Additional notes:

  The segments used/declared in the PKWARE Data Compression
  Library are:

    DGROUP GROUP _DATA
    ASSUME DS: DGROUP
    _DATA SEGMENT use16 WORD PUBLIC 'DATA'

    PK_TEXT SEGMENT use16 DWORD 'CODE'
    ASSUME CS: PK_TEXT

  When used under Windows or OS/2, the _DATA segment used by the
  library should be declared 'non shareable' in the .DEF file.
  When used with a 32-bit application using a DOS extender, these
  segments must be declared to be 16-bit segments.



CRC-32 routine:

  This routine calculates a running CRC-32 value on the buffer
  passed to it.  You should use proper CRC pre and post-conditioning,
  meaning an initial start value of ~0 (all ones) and the final
  value be one's complemented.  Below is an example pseudo-code
  code using the CRC 32 routine:

  unsigned long far pascal crc32(
  unsigned char far *buffer,
  unsigned short int far *size,
  unsigned long far *old_crc);

  unsigned long crc_cal = ~0;
  unsigned short int size;
  extern char far buffer[];     /* some buffer containing data */
                                /* data to be CRC'd */


  while (data is being put in buffer)
    { size = amount of data in buffer;
      crc_val=crc32(buffer,&size,&crc_val);
    }

  crc_val=~crc_val;

  printf("Final CRC residual value is: %lu\n",crc_val);

-------------------------------
When using Turbo Pascal 5.0 use the

{ $F+ }

meta-command instead of using the 'far' keyword in the example
program.