491   int iBuf;                       /* Offset within buffer to read from */  in vdbePmaReadBlob()  local
505   iBuf = p->iReadOff % p->nBuffer;  in vdbePmaReadBlob()
506   if( iBuf==0 ){  in vdbePmaReadBlob()
523   nAvail = p->nBuffer - iBuf;   in vdbePmaReadBlob()
529     *ppOut = &p->aBuffer[iBuf];  in vdbePmaReadBlob()
550     memcpy(p->aAlloc, &p->aBuffer[iBuf], nAvail);  in vdbePmaReadBlob()
581   int iBuf;  in vdbePmaReadVarint()  local
586     iBuf = p->iReadOff % p->nBuffer;  in vdbePmaReadVarint()
587     if( iBuf && (p->nBuffer-iBuf)>=9 ){  in vdbePmaReadVarint()
588       p->iReadOff += sqlite3GetVarint(&p->aBuffer[iBuf], pnOut);  in vdbePmaReadVarint()
652     int iBuf = pReadr->iReadOff % pgsz;  in vdbePmaReaderSeek()  local
658     if( rc==SQLITE_OK && iBuf ){  in vdbePmaReaderSeek()
659       int nRead = pgsz - iBuf;  in vdbePmaReaderSeek()
664           pReadr->pFd, &pReadr->aBuffer[iBuf], nRead, pReadr->iReadOff  in vdbePmaReaderSeek()