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//
// OciLobLocator.cs
//
// Part of managed C#/.NET library System.Data.OracleClient.dll
//
// Part of the Mono class libraries at
// mcs/class/System.Data.OracleClient/System.Data.OracleClient.Oci
//
// Assembly: System.Data.OracleClient.dll
// Namespace: System.Data.OracleClient.Oci
//
// Author:
// Tim Coleman <tim@timcoleman.com>
//
// Copyright (C) Tim Coleman, 2003
//
using System;
using System.Data.OracleClient;
using System.Runtime.InteropServices;
namespace System.Data.OracleClient.Oci {
internal sealed class OciLobLocator : OciDescriptorHandle, IDisposable
{
#region Fields
bool disposed = false;
OciErrorHandle errorHandle;
OciServiceHandle service;
OciEnvironmentHandle environment;
OciDataType type;
#endregion // Fields
#region Constructors
public OciLobLocator (OciHandle parent, IntPtr handle)
: base (OciHandleType.LobLocator, parent, handle)
{
}
#endregion // Constructors
#region Properties
public OciErrorHandle ErrorHandle {
get { return errorHandle; }
set { errorHandle = value; }
}
public OciServiceHandle Service {
get { return service; }
set { service = value; }
}
public OciDataType LobType {
get { return type; }
set { type = value; }
}
public OciEnvironmentHandle Environment {
get { return environment; }
set { environment = value; }
}
#endregion // Properties
#region Methods
public void BeginBatch (OracleLobOpenMode mode)
{
int status = 0;
status = OciCalls.OCILobOpen (Service,
ErrorHandle,
Handle,
(byte) mode);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
}
public uint Copy (OciLobLocator destination, uint amount, uint destinationOffset, uint sourceOffset)
{
OciCalls.OCILobCopy (Service,
ErrorHandle,
destination,
Handle,
amount,
destinationOffset,
sourceOffset);
return amount;
}
protected override void Dispose (bool disposing)
{
if (!disposed) {
disposed = true;
base.Dispose ();
}
}
public void EndBatch ()
{
int status = 0;
status = OciCalls.OCILobClose (Service, ErrorHandle, this);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
}
public uint Erase (uint offset, uint amount)
{
int status = 0;
uint output = amount;
status = OciCalls.OCILobErase (Service,
ErrorHandle,
this,
ref output,
(uint) offset);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
return output;
}
public int GetChunkSize ()
{
int status = 0;
uint output;
status = OciCalls.OCILobGetChunkSize (Service,
ErrorHandle,
this,
out output);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
return (int) output;
}
public long GetLength (bool binary)
{
int status = 0;
uint output;
status = OciCalls.OCILobGetLength (Service,
ErrorHandle,
this,
out output);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
if (!binary)
output *= 2;
return (long) output;
}
public int Read (byte[] buffer, uint offset, uint count, bool binary)
{
int status = 0;
uint amount = count;
byte csfrm = 0;
// Character types are UTF-16, so amount of characters is 1/2
// the amount of bytes
if (!binary) {
amount /= 2;
status = OciCalls.OCILobCharSetForm (environment,
ErrorHandle,
this,
out csfrm);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
}
status = OciCalls.OCILobRead (Service,
ErrorHandle,
this,
ref amount,
offset,
buffer,
count,
IntPtr.Zero,
IntPtr.Zero,
1000, // OCI_UCS2ID
csfrm);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
return (int) amount;
}
public void Trim (uint newlen)
{
int status = 0;
status = OciCalls.OCILobTrim (Service,
ErrorHandle,
this,
newlen);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
}
public int Write (byte[] buffer, uint offset, uint count, OracleType type)
{
int status = 0;
uint amount = count;
if (type == OracleType.Clob)
amount /= 2;
status = OciCalls.OCILobWrite (Service,
ErrorHandle,
this,
ref amount,
offset,
buffer,
count,
0, // OCI_ONE_PIECE
IntPtr.Zero,
IntPtr.Zero,
1000, // OCI_UCS2ID
0);
if (status != 0) {
OciErrorInfo info = ErrorHandle.HandleError ();
throw new OracleException (info.ErrorCode, info.ErrorMessage);
}
return (int) amount;
}
#endregion // Methods
}
}
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