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Define a set of constants to use as the "index" argument to sqlite3BtreeGetMeta and UpdateMeta. This makes some parts of the code easier to follow. (CVS 6709)

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FossilOrigin-Name: 6dbf4eca00f845baa7200aba421d0bc158ba96aa
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danielk1977
2009-06-03 11:25:07 +00:00
parent 50d654da3b
commit 0d19f7ac57
11 changed files with 107 additions and 112 deletions
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30
src/btree.h
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@@ -13,7 +13,7 @@
** subsystem. See comments in the source code for a detailed description
** of what each interface routine does.
**
** @(#) $Id: btree.h,v 1.115 2009/05/28 11:05:57 danielk1977 Exp $
** @(#) $Id: btree.h,v 1.116 2009/06/03 11:25:07 danielk1977 Exp $
*/
#ifndef _BTREE_H_
#define _BTREE_H_
@@ -58,7 +58,7 @@ struct BtreeMutexArray {
int sqlite3BtreeOpen(
const char *zFilename, /* Name of database file to open */
sqlite3 *db, /* Associated database connection */
Btree **, /* Return open Btree* here */
Btree **ppBtree, /* Return open Btree* here */
int flags, /* Flags */
int vfsFlags /* Flags passed through to VFS open */
);
@@ -80,7 +80,7 @@ int sqlite3BtreeClose(Btree*);
int sqlite3BtreeSetCacheSize(Btree*,int);
int sqlite3BtreeSetSafetyLevel(Btree*,int,int);
int sqlite3BtreeSyncDisabled(Btree*);
int sqlite3BtreeSetPageSize(Btree*,int,int,int);
int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
int sqlite3BtreeGetPageSize(Btree*);
int sqlite3BtreeMaxPageCount(Btree*,int);
int sqlite3BtreeGetReserve(Btree*);
@@ -116,9 +116,31 @@ int sqlite3BtreeIncrVacuum(Btree *);
int sqlite3BtreeDropTable(Btree*, int, int*);
int sqlite3BtreeClearTable(Btree*, int, int*);
void sqlite3BtreeTripAllCursors(Btree*, int);
int sqlite3BtreeGetMeta(Btree*, int idx, u32 *pValue);
int sqlite3BtreeUpdateMeta(Btree*, int idx, u32 value);
void sqlite3BtreeTripAllCursors(Btree*, int);
/*
** The second parameter to sqlite3BtreeGetMeta or sqlite3BtreeUpdateMeta
** should be one of the following values. The integer values are assigned
** to constants so that the offset of the corresponding field in an
** SQLite database header may be found using the following formula:
**
** offset = 36 + (idx * 4)
**
** For example, the free-page-count field is located at byte offset 36 of
** the database file header. The incr-vacuum-flag field is located at
** byte offset 64 (== 36+4*7).
*/
#define BTREE_FREE_PAGE_COUNT 0
#define BTREE_SCHEMA_VERSION 1
#define BTREE_FILE_FORMAT 2
#define BTREE_DEFAULT_CACHE_SIZE 3
#define BTREE_LARGEST_ROOT_PAGE 4
#define BTREE_TEXT_ENCODING 5
#define BTREE_USER_VERSION 6
#define BTREE_INCR_VACUUM 7
int sqlite3BtreeCursor(
Btree*, /* BTree containing table to open */