x09B64C2B,0x7EB17CBD,0xE7B82D07,0x90BF1D91,0x1DB71064,0x6AB020F2,
  20. 0xF3B97148,0x84BE41DE,0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,
  21. 0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,
  22. 0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4,0xA2677172,
  23. 0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,0x35B5A8FA,0x42B2986C,
  24. 0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,
  25. 0x26D930AC,0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,
  26. 0xCFBA9599,0xB8BDA50F,0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,
  27. 0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,0x76DC4190,0x01DB7106,
  28. 0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,0x9FBFE4A5,0xE8B8D433,
  29. 0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x086D3D2D,
  30. 0x91646C97,0xE6635C01,0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,
  31. 0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,
  32. 0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,
  33. 0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,
  34. 0xA4D1C46D,0xD3D6F4FB,0x4369E96A,0x346ED9FC,0xAD678846,0xDA60B8D0,
  35. 0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9,0x5005713C,0x270241AA,
  36. 0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
  37. 0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81,
  38. 0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,
  39. 0xEAD54739,0x9DD277AF,0x04DB2615,0x73DC1683,0xE3630B12,0x94643B84,
  40. 0x0D6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,
  41. 0xF00F9344,0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,
  42. 0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0,0x10DA7A5A,0x67DD4ACC,
  43. 0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,0xD6D6A3E8,0xA1D1937E,
  44. 0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B,
  45. 0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,
  46. 0x316E8EEF,0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,
  47. 0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,0xC5BA3BBE,0xB2BD0B28,
  48. 0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,
  49. 0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A,0x9C0906A9,0xEB0E363F,
  50. 0x72076785,0x05005713,0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,
  51. 0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242,
  52. 0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,
  53. 0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,
  54. 0x616BFFD3,0x166CCF45,0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,
  55. 0xA7672661,0xD06016F7,0x4969474D,0x3E6E77DB,0xAED16A4A,0xD9D65ADC,
  56. 0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
  57. 0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,0xCDD70693,
  58. 0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94,
  59. 0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D
  60. };
  61.  
  62.  
  63.  
  64. unsigned long crc32(unsigned long crc,unsigned char *s,unsigned n)
  65. {
  66.  
  67. while (n--)
  68.   { crc = (crc>>8) ^ crc_tab[(s[0] ^ crc) & 0xff];
  69.     s++;
  70.   }
  71.  
  72. return crc;
  73. }
  74.  
  75.  
  76.  
  77. unsigned do_file(int fh,unsigned size)
  78. {
  79. unsigned count;
  80. unsigned long crc1,crc2;
  81. unsigned i;
  82.  
  83. _lseek(fh,0L,SEEK_SET);
  84.  
  85. count=_read(fh,buff1,size);
  86.  
  87. crc1=crc2=0xffffffffL;
  88.  
  89. while (count)
  90.   { for (i=0;i<16;i++)
  91.       memcpy(buff2,buff1,count);    // standard memcpy
  92.  
  93.     crc1=crc32(crc1,buff1,count);
  94.     crc2=crc32(crc2,buff2,count);
  95.  
  96.     count=_read(fh,buff1,size);
  97.   }
  98.  
  99. // CRC values should be the same, for all buffer sizes!
  100.  
  101. printf("%5u byte buffer. CRC1 = %8lx  CRC2 = %8lx\n", size,~crc1,~crc2);
  102. }
  103.  
  104.  
  105.  
  106. unsigned main(unsigned argc,char *argv[])
  107. {
  108. int fh;
  109. unsigned i;
  110. unsigned err=0;
  111.  
  112. if ((_dos_open(argv[1],O_RDONLY|SH_DENYNO,&fh)))
  113.   { printf("Can't open %s\n",argv[1]);
  114.     return 1;
  115.   }
  116.  
  117. for (i=64; i<=16384; i<<=1)
  118.   do_file(fh,i);
  119. }
  120.