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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.
+**
+** @(#) $Id$
+*/
+
+/*
+** 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 65536 (a limit
+** imposed by the 2-byte size of cell array pointers.) The
+** maximum page size determines the amount of stack space allocated
+** by many of the routines in pager.c and btree.c On embedded architectures
+** or any machine where memory and especially stack memory is limited,
+** one may wish to chose a smaller value for the maximum page size.
+*/
+#ifndef SQLITE_MAX_PAGE_SIZE
+# define SQLITE_MAX_PAGE_SIZE 8192
+#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;
+
+
+/*
+** See source code comments for a detailed description of the following
+** routines:
+*/
+int sqlite3pager_open(Pager **ppPager, const char *zFilename,
+ int nExtra, int useJournal);
+void sqlite3pager_set_busyhandler(Pager*, BusyHandler *pBusyHandler);
+void sqlite3pager_set_destructor(Pager*, void(*)(void*,int));
+void sqlite3pager_set_reiniter(Pager*, void(*)(void*,int));
+void 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);
+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_stats(Pager*);
+void sqlite3pager_set_safety_level(Pager*,int);
+const char *sqlite3pager_filename(Pager*);
+const char *sqlite3pager_dirname(Pager*);
+const char *sqlite3pager_journalname(Pager*);
+int sqlite3pager_rename(Pager*, const char *zNewName);
+void sqlite3pager_set_codec(Pager*,void(*)(void*,void*,Pgno,int),void*);
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+int sqlite3pager_lockstate(Pager*);
+#endif
+
+#ifdef SQLITE_TEST
+void sqlite3pager_refdump(Pager*);
+int pager3_refinfo_enable;
+#endif