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  • Committer: Andrew Hutchings
  • Date: 2011-03-29 20:45:43 UTC
  • mfrom: (2257 drizzle)
  • mto: (2257.1.3 build)
  • mto: This revision was merged to the branch mainline in revision 2258.
  • Revision ID: andrew@linuxjedi.co.uk-20110329204543-ssex0nuo8knncgwx
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plugin/myisam/mi_checksum.cc
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/* Calculate a checksum for a row */
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#include "myisam_priv.h"
 
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#include <zlib.h>
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using namespace drizzled;
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internal::ha_checksum mi_checksum(MI_INFO *info, const unsigned char *buf)
 
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/*
 
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  Calculate a long checksum for a memoryblock.
 
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  SYNOPSIS
 
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    my_checksum()
 
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      crc       start value for crc
 
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      pos       pointer to memory block
 
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      length    length of the block
 
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*/
 
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static ha_checksum my_checksum(ha_checksum crc, const unsigned char *pos, size_t length)
 
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{
 
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  return ha_checksum(crc32((uint32_t)crc, pos, uInt(length)));
 
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}
 
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ha_checksum mi_checksum(MI_INFO *info, const unsigned char *buf)
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{
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  uint32_t i;
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  internal::ha_checksum crc=0;
 
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  ha_checksum crc=0;
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  MI_COLUMNDEF *rec=info->s->rec;
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  for (i=info->s->base.fields ; i-- ; buf+=(rec++)->length)
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      pos=buf;
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      break;
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    }
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    crc=internal::my_checksum(crc, pos ? pos : (unsigned char*) "", length);
 
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    crc=my_checksum(crc, pos ? pos : (unsigned char*) "", length);
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  }
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  return crc;
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}
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internal::ha_checksum mi_static_checksum(MI_INFO *info, const unsigned char *pos)
 
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ha_checksum mi_static_checksum(MI_INFO *info, const unsigned char *pos)
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{
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  return internal::my_checksum(0, pos, info->s->base.reclength);
 
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  return my_checksum(0, pos, info->s->base.reclength);
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}