// 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
j := lv.pos * lv.lobVar.typ.size
if lv.isFile {
// Py_BEGIN_ALLOW_THREADS
if err = lv.lobVar.environment.CheckStatus(
C.OCILobFileOpen(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
(*C.OCILobLocator)(unsafe.Pointer(&lv.lobVar.dataBytes[j])),
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
}
length = int64(len(p))
olength := C.ub4(length + 1)
if err = lv.lobVar.environment.CheckStatus(
C.OCILobRead(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
(*C.OCILobLocator)(unsafe.Pointer(&lv.lobVar.dataBytes[j])),
&olength, C.ub4(off+1), unsafe.Pointer(&p[0]),
C.ub4(len(p)), nil, nil, charsetID, lv.lobVar.typ.charsetForm),
"LobRead"); err != nil {
// Py_END_ALLOW_THREADS
C.OCILobFileClose(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
(*C.OCILobLocator)(unsafe.Pointer(&lv.lobVar.dataBytes[j])))
return
}
if lv.isFile {
// Py_BEGIN_ALLOW_THREADS
if err = lv.lobVar.environment.CheckStatus(
C.OCILobFileClose(lv.lobVar.connection.handle,
lv.lobVar.environment.errorHandle,
(*C.OCILobLocator)(unsafe.Pointer(&lv.lobVar.dataBytes[j]))),
"LobFileClose"); err != nil {
return
}
}
return
}
// 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
}