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lob.go
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lob.go
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package go_ora
import (
"bytes"
"errors"
"github.com/sijms/go-ora/network"
)
type Lob struct {
sourceLocator []byte
destLocator []byte
scn []byte
sourceOffset int
destOffset int
charsetID int
size int64
data bytes.Buffer
}
func (lob *Lob) variableWidthChar() bool {
if len(lob.sourceLocator) > 6 && lob.sourceLocator[6]&128 == 128 {
return true
}
return false
}
func (lob *Lob) littleEndianClob() bool {
if len(lob.sourceLocator) > 7 && lob.sourceLocator[7]&64 > 0 {
return true
}
return false
}
func (lob *Lob) getSize(conn *Connection) (size int64, err error) {
session := conn.session
tracer := conn.connOption.Tracer
tracer.Print("Read Lob Size")
err = lob.write(session, 1)
if err != nil {
return
}
err = lob.read(session)
if err != nil {
return
}
size = lob.size
tracer.Print("Lob Size: ", size)
return
}
func (lob *Lob) getData(conn *Connection) (data []byte, err error) {
session := conn.session
tracer := conn.connOption.Tracer
tracer.Print("Read Lob Data")
lob.sourceOffset = 1
err = lob.write(session, 2)
if err != nil {
return
}
err = lob.read(session)
if err != nil {
return
}
data = lob.data.Bytes()
return
}
func (lob *Lob) write(session *network.Session, operationID int) error {
session.ResetBuffer()
session.PutBytes(3, 0x60, 0)
if len(lob.sourceLocator) == 0 {
session.PutBytes(0)
} else {
session.PutBytes(1)
}
session.PutUint(len(lob.sourceLocator), 4, true, true)
if len(lob.destLocator) == 0 {
session.PutBytes(0)
} else {
session.PutBytes(1)
}
session.PutUint(len(lob.destLocator), 4, true, true)
// put offsets
if session.TTCVersion < 3 {
session.PutUint(lob.sourceOffset, 4, true, true)
session.PutUint(lob.destOffset, 4, true, true)
} else {
session.PutBytes(0, 0)
}
if lob.charsetID != 0 {
session.PutBytes(1)
} else {
session.PutBytes(0)
}
if session.TTCVersion < 3 {
session.PutBytes(1)
} else {
session.PutBytes(0)
}
// if bNullO2U (false) {
// session.PutBytes(1)
//} else {
session.PutBytes(0)
session.PutInt(operationID, 4, true, true)
if len(lob.scn) == 0 {
session.PutBytes(0)
} else {
session.PutBytes(1)
}
session.PutUint(len(lob.scn), 4, true, true)
if session.TTCVersion >= 3 {
session.PutUint(lob.sourceOffset, 8, true, true)
session.PutInt(lob.destOffset, 8, true, true)
// sendAmount
session.PutBytes(1)
}
if session.TTCVersion >= 4 {
session.PutBytes(0, 0, 0, 0, 0, 0)
}
if len(lob.sourceLocator) > 0 {
session.PutBytes(lob.sourceLocator...)
}
if len(lob.destLocator) > 0 {
session.PutBytes(lob.destLocator...)
}
if lob.charsetID != 0 {
session.PutUint(lob.charsetID, 2, true, true)
}
if session.TTCVersion < 3 {
session.PutUint(lob.size, 4, true, true)
}
for x := 0; x < len(lob.scn); x++ {
session.PutUint(lob.scn[x], 4, true, true)
}
if session.TTCVersion >= 3 {
session.PutUint(lob.size, 8, true, true)
}
return session.Write()
}
func (lob *Lob) read(session *network.Session) error {
loop := true
for loop {
msg, err := session.GetByte()
if err != nil {
return err
}
switch msg {
case 4:
session.Summary, err = network.NewSummary(session)
if err != nil {
return err
}
if session.HasError() {
if session.Summary.RetCode == 1403 {
session.Summary = nil
} else {
return session.GetError()
}
}
loop = false
case 8:
// read rpa message
if len(lob.sourceLocator) != 0 {
_, err = session.GetBytes(len(lob.sourceLocator))
if err != nil {
return err
}
}
if len(lob.destLocator) != 0 {
_, err = session.GetBytes(len(lob.destLocator))
if err != nil {
return err
}
}
if lob.charsetID != 0 {
lob.charsetID, err = session.GetInt(2, true, true)
if err != nil {
return err
}
}
// get datasize
if session.TTCVersion < 3 {
lob.size, err = session.GetInt64(4, true, true)
if err != nil {
return err
}
} else {
lob.size, err = session.GetInt64(8, true, true)
if err != nil {
return err
}
}
case 9:
if session.HasEOSCapability {
session.Summary.EndOfCallStatus, err = session.GetInt(4, true, true)
if err != nil {
return err
}
}
loop = false
case 14:
// get the data
err = lob.readData(session)
if err != nil {
return err
}
default:
return errors.New("TTC error")
}
}
return nil
}
func (lob *Lob) readData(session *network.Session) error {
num1 := 0 // data readed in the call of this function
var chunkSize byte = 0
var err error
//num3 := offset // the data readed from the start of read operation
num4 := 0
for num4 != 4 {
switch num4 {
case 0:
chunkSize, err = session.GetByte()
if err != nil {
return err
}
if chunkSize == 0xFE {
num4 = 2
} else {
num4 = 1
}
case 1:
chunk, err := session.GetBytes(int(chunkSize))
if err != nil {
return err
}
lob.data.Write(chunk)
num1 += int(chunkSize)
num4 = 4
case 2:
chunkSize, err = session.GetByte()
if err != nil {
return err
}
if chunkSize <= 0 {
num4 = 4
} else {
num4 = 3
}
case 3:
chunk, err := session.GetBytes(int(chunkSize))
if err != nil {
return err
}
lob.data.Write(chunk)
num1 += int(chunkSize)
//num3 += chunkSize
num4 = 2
}
}
return nil
}