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Add a new api sqlite3_randomness() for providing access to SQLite's

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internal PRNG.  Add sqlite3_test_control() verbs for controlling the PRNG. (CVS 4882)

FossilOrigin-Name: 15110ea02768bfe977a57eccd6b941a36ebd6b32
This commit is contained in:
drh
2008-03-19 14:15:34 +00:00
parent 345331507f
commit 2fa1868fb6
21 changed files with 127 additions and 82 deletions
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16
src/random.c
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@@ -15,7 +15,7 @@
** Random numbers are used by some of the database backends in order
** to generate random integer keys for tables or random filenames.
**
** $Id: random.c,v 1.21 2008/01/16 17:46:38 drh Exp $
** $Id: random.c,v 1.22 2008/03/19 14:15:35 drh Exp $
*/
#include "sqliteInt.h"
@@ -90,7 +90,7 @@ static int randomByte(void){
/*
** Return N random bytes.
*/
void sqlite3Randomness(int N, void *pBuf){
void sqlite3_randomness(int N, void *pBuf){
unsigned char *zBuf = pBuf;
static sqlite3_mutex *mutex = 0;
if( mutex==0 ){
@@ -103,19 +103,21 @@ void sqlite3Randomness(int N, void *pBuf){
sqlite3_mutex_leave(mutex);
}
#ifdef SQLITE_TEST
#ifndef SQLITE_OMIT_TESTLOGIC
/*
** For testing purposes, we sometimes want to preserve the state of
** PRNG and restore the PRNG to its saved state at a later time.
** The sqlite3_test_control() interface calls these routines to
** control the PRNG.
*/
static struct sqlite3PrngType sqlite3SavedPrng;
void sqlite3SavePrngState(void){
void sqlite3PrngSaveState(void){
memcpy(&sqlite3SavedPrng, &sqlite3Prng, sizeof(sqlite3Prng));
}
void sqlite3RestorePrngState(void){
void sqlite3PrngRestoreState(void){
memcpy(&sqlite3Prng, &sqlite3SavedPrng, sizeof(sqlite3Prng));
}
void sqlite3ResetPrngState(void){
void sqlite3PrngResetState(void){
sqlite3Prng.isInit = 0;
}
#endif /* SQLITE_TEST */
#endif /* SQLITE_OMIT_TESTLOGIC */