internal RC ptrmapGet(Pgno key, ref PTRMAP pEType, ref Pgno pPgno) { Debug.Assert(MutexEx.Held(this.Mutex)); var iPtrmap = (int)MemPage.PTRMAP_PAGENO(this, key); var pDbPage = new PgHdr(); // The pointer map page var rc = this.Pager.Get((Pgno)iPtrmap, ref pDbPage); if (rc != RC.OK) { return(rc); } var pPtrmap = Pager.sqlite3PagerGetData(pDbPage);// Pointer map page data var offset = (int)MemPage.PTRMAP_PTROFFSET((Pgno)iPtrmap, key); if (offset < 0) { Pager.Unref(pDbPage); return(SysEx.SQLITE_CORRUPT_BKPT()); } Debug.Assert(offset <= (int)this.UsableSize - 5); var v = pPtrmap[offset]; if (v < 1 || v > 5) { return(SysEx.SQLITE_CORRUPT_BKPT()); } pEType = (PTRMAP)v; pPgno = ConvertEx.Get4(pPtrmap, offset + 1); Pager.Unref(pDbPage); return(RC.OK); }
internal void ptrmapPut(Pgno key, PTRMAP eType, Pgno parent, ref RC rRC) { if (rRC != RC.OK) { return; } Debug.Assert(MutexEx.Held(this.Mutex)); // The master-journal page number must never be used as a pointer map page Debug.Assert(!MemPage.PTRMAP_ISPAGE(this, MemPage.PENDING_BYTE_PAGE(this))); Debug.Assert(this.AutoVacuum); if (key == 0) { rRC = SysEx.SQLITE_CORRUPT_BKPT(); return; } var iPtrmap = MemPage.PTRMAP_PAGENO(this, key); var pDbPage = new PgHdr(); // The pointer map page var rc = this.Pager.Get(iPtrmap, ref pDbPage); if (rc != RC.OK) { rRC = rc; return; } var offset = (int)MemPage.PTRMAP_PTROFFSET(iPtrmap, key); if (offset < 0) { rRC = SysEx.SQLITE_CORRUPT_BKPT(); goto ptrmap_exit; } Debug.Assert(offset <= (int)this.UsableSize - 5); var pPtrmap = Pager.sqlite3PagerGetData(pDbPage); // The pointer map data if (eType != (PTRMAP)pPtrmap[offset] || ConvertEx.Get4(pPtrmap, offset + 1) != parent) { Btree.TRACE("PTRMAP_UPDATE: {0}->({1},{2})", key, eType, parent); rRC = rc = Pager.Write(pDbPage); if (rc == RC.OK) { pPtrmap[offset] = (byte)eType; ConvertEx.Put4L(pPtrmap, (uint)offset + 1, parent); } } ptrmap_exit: Pager.Unref(pDbPage); }