223   sqlite3_int64 iOfst    /* Start reading here */  in inmemRead()  argument
227   if( iOfst<0 || iOfst>=pVFile->sz ){  in inmemRead()
231   if( iOfst+iAmt>pVFile->sz ){  in inmemRead()
233     iAmt = (int)(pVFile->sz - iOfst);  in inmemRead()
237   memcpy(pData, pVFile->a + iOfst, iAmt);  in inmemRead()
244   sqlite3_int64 iOfst    /* Start writing here */  in inmemWrite()  argument
248   if( iOfst+iAmt > pVFile->sz ){  in inmemWrite()
250     if( iOfst+iAmt >= MX_FILE_SZ ){  in inmemWrite()
253     aNew = realloc(pVFile->a, (int)(iOfst+iAmt));  in inmemWrite()
258     if( iOfst > pVFile->sz ){  in inmemWrite()
259       memset(pVFile->a + pVFile->sz, 0, (int)(iOfst - pVFile->sz));  in inmemWrite()
261     pVFile->sz = (int)(iOfst + iAmt);  in inmemWrite()
263   memcpy(pVFile->a + iOfst, pData, iAmt);  in inmemWrite()