[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/tool/pagesig.c

-/*
-** 2013-10-01
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** Compute hash signatures for every page of a database file.  This utility
-** program is useful for analyzing the output logs generated by the
-** ext/misc/vfslog.c extension.
-*/
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-#include <stdlib.h>
-
-/*
-** Compute signature for a block of content.
-**
-** For blocks of 16 or fewer bytes, the signature is just a hex dump of
-** the entire block.
-**
-** For blocks of more than 16 bytes, the signature is a hex dump of the
-** first 8 bytes followed by a 64-bit has of the entire block.
-*/
-static void vlogSignature(unsigned char *p, int n, char *zCksum){
-  unsigned int s0 = 0, s1 = 0;
-  unsigned int *pI;
-  int i;
-  if( n<=16 ){
-    for(i=0; i<n; i++) sprintf(zCksum+i*2, "%02x", p[i]);
-  }else{ 
-    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.
-*/
-static void computeSigs(const char *zFilename){
-  FILE *in = fopen(zFilename, "rb");
-  unsigned pgsz;
-  size_t got;
-  unsigned n;
-  unsigned char aBuf[50];
-  unsigned char aPage[65536];
-
-  if( in==0 ){
-    fprintf(stderr, "cannot open \"%s\"\n", zFilename);
-    return;
-  }
-  got = fread(aBuf, 1, sizeof(aBuf), in);
-  if( got!=sizeof(aBuf) ){
-    goto endComputeSigs;
-  }
-  pgsz = aBuf[16]*256 + aBuf[17];
-  if( pgsz==1 ) pgsz = 65536;
-  if( (pgsz & (pgsz-1))!=0 ){
-    fprintf(stderr, "invalid page size: %02x%02x\n", aBuf[16], aBuf[17]);
-    goto endComputeSigs;
-  }
-  rewind(in);
-  for(n=1; (got=fread(aPage, 1, pgsz, in))==pgsz; n++){
-    vlogSignature(aPage, pgsz, aBuf);
-    printf("%4d: %s\n", n, aBuf);
-  }
-
-endComputeSigs:
-  fclose(in);
-}
-
-/*
-** Find page signatures for all named files.
-*/
-int main(int argc, char **argv){
-  int i;
-  for(i=1; i<argc; i++) computeSigs(argv[i]);
-  return 0;
-}