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ClearScript/ClearScript/Util/CoTaskMemBlock.cs at master · devloco/ClearScript · GitHub
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CoTaskMemBlock.cs
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CoTaskMemBlock.cs
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using
System
;
using
System
.
Runtime
.
InteropServices
;
namespace
Microsoft
.
ClearScript
.
Util
{
internal
class
CoTaskMemBlock
:
IDisposable
{
public
IntPtr
Addr
{
get
;
private
set
;
}
public
CoTaskMemBlock
(
int
size
)
{
Addr
=
Marshal
.
AllocCoTaskMem
(
size
)
;
}
protected
virtual
void
Dispose
(
bool
disposing
)
{
if
(
Addr
!=
IntPtr
.
Zero
)
{
Marshal
.
FreeCoTaskMem
(
Addr
)
;
Addr
=
IntPtr
.
Zero
;
}
}
public
void
Dispose
(
)
{
Dispose
(
true
)
;
GC
.
SuppressFinalize
(
this
)
;
}
~
CoTaskMemBlock
(
)
{
Dispose
(
false
)
;
}
}
internal
sealed
class
CoTaskMemArrayBlock
:
CoTaskMemBlock
{
private
readonly
int
elementSize
;
private
readonly
int
length
;
public
CoTaskMemArrayBlock
(
int
elementSize
,
int
length
)
:
base
(
elementSize
*
length
)
{
this
.
elementSize
=
elementSize
;
this
.
length
=
length
;
}
public
IntPtr
GetAddr
(
int
index
)
{
if
(
(
index
<
0
)
||
(
index
>=
length
)
)
{
throw
new
ArgumentOutOfRangeException
(
"index"
)
;
}
if
(
Addr
==
IntPtr
.
Zero
)
{
throw
new
ObjectDisposedException
(
ToString
(
)
)
;
}
return
GetAddrInternal
(
index
)
;
}
private
IntPtr
GetAddrInternal
(
int
index
)
{
return
Addr
+
(
index
*
elementSize
)
;
}
}
internal
sealed
class
CoTaskMemVariantBlock
:
CoTaskMemBlock
{
public
CoTaskMemVariantBlock
(
)
:
base
(
RawCOMHelpers
.
VariantSize
)
{
NativeMethods
.
VariantInit
(
Addr
)
;
}
public
CoTaskMemVariantBlock
(
object
obj
)
:
base
(
RawCOMHelpers
.
VariantSize
)
{
Marshal
.
GetNativeVariantForObject
(
obj
,
Addr
)
;
}
#region CoTaskMemBlock overrides
protected
override
void
Dispose
(
bool
disposing
)
{
if
(
Addr
!=
IntPtr
.
Zero
)
{
NativeMethods
.
VariantClear
(
Addr
)
;
}
base
.
Dispose
(
disposing
)
;
}
#endregion
}
internal
sealed
class
CoTaskMemVariantArgsBlock
:
CoTaskMemBlock
{
private
readonly
int
length
;
public
CoTaskMemVariantArgsBlock
(
object
[
]
args
)
:
base
(
args
.
Length
*
RawCOMHelpers
.
VariantSize
)
{
length
=
args
.
Length
;
for
(
var
index
=
0
;
index
<
length
;
index
++
)
{
Marshal
.
GetNativeVariantForObject
(
args
[
index
]
,
GetAddrInternal
(
length
-
1
-
index
)
)
;
}
}
public
IntPtr
GetAddr
(
int
index
)
{
if
(
(
index
<
0
)
||
(
index
>=
length
)
)
{
throw
new
ArgumentOutOfRangeException
(
"index"
)
;
}
if
(
Addr
==
IntPtr
.
Zero
)
{
throw
new
ObjectDisposedException
(
ToString
(
)
)
;
}
return
GetAddrInternal
(
length
-
1
-
index
)
;
}
private
IntPtr
GetAddrInternal
(
int
index
)
{
return
Addr
+
(
index
*
RawCOMHelpers
.
VariantSize
)
;
}
#region CoTaskMemBlock overrides
protected
override
void
Dispose
(
bool
disposing
)
{
if
(
Addr
!=
IntPtr
.
Zero
)
{
for
(
var
index
=
0
;
index
<
length
;
index
++
)
{
NativeMethods
.
VariantClear
(
GetAddrInternal
(
index
)
)
;
}
}
base
.
Dispose
(
disposing
)
;
}
#endregion
}
internal
sealed
class
CoTaskMemVariantArgsByRefBlock
:
CoTaskMemBlock
{
private
readonly
object
[
]
args
;
public
CoTaskMemVariantArgsByRefBlock
(
object
[
]
args
)
:
base
(
args
.
Length
*
2
*
RawCOMHelpers
.
VariantSize
)
{
this
.
args
=
args
;
for
(
var
index
=
0
;
index
<
args
.
Length
;
index
++
)
{
var
pArg
=
GetAddrInternal
(
args
.
Length
+
index
)
;
Marshal
.
GetNativeVariantForObject
(
args
[
index
]
,
pArg
)
;
var
pArgRef
=
GetAddrInternal
(
args
.
Length
-
1
-
index
)
;
NativeMethods
.
VariantInit
(
pArgRef
)
;
Marshal
.
WriteInt16
(
pArgRef
,
0
,
0x400C
/*VT_BYREF|VT_VARIANT*/
)
;
Marshal
.
WriteIntPtr
(
pArgRef
,
sizeof
(
ushort
)
*
4
,
pArg
)
;
}
}
public
IntPtr
GetAddr
(
int
index
)
{
if
(
(
index
<
0
)
||
(
index
>=
args
.
Length
)
)
{
throw
new
ArgumentOutOfRangeException
(
"index"
)
;
}
if
(
Addr
==
IntPtr
.
Zero
)
{
throw
new
ObjectDisposedException
(
ToString
(
)
)
;
}
return
GetAddrInternal
(
args
.
Length
-
1
-
index
)
;
}
private
IntPtr
GetAddrInternal
(
int
index
)
{
return
Addr
+
(
index
*
RawCOMHelpers
.
VariantSize
)
;
}
#region CoTaskMemBlock overrides
protected
override
void
Dispose
(
bool
disposing
)
{
if
(
Addr
!=
IntPtr
.
Zero
)
{
for
(
var
index
=
0
;
index
<
args
.
Length
;
index
++
)
{
var
pArg
=
GetAddrInternal
(
args
.
Length
+
index
)
;
args
[
index
]
=
Marshal
.
GetObjectForNativeVariant
(
pArg
)
;
NativeMethods
.
VariantClear
(
pArg
)
;
}
}
base
.
Dispose
(
disposing
)
;
}
#endregion
}
}
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