diff options
Diffstat (limited to 'src/btreeInt.h')
| -rw-r--r-- | src/btreeInt.h | 57 |
1 files changed, 33 insertions, 24 deletions
diff --git a/src/btreeInt.h b/src/btreeInt.h index ce3c549..d1cdd46 100644 --- a/src/btreeInt.h +++ b/src/btreeInt.h @@ -56,13 +56,13 @@ ** ** OFFSET SIZE DESCRIPTION ** 0 16 Header string: "SQLite format 3\000" -** 16 2 Page size in bytes. +** 16 2 Page size in bytes. (1 means 65536) ** 18 1 File format write version ** 19 1 File format read version ** 20 1 Bytes of unused space at the end of each page -** 21 1 Max embedded payload fraction -** 22 1 Min embedded payload fraction -** 23 1 Min leaf payload fraction +** 21 1 Max embedded payload fraction (must be 64) +** 22 1 Min embedded payload fraction (must be 32) +** 23 1 Min leaf payload fraction (must be 32) ** 24 4 File change counter ** 28 4 Reserved for future use ** 32 4 First freelist page @@ -76,9 +76,10 @@ ** 56 4 1=UTF-8 2=UTF16le 3=UTF16be ** 60 4 User version ** 64 4 Incremental vacuum mode -** 68 4 unused -** 72 4 unused -** 76 4 unused +** 68 4 Application-ID +** 72 20 unused +** 92 4 The version-valid-for number +** 96 4 SQLITE_VERSION_NUMBER ** ** All of the integer values are big-endian (most significant byte first). ** @@ -495,22 +496,15 @@ struct BtCursor { BtShared *pBt; /* The BtShared this cursor points to */ BtCursor *pNext, *pPrev; /* Forms a linked list of all cursors */ struct KeyInfo *pKeyInfo; /* Argument passed to comparison function */ -#ifndef SQLITE_OMIT_INCRBLOB Pgno *aOverflow; /* Cache of overflow page locations */ -#endif - Pgno pgnoRoot; /* The root page of this tree */ - sqlite3_int64 cachedRowid; /* Next rowid cache. 0 means not valid */ CellInfo info; /* A parse of the cell we are pointing at */ - i64 nKey; /* Size of pKey, or last integer key */ - void *pKey; /* Saved key that was cursor's last known position */ + i64 nKey; /* Size of pKey, or last integer key */ + void *pKey; /* Saved key that was cursor last known position */ + Pgno pgnoRoot; /* The root page of this tree */ + int nOvflAlloc; /* Allocated size of aOverflow[] array */ int skipNext; /* Prev() is noop if negative. Next() is noop if positive */ - u8 wrFlag; /* True if writable */ - u8 atLast; /* Cursor pointing to the last entry */ - u8 validNKey; /* True if info.nKey is valid */ + u8 curFlags; /* zero or more BTCF_* flags defined below */ u8 eState; /* One of the CURSOR_XXX constants (see below) */ -#ifndef SQLITE_OMIT_INCRBLOB - u8 isIncrblobHandle; /* True if this cursor is an incr. io handle */ -#endif u8 hints; /* As configured by CursorSetHints() */ i16 iPage; /* Index of current page in apPage */ u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */ @@ -518,16 +512,30 @@ struct BtCursor { }; /* +** Legal values for BtCursor.curFlags +*/ +#define BTCF_WriteFlag 0x01 /* True if a write cursor */ +#define BTCF_ValidNKey 0x02 /* True if info.nKey is valid */ +#define BTCF_ValidOvfl 0x04 /* True if aOverflow is valid */ +#define BTCF_AtLast 0x08 /* Cursor is pointing ot the last entry */ +#define BTCF_Incrblob 0x10 /* True if an incremental I/O handle */ + +/* ** Potential values for BtCursor.eState. ** -** CURSOR_VALID: -** Cursor points to a valid entry. getPayload() etc. may be called. -** ** CURSOR_INVALID: ** Cursor does not point to a valid entry. This can happen (for example) ** because the table is empty or because BtreeCursorFirst() has not been ** called. ** +** CURSOR_VALID: +** Cursor points to a valid entry. getPayload() etc. may be called. +** +** CURSOR_SKIPNEXT: +** Cursor is valid except that the Cursor.skipNext field is non-zero +** indicating that the next sqlite3BtreeNext() or sqlite3BtreePrevious() +** operation should be a no-op. +** ** CURSOR_REQUIRESEEK: ** The table that this cursor was opened on still exists, but has been ** modified since the cursor was last used. The cursor position is saved @@ -544,8 +552,9 @@ struct BtCursor { */ #define CURSOR_INVALID 0 #define CURSOR_VALID 1 -#define CURSOR_REQUIRESEEK 2 -#define CURSOR_FAULT 3 +#define CURSOR_SKIPNEXT 2 +#define CURSOR_REQUIRESEEK 3 +#define CURSOR_FAULT 4 /* ** The database page the PENDING_BYTE occupies. This page is never used. |