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Artifact 82332878799280145639a48d88cdb4058925e3f6:

** 2001 September 15
** 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.
** This header file defines the interface that the sqlite page cache
** subsystem.  The page cache subsystem reads and writes a file a page
** at a time and provides a journal for rollback.
** @(#) $Id: pager.h,v 1.26 2004/02/11 02:18:07 drh Exp $

** The size of one page
** You can change this value to another (reasonable) value you want.
** It need not be a power of two, though the interface to the disk
** will likely be faster if it is.
** Experiments show that a page size of 1024 gives the best speed
** for common usages.  The speed differences for different sizes
** such as 512, 2048, 4096, an so forth, is minimal.  Note, however,
** that changing the page size results in a completely imcompatible
** file format.
#define SQLITE_PAGE_SIZE 1024

** Number of extra bytes of data allocated at the end of each page and
** stored on disk but not used by the higher level btree layer.  Changing
** this value results in a completely incompatible file format.

** The total number of usable bytes stored on disk for each page.
** The usable bytes come at the beginning of the page and the reserve
** bytes come at the end.

** Maximum number of pages in one database.  (This is a limitation of
** imposed by 4GB files size limits.)
#define SQLITE_MAX_PAGE 1073741823

** The type used to represent a page number.  The first page in a file
** is called page 1.  0 is used to represent "not a page".
typedef unsigned int Pgno;

** Each open file is managed by a separate instance of the "Pager" structure.
typedef struct Pager Pager;

** See source code comments for a detailed description of the following
** routines:
int sqlitepager_open(Pager **ppPager, const char *zFilename,
                     int nPage, int nExtra, int useJournal);
void sqlitepager_set_destructor(Pager*, void(*)(void*));
void sqlitepager_set_cachesize(Pager*, int);
int sqlitepager_close(Pager *pPager);
int sqlitepager_get(Pager *pPager, Pgno pgno, void **ppPage);
void *sqlitepager_lookup(Pager *pPager, Pgno pgno);
int sqlitepager_ref(void*);
int sqlitepager_unref(void*);
Pgno sqlitepager_pagenumber(void*);
int sqlitepager_write(void*);
int sqlitepager_iswriteable(void*);
int sqlitepager_overwrite(Pager *pPager, Pgno pgno, void*);
int sqlitepager_pagecount(Pager*);
int sqlitepager_truncate(Pager*,Pgno);
int sqlitepager_begin(void*);
int sqlitepager_commit(Pager*);
int sqlitepager_rollback(Pager*);
int sqlitepager_isreadonly(Pager*);
int sqlitepager_ckpt_begin(Pager*);
int sqlitepager_ckpt_commit(Pager*);
int sqlitepager_ckpt_rollback(Pager*);
void sqlitepager_dont_rollback(void*);
void sqlitepager_dont_write(Pager*, Pgno);
int *sqlitepager_stats(Pager*);
void sqlitepager_set_safety_level(Pager*,int);
const char *sqlitepager_filename(Pager*);
int sqlitepager_rename(Pager*, const char *zNewName);
void sqlitepager_set_codec(Pager*,void(*)(void*,void*,Pgno,int),void*);

void sqlitepager_refdump(Pager*);
int pager_refinfo_enable;
int journal_format;