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Overview
Comment:In kvtest.c, use stat() instead of fseek()/ftell() to determine the size of a BLOB to be read directly from disk. This makes the pile-of-files database more competative against SQLite.
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SHA1: a7dca29f03e037fe71cc600db97f8058e3bd28a4
User & Date: drh 2016-12-29 17:25:06
Context
2016-12-29
19:48
Fix harmless compiler warnings in the command-line shell and in Lemon. check-in: afcdc4a6 user: drh tags: trunk
17:25
In kvtest.c, use stat() instead of fseek()/ftell() to determine the size of a BLOB to be read directly from disk. This makes the pile-of-files database more competative against SQLite. check-in: a7dca29f user: drh tags: trunk
16:58
Add the kvtest.c test program used to show that it is many times faster to read thumbnail and similar BLOBs out of an SQLite database than it is to read them as separate files from the filesystem. check-in: 8074d59c user: drh tags: trunk
Changes
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Changes to test/kvtest.c.

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#ifndef _WIN32
# include <unistd.h>
#else
  /* Provide Windows equivalent for the needed parts of unistd.h */
# include <io.h>
# define R_OK 2

# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
# define access _access
#endif


/*
** Show thqe help text and quit.
................................................................................
  memset(&x, 0, sizeof(x));
  rc = stat(zPath, &x);
  if( rc<0 ) return PATH_OTHER;
  if( S_ISDIR(x.st_mode) ) return PATH_DIR;
  if( (x.st_size%512)==0 ) return PATH_DB;
  return PATH_OTHER;
}















/*
** A Pseudo-random number generator with a fixed seed.  Use this so
** that the same sequence of "random" numbers are generated on each
** run, for repeatability.
*/
static unsigned int randInt(void){
................................................................................
** from the file before the buffer is returned. This byte is not included in
** the final value of (*pnByte), if applicable.
**
** NULL is returned if any error is encountered. The final value of *pnByte
** is undefined in this case.
*/
static unsigned char *readFile(const char *zName, int *pnByte){
  FILE *in = fopen(zName, "rb");
  long nIn;
  size_t nRead;
  unsigned char *pBuf;
  if( in==0 ) return 0;
  fseek(in, 0, SEEK_END);
  nIn = ftell(in);
  rewind(in);
  pBuf = sqlite3_malloc64( nIn+1 );

  if( pBuf==0 ) return 0;
  nRead = fread(pBuf, nIn, 1, in);
  fclose(in);
  if( nRead!=1 ){
    sqlite3_free(pBuf);
    return 0;
  }
  pBuf[nIn] = 0;
  if( pnByte ) *pnByte = nIn;
  return pBuf;
}

/*
** Return the current time in milliseconds since the beginning of
** the Julian epoch.







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#ifndef _WIN32
# include <unistd.h>
#else
  /* Provide Windows equivalent for the needed parts of unistd.h */
# include <io.h>
# define R_OK 2
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
# define access _access
#endif


/*
** Show thqe help text and quit.
................................................................................
  memset(&x, 0, sizeof(x));
  rc = stat(zPath, &x);
  if( rc<0 ) return PATH_OTHER;
  if( S_ISDIR(x.st_mode) ) return PATH_DIR;
  if( (x.st_size%512)==0 ) return PATH_DB;
  return PATH_OTHER;
}

/*
** Return the size of a file in bytes.  Or return -1 if the
** named object is not a regular file or does not exist.
*/
static sqlite3_int64 fileSize(const char *zPath){
  struct stat x;
  int rc;
  memset(&x, 0, sizeof(x));
  rc = stat(zPath, &x);
  if( rc<0 ) return -1;
  if( !S_ISREG(x.st_mode) ) return -1;
  return x.st_size;
}

/*
** A Pseudo-random number generator with a fixed seed.  Use this so
** that the same sequence of "random" numbers are generated on each
** run, for repeatability.
*/
static unsigned int randInt(void){
................................................................................
** from the file before the buffer is returned. This byte is not included in
** the final value of (*pnByte), if applicable.
**
** NULL is returned if any error is encountered. The final value of *pnByte
** is undefined in this case.
*/
static unsigned char *readFile(const char *zName, int *pnByte){
  FILE *in;               /* FILE from which to read content of zName */
  sqlite3_int64 nIn;      /* Size of zName in bytes */
  size_t nRead;           /* Number of bytes actually read */
  unsigned char *pBuf;    /* Content read from disk */

  nIn = fileSize(zName);
  if( nIn<0 ) return 0;
  in = fopen(zName, "rb");
  if( in==0 ) return 0;
  pBuf = sqlite3_malloc64( nIn );
  if( pBuf==0 ) return 0;
  nRead = fread(pBuf, nIn, 1, in);
  fclose(in);
  if( nRead!=1 ){
    sqlite3_free(pBuf);
    return 0;
  }

  if( pnByte ) *pnByte = nIn;
  return pBuf;
}

/*
** Return the current time in milliseconds since the beginning of
** the Julian epoch.