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-/*
-** 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.
-**
-** @(#) $Id$
-*/
-
-#ifndef _PAGER_H_
-#define _PAGER_H_
-
-/*
-** The default size of a database page.
-*/
-#ifndef SQLITE_DEFAULT_PAGE_SIZE
-# define SQLITE_DEFAULT_PAGE_SIZE 1024
-#endif
-
-/* Maximum page size. The upper bound on this value is 32768. This a limit
-** imposed by necessity of storing the value in a 2-byte unsigned integer
-** and the fact that the page size must be a power of 2.
-**
-** This value is used to initialize certain arrays on the stack at
-** various places in the code. On embedded machines where stack space
-** is limited and the flexibility of having large pages is not needed,
-** it makes good sense to reduce the maximum page size to something more
-** reasonable, like 1024.
-*/
-#ifndef SQLITE_MAX_PAGE_SIZE
-# define SQLITE_MAX_PAGE_SIZE 32768
-#endif
-
-/*
-** Maximum number of pages in one database.
-*/
-#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;
-
-/*
-** Allowed values for the flags parameter to sqlite3pager_open().
-**
-** NOTE: This values must match the corresponding BTREE_ values in btree.h.
-*/
-#define PAGER_OMIT_JOURNAL 0x0001 /* Do not use a rollback journal */
-#define PAGER_NO_READLOCK 0x0002 /* Omit readlocks on readonly files */
-
-
-/*
-** See source code comments for a detailed description of the following
-** routines:
-*/
-int sqlite3pager_open(Pager **ppPager, const char *zFilename,
- int nExtra, int flags);
-void sqlite3pager_set_busyhandler(Pager*, BusyHandler *pBusyHandler);
-void sqlite3pager_set_destructor(Pager*, void(*)(void*,int));
-void sqlite3pager_set_reiniter(Pager*, void(*)(void*,int));
-int sqlite3pager_set_pagesize(Pager*, int);
-void sqlite3pager_read_fileheader(Pager*, int, unsigned char*);
-void sqlite3pager_set_cachesize(Pager*, int);
-int sqlite3pager_close(Pager *pPager);
-int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage);
-void *sqlite3pager_lookup(Pager *pPager, Pgno pgno);
-int sqlite3pager_ref(void*);
-int sqlite3pager_unref(void*);
-Pgno sqlite3pager_pagenumber(void*);
-int sqlite3pager_write(void*);
-int sqlite3pager_iswriteable(void*);
-int sqlite3pager_overwrite(Pager *pPager, Pgno pgno, void*);
-int sqlite3pager_pagecount(Pager*);
-int sqlite3pager_truncate(Pager*,Pgno);
-int sqlite3pager_begin(void*, int exFlag);
-int sqlite3pager_commit(Pager*);
-int sqlite3pager_sync(Pager*,const char *zMaster, Pgno);
-int sqlite3pager_rollback(Pager*);
-int sqlite3pager_isreadonly(Pager*);
-int sqlite3pager_stmt_begin(Pager*);
-int sqlite3pager_stmt_commit(Pager*);
-int sqlite3pager_stmt_rollback(Pager*);
-void sqlite3pager_dont_rollback(void*);
-void sqlite3pager_dont_write(Pager*, Pgno);
-int sqlite3pager_refcount(Pager*);
-int *sqlite3pager_stats(Pager*);
-void sqlite3pager_set_safety_level(Pager*,int,int);
-const char *sqlite3pager_filename(Pager*);
-const char *sqlite3pager_dirname(Pager*);
-const char *sqlite3pager_journalname(Pager*);
-int sqlite3pager_nosync(Pager*);
-int sqlite3pager_rename(Pager*, const char *zNewName);
-void sqlite3pager_set_codec(Pager*,void*(*)(void*,void*,Pgno,int),void*);
-int sqlite3pager_movepage(Pager*,void*,Pgno);
-int sqlite3pager_reset(Pager*);
-int sqlite3pager_release_memory(int);
-
-#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
-int sqlite3pager_lockstate(Pager*);
-#endif
-
-#ifdef SQLITE_TEST
-void sqlite3pager_refdump(Pager*);
-int pager3_refinfo_enable;
-#endif
-
-#endif /* _PAGER_H_ */