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Overview
Comment:Another fix to the hash signature algorithm in vfslog.c.
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SHA1: 34212aa8c405c4ff3f8045ec0cf2a860af61540f
User & Date: drh 2013-10-10 13:41:04.179
Context
2013-10-10
15:04
Enhancements to the vfslog.c module to show all change-counter changes and to show the hostname and pid of the process that creates each log file. (check-in: af7abebeb1 user: drh tags: trunk)
13:41
Another fix to the hash signature algorithm in vfslog.c. (check-in: 34212aa8c4 user: drh tags: trunk)
13:38
Fix the hash signature algorithm in vfslog.c. Add a utility program to show the hash signatures for every page of a database file. (check-in: eaf4de13a6 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to ext/misc/vfslog.c.
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    pI = (unsigned int*)p;
    for(i=0; i<n-7; i+=8){
      s0 += pI[0] + s1;
      s1 += pI[1] + s0;
      pI += 2;
    }
    for(i=0; i<8; i++) sqlite3_snprintf(3, zCksum+i*2, "%02x", p[i]);
    sqlite3_snprintf(18, zCksum+i*2, "-%08x08x", s0, s1);
  }
}

/*
** Read data from an vlog-file.
*/
static int vlogRead(








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    pI = (unsigned int*)p;
    for(i=0; i<n-7; i+=8){
      s0 += pI[0] + s1;
      s1 += pI[1] + s0;
      pI += 2;
    }
    for(i=0; i<8; i++) sqlite3_snprintf(3, zCksum+i*2, "%02x", p[i]);
    sqlite3_snprintf(18, zCksum+i*2, "-%08x%08x", s0, s1);
  }
}

/*
** Read data from an vlog-file.
*/
static int vlogRead(
︙︙
Changes to tool/pagesig.c.
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    pI = (unsigned int*)p;
    for(i=0; i<n-7; i+=8){
      s0 += pI[0] + s1;
      s1 += pI[1] + s0;
      pI += 2;
    }
    for(i=0; i<8; i++) sprintf(zCksum+i*2, "%02x", p[i]);
    sprintf(zCksum+i*2, "-%08x08x", s0, s1);
  }
}

/*
** Open a file.  Find its page size.  Read each page, and compute and
** display the page signature.
*/








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    pI = (unsigned int*)p;
    for(i=0; i<n-7; i+=8){
      s0 += pI[0] + s1;
      s1 += pI[1] + s0;
      pI += 2;
    }
    for(i=0; i<8; i++) sprintf(zCksum+i*2, "%02x", p[i]);
    sprintf(zCksum+i*2, "-%08x%08x", s0, s1);
  }
}

/*
** Open a file.  Find its page size.  Read each page, and compute and
** display the page signature.
*/
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