// ReadAt reads into p, starting from off.
func (lrw *lobReadWriter) ReadAt(p []byte, off int64) (n int, err error) {
byte_amtp := C.oraub8(len(p))
//Log.Infof("LobRead2 off=%d amt=%d", off, len(p))
r := C.OCILobRead2(
lrw.ses.ocisvcctx, //OCISvcCtx *svchp,
lrw.ses.srv.env.ocierr, //OCIError *errhp,
lrw.ociLobLocator, //OCILobLocator *locp,
&byte_amtp, //oraub8 *byte_amtp,
nil, //oraub8 *char_amtp,
C.oraub8(off)+1, //oraub8 offset, offset is 1-based
unsafe.Pointer(&p[0]), //void *bufp,
C.oraub8(len(p)), //oraub8 bufl,
C.OCI_ONE_PIECE, //ub1 piece,
nil, //void *ctxp,
nil, //OCICallbackLobRead2 (cbfp)
C.ub2(0), //ub2 csid,
lrw.charsetForm, //ub1 csfrm );
)
//Log.Infof("LobRead2 returned %d amt=%d", r, byte_amtp)
switch r {
case C.OCI_ERROR:
return 0, lrw.ses.srv.env.ociError()
case C.OCI_NO_DATA:
return int(byte_amtp), io.EOF
case C.OCI_INVALID_HANDLE:
return 0, fmt.Errorf("Invalid handle %v", lrw.ociLobLocator)
}
return int(byte_amtp), nil
}
// WriteTo writes all data from the LOB into the given Writer.
func (lr *lobReader) WriteTo(w io.Writer) (n int64, err error) {
defer func() {
if closeErr := lr.Close(); closeErr != nil && err == nil {
err = closeErr
}
}()
var byte_amtp C.oraub8 // zero
arr := lobChunkPool.Get().([lobChunkSize]byte)
defer lobChunkPool.Put(arr)
buf := arr[:]
var k int
for {
//Log.Infof("WriteTo LobRead2 off=%d amt=%d", lr.off, len(buf))
r := C.OCILobRead2(
lr.ses.ocisvcctx, //OCISvcCtx *svchp,
lr.ses.srv.env.ocierr, //OCIError *errhp,
lr.ociLobLocator, //OCILobLocator *locp,
&byte_amtp, //oraub8 *byte_amtp,
nil, //oraub8 *char_amtp,
lr.off+1, //oraub8 offset, offset is 1-based
unsafe.Pointer(&buf[0]), //void *bufp,
C.oraub8(len(buf)), //oraub8 bufl,
lr.piece, //ub1 piece,
nil, //void *ctxp,
nil, //OCICallbackLobRead2 (cbfp)
C.ub2(0), //ub2 csid,
lr.charsetForm, //ub1 csfrm );
)
//Log.Infof("WriteTo LobRead2 returned %d amt=%d piece=%d", r, byte_amtp, lr.piece)
switch r {
case C.OCI_SUCCESS:
case C.OCI_NO_DATA:
break
default:
return 0, lr.ses.srv.env.ociError()
}
// byte_amtp represents the amount copied into buffer by oci
lr.off += byte_amtp
if byte_amtp != 0 {
if k, err = w.Write(buf[:int(byte_amtp)]); err != nil {
return n, err
}
n += int64(k)
if lr.off == lr.Length {
break
}
}
if lr.piece == C.OCI_FIRST_PIECE {
lr.piece = C.OCI_NEXT_PIECE
}
}
return n, nil
}
// Read into p, the next chunk.
func (lr *lobReader) Read(p []byte) (n int, err error) {
if lr.ociLobLocator == nil {
return 0, io.EOF
}
defer func() {
if err != nil {
lr.Close()
}
}()
var byte_amtp C.oraub8 // zero
//Log.Infof("LobRead2 piece=%d off=%d amt=%d", lr.piece, lr.off, len(p))
r := C.OCILobRead2(
lr.ses.ocisvcctx, //OCISvcCtx *svchp,
lr.ses.srv.env.ocierr, //OCIError *errhp,
lr.ociLobLocator, //OCILobLocator *locp,
&byte_amtp, //oraub8 *byte_amtp,
nil, //oraub8 *char_amtp,
lr.off+1, //oraub8 offset, offset is 1-based
unsafe.Pointer(&p[0]), //void *bufp,
C.oraub8(len(p)), //oraub8 bufl,
lr.piece, //ub1 piece,
nil, //void *ctxp,
nil, //OCICallbackLobRead2 (cbfp)
C.ub2(0), //ub2 csid,
lr.charsetForm, //ub1 csfrm );
)
//Log.Infof("LobRead2 returned %d amt=%d", r, byte_amtp)
switch r {
case C.OCI_ERROR:
lr.interrupted = true
return 0, lr.ses.srv.env.ociError()
case C.OCI_NO_DATA:
return int(byte_amtp), io.EOF
case C.OCI_INVALID_HANDLE:
return 0, fmt.Errorf("Invalid handle %v", lr.ociLobLocator)
}
// byte_amtp represents the amount copied into buffer by oci
if byte_amtp != 0 {
lr.off += byte_amtp
if lr.off == lr.Length {
return int(byte_amtp), io.EOF
}
if lr.piece == C.OCI_FIRST_PIECE {
lr.piece = C.OCI_NEXT_PIECE
}
}
return int(byte_amtp), nil
}
func (def *defLob) Bytes() (value []byte, err error) {
// Open the lob to obtain length; round-trip to database
//Log.Infof("Bytes OCILobOpen %p", def.ociLobLocator)
lobLength, err := lobOpen(def.rset.stmt.ses, def.ociLobLocator, C.OCI_LOB_READONLY)
if err != nil {
def.ociLobLocator = nil
return nil, err
}
defer func() {
//Log.Infof("Bytes OCILobClose %p", def.ociLobLocator)
if closeErr := lobClose(def.rset.stmt.ses, def.ociLobLocator); closeErr != nil && err == nil {
err = closeErr
}
}()
if lobLength == 0 {
return nil, nil
}
// Allocate []byte the length of the lob
value = make([]byte, int(lobLength))
for off, byte_amtp := 0, lobLength; byte_amtp > 0; byte_amtp = lobLength - C.oraub8(off) {
//Log.Infof("LobRead2 off=%d amt=%d", off, byte_amtp)
r := C.OCILobRead2(
def.rset.stmt.ses.ocisvcctx, //OCISvcCtx *svchp,
def.rset.stmt.ses.srv.env.ocierr, //OCIError *errhp,
def.ociLobLocator, //OCILobLocator *locp,
&byte_amtp, //oraub8 *byte_amtp,
nil, //oraub8 *char_amtp,
C.oraub8(off+1), //oraub8 offset, offset is 1-based
unsafe.Pointer(&value[off]), //void *bufp,
C.oraub8(lobChunkSize), //oraub8 bufl,
C.OCI_ONE_PIECE, //ub1 piece,
nil, //void *ctxp,
nil, //OCICallbackLobRead2 (cbfp)
C.ub2(0), //ub2 csid,
def.charsetForm) //ub1 csfrm );
if r == C.OCI_ERROR {
return nil, def.rset.stmt.ses.srv.env.ociError()
}
// byte_amtp represents the amount copied into buffer by oci
off += int(byte_amtp)
}
return value, nil
}
// internalRead returns the size of the LOB variable for internal comsumption.
func (lv *ExternalLobVar) internalRead(p []byte, off int64) (length int64, err error) {
var charsetID C.ub2
if lv.isFile {
// Py_BEGIN_ALLOW_THREADS
if CTrace {
ctrace("OCILobFileOpen(conn=%p, lob=%x, OCI_FILE_READONLY)",
lv.lobVar.connection.handle, lv.getHandleBytes())
}
if err = lv.lobVar.environment.CheckStatus(
C.OCILobFileOpen(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
lv.getHandle(), C.OCI_FILE_READONLY),
"LobFileOpen"); err != nil {
return
}
}
// Py_END_ALLOW_THREADS
// Py_BEGIN_ALLOW_THREADS
if lv.lobVar.typ == NClobVarType {
// charsetID = C.OCI_UTF16ID
charsetID = CsIDAl32UTF8
} else {
charsetID = 0
}
var (
byteLen2 = C.oraub8(len(p))
charLen2 = C.oraub8(0)
byteLen = C.ub4(len(p))
status C.sword
pos = int(0)
)
for {
if useLobRead2 {
if CTrace {
ctrace("OCILobRead2(conn=%p, lob=%x, byteLen=%d, charLen=%d, off=%d, &p=%p "+
"len(p)=%d, piece=%d, csID=%d, csF=%d",
lv.lobVar.connection.handle,
lv.getHandleBytes(), byteLen2, charLen2, off+1,
&p[pos], len(p)-pos, C.OCI_ONE_PIECE,
charsetID, lv.lobVar.typ.charsetForm)
}
status = C.OCILobRead2(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
lv.getHandle(), &byteLen2, &charLen2, C.oraub8(off+1),
unsafe.Pointer(&p[pos]), C.oraub8(len(p)-pos), C.OCI_ONE_PIECE,
nil, nil, charsetID, lv.lobVar.typ.charsetForm)
} else {
if CTrace {
//log.Printf("p=%q len(p)=%d pos=%d byteLen=%d", p, len(p), pos, byteLen)
ctrace("OCILobRead(conn=%p, lob=%x, byteLen=%d, off=%d, &p=%p "+
"len(p)=%d, csID=%d, csF=%d",
lv.lobVar.connection.handle,
lv.getHandleBytes(), byteLen, off+1,
&p[pos], len(p)-pos,
charsetID, lv.lobVar.typ.charsetForm)
}
status = C.OCILobRead(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
lv.getHandle(), &byteLen, C.ub4(off+1),
unsafe.Pointer(&p[pos]), C.ub4(len(p)-pos),
nil, nil,
charsetID, lv.lobVar.typ.charsetForm)
}
if !(status == C.OCI_SUCCESS || status == C.OCI_NEED_DATA) {
err = lv.lobVar.environment.CheckStatus(status, "LobRead")
if CTrace {
ctrace("OCILobFileClose(conn=%p, lob=%p)",
lv.lobVar.connection.handle, lv.getHandleBytes())
}
C.OCILobFileClose(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
lv.getHandle())
return
}
if useLobRead2 {
byteLen = C.ub4(byteLen2)
}
off += int64(byteLen)
length += int64(byteLen)
if CTrace {
if useLobRead2 {
ctrace("(byteLen2=%d charLen2=%d) => length=%d off=%d",
byteLen2, charLen2, length, off)
} else {
ctrace("byteLen=%d => length=%d off=%d", byteLen, length, off)
}
}
if status == C.OCI_SUCCESS {
break
}
pos += int(byteLen)
if useLobRead2 {
byteLen2 = C.oraub8(len(p) - pos)
} else {
byteLen = C.ub4(len(p) - pos)
}
}
if lv.isFile {
// Py_BEGIN_ALLOW_THREADS
if CTrace {
ctrace("OCILobFileClose(conn=%p, lob=%x)",
lv.lobVar.connection.handle, lv.getHandleBytes())
}
if err = lv.lobVar.environment.CheckStatus(
C.OCILobFileClose(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
lv.getHandle()),
"LobFileClose"); err != nil {
return
}
}
if 0 == length && err == nil {
err = io.EOF
}
if CTrace {
ctrace("internalRead returns %d, %s", length, err)
}
return
}