mirror of
https://github.com/sqlite/sqlite.git
synced 2024-11-28 16:09:31 +01:00
5600adf1b1
Make it part of the standard build for the CLI. Bring some of the vfstrace output up-to-date. FossilOrigin-Name: 055b97de8d2397987d72dbab1cde78ece2d1c066e95042b4ed6b7b36b2cf9006
93 lines
2.3 KiB
C
93 lines
2.3 KiB
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 hash 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;
|
|
}
|